ok i was wonderin wht pulley size would go good with,

60lbs
zzp heat exchanger
ca header
cut-out
ngk spark plugs (1 step colder)
injen intake

im debating either 2.7 or 2.75 but i dont want to push it to far. i see alot of people go 2.8 but i dont want to be like alot of people lol but im sure theres a reason for the 2.8......... but i dont know alot about the lsj so yeah i really need some help!!!!

 

I got the 2.8.

 

anything under a 3.0 and i highly recommend supporting cooling mods. new heat exchanger, meth, dual pass, etc. 2.7" is the lowest i'd go.

 

ok so would a 2.7 be pushing it? cuz i dont want to blow it lol and i dont run the car to hard maybe 3 pulls a month......

 

since u have a zzp heat exchanger and you dont even run it that much id say u should have no problem with a 2.7

 

A 2.8 is rate at the edge of overspinning the blower. That is a large part of it

 

so go 2.7 if i want to risk my motor and go 2.8 to be safe? wht about 2.75? lol idk

 

go with the 2.8, 2.7 will make more heat for minimal power gain... plus if you have no cooling mods you will lose more power after a pull or two.

 

Truth here.
I have similar mods as you, NO meth, and my tuner says 2.8.
You would be Ok until around 6600 rpm...overspinning the eaton and creating more heat.
I have both a 2.7 and 2.8....I feel VERY LITTLE difference, if any....2.8 ftw.

 

back in the old days, people used to go 2.5 with a lot of cooling mods... i don't recommend it...but if you want to push your motor..that's how to do it. personally, a 2.7 is as small as i would go. With the mods you suggest, i would say a 2.8 is good, and you can run a 2.7 if you get a dual pass end plate to go with the larger HE

 

I ran a 2.5" for two years, no problems and ran like a champ.

Dual pass, 2 h/e's, meth, a few other tricks for cooling.

Not saying its the smartest thing to do but as long as you tune the car and treat it right it returns the favor.

 

well i guess ill be going 2.8 lol but can anyone tell me wht kinda hp to expect?

 

On a nice tune around 245~255 whp

 

wht would be the best way to get like 270 whp?

 

meth, dual pass, xtra h/e, killer tune 2.6"/2.5"...crossed fingers...lol.

 

get a 2.7, or you can have a 160* thermostat swapped in to replace the 180* factory one. retune. and run what ever the hell you want.

 

i know alot of the 3800 series engines swap to 160* tstats. would this be good for our engines, and what would it do for us besides running 20degrees cooler?

 

someone told me just to get a lower tstat and call it a day since i will be getting 1 step colder plugs

 

i've personally never tired this. but i've heard of a lot of people doing this. it doesn't do anything other than lower your cars "optimum operating temp" to 160, instead of 180

 

Why do we even have a search tool on this site?

this topic is as old as time itself.

 

I'm doing a 2.9 or 2.85..

 

i have stage 2 with a 2.85 pulley now. but ill probly jus go 2.75 cause some people say 2.7 is pushing it and some say it wont hurt it but owell.......

 

A 2.85" pulley is pushing your Stage 2 injectors right now...

 

i know lol but im goin to be goin to 60lbs injectors

 

I had a 160 tstat in my 02 grand prix gtp and it made a big difference all around and its a $10 dollar 10 min job so why not! Do they even make lower temp thermostats for our cars?