Has anyone actually run with the GMPP Stage 2 for a little while, then switched up to a 2.8" pulley?? Was the difference noticeable? Dyno sheets?

 

hp difference is nill. You will gain slightly more TQ.

 

once I get a tad bit o cash to get it I will let you know. I have been on stage 2 for over 4k miles (roughly 4 months).

 

I wouldn't say nill, Your adding more boost, and that is equating to more hp, for every lb of boost more you add, you can expect 8-10hp give or take.

 

i thought everyone was saying the difference was huge? specially on the top end

 

Based on?

 

I was wondering the same thing.

Later

 

i slapped a 2.85 on there an noticed a difference.

 

Yeah "nill" is way wrong. Going from GM stage 2 to a 2.8" pulley will give you 15-18whp.
The jump in torque is where it's at though. I don't remember the torque specs.

 

actually guys i talked to intense about this and they said dont do it because the 42.5 lb injectors dont flow enough to compensate for the 2.8's ability to make more boost, so you wont see hardly any more boost

 

How could that be true when iam running 42.5s with a 2.7, And iam seeing 19lbs.

 

Well on the dyno the hp numbers might be higher but in the car driving tells me the major difference is in tq.

I drove in a stg II car and then one with a 2.8. Felt nearly Identical. I don't go by dyno's because not all of that number is what is going to be transferred to the pavement regardless if it says whp or not. You will feel more bottom at the low end and little more push at the top. At WOT the STG II and the 2.8 STG II were neck and neck. You have to take into consideration that more heat is generated with a smaller pulley. Also the timing is for a 3 inch.

 

Thats where hp tuners comes into play.

 

42.5 lb will support down to a 2.8" safely from what I've seen, but no more. I do know that a 2.6" pulley is too much for 42.5lb injectors. If you drop to a 2.8" pulley on your stage 2, you'll love it. You will gain noticeable horsepower, but the instant torque is what you'll love the most!

 

hp tuners is the next thing for me

 

but wait how could numbers be different on the same car but the higher one is no better than the lower one?

 

^ i disagree with the HP by butt dyno but agree with the TQ

The easiest way to figure this out is to have a meet. I found that there is at least one of every setup at the meets i go to and hold. I have been able to hear all the exhausts available for this car inside the cabin and out and been to ride in cars with intense stg 5 , GM STG II, Intense STG 3, hp tuned vehicles.

One thing I have noticed. The intense stg 5 car wasn't blowing the doors off of anyone. It was faster than my car and the stg II but not by much. Perhaps it was the driver , just stating an observation I had. I think a lot of power is being stolen by heat.

 

Yeah, but that's not really a fair comparison. Two cars will respond differently to mods, every car is different. Perfect example: I went to IDD with Rob, and him and I had the same mods. We were identical except I had the GMPP manifold. He trapped 2mph higher the whole day, and et'd quicker with the same 60'. There will be horsepower gains, but you're right about it not being a whole lot. I would say the 2.8" is worth ~5-8whp, ~15+wtq.

 

I have seen 400 hp cars rip apart 500 hp cars of the same model. I can't explain it other than driver, gear changing or other misc. factors. All's I am saying is from a stock GM STG II and one with 2.8 you are not missing much. Now it will be a little faster but I bet if you raced someone with STG II and you had STG II + out of 9 races it would probably be 5-4 or 6-3 in favor of the 2.8

 

so then everyone agrees that the most benefit to the mod is wtq power?

 

I concur

 

I felt a little difference, it wasnt light and day, but I could feel it. Went from like 16 lbs to damn near 18

 

YIP!

You can feel the increase but she hesitates and feels like she is being held back and is inconsistent. Need a tune badly, if you're doing this make sure you get a tune shortly after!

 

where can i get a tune from? do i have to order hp tuners running a 2.8?

 

start talking to local shops and see who has hp tuners, if no one has it ull have to wait til they do or pay it yourself. The 2.8 requires tuning, for me neways.