Ballistic-Chapman

At idle or regular driving, the car A/F meter remains at stoich. When i'm at WOT or approaching it, the A/F goes rich. The problem gets worse when I go from 14 to 15 psi boost. Also when i'm changing gears, I will get the occasional backfire. Any ideas what it could be? I'm leaning toward the oxygen sensor or injectors.

Car has no cat, no oil in intercooler pipes, and no vacuum leaks.

picture of crusing and idle:


picture of WOT

sweanders

Sounds like your car is behaving the way it should be to me.

billindenver

It is supposed to go rich on WOT...if it doesn't, then you have to look for what is wrong.

jmporsche944

Yeah, you want to be in the green under throttle if thats a narrow band.

MPD47

Horrible Narrowband A/F gauge with generic readings. Get a Wideband with numbers and then post how rich you're really running.

Ballistic-Chapman

What would you recommend?

MPD47

That's a point of strong debate in my book, I would talk to one of our vendors and let them sell you something.

ivai

You'll hear a vote for nearly every available wideband o2 sensor on this board.. Just do some research and pick one (or let a vendor tell you what to buy, as Mike suggested).

My car runs rich under WOT too, its normal and a good thing (Oh, and I get backfiring sometimes when I let off the gas).

KuHL 951

There is no magic pill. I think if my cars run rich under WOT I count it as a blessing opposed to running lean. Every run I have been on the 951's always have a bit of unburnt fuel in the exhaust. I would much rather foul an O2 sensor or cat than buy a new motor.

Ballistic-Chapman

Used the search feature and decided to go with the Zt-2. Will be fun to learn something new and fine tune my car!

lart951

Dude that's horrible, adjust your a/f to run 14.7 at wot, lol , your car is running fine just if you want something simple and accurate get the AEM wideband for $ 218.00 installs in 20 minutes or so.

check the video it appears next to my boost gauge. I also use the lm-1 for datalogging.

http://www.youtube.com/watch?v=4tAdsNsXOGk

Ballistic-Chapman

AEM wideband won't let me datalog and make adjustments correct?

edit: nevermind you are using lm-1

edit again:
Lart, why would you buy the AEM for 218.00 and then the lm-1 for 350.00 when the Zeitronix allows you to do all that for less?

lart951

I bought the Lm-1 originally the advantage is that you can use it on many cars in matter of minutes the zeitronics doesn't allow you to do that efficiently, in my case since I have more than one 951 the lm-1 is cost effective.

The DareDevil

Speaking of Zeitronix... I should be receiving a package in the next couple days

Ballistic-Chapman

Nice. Please provide a review when you are done!

I also found this:
http://members.rennlist.com/tom86951...nd%20wires.htm

hopefully you can use it on your 944