Hey everyone, just curious whether this is "normal" or not : when I go to full throttle from cruising speeds, I usually notice my a/f gauge go rich only a second or two after I actually get on the pedal - it seems to lag behind... if one decides to step on it, would the o2 sensor voltage generally "wait" a little bit before changing, if so, does fuel delivery get delayed too? Or is my A/F ratio gauge screwed up (I know they generally are considered to be garbage)... I'm pretty sure the wiring is okay

From what I understand, it should go out of closed-loop (ie. LED's should stop bouncing left to right - it's an Autometer) as soon as I mash the gas pedal....

... the EGT gauge and the apex-i are pretty much at my door - I'll be installing them in the next week or two, but the EGT still wouldn't tell me if I'm running lean for 1-2 seconds, because temperatures wouldn't be able to build up in time (correct me if I'm wrong there too lol). I don't want to hurt my engine in the long run, and I'd imagine running lean under boost even for a second a day will eventually cause something worse to happen...

 

Hi Jer!
sorry that I couldnt help you on the first question...because I dont have a A/F meter. I have an EGT.
I was under the impression that a good EGT will be a better tool to monitor A/F ratio. So far, I havent heard any good comment about Autometer A/F.... reading the EGT is more simple IMO. At 600 -650, you are running rich and above 800, you are leaning out. I have been to 870 more a brief moment (uphill racing) and most of the time, I keep her below 800. (all temperature readings above are in Celcius) I believe as long you keep it under 800, you are doing fine. A NA 4th gen maxima got a reading of 1500F (that's about 815C) after running 1/4.

more important....restrictive exhaust is also a cause of hight EGT. having a free flow exhaust plus test pipe and Y will lower it significantly.

btw, belt replacement is almost done....almost. (waiting for bolts from stillen)


have a good one.

 

Jer, I read that it was normal. Which O2 sensor did you use btw?

 

Hey Maxi-OD! I was tempted just by looks alone of the A/F gauge - I guess there's a bit of ricer in me eh? I'm still comforted a bit by seeing the rich condition sometimes though : it's better than seeing lean or not having a gauge at all.. Personally, I'm going for both AF and EGT anyways so I can see what's happening before and after the motor... as far as the exhaust is concerned, I'm not sure what I want to do with it : I've heard a magnaflow and still thought it to be a little too ricey, so I began looking into the Dynomax Superturbo, and I don't know if there will be enough airflow there ... ah well TBD - I didn't know EGT's would be that high on a stock max though!

Good luck with the reinstall; after all you've been through this should be a cinch - and then hopefully you can enjoy it without anymore little problems!

Funnylittle : how many o2 sensors are there that can be tapped into!? I left the gauges to my friend.. I suck at all automotive that is electrical

 

I believe 2 and one after the cat... which is not advisable b/c it doesn't do anything.

I'd ask your friend which one he used.

If he used the one after the cat, then it might have a problem, but like I said, it does sound like it's ok

 

I would prefer to have the car running rich too....even though it will mess up the O2 sensor eventually...but at lease the engine lives longer. What do you mean by "before and after"?

exhaust - ah....that's the next project of mine. I am thinking about using the stock B-pipe and have a muffler shop to fix those crimps and bents. Or I will get a B-pipe from warpspeed....but dunno how long am I going to wait for that. I am really broke right now and I have a trip to go to next week. waiting for Uncle Sam to give me my tax return.

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Good luck with the reinstall; after all you've been through this should be a cinch - and then hopefully you can enjoy it without anymore little problems! : D

thx I enjoyed every moment of uninstall and reinstall the blower except the alternator bolt and the moment that I thought I stripped the long bolt from the plate to the blower. It is a good experience besides my parents are nervous because they think that I dunno what I am doing. Now I am waiting for bolts from stillen to complete the install.

hope this belt will live for 40,000 miles

 

Hmm well he tapped into a wire at the front of the engine bay (I very much doubt anyone would tap into one in the deeper plumbings of the car hehe). There is no fuel mixture in one's exhaust

Maxi : I'm on the 6:1.. shouldn't be too rich What I meant by before and after : the a/f ratio gauge shows what mixture the o2 sensor sees going into the engine, and the egt shows what happened by means of exhaust temp... I figured it can't hurt.

I'm thinking of getting the af ratio gauge recalibrated, or getting a small digital readout showing the o2 sensor voltage; that way there's no gauge in the way of telling me what the sensor is actually seeing

 

You should be ok Jer... That's just how the A/F works

 

You mean to say that there's a gauge as retarded as the driver of the car then eh?

 

lol

Hey I bought one too, but now I have to sell it b/c I don't need to monitor a/f or egt anymore since I'm not gonna boost

 

I see you point now.....unlike others who install it in the exhaust manifold, my EGT probe is installed on the y-pipe. it is even far away from the engine bay. the reading may not be accurate to what happened in the engine. I agree with you that having both will be a way to monitor what goes in....and what comes out.