pulley drop help!

**hockeybawler** · 09-11-2012

Alright so I have done about 5-6 pages of reading on dropping pullies and want to get a few things straight before I jump on into it.
So first thing first, I have a 04 grand prix gt1 that has a top swap and headers in the mail and will be installed in the next 2-3 weeks hopefully! I will be running a gen V S/C.
Next I am buying a aeroforce scan gauge to scan for KR before I think about any further modding.
After all of this I will be running the gen V top swap, headers, CAI, maybe new plugs and wires, and a tune. With all of this if I have no KR I can safely drop to say a 3.6 correct?
I hear you will be faster on a larger pully with more timing compaired to a smaller pully with less timing, is this true and can someone explain this to me a little more?
Also I hear if I am dropping pullies to go with a MPS, what exactly is it and can anyone shed some light on why to get that? Thanks for all of the help in advance!! I am sure I will have a few more questions on the way

**bps02gtp** · 09-11-2012

Mps stands for modular pulley system. You want this because you can easily swap pulley sizes. This is done because there is a hub that goes on the supercharger snout that holds the pulley on with 5 screws.

Being stock the pulley is pressed on so instead if you press the hub instead on all you have to do is remove the screws to swap the pullies.

**Fivefingerdeathpunch** · 09-11-2012

With having the high comp block, you may not even be able to run the 3.8, but who knows.

You are just going to have to wait and see what the car likes.

**ctracer** · 09-11-2012

to play the safest route, i would not go lower than a 3.8 pulley until you can scan and get a real nice tune dialed in.
then MAYBE you can drop to a 3.6, but thats a big maybe because it is a higher compression block.

**hockeybawler** · 09-12-2012

Oh wow I didn't read that in all the other posts haha thanks for letting me know!! My S/C is coming with a 3.2, just out of curiosity what would I need to run that? cam, intercooler, rocker springs, headers, plugs/wires, headers, and tstat?

**txslow6** · 09-12-2012

Lol at people in here saying NA is "high compression"

**Bio248** · 09-12-2012

Originally Posted by txslow6

Lol at people in here saying NA is "high compression"

for what it is, it's the "high compression" block. however, you're right. 9.4:1 isn't even close to high compression.

**indygrandprix** · 09-12-2012

Originally Posted by hockeybawler

Oh wow I didn't read that in all the other posts haha thanks for letting me know!! My S/C is coming with a 3.2, just out of curiosity what would I need to run that? cam, intercooler, rocker springs, headers, plugs/wires, headers, and tstat?

Your going to need a 3.8 pulley. A 3.2 on an NA block would just be asking to chip a piston and you'll have a lot of KR

**TLSheff** · 09-12-2012

If you have the $$$ to do it, I would order in a MPS with a 3.8 & 3.6 pulley, that way when you go to get it tuned you can play with it and have them scan for KR while its being tuned and if the 3.8 is all good with 0 KR at WOT you can consider dropping.

**hockeybawler** · 09-12-2012

I am not going to be running the 3.2 anytime soon haha, I was just curious what is needed to run it. And I guess the 3.2 that comes on it is a mps so all I need to do is buy a mps 3.8 and take out the five screws and put the 3.8 on and screw it in? No pulley removal tool needed?

**matt5112** · 09-12-2012

Originally Posted by txslow6

Lol at people in here saying NA is "high compression"

Lol at reusing the same post.

**hockeybawler** · 09-12-2012

Now with the set up I have, would you say to use 89 or 91+ octane gas? Or is that more of a see how your car acts and see how much KR each brings type deal?

**blueguy** · 09-12-2012

Originally Posted by hockeybawler

Now with the set up I have, would you say to use 89 or 91+ octane gas? Or is that more of a see how your car acts and see how much KR each brings type deal?

LOL @ this octane question being serious.

Read the link in my signature.

And read the links in the link in my signature.

Then get back at me.

**hockeybawler** · 09-12-2012

I saw the thread by reptile the first time I read the safely modding thread but not the second time lol, guess thats what happens when you try and read through stuff fast before work

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