M90 pulley size opinion

[W30post]

My 04 is itching for a new pulley. I'm undecided on the size.

 

I think the 3.4 is for me but what is the 3.25 going to do for a mostly stock 04 car.

 

Can you get away with no PCM changes on the 3.4 pulley? Not trying to be lazy just wanting to know what to expect.

 

Will plugs have to change for the 3.4 pulley? I have another car that is fun. This one just needs a little more.

[95 vert]

Check out the tech articles on ZZP's website. Pretty informative.

 

[Euro]

http://www.wbodystore.com/grandprix/What-size-pulley-can-I-run-a-23.html

 

Here's a good arctile from wbody store. This should help ya out!

[jeremy]

My 04 is itching for a new pulley. I'm undecided on the size.

 

I think the 3.4 is for me but what is the 3.25 going to do for a mostly stock 04 car.

 

Can you get away with no PCM changes on the 3.4 pulley? Not trying to be lazy just wanting to know what to expect.

 

Will plugs have to change for the 3.4 pulley? I have another car that is fun. This one just needs a little more.

 

do some research before just throwing on a smaller pulley....in some cases dropping a pulley size without any mods can cause so much KR that you actually would end up with less HP

[Addicted to eaton]

do intake, then u bend delete, then t-stat, then get a KR scanner, get a 3.4 have it tuned. I would stay with a 3.5 to be safe. Dont just slap a pully on there or you Wont have a car.

[sl3196]

do intake, then u bend delete, then t-stat, then get a KR scanner, get a 3.4 have it tuned. I would stay with a 3.5 to be safe. Dont just slap a pully on there or you Wont have a car.

Don't even mess with the u-bend and just do a whole new downpipe. The gains from just the u bend aren't worth it.

[W30post]

I've been reading around. I understand what you guys are saying here. Not real sure I want to put this much into a car I should just drive. Would be fun but my foot will be heavier on this combo.