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what size pulley

F

frdyam400

New member
i have a 98 gtp with autolite 106 plugs a cold air intake an a 180 thermostat, what would be the best supercharger pulley to get for my car. i dont wanna change any internals on it
 


i thought the 3.8 is what the stock pulley size is? an what is the best pcm reprogram to get? ive heard from sum ppl that zzperformances pcms are junk???
 


Also.

Colder plugs are doing nothing to help you at a stock pulley, neither is a colder temp T-Stat...that's just giving you crappier MPG's than a stock 195*. Get flow mods...headers. They are $200. Then get a PCM. Then get a pulley.

Then get a custom in car tune from someone local...there are plenty of people in PA that can tune...and tune well.
 
how would a colder thermostat effect your mpgs that is doing nothing to your engine to make it put more fuel in the engine, its not going to effect your computer to set the fuel higher
 
Facepalm.....read the link provided before you say anything else. If you knew what you were doing then you wouldn't have to ask this question...read, and learn
 
frdyam400 said:
how would a colder thermostat effect your mpgs that is doing nothing to your engine to make it put more fuel in the engine, its not going to effect your computer to set the fuel higher
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When your computer sees that the coolant temp is cooler than normal it richens up the AFR (air fuel mixer). Just like it does on a cold start up...a colder engine needs more fuel. Thus giving you sh!tty mileage.

And I would have at least some headers before you think about dropping pulleys. A smaller pulley is going to suck a lot more air into your engine and you need a way to get it out as fast as it's going in.
 


frdyam400 said:
how would a colder thermostat effect your mpgs that is doing nothing to your engine to make it put more fuel in the engine, its not going to effect your computer to set the fuel higher
Click to expand...

Check out Verz's post...

You need the read and research mod like I stated.
 
yea a 180 thermostat is not going to bother that cuz once your car warms up the pcm goes out of closed fuel loop into open fuel loop
 
frdyam400 said:
yea a 180 thermostat is not going to bother that cuz once your car warms up the pcm goes out of closed fuel loop into open fuel loop
Click to expand...


Out the behind talking.....The PCM commands different AFR's at different operating temps. Richer the colder.
 
frdyam400 said:
yea a 180 thermostat is not going to bother that cuz once your car warms up the pcm goes out of closed fuel loop into open fuel loop
Click to expand...
Obviously you don't understand how a thermostat works.

A 180* thermostat will make the car run cooler than a 195* thermostat so the car never "warms up" to operating temp and will therefor affect MPG because the ECU is being told to dump more fuel.
 
Hmmm I find this 180 tstat findings very interesting. My tune money fell through soo. Anyway how bad on a guesstimate scale would it hurt it cuz i will go swap tht sh*t out to 195 today
 


It could affect it by as much as a few mpg. On top of that since the car never reaches operating temp and there is more fuel in the system it will cause carbon build up on the valves.

A cooler thermostat is another one of those old school mods that had some merit in the carbuerated, non ECU world.
 
stealthee said:
It could affect it by as much as a few mpg. On top of that since the car never reaches operating temp and there is more fuel in the system it will cause carbon build up on the valves.

A cooler thermostat is another one of those old school mods that had some merit in the carbuerated, non ECU world.
Click to expand...

Good to know going back to 195. Shoulda just stuck with the Bas***d. Atleast its a easy fix.
 
Please correct me if m wrong tho but if he got a Tune then the 180 tstat wouldnt affect his mileage as long as the said tune had the 180 programmed in it. Man I should know this crap by now
 
The way I understand it, the out-of-a-box tunes run rich as is. I don't think they take into consideration what t-stat your using...
 
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