Great thread. Good info George!

 

Something to think about compressor size isn't as important as turbine size
With said a 6.2 Is a big flowing motor and you don't want to choke it regardless of power goal


And reason your setup only gains 21hp per psi is cause of turbo is used

 

There's a reason I highly recommend the stage 5 when dealing with the 6.2L.
It's not just exhaust wheel size that matters. The exhaust housing and AR do as well.
The 6.2L is not just .2L larger then the 6.0L. It flows a huge amount of more air then the older 6.0L.

http://www.shop.trickperformanceproducts.com/Stage-5-GM-turbo-kit-62L-GM-turbo-kit.htm

 

What Rick said....

 

interesting. Now I am wondering what other stock trucks with turbos are averaging per psi. I also averaged hp / psi dynos from NA, 4, 6, 8, 10, 12 psi. thats how i got my overall average.

Im glad byrdman and Trick posted. If I remember correctly, Byrdman had the 76mm then upgraded to a BW and gain a **** load of power with his 6.2.

 

My truck is right at 25hp to the wheels per pound of boost. It's a completely stock genIv 5.3, rated at 320hp to the crank from the factory. I didn't dyno the truck in stock form, but I'm guessing it would've put down right at 250 to the wheels. With just the turbo kit and a tune, I doubled my hp to the wheels at 10# which made right over 500... At 8 I'm making exactly 450, and that's on 91. I'm going to retune in a week with the meth I just put on, and I'm expecting to be over 500 on the same amount of boost.. 8#
These numbers are from a mustang dyno.. If that matters

 

Good flowing turbo or blower will make more power per psi then a choked up unit

With said that 70mm you have is small for cubes


Also have to realize not every so called tuner knows what they can or can't do with a combo


I've had combos that gained 29rwhp per psi

Also indication of choked up his back half mph

Set up I built last yr gains 34mph back half at 24 psi

 

i like the info im reading and seeing that i plan on doing the same thing here in the near future.

 

my 21 hp per psi is also at the tire through my 4x4 truck.

forgot to mention I am at 11/12* at WOT. I asked my tuner to make it baby soft so it would last forever lol. It jumps between 11 and 12 from a 0-120 pull

29 hp/psi is awesome! I have been consistently gaining ~20 mph in the back half from every stage of my build.

 

That's low...and shows

Back half shows how well a setup is

Back pressure shows its face...over 30mph the combo is free flowing
28-30 decently happy setup
26-27 it shows it has back pressure
Under 25 mph your choking up

Now blower setups can be compared as well...my over spun p1sc sees 23mph and it shows as I lose boost longer the pull is




And your statement of safe timing...that varies with low boost you can run more if don't have back pressure issues

I've ran 20* on 9 psi before on straight 93 on a setup that wasn't high on back pressure

A lot of factors come into play, I've had some setups at 26* timing on 93/meth on 12.5 psi trapped 130mph at 4700lbs

Also ran 20* at 24-25 psi for a full season
Well over 1000rwhp this was on pump E but same setup back halfs 34mph