Do I need a tuned PCM.

**Jbruce** · 07-24-2011

Do I need a tuned PCM to run a 3.4 pulley on my 97 gtp with supporting mods?

**TheOtherNick** · 07-24-2011

yes

**Jbruce** · 07-24-2011

Do you recommend any cause I have a zzp PCM but keep hearing bad things about them so I haven't installed it.

**TheOtherNick** · 07-24-2011

custom tune or a dhp tune from 3800 performance

**Jbruce** · 07-24-2011

Appreciate the help.

**Jbruce** · 07-24-2011

What's dhp stand for exactly?

**jmoore4294** · 07-24-2011

Digital Horsepower. Just the brand of the tuner they use.

**Jbruce** · 07-24-2011

Alright thank you.

**darkhorizon** · 07-24-2011

Stock PCM works ok with a 3.4 pulley... all a tuned pcm is going to do is pull out power that the 3.4 pulley gives you that the motor cant handle.

**GTPSHAWTY** · 07-25-2011

Originally Posted by darkhorizon

Stock PCM works ok with a 3.4 pulley... all a tuned pcm is going to do is pull out power that the 3.4 pulley gives you that the motor cant handle.

which means it will blow quicker with a tuned pcm

**Tuner-Extraordinaire** · 07-25-2011

Custom Tuned is best.

3.4 pulley just plain has diff fueling requirements than 3.8 pulley, not to mention MAF adjustments. Supporting mods or not.

**GTPSHAWTY** · 07-25-2011

oo i see thankx what do i need to tune my stock pcm? or do i have to buy another one

**Tuner-Extraordinaire** · 07-25-2011

A tuner interface such as HPTuners or DHP.

**GTPSHAWTY** · 07-25-2011

okk thankx

**GTPSHAWTY** · 07-25-2011

expensive?

**NegativeOne13** · 07-25-2011

Looking at 500+ unless you come across one someone is selling. Then you potentially will need to buy credits.

**darkhorizon** · 07-25-2011

Originally Posted by Nixon

Custom Tuned is best.

3.4 pulley just plain has diff fueling requirements than 3.8 pulley, not to mention MAF adjustments. Supporting mods or not.

Sort of right... The maf is fine, you never need to adjust that for pulley changes, but you typically have to throw 10.5:1 or richer at most 3.4 pulley setups to run them cleanly... While doing that you will be reducing your power back closer to where the 3.8 pulley left you.

**Swiggles** · 07-25-2011

youll be safe with a 3.6 or 3.5 with a stock tune, start with the 3.6 to be safe and make sure you have no kr. try to find someone in your area with a tuner, experience is key to a proper tune. they will likely want some money for the tune but $100 is better than $500+

**Taz Magister** · 07-25-2011

tuneing makes all the difference It really does

**GTPSHAWTY** · 07-25-2011

Originally Posted by Swiggles

youll be safe with a 3.6 or 3.5 with a stock tune, start with the 3.6 to be safe and make sure you have no kr. try to find someone in your area with a tuner, experience is key to a proper tune. they will likely want some money for the tune but $100 is better than $500+

their arent too many ppl around here that tune these cars better yet think they can go fast.... i've been looking since i got this car