04 GTO V.E. issue
04-17-2010, 05:07 PM
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04 GTO V.E. issue My friend has an 04 GTO with MS3 and stage 2.5 5.3 heads. When i unplug the MAF to tune the trims, it won't hardly run at all. I even copied the table from my car which has an MS4 hoping that would get me in the ballpark, but still garbage. The STFT's are 40 and 50% everywhere. I even tried making those changes and it got better, but the VE values were like 150% in some cells so i know it's fucked up. I just put the stock table back for now. It runs great with the MAF. Smooth as silk and pulls hard. But without it you cant even pull out of the driveway. What am I missing?
04-17-2010, 05:18 PM
#2
My friend has an 04 GTO with MS3 and stage 2.5 5.3 heads. When i unplug the MAF to tune the trims, it won't hardly run at all. I even copied the table from my car which has an MS4 hoping that would get me in the ballpark, but still garbage. The STFT's are 40 and 50% everywhere. I even tried making those changes and it got better, but the VE values were like 150% in some cells so i know it's fucked up. I just put the stock table back for now. It runs great with the MAF. Smooth as silk and pulls hard. But without it you cant even pull out of the driveway. What am I missing?
04-17-2010, 05:34 PM
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Care to clarify which tables? When I did mine I tuned it using the STFT's.
I disabled long terms
unplugged the MAF
reset trims
Then i tried logging short terms with HP, but as i said it won't even run. This process has worked for me on F-Bods. I just figured something is different in the Goat ECM that i am not catching.
I disabled long terms
unplugged the MAF
reset trims
Then i tried logging short terms with HP, but as i said it won't even run. This process has worked for me on F-Bods. I just figured something is different in the Goat ECM that i am not catching.
04-17-2010, 06:17 PM
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04-18-2010, 03:43 PM
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Believe the 04 has a seperate IAT sensor...
Were the injectors changed? If so, was the tune changed for that?
Why are you are adding fuel in the idle VE cells? For that cam/heads they would definetly need leaned out from stock values to get it to idle.
The only way to tune it right is to put it in open loop and use a wideband to get it right... the VE and many other tables are likely so far off that it won't even idle. Tuning with narrow bands is not the right way to do it. Using trims to verify closed loop tuning after the wideband tune is the way it works.
Were the injectors changed? If so, was the tune changed for that?
Why are you are adding fuel in the idle VE cells? For that cam/heads they would definetly need leaned out from stock values to get it to idle.
The only way to tune it right is to put it in open loop and use a wideband to get it right... the VE and many other tables are likely so far off that it won't even idle. Tuning with narrow bands is not the right way to do it. Using trims to verify closed loop tuning after the wideband tune is the way it works.
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04-18-2010, 06:47 PM
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Does it have a good fuel pump in it? If not, you need one - no way a stock pump and injectors will support a MS3 and 2.5 heads...
Are you putting it in open loop to tune? I'll say it again - if you aren't putting it in open loop and tuning it with a wideband, you are doing it wrong. And that is probably why you aren't seeing the issue that is the root of it... I think you have a fuel problem from what little I can tell from the info here.
Are you putting it in open loop to tune? I'll say it again - if you aren't putting it in open loop and tuning it with a wideband, you are doing it wrong. And that is probably why you aren't seeing the issue that is the root of it... I think you have a fuel problem from what little I can tell from the info here.
04-18-2010, 08:24 PM
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Does it have a good fuel pump in it? If not, you need one - no way a stock pump and injectors will support a MS3 and 2.5 heads...
Are you putting it in open loop to tune? I'll say it again - if you aren't putting it in open loop and tuning it with a wideband, you are doing it wrong. And that is probably why you aren't seeing the issue that is the root of it... I think you have a fuel problem from what little I can tell from the info here.
Are you putting it in open loop to tune? I'll say it again - if you aren't putting it in open loop and tuning it with a wideband, you are doing it wrong. And that is probably why you aren't seeing the issue that is the root of it... I think you have a fuel problem from what little I can tell from the info here.
Narrow band or wide band doesn't really matter. The only way the car will even run half way decent without the MAF is if the VE values are jacked up into 150's or even higher. That is obviously not right. That is the issue at hand.
