the knock seemed to be real and happening between 3000-3500 . I was able to get it all out by lowering my timing to 29. It's 27 in the tables but two comes from somewhere. Every once in a while if...

Seems to be a little discussed topic at least in the Lt tuning community. And it seems like the adjustment names are different. I'm running tuner pro.

If anyone comes here in search of answers,...

Just trying to understand tuning these to try and help the factory knock system on my 95 lt1 work better. Its rebuilt, with a c503 cam, headers, roller lifters, etc..

i was getting some extensive...

So ive been searching and was wondering if maybe i need to look into actually adusting the knock sensor? so far i found this


1.) Knock Fast Attack(Higher number means a more aggressive KR)
2.)...

Well back again guys, thanks as always for the help provided before.

Im having some issue tuning my spark advance now.
During normal driving when i accelerate hard i have no advance issues at...

Things seem to be going well. The wideband gets more steady the closer i get things adjusted.

Im struggling tuning the top end ratio though because im not logging the wideband yet.

Can anyone...

Lion ive searched a lot about the throttle body thing and i see a lot about it on aftermarket it but i don't think you can do it on the stock? i havent looked into it as much as i need to. my idle...

edit: changed, started tuning it new questions ha.

most important question, at idle, with these settings, my right hand 02 is reading like 100 all the time, left hand like 900, wideband 16 and...

I greatly appreciate the time taken to explain these things and I agree its worth it. Plus I want to really understand this tuning process, I'm sure this won't be the last car I do.


Now I...

ok, i switched it to that.

not sure if you caught my edit,
just to make sure i understand perfectly, i will drive it like this (pe disabled, closed loop disabled and open loop afr set to 13.5)...

ok I still have a lot of questions, but im going to try and take this one step at a time so i dont get overwhelmed and confused.

First im going to try and tune the maf table the way steveo...

So foes that mean its kinda OK I just took a weird way of getting there ? Ha I guess it also means it will make the rest of the rune hard to get dialed in because other things are adjusted...

So after I do this its still acceptable to change it a little if neccissary to get blms correct?

But also once I've done what you suggest, should I purely adjust pe air fuel ratio by the two...

Steveo, do you use this method purely to tune wot or is this something for cruise as well?

I have already changed my maf about 10% lower from about 25 airflow to 50 (approximately) to get my blms...

Well good update, tonight i re-did my exhaust where my wideband was located because it was slightly smaller than the rest, and i welded it with a gasless so it was horrible.

long story short, at...

Hmmm so that all makes sense. I think tonight I should take an average over one of my cruise 02 number logs and see what I come up with and how it compares to what the wideband says.

Thanks for...

God ive edited this so many times. so i was thinking, i guess what yall are saying is if its switching back and forth somewhere around 500 at cruise then it should be close to stoich. That does make...

I'm not sure what that means about if its switching its OK. As far as I've seen cars will still switch back and forth because of the attempt to correct themself.

I believe most would agree the...

Update for whom it may concern. I have yet to find anyone with a stock lt1 using a wideband to see what the cruise air fuel ratio is. So this is just in referance to studying how various cars cruise....

Yes it seems to do well all around, after a wide open run and shut down the plugs were a little brown.

After doing way too much reading about descreening mass air flows tonight, i feel that could...

That sounds pretty close to what mine does. It drives great. Gas mileage seems decent. The only thing that concerned me was the wideband reading and when I removed the plugs they were a little whiter...

I guess I should ask should I just kind of ignore the blms and tune with my wideband and plugs ? And then see where I end up? If so should I try and tune with the be tables or maf or what. Aldo I...

Heres a quick idle log, and a long drive log. sorry i didnt have a chance to record a shorter one today. Also thats the current tune im running.

what steveo said about the closed loop really has...

I hadn't really realized it but it is completely to do with closed loop. In open loop its right on. 13 at idle 14-15 cruise. I guess I kind of assumed open loop should run really rich. Also something...

Alright first off thanks to steveo and others for the help diagnosing the drivability of my car. 1995 firebird, rebuilt .040 over, comp 276, pacesetter midlengths, using tunerpro and winflash. Ive...