LOW BUCK LS TURBO TEST-BIG SINGLE VS SMALL TWINS

SINGLE VS RACING 7875 vs TWIN GT3582s-WHAT WORKS BEST? DO SMALL TIME TURBOS OFFER BETTER BOOST RESPONSE THAN A BIG SINGLE TURBO? WHICH TURBO SET UP MAKES MORE POWER? CHECK OUT THIS TEST WHERE I COMPARED A SINGLE 7875 GEN 2 FROM VS RACING TO A PAIR OF GT3582s FROM CXRACING. I RAN THEN AT 4 DIFFERENT BOOST LEVELS AND MONITORED BOOST AND BACK PRESSURE.

[lucasmullins]

Richard Holdener proving that not all heroes wear capes’s and also making me want to spend more money

[bestusernameevahhh]

By a show of hands, how many people now have a Disassembled LS in their shop right now because of this guy? We love you Richard. Thanks for kweping hotrodding alive.

[niknasstie]

It took intill 2021 for some bad ass enough to do this test.

[allenl]

I just read from Freiburger, that Sonny Leonard has passed away. RIP to a race engine legend.

[bert]

I would have never thought that the bigger turbo would bring bigger power in at the same lower RPM. Nice test!

[smp]

Sir I Thank you. Dude is spilling out real racecar knowledge more than any collage you will ever goto

[sanfordrhudy]

I almost pulled the trigger and order a couple GT35's.
Richard Holdener, thank you for all of the knowledge that you freely feed us!!
YOU DA MAAAAN!

[BlindBatG]

I've got to imagine turbo lag is the only thing keeping the driveline from doing an emergency eject from 700+hp in a 4500lb truck.

[drsrr]

Awesome video !!! Richard, Running twin gt3582rs, with turbo blankets and header wrap helps the spooling consistency. Being that the twins are less responsive on the 4.8. It Would be great to compare responsiveness in a twin gt35 setup in the 5.3 and 6.0 vs the gt45. These are the things that keep me up at night, Thanks again for all of the shared Knowledge.

[MrLightning]

To me it sounds like whichever kit packages better in your vehicle is the one you should choose if the right size turbo / turbos are available for your power goals. Great video!

[GregoryBirulkin]

This is one of your best comparative YouTube videos. Thank you!

[bcbloc]

So now we need this test rerun with tighter ar housings to see what happens. 🤠

[JimOrr_OK]

As a long time truck driver I’ve known about putting some heat into the turbo before a hard pull but I never had the reason explained like this. Thank you

[KreatorOfDeath]

I'm thinking more about a single turbo now after watching this. Hmmm

[heytonyman]

Great lesson in boost threshold. I suppose what a loaded dyno can’t show is the lag difference between single and twins. I suspect the lighter mass twins will come to life faster when stabbed from a 5000rpm roll, and also recover faster after a gear change in a stick car.

[button-puncher]

Another great video. Thanks! Lag makes sense. Turbine maps only start at 1.25PR, really get going at 1.5PR, and are fully spooled at 2.0PR. One of your setups is at 1.0 and the other is 1.5. GT3582's are good for 1, 000HP at 7psi. Like you said, too big for the 4.8L but perfect for a 6.0L. Better match would be Twin GT3082R turbos. They'd be good for 800HP at 7psi and 1, 110 at 15psi. Borderline too small would be twin GT3076R turbos. Good for 600HP at 7psi and 875 at 15psi. Those would be great on the street.

[tonymorris]

Twins will make similar power to a big single. The real advantage of twins is "Transient Response" usually called "lag". The ultimate test would be - make sure the exhaust housings are equivalent (same back pressure and similar spool rpm), set the dyno rpm to hold peak-torque-rpm, run the engine at that speed with light throttle, nail the throttle and record the boost response vs time at constant engine speed.

[Bjetjoe]

Would like to have seen a comparison of the back pressure vs boost for both configurations. Also running each combination to its maximum boost/power would also be a good comparison.

[Drekoushranada]

I'm looking forward to setting up my system. Your videos been beyond educational!

[dbjunior]

Now lets see a compound turbo setup compared to the dual turbo setup