CARB VS TPI? HOW TO: CARB YOUR TPI!

[@EpicScandinavian]

Put a piece of plexiglass over the front throttle body hole and point a camera and a timing light through it to see wtf is going on!

[@coothethird]

I was about to say the same.

[@headlesnorseman701]

You won’t really be able to “see” what he is talking about. It would be easier to do with a CADD simulation. That manifold is basically creating a bunch of “echoes” between cylinder pulses that really interfere with fluid flow

[@TurboJohn74]

yep, dry manifold flowing liquid fuel makes for a wild party. Glad you did, because you know several of us were asking to ourselves "what if"....

[@sparkplug1018]

Id thought of doing what he suggested with a few 2 barrels years ago, then thought why bother would be easier to just buy a 2x3 or 4x2 intake.

[@frigglebiscuit7484]

thats not really whats going on. its the GIANT nose on the front.

[@omarrfigueroa715]

Use long tube headers as an intake manifold.

[@basketballcory2]

That's the craziest idea

[@AndyFromm]

I've been suggesting this but he don't want to...

[@sparkplug1018]

Google "John Meaney quad turbo" from what I remember they needed something that flowed a ton of air for the intake, and figured well, headers flow lots of air.

[@AndyFromm]

@@sparkplug1018 that looks pretty wild

[@MB-ib5ji]

Can you imagine a set of headers hooked to the intake and coming up through the hood about a foot and a half and having two Holly's on them! Might not be Richards thing but I would give that comment to dude who put 8 turbos on the Mustang. right up his alley

[@ShawnDickens]

Clear plastic at throttle body opening and camera view through it. Light above carb to provide light inside at WOT.

[@richardholdener1727]

i should have done that

[@gothicpagan.666]

Individual lambda on each header will give a clear picture of what's going on.

[@regal105]

@@gothicpagan.666 you don’t wanna see that carnage

[@Adrianzx]

Seeing Richard excited makes me happy

[@erwinnijs1]

Gets excited. Runs one way. Remembers where the door is. Runs the other way. XD

[@Erichhh]

"Un-tuned port" 🤣

[@thebigpicture2032]

This is what happens when you have too much coffee at night. Epic attempt though!

[@zAvAvAz]

Awesome! Well the intake is not designed as a wet intake just air, then the fuel nozzle sprayers near the heads.

[@vicmccartin]

The Richard holdener rpm air gap intake. We will call it the Richard for short .

[@rustedratchetgarage6788]

What was the shorter name for Richard?

[@lucascb750]

To quote Ian Malcolm "He did it, the crazy SOB did it" lol

[@keepyourbilsteins]

The test we didn't know we needed. Excellent Richard!

[@olivierfaucher3426]

Do weber sidedrafts in place of the throttle body

[@ryantexada9269]

I want to see a carb mounted to where the throttle body would go, either horizontal or with a 90° vertical adapter

[@karlmoltzan6196]

A side draf webber mounted there is a great idea.

[@shadowopsairman1583]

Carbs are mounted horizontally due to the float bowl

[@ryantexada9269]

@@shadowopsairman1583 so? That's why I said 90° adapter

[@100amps]

Testing silliness is good, as long as it's realistic silliness. I'd like to see some silly mods or myths busted. Have you heard of any? You must have with your experience.

[@thetransformatorium7980]

I suspect fuel vaporization, or lack thereof, is the major issue here. If you really want to get crazy, try heating the bottom of the tuned port right under the carb with a heat gun. Get it nice and hot, and keep heating it while you do a pull. My hypothesis is that it will suddenly make much better power. I love your channel by the way. You have my dream job! Cheers! 😎

[@dionrau5580]

Put a weber or some SU on the front?

[@allenl9031]

I bet if you make a custom box, (plenum) to centrally locate the carb atop the runners, with no dead spots beyond the runners, you would have a decent high rise manifold. Just hack up and weld another TPI top to do it. Make it happen Richard!

[@richardholdener1727]

I was thinking a single-four barrel tunnel ram style top

[@reason2gether]

My theory is that the fuel curve at the beginning where it was rich, actually was from the tail end of the accelerator pump discharge, and not the jetting. The TPI was designed to transport airflow only and we could expect the results as shown. I would love to see you take a Smokey Ram intake and install a port injection system inside it to see the full potential of that manifold. I run one on my street vehicle and it easily beat the Vic Jr intake which was the previous best I had used. I know it has wet-flow disparity between cylinders , but not so bad as to make it a bad performance intake, just less fuel efficient. Smokey Yunick was my "Idol" when it comes to engine builders. He really knew his way around the SBC. His method of trial and error and applied experience was awesome. Thank you Richard for keeping up the tradition and for giving us the answer to the question this video presented. God Bless you my friend.

[@richardholdener1727]

the motor is a wot at the start of the dyno pull-the accelerator pump is not in action

[@reason2gether]

@@richardholdener1727 Hey Richard ! Are you sure? The secondary accelerator pump should still be discharging at that RPM even though the throttle reached Wide Open moments before. The pump doesn't discharge all its fuel immediately at W.O.T. due to hydraulics (cannot compress the liquid fuel). The pump spring continues to push the fuel diaphragm until the pump is empty. Anyway, what do you think of trying the Edelbrock SY1 Smokey Ram with port injectors? I currently have mine of the engine as I am rebuilding it.

[@LTJohn]

Can you please do a video comparing the LT one with the 350 ram jet setup?? I think that one would be a little more interesting because they are both very similar but different at the same time..

[@Mattvardaman]

I love it! When you sit around with your buddies and say things like "I wonder what would happen if you put a carb on an intake with long runners meant for efi?" Richard's out here running all the tests!

[@richardholdener1727]

we gotta do it, right!

[@Poweraddicts]

@@richardholdener1727 There is ALOT of plenum volume going on there. What if you build a sheet metal plenum just large enough to accommodate the runners, weld a divider in the center of the plenum to create a "Dual Plenum", then run the carb on that. I would think that would have to help with the fuel control. Thanks for the great vids!!

[@Erichhh]

It's a single plane intake with a huge plenum volume.

[@joefixxit]

What about just cutting the lid off and welding taller walls back on for more volume, fab up a massive throttle body, then fab up the runners into giant funnels at the top down to stock at the bottom side. Sort of a giant tunnel ram tuneport but since the volume will be so great you'd probably need plenty of boost so it didn't face plant on the bottom end.

[@b.c4066]

A properly designed plenum for the carb to feed each runner would be neat. Or even better, 4 dual delorto or dual webers and no common plenum. A sort of cross ram.

[@PaulsProTips]

Look at tge Smokey Ram!

[@frigglebiscuit7484]

thats what i was thinking when i saw those tpi tubes.

[@daviddroescher]

Put a 350cfm 2 bbl on each runner pair, or a 650cfm on each bank. Check how ballanced the fuel distribution with an IR temp gun on the headers. Willing to wager back 2 maby 4 are way not happy with front 2 rich. Spin the carb( primary to the rear)

[@Thomas63r2]

As long as you are getting jiggy with carb/efi mashups - how about a single Weber 58 IDA mounted in place of the throttle body?

[@jeremymardlin5381]

You can change the afr at different points on a Holley style carb if your metering blocks have screw in emulsion bleeds. Not necessarily easy but can be done. You rarely see it done except on max effort builds.

[@jamesdilliot4323]

What about building a smaller air box where carb goes on, might help it with distribution of fuel. I’m working on having a box made to try it on my car so I can use the injection side for nitrous. Thanks for all the help here

[@johnbeardsley2962]

This is how you figure out what works and what doesn't. I'd be curious to see if you mounted a carb adapter on the front of the tune port where the throttle body bolts up if it would work better.

[@travisabrahamson5092]

Always wanted to try 4 side draft carbs using the tpi base as a starting point. I've had a couple tpi motors, one Corvette one Trans Am and a fiero gt with Corvette tpi motors and a getrag 5 speed. All of them had their strengths and weaknesses. Tpi is awesome for a daily driver %100.

[@vinceyoung5912]

Does Bruhle ever complain that you mess up the dyno cells?

[@richardholdener1727]

ALWAYS-BUT I CLEAN WHEN I'M DONE

[@scrappy7571]

Pretty Cool! Next, try dual carbs on the TB cross fire intake, that has short runners. We used to call it the cease-fire, always towed in for a no start condition.

[@sparkplug1018]

Thats another one I thought of trying years ago, now I'm glad I didn't lol. Curious though why it doesn't work.

[@scrappy7571]

@@sparkplug1018 Many years ago, I heard of the cross fires being used with carbs. The runners are full size, and about 6 inches long. Rumours about it being based on the Smokey Ram design.

[@danieldimitri6133]

Well you can do air flow based fuel mixture on a constant velocity carburetor by profiling the metering rods. But it looks like part of your problem on the Dyno was just fuel from the accelerator pump. Yes the curve does still go rich to lean but I think the first rich dip is all accelerator pump so it's possibly not as bad as it looks in sustained running. For holley carbs, I'm sure changing air bleeds changes the whole dynamic but fluid dynamics is complicated. The air is supposed to make an emulsion which helps with response to changes. But the more air the more jet you need. I think the airflow vs pressure differential and likewise the pressure differentials make by the venturi due to airflow and the fuel flow from the venturi vacuum are all on exponential curves. How to get those curves to line up in a way to keep mixture constant? Or if they naturally work out I'm not sure. Maybe the nature of the manifold is contributing, maybe the strong pulses in a dual plane cause the fuel to over respond and its not a flow issue. Maybe a spacer helps, maybe a smaller air bleed or more fuel level helps. Actually this would be a good test day. 1 carburetor, test the fuel curve with different accelerators, different bowl levels, different air bleeds with the same target afr. Then swap manifolds or add a spacer and do it again.

[@richardholdener1727]

this was all sustained running-no accelerator pump involved

[@Cliff_Anderson]

I've read that you can tailor the a/f curve of a carb by manipulating the sizing of the jets on the emulsion tube stack. Don't some high end carbs have several jets installed where the standard casting just has holes drilled? Seems like a lot of trouble to go through, even so.

[@TwoLotus2]

Screw in air jets (correctors) on top of emulsion tubes. The racier Holleys have them. Webers have them too. Wanna richen it up at high RPM? stick in a smaller air corrector. Webers, you can fiddle with the emulsion tube hole patterns, etc. too. Not many people like Webers. They are a PITA and expensive to get right. They sound and look good though.

[@thommytheboy8420]

Using the tpi manifold as a roots blower manifold would be interesting, I would be interested to see what kind of torque it could make, an you could double the testing by running carbs on the blower and the throttle bodies and use the injectors, would be a good a/b test of the manifold with air/ fuel flowing through it and just air, under boost of course

[@bobqzzi]

This did not disappoint

[@benhowe2087]

Try a 50mm Weber DCOE in place of the throttle body. Un modified plenum. You should be able to tune the low mid and top range separately. Somewhat. Use emulsion tubes for low and bottom of mid range. Fuel mains for mid range and air correctors for top. Every change will effect the full range, but have more influence in the directed range. This will require many small changes to iron out the final jetting.

[@williamreilly8520]

I did the old fashioned way.I threw the tip stuff in the trash.I put on a stock aluminum quadrant intake.Just enough room for a shallow air cleaner and shut the hood.mine is an 85 so it has heat crossover that helps atomization. Once its warm it's just as good as tip in my opinion and much simpler.I had an 89 tpi firebird in 1990 so I'm not talking hearsay.

[@jessewait2931]

I had an old Wieand tunnel ram that i really wanted to run two old tbi trottle bodies on. Thought it would work great on the street as they dont need vacuum. Unfortunately at the time trying to use the old school ecm wasn't really a good idea as the tunability real wasnt there and the drivers would have needed to have been upgraded ect

[@sportsmansparadice42]

Hey Richard could you please make a couple morecof videos TPI L98 5.7 liter. Preferably 300 to 330 horsepower recipes that could match or even exceeds the second generation LT1 and LT4 in regards to horsepower and Torque. Thanks.

[@bsimpo18]

3:45 Waaaaabaaaaaa. Hey and Richard’s energy matches it

[@MB-ib5ji]

Not sure what video it was but just got done laughing my ass off again at your comment about how it's cold in Southern California and we have to put our long shorts on!😂

[@andyharman3022]

It would probably be unproductive to go down this rabbit hole any further, but I can't help but wondering if a pair of 4412 2-barrels centered on the two clusters of ports would help.... I've toyed with such ideas on my GMC V6.

[@ninjahawg94]

I imagine the Lingerfelter TPI Plenum would probably yield good results on this 4.3 motor. It'd give longer runner length than stock LT1 for tq production and shorter than L98 runners for better HP curve.

[@andyharman3022]

I've had the Lingenfelter Super Ram on my L98 for 28 years. It was the thing to have when it came out, but has been surpassed long ago. It lays down HARD at 5600 rpm.

[@theRVisme]

I know im late to this BUT... chevy built these to make power low with taller gears and to make longevity... an engine that turns less rpm will last longer, theoretically. They were not balanced to spin past 5k so they achieved their goal.. now on building, one would need to redo the bottom end, completely balanced and blueprinted as in my new L98, if it were wanted to take to "beating" plus, depending on desired rpm range a specific cam. Your absolutely right with these TPIs... tunnel ram is the killer, my car will last forever but won't keep picking up power due to this. Dart heads, spec cam and full Hedman exhaust system with lci runners it's impressive but don't turn in past 5k or you be let down... many have said "put a carb on it" and I believe them especially now with this video... thanks and hope it helps others. BTW my tpi L98 puts out almost 400hp and 500ftlb around 4k but falls on its face after that... let this be a lesson for you all... stock works great, modded let's you down on the tall end... put an intake and carb on em!

[@richardholdener1727]

every l98 is balanced from the factory-the make power at lower engine speeds because of the mild cam and long-runner TPI intakes. 500 lb-ft from a 350 would be a tall order

[@theRVisme]

@@richardholdener1727 over ⛶ been punched way out... idk who built this engine but it's super strong low end. I have a book of all the receipts and literature with a dyno sheet, its all just thrown in together and idk what fuel they ran to get the figures. It Doesn't spin just goes, but has rear end gurtle so I'd assume Rear end beefed with a tci trans and 23-2500 stall. All that work to leave the tpi? Idk why, other than stock appearance..has large injectors msd box with lots of internals.

[@theRVisme]

I'm gonna put an reg short intake on it with a 750 carb and see what that does for it on top.rpm band way to short for this set up

[@theRVisme]

And honestly it's not 500 ft lbs but 479.6, I stretched it a lil.. hp is 401.9

[@mikelaumaillier9271]

What about putting a spacer between the carb and the intake ? Would smooth the flow and not make a 90º turn. Thanks for all the great videos. Best Regards.

[@joerogers1364]

Just what I was thinking. He needed to try different style and thickness spacers on this.

[@theozman38]

Shorten up the plenum. IMO that should reduce the chaos in there. Maybe dual plane it too since if you do shorten the plenum slide a piece of aluminum plate in the plenum to divide it under the carburetor. IMO that should have a effect on it. Richard your a mad scientist!! Hahahaha. None but the best!! Second to none

[@wereexpertstoo3795]

I wonder if you built a divided custom adapter for the end of the runners would work.

[@Danimal2786]

I'm calling it now: "Today, we're testing what happens when you combine a JUNKYARD 4.8 LS (complete with the STOCK LS truck manifold) with a pair of side draft weber carburetors where the throttle body used to be!"

[@richardholdener1727]

think 4 barrel

[@justwannabefast546]

😜Use the entire length of the tunnel ram make a carburetor box that's at least 8 inch's tall and bolts to the front of the tunnel ram replacing the throttle body! Wacky looking but will be better 🤪

[@Mike-yq7ce]

Dual quad or offset twin 2 bbl's may improve things. Some Webers would probably work nicely

[@mikie9077]

if you used an edelbrock carb,, you can adjust the metering rods and springs for mid range.

[@daviddroescher]

Hollies version is a Power Valve. Both work on vac. min. -5in spring or valve. If your pulling 5in of vac. at WOT the carb is way too small (dyno is all WOT with poor mid range rpm not part throttle; if mid throttle then yes) I had the same thought, and then had to think about how it functioned.

[@hugieflhr03]

I never would have thought to weld a carb plate to the plenum! Awesome 👏 maybe a spacer would help level the flow?

[@geoffmooregm]

I wonder if using a TBI style injection system would work better. Because you now have a single plane, large plenum, long runner intake under a carb and it may not be getting a good signal like a dual plane would.

[@bartpang]

I would have bet money it would make a little more power. I wonder if a 1inch open hole spacer would have helped as it wouldn't be such a sharp transition into the plenum.

[@kenlukofnak6479]

Have you thought of a similar test using an lt1 manifold as a base , maybe with two carbs even?

[@Madmax.3]

the lt1 manifold is way to narrow up top for this to work as easy as it did with the tpi and i believe the purpose with this was to get the torque of the tpi but with the HP of the carb. a better test to try and get both worlds would be to see what a carbed tunnel ram would do with its longer runners or slap a super ram on it

[@joellikness2121]

You're a madman!!!! I love it though. The only way we'll know is through testing. I'm honestly disappointed in the numbers with the TPI and the Super L98 cam though, I thought it would be a little closer to the carb'd (on a regular dual plane) numbers.

[@rileydrabek6795]

Seems like an overly complicated tunnel ram, but without the power

[@vinceyoung5912]

What if you used a qjet? I think the smaller primaries might help at lower rpm

[@AndyFromm]

Replace the throttle body with a 90° adapter & carburetor

[@waikrujudovic]

that position in the center caused too much turbulence & empty air pockets for poor fuel atomization. I think making an adapter to the front throttle body & mount the carb to the adapter off a 3 & 4 inch inch tube to see what worked better. That I feel world of flattened the afr ratio to produce a better air pulse & fill the plenum better. Then work the inner plenum with air director bolted in like using a carb spacer by diverting the air signal

[@rustedratchetgarage6788]

I had a dirt track mustang guy tell me about a crazy 2bbl on top of a 5.0 efi intake the carb started and idled the car and would run up to about 2000rpm then through some switch on the linkage or something the efi kicks on and powered these huge fuel injectors and he had made some provisions for 4 stock 5.0 throttle bodies it had no drivability on efi hence the need for the 2bbl carb to idle it around it had no efi idle air valve hooked up it was basically an efi secondary system he tried running it to skate the rules of carbs only calling it a electronic regulated carb system stating the factory runs them they didnt buy it but he ran it in the unlimited group and said it was real fast keeping up or outrunning dirt mods with a dirt stock chassis

[@bobbyhillhead4205]

I wanna know what would happen if you put a turbo to to the throttle body then put a super charger to the carb

[@espenschjelderup426]

I have tuned carbs a few times, so a bit limited experience with it. I think the AFR curve for the dual plane carb look good, knowing that tuning carbs is always a compromise. If I remember correct my Weber tuning manual tells that AFR leaning with RPM is a to big air jet to the main E-tube. But it depends on the carb design what or if you can do anything to it. The AFR curves for the Weber and Solexes I have tuned was much worse. The Solex even have fixed air bleedes to the idle.

[@Truckace1]

The external runners are the problem. How bout putting four webers on the sides of the lower instead of the tube runners. Or maybe build adapters and run a cross ram with a couple of two barrels.

[@sweetroscoeful]

I've watched the video, and not surprised that the carb did MUCH worse. My working hypothesis prior to watching the video would have been simply that the ports on the TPI intake are designed for *just* airflow. You can make sharper/tighter radius corners because you don't have to worry about fuel separating from the mix, creating uneven/inconsistent A/F mixture and puddling. After watching the video, still not sure that that isn't happening, as richening it up might have caused the issue of separating/puddling to worsen, but again, not sure how this works with the collected A/F data...it does work with the lower power output. Unsure. But no surprise....MPI intakes and carb intakes can look dramatically different for GOOD reason.

[@davidharvey1756]

can you please put the injectors up top of radius on out side ? to give more cooling like carby

[@TrentGustus]

love your channel.. years ago Westech did up a rochester quadrajet for a blowthrough application on a trans am.. and recently I ran into a car with a blowthrough quadrajet.. would like to see you do a video on setting that up and the modifications made to make the quadrajet work with a turbo on top.. we're all mystified about the mods made to get this combo to work.. especially with vacuum secondaries.

[@georgemason9954]

Have the carb attached at the front of the tuned port

[@Fehrway_Engines]

Can you convert the GM Performance LT1 to carb intake for fuel injection and use an adapter like the M5lp 0505 07 Sullivan Performance Intake Throttle Body Adapter. I think it would look cool and make the best power curve! Lets find out!!!!

[@4739-g9c]

I think you should try replacing the throttle body with 2 mikuni style carburetors.

[@LizzyB123]

A local demo derby guy always runs some old single barrel on top of gm 60 degree V6s in a similar setup. I always wondered what it did to the horsepower. Guess now I know

[@Madmax.3]

i thought the tpi with aluminum heads, smaller cam, and small headers made 307 tq and 263 hp how did it lose power and tq when you went to super l98 cam and 1.5 rockers? lift should be close to the previous cam but with more duration super l98 220 220 dur. 450 450 lift 112lsa with 1.5 rockers previous tpis cam 207 212 dur. 440 457 lift 117lsa with 1.6 rockers

[@robertpatton7442]

Great effort! I'm curious if you kept using the TPI injectors but let the air in with the carburetor or just a 4 barrel throttle body in that position. Or with a 4 barrel carburetor at the normal TPI inlet, but using an elbow or something.

[@regal105]

Need 2 adapters to fit the runners and get 2 2 barrels

[@jonnyszewczuk6452]

Always wanted to weld a 4 barrel plate on a L-67 3800 lol

[@mikasantos3774]

I like to see you put like a 58 mm throttle body the big throttle body for that tune Port intake manifold

[@cstavro]

long runners are NOT the issue - it wasn't designed for a single carb. air can make sharper turns, but throws fuel out of suspension. cold runners are a giveaway that fuel is puddling. the large plenum is diluting the vacuum signal. you'd normally size a carb with 1.6xHP which is 400 cfm, and unless you epoxy the plenum you'll want to go with a smaller carb. four ITB (so the barrels are right between the runners) would be the best you can get. You need a taller carb pad and gentle rads to smooth wet flow. get out the epoxy. have fun!

[@jonathonwhite2813]

Richard i did this to a 3.1 gm v6 with coil packs. Still do on my demolition derby cars I have a video of it on my channel.

[@Madmax.3]

the dual plane carb gained 7% tq and hp when the super l98 cam was installed 280tq 277hp to 299 and 298 the tpi with small headers, small cam and alum. heads made 263hp and 307tq applying 7% would yield to 281hp 327tq for the tpi, why would the carb gain 7% but the tpi lose power with the super l98 cam?

[@richardholdener1727]

I'M LOST

[@Madmax.3]

@@richardholdener1727 the dyno graph in this vid shows with the tpi alu heads and super l98 cam making 253hp and 299 tq but from the previous vid kzbin.info/www/bejne/eXeVZnR4fpZgjs0 it showed 263hp 306 tq prior to the super l98 cam then once that cam was installed on the dual plane carb it gain 7% in both hp and tq compared to the last test which had the smaller dur. cam and iron heads so we can assume that just the cam change was worth a gain of 3%

[@Madmax.3]

@@richardholdener1727 why did the tpi pull in this vid lose power down to 253 compared to the other smaller cam which was the only change from the previous vid 263hp 306tq kzbin.info/www/bejne/eXeVZnR4fpZgjs0

[@dennypassialis5376]

Ive been wanting to get a First Intake System Yes they still make-em new on a 427-454 SBC

[@OzarksWildman]

What kind of induction/fuel system you running these days? “Oh...tuned port injection Holley 4150 750cfm double pumper with a throttle body spacer”

[@shadowopsairman1583]

Might aswell have a Quad TBI system

[@rustedratchetgarage6788]

Have a valve regulated to lean it out a 3500 a linear valve or pwm regulated valve could create an adjustable vacuum leak at the pre set rpm

[@chupposity]

I'm wondering if you mount the throttle body up top will it lose power as well?

[@richardholdener1727]

I DID THAT-IT ADDS POWER

[@chupposity]

@@richardholdener1727 Nice! How much more than the baseline TPI? I could do that to mine

[@Airwolf1971]

I knew this wasn't going to end well but there was no way in Hell I was going to miss watching you run it.

[@richardholdener1727]

I WAS GIDDY THE WHOLE TIME

[@alabamahouseflippers4480]

How will I get that under the hood of my C4 vette ?

[@dondotterer24]

Maybe a Qjet with a 2" adapter. Porting on the plenum. And changing the secondary throttle blade angle. Might be too much work than what it's worth though.

[@fascistpedant758]

I'd try eliminating the surplus plenum space behind the TB and add an open spacer under the carb.

[@futten3230]

ive had a picture of a tpi with a 4 barrel on if for years and eversins ive wondered how it would perform now i know

[@timothybayliss6680]

At about 2:23 was there a squirt of fuel out of the vent tube?

[@richardholdener1727]

just filling the bowls

[@jasonnielsen2125]

What will happen if you have the fuel injection and carb supplying fuel together at the same time, keep the TPI throttle body blocked off as you have done for this video and use the carb as a carb and as the main throttle body. I have thought of doing this many times.

[@georgemason9954]

Or better yet. Put the injectors on each air inlet on the tuned port .

[@gbsgarage]

You are a crazy-man! Dig, that you’re having fun.

[@camarogeorge4118]

what if you used the carb as a throttle body and used port injection with it?

[@craigchiddo2794]

What happens if you run it fuel injected with the carb on top

[@robertfalis9382]

Hey Richard I have a ported head, big cam, tbss ls2 In my Silverado. I’m using the adapter to bolt the early 3 bolt 78 to the tbss. How much am I giving up? X link and gold blade 90mm are expensive. Test it? Already have? $22 adapter to put a 3 bolt on a tbss. The truck coumo would really appreciate this test!

[@richardholdener1727]

THAT IS 12 HP (HE SAID WITH A GUESS)

[@TPVPRO]

I feel like that old Jurassic Park quote is perfect for that carb + TBI combo. 😆

[@andyharman3022]

"You were only interested in if you COULD do it. You never stopped to think if you SHOULD do it." It's not that epic of a failure, and sad to say, no lawyers got eaten.

[@leokarasinski4217]

Turn those tune port runner into cross ram runners but make them like 8 feet long

[@jr78racer]

Now turn the efi back on, and replace the carb with a four barrel throttle body.

[@ziptiejedi5658]

I was thinking the same thing but leave the carb and just use the injectors in the intake to clean up the air fuel ratio in each individual cylinder

[@jr78racer]

@@ziptiejedi5658 need a tps signal. I suppose you could run linkage to the stock throttle body from the carb to activate the tps.

[@ziptiejedi5658]

@@jr78racer yeah I was thinking you could probably use a cable from the carb to the TPI throttle body and use the factory TPS. I'm positive it wouldn't be worth all the work it would require to get everything to work buy I do think it could be done fairly easily

[@ziptiejedi5658]

@@jr78racer If you were running a large shot of nitrous through a plate kit under the carb. Then you could dial in the afr's using the injectors in the intake. Again overly complicated but it's definitely thinking outside the box.

[@jr78racer]

@@ziptiejedi5658 it's all worth it when we're not paying for the parts lol

[@sparkplug1018]

So heres a question, how much HP can the TPI intake system support on a NA motor? I mean could it support 550-600 NA HP?

[@richardholdener1727]

SEE THE TPI INTAKE TEST ON THE 383

[@MrZX1206]

What meds are you on? I need some. That intake idea is awesome. I'm sure TPIS loves it.