I've been searching through the forum trying to find someone who is running over 500bhp with the SlowBoy Racing GT35R Kit; the one with the cast manifold and o2 housing.

Found a couple of people who are running low 20psi boost @ around 430bhp but no-one higher than that? Seems strange buying such a large turbo to run such low boost?

 

That's the kit I'm considering getting, so I'd for sure like to see some 26-29 psi boost figures..

& 35psi on race gas figures would be nice too.

 

Those turbo like to make real power above 28 PSI. Their manifold and Cast O2 Housing is the only real thing determining thier "kit". I have seen the manifold and housing and it will definately flow big. As soon as people start cranking the boost up you will see big number, stil a bit less then the ram horn manifold guys, but big power.

 

500bhp is nothing - not sure why you'd ask for that. No one here has tested themselves on an engine dyno. You need to only worry about wheel HP, since that's what we can actually measure on a dyno. 500whp on a GT35 is nothing special - people do that all the time. 600whp is the measure of excellence.

 

Agreed, but i thought i would have more chance of finding someone with 500whp rather than 600whp .... the highest i've seen posted on the forum is only 430whp.


Surely someone else other than just me has tried over 27psi with this kit??

 

You didn't say 500whp, though, you said 500bhp, which is closer to 400whp. Plus, you can't just take WHP in a vaccuum - you have to specify the dyno type. If that was 430whp on a Mustang Dyno or Dyno Dynamics, then that's probably much more power than 430whp on a Dynojet. And anyone doing 430whp on a GT35 is probably only on pump gas, but that turbo is meant to be at 30psi or higher on race gas, or at least meth.

 

do you have this kit now? if so, turn the boost up to 33 psi, im sure you will see over 500 bhp.

 

The runs were made on a Dyno Dynamics - the 430 figure was estimated at the flywheel - so do you guys call that bhp or whp?? At the tires it was 340 given transmission loss etc.

Fuel is 98octane Shell.

We could not run any higher than 27psi due to inlet temperatures soaring and the fueling going really rich

 

Heres a graph ..

As you can see the problems start at 24psi ... this is one of the best runs at the end of the day after we turned target boost down in the 4600 - 5500rpm range to minimise surge.

There was no difference in power output from 24psi to 27psi because of the temperature issues we were encountering.

The graph shows bhp and boost curves.

The pink lines are the SBR GT35R Kit.
The green lines my old setup - a ball bearing converted OEM Evo6 turbo.

Everything ran great until we fitted the GT35R, as you can see by the great performance from the old setup.

 

something other the kit itself is not right. i ran 27 psi on 110 oct with a 11:1-11:5 (max) afr and my graph was smooth as hell. put down 441 awhp. this was on a pump gas flash using a safc2 to lean it to the 11:5 afr for the 110 oct. my car currently will trap 122+ with 2.xx 60's at 27 psi. you should see a difference in power from 24-27 no matter what imo. im no tuner tho, just my .02

 

Dont you think you should be running more than 441whp @ 27psi?? (its only 7whp more than me)

I was expecting around 500whp @ 27psi, thats what two guys i know are getting on the AMS GT35R kits.


Thanks for your input, all helps me figure out the problem. What cams do you have in there?

 

Damm - who made that flash?

 

^ this guy I know, he has a thing for the number 8.

Scorke

 

scorke, your 8 up man!

 

You won't see 500whp on a Dyno Dynamics at 27psi. Most U.S. residents quote Dynojet numbers, which run about 15% higher than a Dyno Dynamics. Trying to compare your numbers equally with Dynojet numbers is a one-way ticket to confusion.

Also, you mentioned Shell 98 octane. Is that 98 RON pump fuel?