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NOTORIOUS VR
Joined: 07 Feb 2006
Posts: 95
Location: Toronto, Canada
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 Posted: Sun Jul 08, 2007 9:23 am Post subject: Stupid Haltech... Small Problem/Big Annoyance |
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OK so here it is... same friend with an E6K on his Porsche 928... There's this strange thing that it does under light cruising...
basically, if you are cruising (30% TPS or under) all of a sudden the car will jerk and act like it just misfires, but the WBO2 go RICH instead of lean.
So one night I decided to just stare at the Engine Data Page where it show's all the variables to see if I could find a malfunctioning sensor causing this.
NOTHING was out of whack EXCEPT for the injector pulse width... it would be sitting at about 0.982ish (high way speeds), and all of a sudden it would jump up to 1.152 or so and drop back down to .9 area.
None of the other sensors even budged (IAT, CLT, TPS, MAP, etc)
The TPS was swapped out, and the IAT was changed out and put in a different location.
Now that I think of it, maybe the injectors are just too big? .9 of a ms is a little low I know, and the car never does it under full load (ie. higher injection times). Does anyone know how low an E6K can go for injector ms?
I think they are 8x 780 or 880 cc injectors.
Any ideas? As this is really been a long ongoing problem and I'd like to get this resolved. |
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crispeed
Joined: 03 Dec 2003
Posts: 71
Location: Miami Fl.
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| Posted: Sun Jul 08, 2007 10:07 am Post subject: |
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It could be a combination of a couple of things. Without seeing the actual map it's kind of difficult to give an accurate opinion.
Here's a couple of things to check though.
Since you said it's an intermittent problem then check to see if the 'Battery Correction' map is not adding fuel at the same time when this occurs. It might be due to something placing a heavy electrical load on the system like when the cooling fan is cycling etc.
Also if you're confident that all your correction maps are in order then most likely it can be the 'Throttle Pump Enrichment' map. Just as an experiment increase the TPS deadband to say about 5% and see what happens. Most of the times it's the throttle pump over enrichening the mixture due to small movements from the tps. The E6-K does not show throttle enrichment on the data page like the newer ecu's do. It only shows up like the way you describe above on the data page.
_________________
CRISPEED 87 Rx-7 9.204@150.47mph
TRAVIESO RACING Rx-3 10.04@130.86mph ALL MOTOR
AWD MOTORSPORTS EVO8 RS 8.98@156mph E85
AWD MOTORSPORTS EVO8 GSR 8.75@166mph E85
SHAUN EVO9 9.75@144mph E85
MOST WANTED EVO9 9.05@157mph E85
SFT RACING MKIV SUPRA 7.84@179mph
CHARLES/RAW 2JZ S2000 7.77@194mph E98
AD TURBO 2JZ S2000 7.81@178mph E85 Drag Radial
SANDOR 2JZ 240 8.86@159mph E85
JJRBOOST S14 2JZ 7.6613@176mph E85
NEIL AUTOWORKS 8.32@172mph E85
D&D AUTO R32 SKYLINE 8.02@170mph E85
BIG DADDY PERFORMANCE SUPRA 7.60@186mph E98 |
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NOTORIOUS VR
Joined: 07 Feb 2006
Posts: 95
Location: Toronto, Canada
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| Posted: Sun Jul 08, 2007 10:14 am Post subject: |
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| crispeed wrote: | It could be a combination of a couple of things. Without seeing the actual map it's kind of difficult to give an accurate opinion.
Here's a couple of things to check though.
Since you said it's an intermittent problem then check to see if the 'Battery Correction' map is not adding fuel at the same time when this occurs. It might be due to something placing a heavy electrical load on the system like when the cooling fan is cycling etc.
Also if you're confident that all your correction maps are in order then most likely it can be the 'Throttle Pump Enrichment' map. Just as an experiment increase the TPS deadband to say about 5% and see what happens. Most of the times it's the throttle pump over enrichening the mixture due to small movements from the tps. The E6-K does not show throttle enrichment on the data page like the newer ecu's do. It only shows up like the way you describe above on the data page. |
Out of all the things you've said, the only thing that I can think of that is off is the Battery Coorection map... but even then I'm quite sure that that isn't the issue, because the cooling fan is on all the time on top of that we were at highway speeds on a steady cruise. and at that point there is no drastic change in voltage and can pretty much guarantee that.
The throttle pump maps I've already played around with and they don't help all too much.
I just have a feeling that the injectors are too big for the haltech...
I mean at cruising highway speeds (approx 120 km/h/75 mph) the injector pulsewidth is .9, I haven't even bothered to check what it is at idle I think low .8's and even then, when I'm tuning the car, one press of the arrow up or down makes drastic changes to the AFR's... |
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crispeed
Joined: 03 Dec 2003
Posts: 71
Location: Miami Fl.
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| Posted: Sun Jul 08, 2007 12:01 pm Post subject: |
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Still try increasing the TPS deadband to 5%.
If you're were experiencing the same problem and the injector pulsewidth on the data page was not changing then I would more lean towards a resolution/injector problem which by the way you can work around to get better control. The main fuel map will only allow you to go plus or minus in a certain amount of pulsewidth change. You could use another correction map to change the mixture by % to get a better resolution.
You could try fuel pressure change but that would effect the entire tuneup though.
What AFR's are you trying to acheive during cruise and idle?
_________________
CRISPEED 87 Rx-7 9.204@150.47mph
TRAVIESO RACING Rx-3 10.04@130.86mph ALL MOTOR
AWD MOTORSPORTS EVO8 RS 8.98@156mph E85
AWD MOTORSPORTS EVO8 GSR 8.75@166mph E85
SHAUN EVO9 9.75@144mph E85
MOST WANTED EVO9 9.05@157mph E85
SFT RACING MKIV SUPRA 7.84@179mph
CHARLES/RAW 2JZ S2000 7.77@194mph E98
AD TURBO 2JZ S2000 7.81@178mph E85 Drag Radial
SANDOR 2JZ 240 8.86@159mph E85
JJRBOOST S14 2JZ 7.6613@176mph E85
NEIL AUTOWORKS 8.32@172mph E85
D&D AUTO R32 SKYLINE 8.02@170mph E85
BIG DADDY PERFORMANCE SUPRA 7.60@186mph E98 |
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NOTORIOUS VR
Joined: 07 Feb 2006
Posts: 95
Location: Toronto, Canada
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| Posted: Sun Jul 08, 2007 12:04 pm Post subject: |
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| crispeed wrote: | Still try increasing the TPS deadband to 5%.
If you're were experiencing the same problem and the injector pulsewidth on the data page was not changing then I would more lean towards a resolution/injector problem which by the way you can work around to get better control. The main fuel map will only allow you to go plus or minus in a certain amount of pulsewidth change. You could use another correction map to change the mixture by % to get a better resolution.
You could try fuel pressure change but that would effect the entire tuneup though.
What AFR's are you trying to acheive during cruise and idle? |
Where abouts do I find that deadband option? I don't think I've come across it yet (or at least I don't think so).
I'd rather not reduce fuel pressure, what correction map are you talking about btw?
AFR's @ idle I aim for 13.8-14.0 as this motor doesn't like going too lean. Lean/Light cruise around the same AFR 13.5-14.0.... |
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crispeed
Joined: 03 Dec 2003
Posts: 71
Location: Miami Fl.
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| Posted: Sun Jul 08, 2007 2:19 pm Post subject: |
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It's in the 'Fuel Setup' menu.
_________________
CRISPEED 87 Rx-7 9.204@150.47mph
TRAVIESO RACING Rx-3 10.04@130.86mph ALL MOTOR
AWD MOTORSPORTS EVO8 RS 8.98@156mph E85
AWD MOTORSPORTS EVO8 GSR 8.75@166mph E85
SHAUN EVO9 9.75@144mph E85
MOST WANTED EVO9 9.05@157mph E85
SFT RACING MKIV SUPRA 7.84@179mph
CHARLES/RAW 2JZ S2000 7.77@194mph E98
AD TURBO 2JZ S2000 7.81@178mph E85 Drag Radial
SANDOR 2JZ 240 8.86@159mph E85
JJRBOOST S14 2JZ 7.6613@176mph E85
NEIL AUTOWORKS 8.32@172mph E85
D&D AUTO R32 SKYLINE 8.02@170mph E85
BIG DADDY PERFORMANCE SUPRA 7.60@186mph E98 |
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Grocerius Maximus
Joined: 02 Apr 2006
Posts: 169
Location: McKinney TX USA
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| Posted: Fri Jul 11, 2008 8:52 am Post subject: |
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| Sounds more like an intermittent short in the vehicle wiring, alternator etc. log battery voltage at a high rate and see if it takes a dip when this happens. |
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