Turbo 8.1 on HIGH BOOST makes UNBELIEVABLE amounts of torque

The turbo big block 8.1 truck has been put together for about a year now, and its survived on 13 psi of boost for about six months, but I have never had it back on the dyno to see how much power and torque its making, so we decided a quick trip to the chassis dyno was in order. Since I went to Redshift before, I wanted to make sure I went back on the same dyno to get data on higher boost levels. Needless to say, I am very impressed with what this junkyard fresh big block
#bigblock #turbo #silverado

[@LawrenceTolman]

I badly need to get some better tires for this thing and head to a track to see what it will do with the new setup... thanks for watching guys!

[@christianmeeks4430]

If you're going with a Raylar Engineering crankshaft it would be great to see the big block get a 4.750 crank. Torque production would be insane.

[@tucksmith8300]

That truck is making a lot of power

[@crazycracker593]

100% Jealous. This series on ugly truck has made made me reconsider D-max (LBZ) swapping the my Square body Suburban. (aka Suburbasaurus Max). I may have to build 2 if them now! HaHa

[@russschwerma1246]

Can't wait to see the results at the track

[@radiolotek]

You should do an in depth video of the setup now. I have an 8.1 in a 3500 and would love a bit more power without having to swap everything in the truck. I'd be happy with the low boost numbers.

[@bradwentz4607]

I think you should disable the wastegate and give it all the boost that s480 will throw at it before you pull it that's for sure. For science and entertainment purposes of course.

[@LawrenceTolman]

that would be entertaining for sure.

[@Troupe454]

Or he could sell it to me to replace my 8.1 in my pickup that would be great 😊

[@young11984]

S480 would eject a few pieces out of the oil pan😂, entertainment equivalent of a jack in the box.....WOT and wait for something to pop out🤣

[@grantsgalaxy687]

Love the 8.1 and the 4.8 builds totally different than anything else going on

[@TheIndoGod]

I Love 4.8s That High Rpm Horsepower

[@TheBeerBox80]

I love the way this engine sounds. It is aggressive yet mild.

[@sbfguy7793]

Loud is cool, but quiet and mean is awesome

[@MrTheHillfolk]

I see them often at work, on generators. Lemme tell ya ,you can hear those cubes coming up to speed ,you can't silence that kinda throat. Alas, they start and go to 1800 ,so unless you catch the ramp up you've gotta wait until it's under a load.

[@beausmith3900]

I live in Rigby, I wish you would have had fans come to watch at redshift.... good video, excited for what's to come

[@mythod1]

Good job LT, loving this build, congrats on the dyno numbers

[@maineturbodiesel780]

I love it the more you put in your know how guess gives guidance and what to really expect makes for real respect . . Keep up the killer work can't wait for every new comparison

[@lonelybikr]

Love the way it sounds coming back down to idle. Great videos LT. I got a little nostalgic and watched your red k1500 AWD LS build.

[@GeorgiaHyway]

Totally AWESOME! I can't wait until I get my 8.1 project started! Not going anywhere near what you have done but? it's incredible of what you're done with this project so far! Keep building and I'll keep watching! Thanks LT for sharing!

[@jefferyrader5153]

Call it 750 lb ft and it's still impressive. I'm in the middle of a t56/ iron block ls1/lm7/ ls2 abomination swap on a 99 rcsb and you're videos are very helpful man!

[@jeremydoblinger3609]

All the time you've spent on TV seems to have made your camera work and style perfect. Like you know exactly what to say and how.. nice just came across your channel.. great to see ya brother

[@erichildreth7562]

Man that is a lot of torque and the Ugly Truck has to be a blast to drive!! Nice work and looking forward to seeing the 4 wheel step side conversion!! :)

[@randysullivan5723]

Taking the converter out of the equation is like taking the turbo out of the equation. Both are a part you added to increase the output . Great content in general 👍🏻

[@B1zzlesnaff]

Keep up the good work LT! I enjoy your stuff!

[@LawrenceTolman]

Thanks, will do!

[@travisgriffey1001]

Love the sound of this truck bud and the way it racks off when slowing down

[@NickTheFelice]

Awesome video! That big block is a monster stock, your new one will pretzel a driveshaft!

[@johnnystanley4469]

great content, thanks for all the tech and info, God bless

[@ricopico1010]

I agree with you LT. More than anything, Ugly Truck is overall fun. I find myself wanting to see more of this truck at the end of every video. That extra drop also make this truck look so dang good!

[@MrArrakis9]

850 ftlbs of torque at mid RPM is a absolute monster. I imagine that thing is an absolute blast to drive.

[@200shotramhemi4]

Dyno Vids with Numbers are always the Best! 💯

[@LawrenceTolman]

Glad you like them!

[@shannonsisk]

Awesome build. Love seeing the 8.1 get some love

[@LawrenceTolman]

Thanks 👍

[@johnbehneman1546]

WOW!!!! GREAT CRAFTSMANSHIP AND A GREAT BUILD!!!! A LOT OF PROJECTS AND A LOT OF FUN!!! GREAT VIDEO & THANKS FOR SHARING!!!

[@LawrenceTolman]

Glad you enjoyed it

[@tdsilverado7470]

Those are great numbers LT no matter how ya look at it, Well done.

[@adriannewman1322]

Sounds good. That turbo sounds really dam good

[@rotaxtwin]

I can believe that the truck is fun to drive, those torque numbers back that up!

[@sheridanrambo8620]

Lawrence!! I can wait to see this turbo 8.1 evolution!! I have followed from the start and this is great! I own a single cab longed 4x4 (2500HD), wich originally came with the 6.0/4L80e combo.... I swapped it to a Kodiak Topkick drive train about 10 years ago.... it now has an 8.1L/Allison 5 speed combo.... and I installed a 273xhd t-case, wich typically are found in an F550, to eliminate the GM T-case oil pump rub issue.... I still love my pickup, but I always was so curious about a set of Raylar heads and a turbo setup.... living here in CA I never pursued that endeavor considering it was difficult enough to get through the smog referee and finish with a legal pickup. .... I can't tell you how excited I am for your build! Thank you so much for the great education, and fantastic content! LT TV is for me!

[@johnsmith-qz4bv]

cant wait see the rest of the build....good numbers

[@raystevens687]

Another good job well done LT now off to the race 🏁 soon thanks Ray in Idaho

[@ValarAmstaffs]

Great video LT!

[@thepowershift]

I really like the turbo 8.1. It’s different and you have made solid power with it. Good video.

[@LawrenceTolman]

Thanks 👍

[@Irocnrollz]

Love the Cleetus hoodie !!! Keep it up LT, love the videos =)

[@yogadon68]

With that kind of torque, if it ever hooked up off the line it would point that front end to the sky.

[@deanmoberg445]

The Tq numbers are impressive! For those that do not know what that means. Basically a neck snapper, lol. Like you said LT " it is definitely fun to drive'. Keep at it! I enjoy the content!

[@scottfenner4051]

Can't believe you've doubled subscribers since I've been here!

[@tristanoliva]

I can’t wait to see the road to 1500hp for the ugly truck. I love all the wisdom and information sharing on your channel! Have a good day man.

[@walkersmith8865]

Love this project! Can’t wait for the new engine.

[@LawrenceTolman]

Me neither

[@Sabessuspensionz]

Awesome numbers, I have a 4.8 RCSB that has only a big torque converter and 4:10 gears! These young guys get suprised when I beat their cammed out 6.0s. They will be even more suprised once a throw in the snail waiting for it in my closet. Stock engine looking to throw around 12lbs at it

[@dillanhamilton]

Those Dyno numbers are crazy LT. Would love that kinda power hauling with my big block

[@MegaRgallardo]

F$&k yes my guy, love the build. Especially the sleeper look

[@jasonlovell3934]

That’s an awesome assortment of cars in the background at this shop

[@zaxpage9003]

I love the concept of taking mostly stock junk yard stuff and building monsters. I have a 74 GMC original 454 I'd love to boost.

[@_cfoster9278]

Hard to stay interested and subbed with one short video a week.

[@y5mgisi]

God love you, LT. I cant wait to drive my 8.1.

[@blueracercam20]

I would love to have Ugly Truck's setup in my Chevelle. Great video!

[@dannyflood3291]

Man you're the reason I bought an '05 2500 4x4 suburban 8.1 to turbo and pretty much mimic this build, thanks for the inspiration man keep wrenching!!

[@CITYBORNDESERTBRED]

Note he hauls this thing with another truck.. Hope you’ve got low fuel prices near you 😄

[@LawrenceTolman]

Sure thing! That would be a fun family hauler

[@dannyflood3291]

That's the plan!!

[@dannyflood3291]

The other goal is to see how much fuel mileage I can get out of the 8.1 under "normal" driving conditions

[@62saki91]

About 13 mpg...

[@Jesse-gr3jq]

I was gonna say while you were going over dyno numbers that those are very similar to a tuned lmm. Seems like I wasn’t the only one who thought so👍🏻

[@teaguegearhart9851]

Love it when we hit the dyno and talk numbers.

[@derekwilson9215]

I love it man! So I have a 14 Silverado with a 6.2 on the way is a circle d 2000 stall triple disc converter I can’t wait to see what it does to the truck!!! No dyno but I think it will be sweet! I’ll send some pics! Love the channel keep it up!!! Derek

[@LawrenceTolman]

Thanks! I love the circle D and think any truck can benefit from a good converter

[@teamgmotorsports]

Man, I was looking forward seeing some of the scenery from your trip up there:( Oh well, maybe next time;)

[@EGGINFOOLS]

Those heads are keeping it a torque monster.

[@tucksmith8300]

That truck is making really good power

[@JmanRx81]

Seeing your truck lift when you get on the throttle and then sits back down when you let off... 😍🤣

[@anomamos9095]

I live in a fairly hot climate and was constantly having to stop and let the engine cool down even just from normal driving. Adding a cold air (ram) intake and a dedicated transmission cooler solved the problems mostly and even let me turn the wick up a bit until the tired old engine didn’t want to play anymore and threw a tantrum.

[@eljosue20]

Love your content since the TV days

[@dylanwagner6055]

The aero motive stealth series pumps are drop in replacements for the gmt800 and have the option for dual pumps

[@Stinky_G04t]

Love both trucks makes me wanna fox mine. Its sittin in the drive way with built trans ams rear end and a stock 5.3.

[@Johnman3341]

Thing is an absolute beast

[@richardharvey8939]

Love the channel.

[@LawrenceTolman]

thanks!

[@Bimmerguy88]

Boy LT, I have watched EVERY SINGLE EPISODE of 'Power Nation ' AND 'Truck Tech' that you were in and I LOVED every single bit of it! :) But now??! getting to have a WHOLE CHANNEL Devoted to you and ONLY YOU and ALL YOUR Own builds?!?!! "Can life get better??!"" "I submit that it CANNOT!!!" ~ ME :D I've been hooked since Power Nation bro, I love the way YOU work, I love ALL of your builds so far! Excited to see what comes next!

[@LawrenceTolman]

Well thanks for the kind words abs for being a loyal viewer! It’s much appreciated

[@Fackler91]

Love this truck

[@codym3739]

I really like those wheels on this truck!

[@KP-w4gu]

Decent wheels, I got some for my 95 k1500 single cab stepside. Love the channel ✌🏼

[@alanquiroz5455]

What are the wheels called?

[@om617yota7]

I have a '98 one ton dually with the 454. Been looking at diesel swaps, but something like this sure would be a lot more fun.

[@user-fj3gp4dv9e]

Man I just bought a 2001 Sierra today with the 8.1. It runs and drives amazingly. I knew it was good right when I drove it. After all I’ve done major research on this motor for 100’s of minutes lol. Of course I just got a few more minutes 🎉 however I’m all those hours I’m becoming happier and happier with my decision. Still learning and still impressed with the stock performance on the one I got. Thank you sir for the information

[@CMillet86]

In my personal experience, if you lock the clutch before applying power they will rarely slip, it's when you try to lock it under high load they will slip.

[@charliecadaver666]

Thats some nice tq #'s! Guess the big block really knows how to suck 🤣🤣 I'm a LS builder, but damn that thing sounds great when you turned it up to 13# boost! Damn good! Love to see what a twin set up would do or throwing a blower on top and twin-charging the bbc!

[@shawnsecleter2453]

Nice very impressive

[@landonthompson5604]

Dude I really wish the idea's popping around in your head were used when you were on power nation, I'm going to bet that you did lobby to do these things but of course they had "better plans" in store, yeah like low and slow that you were pisssed af to not be able to run down the track. I can see that years of frustration came out like a volcano because if they would have listened to your idea this would not be the outcome. You kick ass and I love what you are doing LT.

[@jeffboyer8214]

Love the numbers. Parts are hard to get right now. 4.30 gears on ugly truck or lower. If you had my ppv caprice 2.92 gears you would have some fuel mileage & possibly a 200 mph truck . Be safe team !

[@trentdawg2832]

Those are duramax numbers dude!!!!

[@joetalley192]

Cool project! It's amazing how much money is required to go fast. You built the motor? Great! Now you get to do the entire rest of the drive line lol.

[@petersimpson1734]

Looking forward to the build, love to see some vid(s) of the Ugly Truck doing some rolling burnouts......... Looking forward to see you compete in some drag week events :)

[@csracing5512]

Rocking the Cletus McFarland hell yea brother love that jacket

[@LawrenceTolman]

It’s one of my favs.

[@teddyramirez2424]

I Love Your Channel Man! You’re the first one that came to mind for the following: Both BBC 7.4L /8.1L call spark gap at 0.060 from manufacturing and roughly 20yrs ago. Do you recommend re-gapping and to what number? * One of each a 1996 Silverado dually and 1999 C3500HD with 7.4Ls * Two 2001 C3500HD and a 2004 Sierra with 8.1Ls. I wonder if there was a bulletin out there for re-gapping these Big Block. Will regapping need any other tuning to balance mixture/ratio? Will regapping improve my emissions? Yes, I’m in Cali. The ARB is crazy out here. Oooor! Should I just leave everything as is, stock specs? Will that promote truck Longevity? Thank You for Sharing the Knowledge Big Brother.

[@Black9924v]

That cleetus hoodie is sick

[@jeblittle7999]

583. Hp on 13 lbs with an. Unlocked converter sounds about right. In therory it should make around 620 on 15lbs

[@brianallen8579]

LT, this turbo 8.1 makes me want to to throw a turbo on the 8.1 in my Super C RV….damn thing is heavy and I think a little more torque would help pull it up the hills better. Just unsure if the Allison trans/converter would survive.

[@BurninGas8.1]

Now i want a big turbo

[@knoxbros]

Whats going on man? I love the videos u drop especially this build. I had a question hoping u can help me out some. I dropped a 8.1 in my 84 c10 it runs good but when it warms up a weird Squeak sounds like a belt (I changed the belt) but it only happens when my truck temp hits 195. I can't find it help please lol oh yeah it's on yhe right side more. THANK YOU TO ALL THAT CAN HELP. KEEP DROPPING RAD VIDEOS

[@misterbulger]

Im currently doing a body on frame rwd Geo Metro build... was going to do a Ford 4.6 or 5.0 but then was looking at an LS1... but now I want to get a tape measure on this beast 🤣 may as well go huge while I have the opportunity

[@russschwerma1246]

Thing is a monster

[@akabruno1]

I'd really like to have that motor in my 89 4x4 dually crew cab square body !

[@BASTARDSINC]

Dude honestly I would leave it go lol. 850ft in an extended cab looks fun as hell. Right now before you put any more money into it it’s a very solid build. But if your looking for the limit I understand.

[@hugieflhr03]

Definitely respectable numbers to the rear wheels with a junkyard engine!

[@LawrenceTolman]

Thanks! It’s a blast to drive

[@Turbokrankenwagon]

Hey hey digging the channel. Why not for the time being, throw in a big cam to go racing with a make another 100+ hp? Also with the new engine is seems like a quite complicated build, why not keep the stock displacement ( 8.1 is a lot) and maximize air flow and rpm, and put in forged parts? Seems like that would be much more simple and less costly, and you’d still reach the goal… either way… can’t wait to see this progress

[@MicahCoy]

That power curve is textbook iron 8.1L heads on boost.

[@sock979]

I love you videos I love you builds it's very very cool hopefully I can find an lsa for myself that's not too expensive otherwise I'm probably going to go with a torque storm which I know is a totally different kind of boost than I was going for but boost is boost and my truck already does pretty much what I need it to do and I've got other toys to buy with my poor government salary. I was wondering something because I have a 2011 with the Z71 package so it's got the g80 rear diff and I've heard that they're notoriously weak and I really need four by four for what I do on the weekends but I really like the idea of all wheel drive do you have any idea if I switched all-wheel drive like you have on the 4.8 if it would be much different from four wheel drive I'm not rock crawling or anything but I get into a lot of mud and snow. Also if you think that g80 would be able to survive spirited driving with like 450 horsepower and torque to the wheels from a dig?

[@thomaslockley945]

Definitely sounds mean an pulling alot of boost sounds great

[@chevyfan82]

Nice!

[@donwalsh7521]

Congratulations on 70k subs! Was wondering what the bore and stroke will be in the new engine LT?

[@LawrenceTolman]

4.350 bore, 4.500 stroke, 535 CID or 8.76 liters

[@tinkpartlow5160]

That's with you upgrading the internals and the intake

[@LittleOldBoat]

Dam I have 2500 HD with 8.1 with an Allison I’m gonna go re-look at that truck right now!

[@brodi5367]

Never heard of 8.1s being easy to blow up, plenty around here in boats that get pushed harder than trucks.

[@chrislangdell117]

I think your torque could be fairly accurate. Richard Holdner ran a stock 8.1 with a Gen 6 cable driven throttle body using the Holly H.P. tuner batch fired because the 8.1 is half an LS. Running e85 fuel and 80 pound injectors. Summit S465 Turbo and water to air intercooler. 6.2 pounds of boost. He netted 840 ftlbs at the crank so 13 pounds of boost depending on your set up should easily push you into 1100 ftlbs at the crank. So 910 seems possible.

[@abnpthfdr2934]

583 and 904 at 13 lbs? Not too shaby, it'll just go up from there with all the other modifications that you mentioned. Now, for a comment completely unrelated to the video: I know you were looking for a specific hood for the stepside (I think the same as in the ugly truck, but nicer), I was thinking: Why don't you swap hoods, fix that one up for the stepside and put the ugly hood in the ugly truck until you get the specific one that you're looking for and even then, it probably won't be in the greatest condintion, but it would be going on the ugly truck, so it's all good!!! Just a thought when saw you opening the hood on this video. Thumbs up!!!

[@lcampm2]

KaCHow that sounds nice

[@4077661466jp]

Might want to lower the rear gear 3:55 or lower to get more useable power from turbo and is that transmission stock ? 4l80e ive heard is bit stronger,but its sweet gonna put nice smile on the face 👍

[@enriqueluevanos2740]

Good night I had a question I have a 07 gmc sierra classic 2wd and my question is if it's possible to make it all wheel drive its the 4.8 with crew cab short bed ?

[@MrJopopc]

@lawrence where do you find a wring harness? I would like to put one in a square body chevy

[@chillbillywyteboy2095]

Also let me know when ur ready to upgrade the turbo system or fuel system if u decide to sell some of it to upgrade a few of them parts are right up my alley