Running Lean @WOT
11-26-2010, 07:54 PM
#1
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Running Lean @WOT 2000 LS1"
Xspower long tube headers with cats
LS6 intake manifold
Vararam
Borla catback
Powerbond udp 25%
fuel filter (oem)maybe 18months old
fuel pump (LPE stock replacement)
201k miles original unopened
Part throttle, cruise, and idle a/f ratio is 14.8-15.6
WOT is 15.9-16.2 on my aem wideband.
WOT on a dynojet is (take a look below)
I don't have any exhaust leaks and the maf couplers are tight.
after doing a wot pull on a closed road and letting off the gas the a/f went to 11.2-12.3 then back to 14.8-15.6.
The car does not hesitate, stall or crank long. Pulls clean from what my butt can feel. I do have a mail order tune, but Im not sure if anything else is causing the a/f to be so lean. I get no cel's.
Anyone think I may have something else going on with the car other than the mail order tune causing the lean a/f readings. Thanks
Xspower long tube headers with cats
LS6 intake manifold
Vararam
Borla catback
Powerbond udp 25%
fuel filter (oem)maybe 18months old
fuel pump (LPE stock replacement)
201k miles original unopened
Part throttle, cruise, and idle a/f ratio is 14.8-15.6
WOT is 15.9-16.2 on my aem wideband.
WOT on a dynojet is (take a look below)
I don't have any exhaust leaks and the maf couplers are tight.
after doing a wot pull on a closed road and letting off the gas the a/f went to 11.2-12.3 then back to 14.8-15.6.
The car does not hesitate, stall or crank long. Pulls clean from what my butt can feel. I do have a mail order tune, but Im not sure if anything else is causing the a/f to be so lean. I get no cel's.
Anyone think I may have something else going on with the car other than the mail order tune causing the lean a/f readings. Thanks
11-26-2010, 09:00 PM
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thanks for the replies, was thinking it wouldn't last this long with the mileage, but since it is Id like to keep it running its best. I will not be beating on it till I can get the tune reworked. Just wondered if anything might be worn out due to age like valve springs or maybe a fuel pressure regulator, but I doubt that also. Is it possible I got a 28lb injector tune but only using 26lber's.
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12-01-2010, 05:06 PM
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update: got the car back yesterday, the mail order tune I had just didn't pan out for me. **non-sponsor** I haven't been back to the dyno yet, but will post a comparison of my car between a mail order tune and a local tuner street tuned. I have to say, even though its cooler outside the car feels good in all gears now. The part throttle in low gears feel way better. I hope to at least make 345-355 whp. The A/F ratio wot now is @12.8-13.1 on the street where it should be. Nothing is wrong with the car no cel's or nothing. The injector duty cycle is at 86%. The changes were editing the maf table,enabling the stft's(was disabled), and overall about 20% fuel added in the PE area I think. I forgot exactly what he said but something similiar. Probably be another 2-3 weeks before I dyno again.
Last edited by Damian; 12-01-2010 at 11:29 PM.
12-01-2010, 10:44 PM
#9
It's easy to tune around a failing MAF if it's not recognized. I'm not saying that happened, but, as I said they report low. If you had to have 20% added, that's what I was referring to though. A mail order tuner would go out of business in no time if he sent out a bunch of 20% off files!
If it was that far out, the car should really pick up a bunch for ya.
If it was that far out, the car should really pick up a bunch for ya.
12-01-2010, 11:30 PM
#10
got the car back yesterday, the mail order tune I had just didn't pan out for me. **non-sponsor** I haven't been back to the dyno yet, but will post a comparison of my car between a mail order tune and a local tuner street tuned. I have to say, even though its cooler outside the car feels good in all gears now. The part throttle in low gears feel way better. I hope to at least make 345-355 whp. The A/F ratio wot now is @12.8-13.1 on the street where it should be. Nothing is wrong with the car no cel's or nothing. The injector duty cycle is at 86%. The changes were editing the maf table,enabling the stft's(was disabled), and overall about 20% fuel added in the PE area I think. I forgot exactly what he said but something similiar. Probably be another 2-3 weeks before I dyno again.
BTW, you can't pimp non-sponsor shops here so do not post his email address. THX
Last edited by Damian; 12-01-2010 at 11:42 PM.
12-02-2010, 07:54 PM
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results from retune This is still not a full dyno/street tune, but Im going to have to keep this tune for a good while. I feel this should be way safer than the previous. numbers= 355whp359wtq. It was about 45-50 degrees this evening.
