Should I have it at 0.50v like the book says or will advancing it too 0.55v be better??

I need some input here!

Every car will be different. What is good for one car may be bad for another. Main difference is the mods. Just try each and see how it feels and check the plugs often.

The TPS is probably fine where it's at. Turning it up wil do nothing but make your car run rich. Rich=less HP. Buy a timing light and adjust your timing, you'll gain real HP.

Umm reach doesn't = less HP I mean it all DEPENDS

you have to check your sparks to see if they are burining well if they are too white it means you are too lean...and need more gas on the car so it all depends you have to find a happy medium.

in N/A running LEAN is good but not that lean...its not healthy for the engine.

anyways you must check your sparks and see...the engine will tell you what it needs :)


I just wanted to point that out...that rich doesn't really mean less HP.

nothing else to it.


Later.

And the O2 sensor will bring it back into stoich. so reading your plugs isn't going to tell you anything.

Originally posted by Probedude
And the O2 sensor will bring it back into stoich. so reading your plugs isn't going to tell you anything.


Huh:confused:

Originally posted by Probedude
And the O2 sensor will bring it back into stoich. so reading your plugs isn't going to tell you anything.

Originally posted by AaroNX



Huh:confused:


YUP LEFT ME DUMB TOO :confused:

thats how much ppl know bout cars here oh well.

sparks will always let you know if you got too much air or fuel in the engine...I have no id what the O2 sensor got to do with that.

Originally posted by Digitek



I have no id what the O2 sensor got to do with that.

Didn't think I had to explain it fully for you guys.

The ECU reads the O2 sensor to adjust the injector pulse width to maintain the 'ideal' air/fuel ratio.

Fiddle with the TPS and though this may help with throttle tip in, and WOT, it isn't going to do anything for cruising around. While cruising around the ECU is going to run in closed loop, adjust the injector pulse width based on inputs from many sensors - including the O2 sensor.

Unless you do a WOT run, shut down at the end, coast in and pull the plugs, your plugs are going to look normal.

I tried to adjust my TPS last night, and it was at .39V. The most I could get out of it was .42. It won't rotate any more, it seems .42 is ALL I can get out of it. Do I need a new one? My car feels fine...

Matt

DId you loosen the bottom screw too or just the top one. Probedude I knew what you were saying about the O2 sensor, but reading your plugs is a necessity. If what you are saying is true then nobody runs rich or lean. EVER. Adjusting the TPS is a good way to adjust the amount of fuel given to your motor. Most people will agree. We should start a poll on who actually thinks their car is running Stoich right now. Not me.

AaroNX,

I loosened both screws as far out as they would go without them falling out and somewhere into the engine bay. It's like something is holding it from rotating more...It really won't go past .42.

Probedude, your right but Im assuming their looking for performance so if your tunning the car you should check sparks after every pass or a few passes you know..

at crousing I don't really mind since its not like your gona feel any diference crousing...maybe little. but any ways @ WOT is where the fun is hehe and thats what i was talking about checking sparks too see your air/fuel ratio.


thanx for the o2 sensor explaining.

can u guys gimme some more imput on wheter you guys have it at .5 or lower/higher and what mods do u have.

it kinna felt better going from .5 to .55 but im not a dyno

If your car runs fine, idles fine, then don't fuck with it. .45-.55 at close, 4.0-5.0 at WOT. Adjust it to factory specs, save your time and money for other mods.

Most 2 liter motors like to run lean at high RPM's. The FE3, B20 and sr20 like lean conditions at high rpm's. I'm not talking dangerously lean, slightly. If a rich fuel condition didn't cause you to lose HP then why even have a stoich condition, or any for that matter.

A turbo car owner may have an EGT. (exhaust gas temperature) A high exhaust gas temperature is caused by a too lean condition. When dynoing the car, you try to run the car as stoich/slighly lean as possible to get the most HP. Too high an EGT and you melt your pistons or blow your motor sky high. Or you may choose the safe route, which is to run slighly rich, LOSE HP, but not run the risk of destroying your motor.

If you don't believe me, dyno your car at 34psi, buy a Stillen FPR and crank the fucker up to 50 psi and dyno it. Loss of power.Period.

Light grey to tan deposits indicate a stoich fuel mixture, not lean.
White FLAKES indicate premature detonation. Light grey could be confused for white.

Originally posted by silversx
AaroNX,

I loosened both screws as far out as they would go without them falling out and somewhere into the engine bay. It's like something is holding it from rotating more...It really won't go past .42.

You have to re-check that `casuse it really rotates...

Try http://www.sr20deforum.com/showthread.php?s=&threadid=23656&highlight=tps

i have a similar problem mine only reads .52 the highest, i wondering if i had 2 replace mine also.

Mine works fine, its adjusted to .48, but when it gets to 3.999 then I go a little more the TPS stops sending voltage, I just changed it out for anouther one I had and it did the same thing...weird, huh?

~Ryan

to really test tps sensors you actually need to sweep the sensor with a DVOM that has a graphical interface. As you slowly rotate the throttle you can find voltage dops and what not. From another post they stated that JWT said anything over 4.1 was a sign that the TPS was bad. at idle the volage was to be .45-.50(IIRC)

Originally posted by 93BlackBird
to really test tps sensors you actually need to sweep the sensor with a DVOM that has a graphical interface. As you slowly rotate the throttle you can find voltage dops and what not. From another post they stated that JWT said anything over 4.1 was a sign that the TPS was bad. at idle the volage was to be .45-.50(IIRC)

What is a DVOM? The digital multi-meter I was using has a little bar along the bottom that increases as the vlotage increases and it also shows the 2.958v or whatever...:confused: