Mods needed for 3.5 S/C pulley?

**M7x350z** · 04-16-2014

Hey guys. I'm new to this whole forum thing, but I heard it's really useful. I have a 2000 Grand Prix GTP. I have a cold air intake and and MBRP resonator. I've been wanting to add mods to my car for awhile now, and so I did some research and got a 3" downpipe w/cat and u-bend delete, 180* Tstat, autolite 104's, polyurethane upper motor mounts and a 3.5 s/c pulley. I haven't installed any of these mods yet, but I want to double check if I need anything else in order for my engine to not blow up from the decrease in pulley size. Thanks in advance

**REDCRAPGP** · 04-16-2014

You need something to scan with

**Russosaur** · 04-16-2014

http://www.grandprixforums.net/showthread.php?t=67580

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**ericspecullaas** · 04-16-2014

^^ better read that a few million times or you will blow your motor

**Russosaur** · 04-16-2014

Well I would say based upon hensley getting knock with a 3.5 with roughly same mods you have but he has 1.9 rockers. Your probably gonna need a plog also. But every car is different. You also don't need a u bend delete if you have a downpipe. Read that thread like the bible, and scan for KR before you drop pullys.

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**M7x350z** · 04-16-2014

Thanks guys. When you say that I need something to scan with, what do you mean by this? Sorry, I'm new to the whole modding thing.

**REDCRAPGP** · 04-16-2014

Better not even touch the pulley until you fully understand KR and have something to scan with

http://www.grandprixforums.net/threa...Explained-here

Start reading that

**98buicksupercharged** · 04-16-2014

I'd just do headers

**M7x350z** · 04-16-2014

I'll start doing some research. I started to look over how to properly mod a 3800 series II, but it seems like that's for a 3.4 pulley. I've read that a 3.5 pulley with produce 9-11 psi in the supercharger. I'm not looking to go full out till the engine goes out at 175k miles. I just want a fun and quick ride, may 280-290 HP. Any NEEDS that I need to install for a 3.5?

**Alix0r** · 04-16-2014

F it just strap a 3.0 on that *****.. go big or go home!!.

**Bluemagic** · 04-16-2014

Go boom and go home.

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**l67ss** · 04-16-2014

Id still do the same supporting mods as for a 3.4. Ive heard of guys running 3.4s no other mods just fine, on the other hand ive head of guys with a 3.6 busting pistons. Best to b safe not sorry. Besides, the more supporting mods you do the more hp you get

**M7x350z** · 04-16-2014

In your guys opinion, would having a K&N Cold Air Intake, 3" downpipe w/cat, u-bend delete, MBRP resonator, 180* Tstat, autolite 104's, and poly motor mounts be enough for a 3.5? I also just got brand new LIM gaskets and a new supercharger gasket. While I was at it, I threw on valve cover gaskets as well.

**REDCRAPGP** · 04-16-2014

Nope.

I imagine you'll still be knocking

**goldgp** · 04-16-2014

Neither the t stat,res,or poly mounts are helping in the kr department really.

**M7x350z** · 04-16-2014

What about a ZZP 1.0 PCM?

**REDCRAPGP** · 04-16-2014

Better canned PCM out there... ZZPs seem to be a bit or miss some guys like them, a good portion have problems with them.

**goldgp** · 04-16-2014

That would be a step in the right direction,but an incar tune from a reputable person in your area would be best,and close to the same price.If you could find someone that is.