JUNKYARD 4.8L TURBO CAM TEST-DOES EVERY CAM WORK!

[@donnelhuddleston2478]

One of my very Favorite Channels, that I watch on the regular.

[@GFPRACING]

Refrigerated intercoolers As the term implies, these are intercoolers that are cooled or refrigerated in some away, and while most commonly used methods produce large decreases in the intake air temperature, these methods are with one exception only effective for very short periods, such as the time it takes to run a drag race. Generally, though, short-term cooling methods include adding ice to the coolant in air-to-water intercoolers, or spraying water, CO2, or pure antifreeze over the cores of air-to-air intercoolers. How well (or otherwise) these methods work depends on the surface area of the core, the location of the core, and of course, the volume and flow rate of the substance being sprayed over the core. Nonetheless, one method of refrigerating an intercooler over extended periods makes use of the air conditioning system. In practice, these systems divert about 50% of the A/C systems’ cooling capacity to a sealed container that encloses the intercooler. Depending on how the system is configured, the A/C system can provide cooled air to the intercooler from first start-up, or it can supply cooled air only on demand. In both set-ups though, these systems are designed to disengage the A/C compressor’s clutch above a predefined engine speed, and/or under WOT conditions to prevent damage to the compressor. As a practical matter, this type of refrigerated intercooler can produce, and maintain intake air temperatures that are well below the ambient air temperature over extended periods, but their biggest disadvantages are their high cost and complexity, since they amount to virtually a second A/C system.

[@timothybayliss6680]

I have done the math on this and it works, you need a huge vapour compression system though. It takes quite a bit of power to drive the refrigeration but consistently the engine will produce more power at the cost of fuel efficiency. What you almost have to do is have an isolated coolant loop and two stage heat exchange. Your first exchange is to ambient liquid or air and remove as much heat as possible and second through the refrigerated cycle. It's horribly complicated and heavy but it is possible. There is a reason why guys at the drags use bags of ice in a tank and just add more ice each run. Even long term it's probably cheaper than a mechanical refrigeration cycle when you are only running 8 seconds at a time. For endurance racers, the weight and efficiency come and kill it from the other end. When you have a limit on fuel tank size, maybe fuel consumed in the race and you add pounds, it stops this idea in its tracks.

[@Hogiewan1]

I truly enjoy your videos. Thank you! I remember way back when I was a teenager struggling to pick a can for a 355 SBC I was building for my 1955 Chevy. I went with a Crane split duration 584/592 with I think 114 LSA. People said I was nuts, but it ran great with some tweaked camel hump heads. Lol, the good old days. Thanks again

[@xaviersimmons1843]

Just what I needed to see im thinking about putting a 6.0 cam I'm my 4.8 or just running my stock cam I already put ring gap, head studs, ported the heads and put new springs thanks a lot Rich

[@shadowopsairman1583]

Easiest and cheapest way of adding a more aggressive cam.

[@jackbilger6858]

Channel idea: Show us the power differences b/w various gradients from E50 to E100, with and w/o the intercooler, adjusting the timing as needed or a flex fuel sensor to automatically handle the interpolation b/w gas and alcohol timing tables. Many times I've heard that E50-60 makes the most power; yet, people are complaining how winterized E85 is as low as E50. And living in the hot desert, I'd like to get rid of my air-to-air FMIC for lower temps, better A/C, etc.

[@Brock_Landers]

Damn son! 650 HP 569 lb ft out of a 4.8L at ONLY 7.1 psi!? Those are some REALLY good numbers from such a small displacement V8! I am legitimately impressed!

[@dilsher12]

Afr heads doing the magic

[@austindoud273]

All the flow

[@austindoud273]

Tbf you should take 100 hp off that for in a chassis drivetrain loss and accessories so 550-500 at 7psi seems about right

[@sanfordrhudy774]

I went with the Summit 8719(turbo cam?) for my 4.8L. Working on the harness right now....until the bell rang. Time for a Richard Holdener video!!

[@tristanmerrick926]

Good advice! I’ve been trying to pick a cam shaft for my 4.8 and you’ve just convinced me stage 1 drop in summit 8712 👌

[@Turbogto_guy]

I have the stage one summit ghost cam. 222/233 in my 5.3 that’s turbocharged. I haven’t ran the car at the track yet but I expect it to go low 10’s at 138+ mph. The cam works very well. Drives like stock. Pulls to 7000. Idles at 650 pulls 13” vacuum.

[@richardholdener1727]

SMALL IS THE NEW BIG WITH A 4.8L

[@markbuskens6070]

Good stuff,I always watch each new one then watch the other ones again. I bought a 2000 Chevy 1500 that a tree fell on with the 5.3 only has 103k miles on it. Saving ideas for the turbo part 👍👍🥴

[@razors4us]

I havent missed a video in months! So glad I subscribed!

[@kennethrand1032]

One of my friends who used to work at isky told me that the blower cams and turbo cams were made to relieve some excessive cylinder pressures mainly on the exhaust side stroke. I suppose it also helps with excessive wear on components also sometimes make more peak power.

[@johnparrish9215]

I would love to see a comparison between cams with 108 VS 112 lsa under boost. I'm mostly wondering about the exhaust temps and pressures.

[@timothybayliss6680]

That would be interesting. There is a video with three cams 108 112 and 120lsa with the same lobes. It wasn't done with turbo or blower. That is a ton of dyno time though.

[@interceptor0166]

Usually the drag cars run a 108 lsa. Like when Richard tested it vs 112 lsa etc. The 108 made more power. This is good information, but you need to pick a cam based on each individual application. Many cans cover many applications, but one size doesn't fit all. A 4.8 likes a smaller cam, a 6.0 can go larger. I had sbc 400, 500 lift, 235 duration @.050. 108 lsa, 3500 stall. Never dyno tested, but it ran great in a street car. Daily driver.

[@MrScottt28]

The turbo does what the turbo does.

[@duanehamn6996]

I really like for you to talk about average power under the curve for daily street driven turbo engines. Also off road combinations with high torque right off idle.

[@timothybayliss6680]

Off-road like rock climbing or off-road like prerunner?

[@duanehamn6996]

I had in mind rock crawling type wheeling where a smooth transition to increased power helps offset larger tires and heavier drive train.

[@timothybayliss6680]

@@duanehamn6996 ya, I would watch that. An ls with a torque cam and an m122 blower if you really need it.

[@justinmalbrough3754]

Good information! I’ve personally have run a comp. xr281 cam in 5.3 for 4 yrs now. Running na and under boost it always gets compliments on the sound. But next time I agree a little smaller cam would do better!

[@Wrenchen-with-Darren]

Great video. Would not have guessed a 4.8 would make 1200hp so easy.

[@nowayjose596]

The real question I haven't seen answered is how will a BTR Stage 2 Turbo cam compare to a BTR Stage 2 N/A cam? I know each of them will perform well but will the turbo cam perform *better* under boost? Then take it a step further and compare their Stage 2 Twin Turbo cam.

[@richardholdener1727]

whatever they do na-they will do under boost

[@CobosDoesItAll]

@@richardholdener1727 if I wanted to put a ls6 cam in my 4.8, do I just order a factory ls6 cam or do I needs springs and stuff too?

[@nowayjose596]

@@richardholdener1727 Then that means even turbo cams from reputable companies like Brian Tooley are more hype than substance b/c I'm pretty sure their N/A cams will outperform their turbo cams naturally aspirated.

[@Turbogto_guy]

I had the btr stage 2 (non turbo) cam in my ls1. I did not like it and pulled it out and put a summit stage 1 ghost cam. I could never get the btr cam to idle reliably and it was real soft in the midrange. I just did not like that cam at all. I put the stage 1 summit cam in and all my issues went away, pulled better in the midrange, drives better and pulls about the same rpm. Just my experience.

[@shadowopsairman1583]

Its about the values, not the name

[@dannycalley7777]

R.H. ..............that survey yesterday, was it research for Mrs. Hs . class project ??????? all ways thumbs Up !!!!!!!!!

[@richardholdener1727]

which survey

[@frankiethomas1776]

I’ve always wondered about twin charged motors and if twin charging an LS motor would be worth the time and effort. Just a video idea TWIN CHARGED junkyard 5.3!!

[@timothybayliss6680]

It's not. The power to drive the blower is oppressive. Even to spin a m122 on a 5.4l ford takes over 100hp. It will make more peak power and torque with just turbos, and more torque everywhere above 4000rpm.

[@SoulTouchMusic93]

The reason to twin charge is to get rid of some turbo Lagg. So unless you're over 1200 hp don't bother.

[@americanfamiliesfirst2790]

Richard, most are not going to upgrade their heads until the very end of their build. Good reliable ls heads are going to cost you $2000 to $2500 or more, unless you buy a bare set.

[@WVXL64]

Every cam is a turbo cam? What happens when you have bigger overlap numbers? Say a cam in the 240/250 @.050 duration split on a 106lsa?

[@mikelittle9583]

Great videos Richard. Keep it up. I watch em all!

[@Mattvardaman]

4.8, add cam and boost, then have fun!

[@Bull761]

what effect would backpressure from a 'legal' exhaust system have on the charts? I'm guessing it would knock some off the top end and proabaly make the cams with less overlap/wider LSA preferable?

[@richardholdener1727]

IT WILL REDUCE POWER UNDER BOOST MUCH MORE THAN NA

[@adamcrossman3507]

LOVE watching that big bang 4.8 make 1200+ I happened to notice twin turbos on it, why twins? Asking because I just watched the video discussing twins and singles. If I take my stock 4.8, do the "razor blade rebuild", add ring gap, 102mm tb, tbss intake, stage 2 cam and springs and the obvious other stuff like injectors fuel pump etc. But keep the stock 862 heads (fully knowing that's most likely my limiting factor) , could I make at least 1k? Single GT45 or twins? Is home porting an option without a machine shop? Is the shape of the port as important as the size of the airway?

[@Wrenchen-with-Darren]

Just my opinion...port for smooth pathway not for larger path. Easier and safer. But, it's all in the turbo. One will do.

[@richardholdener1727]

4.8L with twin GT45s, cam and springs is easy 1000 hp-easy 1200 hp-the heads will not hold you back

[@adamcrossman3507]

@@richardholdener1727 great to hear! Is twin necessary? I'd like to avoid doubling all the plumbing waste gates etc if I don't need to.

[@00infernoGT]

I wish you would do a full on, all out 4.8 dyno video. Im putting together possibly one of the most powerful SBE 4.8s in existence and would be cool to see someone else do it too. 235/24x cam, proflo intake, S491 turbo... 8600rpm type stuff. we expect to see over 1600whp at the flywheel

[@richardholdener1727]

MUST BE FORGED INTERNALS

[@00infernoGT]

@@richardholdener1727 no sir.

[@Sir.VicsMasher]

Intake manifold test for LT engines would be interesting, I heard the gains are very small.

[@timothybayliss6680]

The Lt2 is supposed to be the best. The L83 is a smaller port. The l86 and L8t have the same port size as the lt1 but are geared for torque. The most difference I have seen between an lt1 and L8t intakes is 12 crank hp on a 600hp build. The L83 is supposed to be a bit of a restriction even on stock trucks but I doubt that.

[@nfwsrt8zl12]

Love it every cam is a turbo cam I have a 2019 6.2 truck 11.5 to 1 compression what power do you think about 8 pounds of boost

[@richardholdener1727]

na hp x 1.6 approx

[@mrmatt2525able]

Love the videos. Merry Christmas

[@TheProchargedmopar]

Man, that torque cam dyno pull I thought you were running on the salt flats......

[@AGS410]

I would love to see a stock 4.8 ring gapped, stock heads with LS6 springs with a Howard rattler 226/234 525/525 at 109 lsa A victor jr single plane with a 850 demon blow through with a gt45 turbo! I think it would do pretty good and sound nasty!

[@Mastermindyoung14]

but wouldn't the added bottom end of a torque cam spool the turbo faster, giving you a much fatter curve?

[@richardholdener1727]

IT COULD

[@hollowell427]

What does a tight LSA do to a turbo charged application. Say like a 103 to a 108 LSA. Can you actually go too tight on the cams LSA on a turbo application?

[@richardholdener1727]

IT IS NOT IDEAL

[@grants.9120]

Every cam is a turbo cam. Just like every book is childrens book if the kid can read

[@samsturbo]

Great channel...lots of info. ... Have you considered running a turbo cam vs other NA cams back to back on the same motor, and to see the graph difference. Thanks again

[@richardholdener1727]

Yes I have

[@samsturbo]

@@richardholdener1727 I do appreciate your reply ..... BTW do you happen to recall in which video title you did the comparison?

[@Phil-rs5wl]

Have you done any tests with decapped injectors? I think that's what I'm going to try for mine, at first at least.

[@donellmuniz590]

Hello again. I'm puzzled by this back pressure in a turbo. If you have back pressure in a normal exhaust system, you install a bigger pipe and/or muffler. If there's back pressure in a turbo, 1) Is there any benefit to that? 2) Wouldn't that just make the turbine spin faster? 3) If backpressure IS bad, wouldn't a bigger turbo fix it? I just don't get it.

[@Phil-rs5wl]

The back pressure will start to fight the turbo and will also try to push open your wastegate. It's not great for the engine to have a ton of back pressure either. You don't necessarily need a bigger turbo, you can increase the size of the exhaust side of it without having to change the entire turbo.

[@timothybayliss6680]

The back pressure of the turbine is kind of misleading. You need a pressure drop across the turbine section to use the energy to drive the compressor. If you have 20psi backpressure before the turbo but have 6psi backpressure after the turbo, you only have 14psi across the turbine but it's even worse than that because it changes the pressure ratio. From 20psi to 0psi is (20+14.7)/14.7, about 2.35. If you have 6psi after the turbo it's (20+14.7)/(14.7+6), about 1.68. This cuts half the energy available to drive the compressor. At a pressure ratio of 1, there is no flow. Backpressure after the turbine will stop you cold. The thing that is the holy grail of turbine drive pressure is nozzle area. That is determined by A/R and turbine inducer. The bigger you make both.of those, the lower the drive pressure. If you had a gt35 (68mm inducer) with a 1.06 AR housing and a t4 p trim (74mm inducer) with a 0.96 AR housing, the nozzle and really the turbine in general is almost the same and would have almost identical back pressure.

[@richardholdener1727]

how would you have 6 psi of back pressure after the turbo? that would be a pretty restrictive exhaust

[@timothybayliss6680]

@@richardholdener1727 maybe. Lots of cars and even more trucks with a single exhaust are in this range though. www.aa1car.com/library/exhaust_backpressure.htm Their testing shows most cars with a stock exhaust in good shape are between 4 and 8psi at 4000rpm. When you start trying to shove 1000hp worth of exhaust out the pipe things get a little more complicated, even the size of the tube can become a restriction in and of itself. When Gale Banks was testing a 852hp diesel, the 4" tailpipe was 2.3psi of restriction without a muffler. kzbin.info/www/bejne/e2nWnmOZlNCGnpo It would be difficult for me to believe that even the best 3" twin exhaust with mufflers on it wouldn't be more of a restriction than an open 4" pipe. If you want catalysts or for it even to be reasonably quiet the backpressure will be substantial. I read the article you wrote on it and it's really good. It made me wonder how quiet a 3" exhaust with strait through mufflers are. This dude kzbin.info/www/bejne/m561hJx7aM-okLM Has a stock c5 exhaust with boost and has almost 15psi of backpressure at 6500rpm. He has to retain cats for legal and doesn't like going deaf on every drive. There will be lots of guys that have backpressure that high and not realise it.

[@donellmuniz590]

@@timothybayliss6680 That was waaay too technical for me. I don't know half those terms, and I dont do math 🤣.

[@natelsx]

The cam I run is 236/246 on a 109 . How would that do with turbos being on a 109 ? Would love to see a dyno session of testing that.

[@richardholdener1727]

WHATEVER POWER CURVE IT MAKES NA -IT WILL DO THE SAME THING UNDER BOOST. GOOD OR BAD, BOOST JUST MULTIPLIES WHAT IS THERE

[@natelsx]

@@richardholdener1727 I understand that. I was curious if the lower lsa would have any effect on the boost. Thanks for the reply !

[@thisisyourcaptainspeaking2259]

All except a flat cam. ;) I wouldn't think much overlap is needed, less is better?.

[@timothybayliss6680]

It's a weird thing that happens. When you have a properly sized turbo, boost is usually higher than backpressure until about peak torque. When you reduce the overlap you can add some power up top but it actually makes the engine really lazy down low and really hurts spool. When they were developing the Buick v6 stuff for drag racing they usually had an LSA of 108-111 and even though it didn't make the power at the top end compared to an LSA of 116, the car would leave harder and spooled quicker and was ultimately faster. That's drag racing, on the street it would be even more noticable. The combination with that huge s480 on a 4.8l, you will want as much torque as possible just to try to light the big guy up.

[@thisisyourcaptainspeaking2259]

@@timothybayliss6680 So overlap is better at lower RPM range (where most of us more than likely will be most of the time), thanks. I assume this is the case for both the early carbed and later Sequential EFI version 231s in the Grand National.

[@richardholdener1727]

what the cam does na-it does under boost-if it make more low-speed na power-it will spool the turbo quicker

[@thisisyourcaptainspeaking2259]

@@richardholdener1727 I'm a fan of low end grunt and taller gears, I freak at spinning anything over 6k and by 5 I'm gritting my teeth. LOL

[@timothybayliss6680]

@@thisisyourcaptainspeaking2259 if you look at the specs for what btr has on their truck torque cam it give a good example. They have 202/202 duration .507/.507 lift(I have also seen .511 lift) and 111°LSA with 1° advance. The tight separation might make it noticeable at idle but BTR says it works with stock converters and according to their testing makes more torque at every rpm from 2500-6000. One of the tightest LSA on a factory cam is the 2000 model year LS1 at 115.5°. If you had that cam, I probably wouldn't swap it for the BTR torque cam. It's not enough of a change to justify the investment. For a Factory 4.8l it's a pretty healthy cam for a truck.

[@russelljackson7034]

Right on

[@interceptor0166]

Man. The stock cam with the turbo at 523ish hp is more than adequate for a daily.

[@rob9176]

Hi Richard I have an off topic question. The old hot rodders use to run staggered length velocity stacks on their carbs, I was wondering if you had ever tested the effects of this and if so what happened

[@richardholdener1727]

I DID TRY THAT ON THE 500 CFM CARB ON THE 292

[@rob9176]

@@richardholdener1727 I meant when they ran like four twins or eight singles

[@9thgatedim273]

Hey rich whats a good turbo set up for a 3rd gen 4.8 stock bottom end looking to spice my 55 up

[@richardholdener1727]

I don't know kits for exact chassis fitment, but let me know what power you want and I can suggest (Gt45 for up to 700 hp, S475 for up to 1000 hp)

[@hallz9117]

I have a 369 fsb 4.155 bore ... 9.2 compression ... what size turbo, and what octane fuel/pump gas ?

[@richardholdener1727]

CAM? HEADS? POWER NEEDS?

[@hallz9117]

@@richardholdener1727 I'll get back to ya tomorrow with info

[@mannyinstallseverything1082]

Were is the big bang k swap waitin on that curious

[@richardholdener1727]

COMING

[@azza9575]

Why do so many cam makers list specifically turbo cams

[@drivewaybuild280z6]

What turbo would be the most suited for this 4.8. I have a 6766 precision capable of 1000hp. Would it work for this 4.8 with stage 2 turbo cam.

[@richardholdener1727]

a 67 capable of 1000 hp on a 4.8l?

[@drivewaybuild280z6]

Well it’s rated for 950hp I’m just rounding it up.

[@madvtecyo546]

In general do you think water to air is better than air to air?

[@richardholdener1727]

IN ITS ULTIMATE FORM WITH ICE WATER -YES

[@shadowopsairman1583]

Values really. Also Heads

[@richardholdener1727]

VALUES?

[@sled1racer]

are there cam characteristics that are better utilized in a turbo application?

[@richardholdener1727]

YES-BUT HOW MUCH BETTER?

[@sled1racer]

@@richardholdener1727 thats why we watch your vids to learn from a Jedi Master ;-)

[@jonathanflatbush9502]

Would this work for superchargers as well with likewise results?

[@richardholdener1727]

YES-I WOULD PICK AN NA CAM FOR A BLOWER APPLICATION

[@nashvilleoutlaw]

What happened to the 4.3L?

[@TrakSpock1]

Where my L99 at? Santa called and he said more L99.

[@hom240]

Richard! Did you ever think you would see the day that you could make 1000 plus hp on a stock bottom end without turning it into a toss salad?

[@richardholdener1727]

IT IS AMAZING

[@kristianmichels5649]

So I understand every cam is a turbo cam. But is every cam a blower cam?

[@richardholdener1727]

yes

[@mandoa.9052]

Hey Richard, i did a 4.8 LS swap on my 87c10 , I added a Stage 2 cam from summit, LS 7 springs, new lifters, billet timing chain and melling high pressure high flow oil pump, My question is, What turbo do you recommend for my set up?

[@richardholdener1727]

what power level? GT45=700, S475=1000

[@mandoa.9052]

700 hp is enough, this truck I’m putting together is a weekend cruiser

[@jonathanduke8295]

How is the nova

[@richardholdener1727]

NOVALISIOUS

[@laned8418]

So is there any reason to not run a large .600+ lift cam on a pump gas turbo ls?

[@richardholdener1727]

THE LIFT DOESN'T DETERMINE THE "BIGGNESS" OF THE CAM-THAT IS DURATION. A .600-LIFT CAM WITH 190 DEGREES OF INTAKE DURATION IS STILL A NEAR STOCK CAM

[@laned8418]

@@richardholdener1727 Thanks Richard.

[@hfmonster9981]

Hey Richard can I ask you a question?

[@hfmonster9981]

I ordered a 6-71 kit from speedmaster for a ls motor what kind of lead time am I looking at as I get no response from them on a ship date.

[@Turbogto_guy]

Smh. How would he know?

[@richardholdener1727]

I know less than you about any order you made

[@sethrogin7678]

Data already done by manufacturers

[@MrScottt28]

LET THERE BE BOOOOST!!

[@Turbokrankenwagon]

It’s funny to hear turbo V8 guys call a 4.8 small and worry about lag. Import guys have been dealing with that forever.... just cam it, turn up the boost and let’er eat.

[@johnwehunt4305]

It's So Simple!😀

[@ardelljenks6579]

👍

[@unclesquirrel6951]

Personally I blame squirrels

[@donellmuniz590]

Keep this up, and they'll be putting squirrels on your tombstone someday.

[@unclesquirrel6951]

@@donellmuniz590 🐿🐿

[@rxs20]

Straighten the shelves in the bookcase!

[@bgomusicco]

Every turbo is a cam turbo.

[@richardholdener1727]

YES-TURBOS ARE JUST HERE TO PARTY!

[@ejrperez05]

How do I buy one of your engines?

[@richardholdener1727]

I DON'T BUILD THEM FOR SALE.....JUST TESTING. BUT MAYBE......

[@ejrperez05]

@@richardholdener1727 well I'm interested if you do, either way really enjoy your content!

[@oldscut84]

All tests should have been done with the same intake, turbo and boost # . I can't compare

[@richardholdener1727]

NO NEED TO COMPARE THESE CAMS AGAINST EACH OTHER-PICK A CAM AND ADD BOOST

[@Phil-rs5wl]

Wrong cams!!😂😂

[@richardholdener1727]

every one

[@413x398]

Downvote from the guy who just paid 100 bucks extra to a custom cam "guru" for his Super Secret Agent Turbo grind.

[@krakhedd]

Show us a true cam shootout - back-to-back runs on the same engine, heads, same dyno, same turbo, electronic boost control - true apples to apples

[@richardholdener1727]

You missed the point-think na power then add boost to any cam

[@TheProchargedmopar]

👍