Do I need a tuned PCM.

[Jbruce]

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

[TheOtherNick]

yes

[Jbruce]

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

[TheOtherNick]

custom tune or a dhp tune from 3800 performance

[Jbruce]

Appreciate the help.

[Jbruce]

What's dhp stand for exactly?

[jmoore4294]

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

[Jbruce]

Alright thank you.

[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.

[GTPSHAWTY]

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]

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.

[darkhorizon]

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.

[GTPSHAWTY]

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

[Tuner-Extraordinaire]

A tuner interface such as HPTuners or DHP.

[GTPSHAWTY]

okk thankx

[GTPSHAWTY]

expensive?

[NegativeOne13]

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

[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+

[GTPSHAWTY]

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

[chevyy1212]

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

Ive seen you on thechicagogarage right?