just had my ZZP 2.9 pulley and ZZP heat exchanger installed and wow what a difference over the stage kit. The car runs cooler and the blower and coolant hoses are practially cold to the touch. I love it

 

did u get tuned to run the 2.9 or is it off the stg 2 tune

 

yea would like to know also..wana do this in the future

 

Also, with your heat exchanger, make sure you get all the air bubbles out of the lines. It will take some time but make sure you do that.

I believe he is just running off of the GM Stage 2 tune.

 

if he is still running off the stage 2 tune then he shouldnt feel any difference. Just cuz u drop pulley size doesnt mean its going to give u more power directly and just cause you add a h/e doesnt mean the blower and hoses are actualy going to be cooler to touch. The h/e cools the IAT and wont effect that actual parts you can touch. So either he changed the tune or he is overexaggerated abit.

 

He should notice some difference between the 2.9 and GM Stage 2 puley even keeping the same tune. How much, I don't know.

 

yea with the 2.9 and gms2 tune you dont feel any difference top end. you feel more pull on the low end tho thats for sure! i have a 2.95 with gms2 tune.. no h/e yet, as im saving up for the ottp stage 1 and their h/e all at one purchase.

so yes. you would feel a difference. im just not sure if you can tell a difference with the h/e

 

i have a similar setup

 

Thanks for letting me know. I just bought the ZZP heat exchanger for my supercharger build. How much boost are you getting with the 2.9? I ordered a 3.0.

 

i get 16 psi with mine

 

its not the same boost levels for 2.0 then as a 2.2/2.4, youll see about 10-11 psi with the 3" pulley

 

sounds about right with gm stage 2 I get 14 psi

my comment should have gone before you.... lol

 

agreed. Just b/c the hoses and s/c are cooler doesn't mean you're making more power. It's just most likely a small indication that you're making more EFFICIENT power. And as for the pulley, it's not a significant change from the stg2 pulley. So the only way you made more power is by retuning to allow for more boost, or to up the rev limiter or something of that nature.

Glad you're happy with it, but if you really want to feel some difference, put on some bigger injectors.

 

YOU GET 14 PSI OFF THE STAGE 2?!?! Thats not right dude something is wrong with your setup. I get sixteen to seventeen all summer long and in the winter time with cold cold air I can hit eighteen. You need to get your **** checked out buddy. Oh wait a minute..... Do you at least have cold air and exaust? That would make a difference I guess.

 

once again, he cant notice any difference. Doesnt matter what pulley u put on it. Its all about the tune. If the tune detects a smaller pulley it wont spin the blower as fast to keep with the tune. Same thing with the h/e. It will detect colder IAT but without someone changing the tune it doesnt give any extra power. And i know he doesnt have it but that is the same with meth. Cooler temps but no power gain unless u change it.

 

i got 12 psi with the gm stage 2 pulley

I had a 2.4 ss

 

i got up to 15 when i was stg 2. now i get 17 on my new set up.

 

stock i was hitting 12.5 bone stock .then when i got stg2 full boltons 2,9 and a tune i was hitting close to or just about 18psi......now im just a stg2 with a 3in exhaust and im maxing out at 16psi

 

Can you elaborate on this a little please. Im kinda confused as to what you mean because it is the size of the pulley that controls how fast the blower spins not the tune. The smaller you go the faster it will spin. Whether or not the injectors can keep up is a different story. With the 2.9 on the stage 2 it does make a little more power. I ran it for a while it throws you back in your seat a little harder when you first hit the gas but top ends about the same.

 

what i mean is if the pulley is small its obviously going to spin the blower faster. The tune that is set gives the proper amount of air and fuel...as u all know. If you change the pulley or injectors the tune still stays the same, its not going to change. Yes the pulley is smaller but the tune wont add the extra air into the mixture. If it does then there is something wrong. Most would think since you add a smaller pulley it adds more air and it would lean out the tune. Wrong. You have to change the tune for it to lean out, it wont do **** by itself. When i got my 2.8/60's i didnt get the proper harness and didnt realise it until the 2.8 was on. So i was running 2.8 with stock injectors and took it easy. But there were times when i did go into boost and it didnt feel any different. When i added the injectors and the tune it felt 100x different

 

i get 14 on the stock pulley? why so low on gms2?

 

altitude perhaps, i dont know where michigan is at but it can have an effect, and a free flowing exhaust.

 

adding a bigger pulley leans out gm's overly rich stage 2 tune.

 

how would a bigger pulley lean it out, wouldnt that make it even richer, the smaller the pulley the more air you are adding. if the tune is rich you want to get a smaller pulley and change the tune, not a bigger pulley

 

a smaller pulley does not lean it out it makes the Injectors work harder and makes the duty cycle longer. it may seem to have leaned it out but in reality the injectors cant be pushed harder then they already are. bad explaination on my part, but like said before get it tuned. smaller pulley will put your injectors at risk depending on the size of the pulley and the injectors.