NeedforSpd_Z

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by McRat:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by GODUCKS:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by McRat:
<strong>go to www.76.com and station locator.

find stations that sell race gas. It's 100 unleaded at the pump. go 50/50 should be plenty.

Are you too lean at WOT?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The only 76 that sells race gas around here is 110 leaded race fuel.. If i mixed some of this would it hurt my motor?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes. Don't run leaded, it will "blind" your O2's and your car will run like crap.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not necessarily. you can run leaded octane every once in awhile it wont hurt you, just keep in mind though that it does saturate the 02 sensors and from prolonged exposure they can wear out prematurely. I wouldnt fill up on 116 everytime you go to the track(I usually get 5gallons) but A little wont hurt you. Were I go they sell 104(I think) thats the highest unleaded they make so you could try that if your worried about the leaded part <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

dissonance

well it looks like the 85mm maf might have been the root to the KR. i put the stock lid and unported and un/descreened maf.

put it to te floor and ran it up to a little over 100 and no kr.

looks like the 85mm is going. i might dump the wisper lid to. does any one see any gains with the K&N FIPK? is there any way i can still my fast toys ram air setup?

2MCHPWR

iTrader: (10)

i'm glad you found the problem. that is what i thought caused your KR. i think you can keep your lid; it will have no effect on KR. dump the stock lid and use your aftermarket lid.

dissonance

I really like the wispier lid but it has a small crack in the back of the lid where the two parts are glued together.

I have tried to fix but it just brake again when I tighten it up.

I am planning on going with the slp lid. The MTI is a good lid also/right?

Do you think it's the fact that there is no screen in that 85mm maf? The slp version has a screen. Could it just be the z06 85mm maf does not work well with the 98’s? Or the f-body tuning at all? I see a lot of guys using the 85mm maf and they have not complained about problems

<small>[ August 10, 2002, 01:47 PM: Message edited by: dissonance ]</small>

2MCHPWR

iTrader: (10)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by dissonance:
<strong>I am planning on going with the slp lid. The MTI is a good lid also/right?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">SLP and MTI lids are both good. however, i think the direct-flo lid is the best. the rear of it tapers to smooth airflow slightly better than the other ones; but they are all good.
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by dissonance:
<strong>Do you think it's the fact that there is no screen in that 85mm maf? The slp version has a screen. Could it just be the z06 85mm maf does not work well with the 98’s? Or the f-body tuning at all? </strong> </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">i don't think the screen has anything to do with it. it's just calibrated differently & won't work perfectly for every car. sell it and use the money for something else <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

dissonance

when i got the z06 maf it said that is was calibrated for 98 and up f-body. <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" /> the stock 75mm works great, i know my HP is not even close to the point where i need an 85mm maf <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" /> but i really like the maf.

i have to really thank you guys for the help.

just playing around i put the 85mm maf on my stock air box and belows and BOOM! 3.5kr at 4500rpm+

Predator

I'm in the same situation as you. I'm looking for a stock maf (mine is ported and descreened). My car ran like **** with a Pace maf too. It runs much better with the ported stocker, but I'm practically maxed out in LS1 Edit, and I still have 4* of KR <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> . I'm hoping your solution is my solution too. Thanks for helping me, even if indirectly.

BillWS6Formula

I had much the same problems with KR after installing a Whisper MAF. KR out the wazoo - even after trying some homemade (using xylene) 100 octane fuel. Bought a MAFT and using the directions at the following link, proceeded to fix the problem.

http://www.c5forum.com/diy/ltft.php

It will take some time, but the procedure works. Start with your part throttle adjustments, making one step adjustments at a time and take it from there.

My car (even though it's a '98) ran lean (low .8xx O2's) even completely stock so adding the ported MAF just put it over the edge I guess. My final MAFT settings ended up at +10% part throttle settings (to give average ltrims around 0) and +10% WOT (giving 02's around .880 to .900). Give the car some learn time too between changing your settings.

Net result of all this? I went from consistent 4 degrees KR and timing advance in the low 20's to 0 KR and 29 degrees advance. And at the track from ~107mph trap speeds to ~109 traps.

Those MAFT adjustments may seem a bit extreme, but all you're really doing as someone already pointed out, is adding fuel to get back close to your stock a/f settings.

Trust the MAFT and AutoTap - they do work!

Predator

I hear ya Bill, and thanks for the encouragement (if your message was directed to me).

Right now, I'm maxed out at 116% MAF and 110% PE vs RPM (not sure hwo much leeway I have left there) in LS1 Edit. I've taken the car for a long drive to stabilize my settings, and I'll see where I'm at after I scan again. The great news is that my KS codes (P0327 and P0332) are gone. Yippee! I can only conclude that it was a tuning problem causing them as TeamZR1 (John) said all along. That guy's pretty sharp! Anyway, I still plan on going with a stock maf, and bigger injectors. Then I can finally get a "proper" tune. Anyway, continued good luck.

BillWS6Formula

Predator, just threw it out there as some general encouragement to any and all - I just remember how damn happy I was to cure the pinging and KR I was getting <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> . Sorry, can't help with the LS1 Edit numbers you posted - don't have any experience with that at all. I had enough trouble with just the two adjustments on MAFT *L*, I can't imagine tackling all the parameters LS1 Edit allows for!

Predator

I can't imagine it either Bill <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> , but I'm workin' on it <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> .

I'm happy cause I'm movin' in the right direction, but I'll be totally psyched when I get my baby tweaked <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> .

Chris99WS6PWTMET

For what its worth - I have also been chasing bad KR ever since I installed my TR224 and ASP pulley. The car is an 99 A4 (the lean years) with a LS6 intake, JBA's, no cats. I have spent the past 4 weeks chasing the KR. I even went so far as to put the stock pulley back on. Race gas, low timing, PE vs RPM in Edit - I mean EVERYTHING!! Then I found out we can actually check our injector pulse width with ATAP. So today I did some log runs with my PE vs RPM multiplier set at about 1.774 - my inj PW was over 25ms at WOT or 133% duty cycle above 6100 rpm!!! I couldnt believe it. So then I took the multiplier back to stock range (1.2403) and the inj PW came down to about 18.5ms at WOT at 6300 rpm (97% DS). Bottom line is the 26.4lb injectors dont appear to be keeping up with the mods. I'll be ordering bigger injectors tomorrow. Hope this gives you guys some insight on something to consider if you have not already done so. Good Luck.

Predator

Chris, you must have a 2000 also; I've got the same injectors, and I need to upgrade, too, as I mentioned earlier.

BTW, what injectors are you planning on getting? I've heard that you have to be careful, in choosing, because of the spray patterns. To find out what injectors I should get would be a great help. Thanks.

Predator

Sorry Chris, I see you have a '99. It must be 99s and 00s that got the small injectors.

Chris99WS6PWTMET

Predator, I'm going to make some phone calls tomorrow and get some info on new ones. I'm leaning towards SVO 30#'s. This time next year though we plan on making a custom turbo kit for it so I cant decide if I want to get the bigger ones now and tune in the drivability for NA use or just get the smaller ones now and buy big ones next year. I'll know tomorrow.

Predator

Chris, I'd be interested hearing which ones you get. Thanks.

dissonance

Well I hate to say it but I did a WOT run with my stock maf, stock lid and a fram air filter! Still 2.5kr!

Chris you talked about monitoring your injector plus width, how do you do that with just autotap and find out the percentage? I would not think a few bolt on’s would put me in the stage of upgrading to larger injectors.

Could a vacuum leak cause this? I would think it would show up at idle. With the stock stuff back on the car is a lot richer at part throttle, WOT is a little richer then before.

maybe i should try some more top engine cleaner?

<small>[ August 12, 2002, 01:34 PM: Message edited by: dissonance ]</small>

dissonance

I checked the duty cycle and at around 5700rpm's I was pushing 82% well with in limits

I think I am going to try and dump the hpp3 tuning.

Predator

I'll tell ya man, the challenges just keep coming--one after the other. I never imagined that JUST buying a Trans Am would lead to a lifetime of study. Hang in there!

I just ordered a stock maf to replace the ported one on there, and the Pace ZO6 maf on the shelf. I'm hoping that will solve all my problems, but I really know better. I can always try bigger injectors <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> .

Chris99WS6PWTMET

I'm gonna go with the SVO #30's after talking to Chris B. I am stumped also as to why I've got so much KR with just bolt on's and a cam. I've also talked to Paul @ Thunder and he's putting over 450 to the wheels on stock injectors with no problems. I checked fuel pressure at WOT tonight with a gauge and it looks goo through the RPM range so everything still seems to point to injectors.

Bottom line is I dont know what else it could be besides injectors. I've troubleshot almost everything I can think of. Just dont know why my injectors would be working so hard while other 99's seem to be doing fine with MUCH more RWHP than me. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />