What I can tell you is the Vette is a 99 with a Vortech S/C system running about 6-7LBs of boost. It has an LPE fuel pump and 60LB injectors for fuel upgrades.
The car runs great around town and the fuel trims are perfect. But on the dyno once the car transitions to WOT the air/fuel ratio goes straight to 18:1 and flat lines. It will not waiver whatsoever. The dyno operator did not stay in the gas but for a couple thousand RPM or so and the A/F never left 18:1.
Any ideas?
i am by NO means a good source for modifying a tune just so you know. more of another brain trying to help the situation.
does it do it as soon as you hit WOT? or is it more of a certain rpm that it does it at.
what tables did he modify to try to correct the situation?
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Can you post tune?
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ID 1000 Injectors
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Tripple Nozzle Meth
ACT Twin disk clutch
25# Boost
I've got the .hpt tune file but can't get it attached and upload for some reason. Is there something special you have to do?
are you logging your own WB02? or using the dynos WB??
Bader Norris
MEP Tuned
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I was using the dyno's W/B. We know it was not a problem with their equipment as the car before me and after me had the A/F dead on with earlier visits.
Post the tune and log.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
Is fuel pressure being monitored during the dyno run too?
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Yes fuel pressure was solid at 60PSI the entire time.
I've also now attached the tune file for the car.
Are you using 2.23? I can't open that in my VCM editor.
Ted/SkullV
2005 Redline CTS-V
Yes it is the beta 2.23.
How do you expect to get help if you are not providing us with any information?Originally Posted by WS6FirebirdTA00
Post your log file.
Have you done any WOT tuning with it? Have you tuned it at all? The MAF curve looks like a stock table with some offset, not good for a SC'd car....
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
I don't have a log file to post. My buddy told me it was deleted. I know the fuel trims have been dialed in via the MAF but not sure much beyond that.
Yes we were attempting to do some WOT tuning at the time. But each and every time the car transitioned to WOT, regardless of RPM, the AFR would go from 15:1 to 18:1 and lock in regardless of what was commanded in PE.
were you able to get a correct AFR reading when idling?
did you tune the car using a wideband?
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Yes at idle A/F is running 14.5 - 15:1 as well as part throttle. I was using the W/B at the dyno but the car itself also has a W/B and both pretty much agree.
I would like to see the tune file, but I can't open the beta file. I also have a 99 vette with the same mods and boost. Why are you using the beta software ? Get more help if you were not using the beta s/w.
1999 Corvette Coupe Stock Block. Vortech Si Supercharged, Siemens 60# Injectors, High flow FP, X-Pipe, Catback.
2005 Dodge Magnum 5.7 Stock except CAI
Post your log file.
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