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StinkyZ
Joined: 10 Dec 2003
Posts: 111
Location: Tampa, Fl
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 Posted: Tue Feb 17, 2004 3:42 pm Post subject: Running lean for a second when I nail the gas |
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| I've got a z31 that I reprogrammed to accept TT injectors. Anyway its all up and running quite well except for when I hit the gas hard. It will accelerate go fine for a second, the afr will jump lean and the engine will hesitate for a second, and then the afr comes back to normal and the car keeps accelerating. Feels like it might be doing it when the car stops using the o2 sensor. Any ideas, suggestions? Other than the acceleratiion problem the car runs great. I know its common to run lean for a second while the ecu catches up but this is more than it should be. |
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mattback
Joined: 14 Feb 2004
Posts: 19
Location: secret services
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| Posted: Tue Feb 17, 2004 5:44 pm Post subject: |
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it's not very normal for the ecu to run lean at all.
stinky, would you be interested in coming up and using our dyno to tune your car and swap ideas and what not??
give me a call @ the shop
727 571 1450
mattback
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mattback |
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StinkyZ
Joined: 10 Dec 2003
Posts: 111
Location: Tampa, Fl
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| Posted: Tue Feb 17, 2004 10:50 pm Post subject: |
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| I'm up for it as long as you guys arent going to charge me. Hit me up on AIM when you get a chance. my sn is Bryantt16. |
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TheSlimOne
Joined: 10 Jan 2004
Posts: 92
Location: Fort Worth
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| Posted: Wed Feb 18, 2004 1:20 pm Post subject: |
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Hey matt. can I come and have you dyno tune my car for free too>  |
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mattback
Joined: 14 Feb 2004
Posts: 19
Location: secret services
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| Posted: Wed Feb 18, 2004 1:48 pm Post subject: |
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use of the dyno is not going to be free. but tips on tuning will be complementary
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mattback |
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StinkyZ
Joined: 10 Dec 2003
Posts: 111
Location: Tampa, Fl
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| Posted: Thu Feb 19, 2004 4:58 pm Post subject: |
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| I'm a bit poor to pay for dyno time and I already have a wideband kit installed and logging a bunch of stuff. Matt, do you ever got to the z meets on saturday night? I'm probably going out saturday night and also to the meet at fort desoto this sunday. Let me know if youre going and we can meet up. |
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J30_VG33ET
Joined: 15 Jan 2004
Posts: 14
Location: Southern CA
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| Posted: Wed Feb 25, 2004 7:52 pm Post subject: hesitation |
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Sounds like a lack of acceleration enrichment. Not sure if the ECCS has that function, but typically there is a deltaTPS enrichment to smooth out transients. If that table is available, and you know where it is, try free-revving the engine (in neutral) and messing with the enrichment level. Since the engine won't ever accelerate much faster than it does in neutral, that's the best place to do the tuning.
MK |
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