This is running 12.36psi with a 2.62" pulley and 17 degrees advanced timing. For those wondering about the 2.62" pulley making 12psi, keep reading. For those wondering what that red run is, that is my first run with the standard Vortech system with the Vortech tune. We ended up getting 260rwhp out of the standard kit eventually. You can hunt for some of my older posts to find more info on that.




Today I tried two pulleys on the dyno, one right after another. The first was the 2.87" and the second was the 2.62". Generally, the 2.87 is thought to make 12psi, and the 2.62 is thought to make 14psi. However, I am seemingly the first person with an s197 v6 to actually run that 2.62" pulley.

After a lot of testing, it turns out that the 2.62" pulley also makes 12psi. There was no slip on the belt or anything (threw in a Gator belt yesterday). The interesting part is, it makes the boost much more quickly. We did the calculations, and the 2.62" pulley is not spinning the blower to the maximum rate, so it is something else holding the blower back. The tuner said that he feels like it is the fact that I am running stock headers. However, it is also possible it is the crappy design of the Vortech intake doing it. He thinks that it is most likely the headers holding me back though, and that the car could easily pick up a lot of power with LTs and no cats.

Here are the boost curves. The one on the bottom is the 2.82" and the one above is the 2.62". I didnt show the entire dyno because the 2.62" tune was not optimized when we printed this out. The car ended up netting and average of 30rwhp more. The top end power was totally the same, all low end power added.




Also, for those who dont know, I am running a custom Spearco intercooler on my Vortech. A lot of people have been wondering how efficient it is...
Everybody was really amazed how well the Spearco intercooler setup I had performed. It was 66 degrees today (check my dyno). The IAT with the 2.87" pulley was 70 degrees @ WOT @12psi. The IAT with the 2.62" pulley was 77 degrees @ WOT @12psi. With my current setup, that nets me ~11 degrees above ambient temperature!

 

Nice numbers!!

 

Pictures!

 

of what? lol

 

Nice numbers man! BTW, don't let your tuner talk you into exhaust mods- even with your V6 I don't think they'll be worth it. The limiting factor on the lack of additional boost is your intake- changing the Vortech setup will help as well as changing t-bodies but I don't know what's available along those lines for your motor.

Again though, congrats!

 

Very nice - that'll be a great sleeper as alot of folks will just think its a regular old V6 until you show them your taillights!!!

 

Thanks for the heads up man. I trust this tuner a lot, but I will be sure to just try the intake first. I actually have a TB on the car already. LT headers are expencive

 

Pictures of the engine bay. Like to see how it fit.

 

This is my bay about 2 months ago. Visibly, the only difference is the new bypass valve, which looks the same, but is blue.

 

Sweet!!!!!

 

thanks man, that is what I said when I got her back

 

stock internals?

 

SICK !! Nice GT spanker you have there !!

 

nice numbers!

 

thanks all!

yup

 

What changes did you make to get from the stock kit making 260rwhp to 330rwhp!?

 

The base kit is 8psi with no form of cooling. My kit now is 12psi with an air-air intercooler. I also did a few smaller things like the throttle body and exhaust. Those two netted tops 20rwhp. (I have an auto)

With a bit more exhaust and intake work, I will probably hit 350

 

very nice! Thanks for the explanation.

 

thats so bad! i love that! i want to do this! if you dont mind could you pm the cost of this? idk if u want it public. and where you got it done at?

 

I will post the costs, I am fine with my addiction lol...

just the power stuff...
3200 + 800 Standard Vortech kit
600 + 1000 Spearco Intercooler
100 Vortech 2.62" Pulley
250 Zabteck TB
400 Corsa Mufflers
550 + 100 JBA H Pipe Kit
160 Hyperboost HXc BPV
60 JBA 9mm Power Cables

However, you could probably pull off similar numbers with:
H/O Vortech Kit
Vortech 2.87" Pulley
Any 2.5" true dual exhaust kit and good mufflers, not GT take offs lol


The 2.62" pulley will make the boost more quickly (read the post), but the 2.87" pulley will also make 12psi. It just wont make the power as quickly. Also, it is maybe not a great idea to run it with the H/O cooler kit, as it is not as efficient as my custom Spearco one. Nobody has tried it with the H/O cooler though, so I cant say anything as if it was a fact with the other system. I was expecting the 2.62" pulley to make 14psi, so I upgraded to the HXc BPV, but it was basically a useless upgrade, as the stock one works to 12psi....but it does sound really cool haha. The JBA Power Cables are really for safety, apparently some people have found some gains with them, but I dont really believe that they are attributing much power. The throttle body probably makes about 2-5rwhp, it is mainly for throttle response. Any V6 can make similar numbers to what I have above with just the few mods I listed above. I also have a auto, so I am losing a ton of power from that lol.

With a AFM or JLT intake that is coming out soon, and a set of long tube headers, it is very possible to make 360-380rwhp.