S80 pro zetec runs lean at 5% throttle
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- Posts: 12
- Joined: Fri Apr 22, 2016 1:13 pm
- ECU Model: S80 Pro
- Distributor: Private sale
- Firmware Version: 52
S80 pro zetec runs lean at 5% throttle
Hi all , I'm running S80 pro ST170 zetec on hayabusa throttle bodies 3.9 bar fuel pressure , when ever I hold throttle at about 5% it runs lean 17 or off the scale but reads fine if I fully lift or accelerate anyone else had this problem...?
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- Joined: Thu Jul 28, 2011 4:10 am
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Re: S80 pro zetec runs lean at 5% throttle
It's not a problem, its mapped wrong
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- Posts: 12
- Joined: Fri Apr 22, 2016 1:13 pm
- ECU Model: S80 Pro
- Distributor: Private sale
- Firmware Version: 52
Re: S80 pro zetec runs lean at 5% throttle
Yeah I did think that but the figures all look reasonable and even closed loop won't bring it back to lambda target, so was wandering in anyone else encountered this problem , I was thinking maybe injector or fuel pressure
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Re: S80 pro zetec runs lean at 5% throttle
Closed loop has limits set on it regarding max and min corrections.
If you are using bike TB often you have set the initial break points very close like 0%, 2% 4%, 7% ect to overcome the fact that the butterflies have an aggressive closed position. Although the 'bussa ones are not that bad.
If you are using bike TB often you have set the initial break points very close like 0%, 2% 4%, 7% ect to overcome the fact that the butterflies have an aggressive closed position. Although the 'bussa ones are not that bad.
Re: S80 pro zetec runs lean at 5% throttle
What injectors fitted? Why the hike in fuel pressure - 3 bar is norm. Busa TB's are BIG! - maybe too big for a Zetec where 45mm is usually enough for 200+hp. @52mm the Busa ones are probably capable of 300+hp NA!
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- Posts: 12
- Joined: Fri Apr 22, 2016 1:13 pm
- ECU Model: S80 Pro
- Distributor: Private sale
- Firmware Version: 52
Re: S80 pro zetec runs lean at 5% throttle
Cheers Rob I understand what your saying and will try different settings , katana standard st injectors 315cc, the 3.9 was a figure I found on the net but will drop it to 3 , I went with the busa throttle bodes so if I decided to supercharge I wouldn't need to change them , but if there not going to work n/a I might have to
Re: S80 pro zetec runs lean at 5% throttle
Injectors ok - fuel pressure - check. My thinking behind the Busa TB's is due to the big hole, any minor opening of the throttle presents a larger proportion of air in - may only be marginal but as said above, tightening up the map resolution low down may help? If you use MAP instead of TPS for load may assist if available? Are you using fixed cam timing or movable - maybe its a cam timing Vs air speed issue?
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- Posts: 12
- Joined: Fri Apr 22, 2016 1:13 pm
- ECU Model: S80 Pro
- Distributor: Private sale
- Firmware Version: 52
Re: S80 pro zetec runs lean at 5% throttle
Yes mate I've got tps or map available so can try using map, still running the vvt runs well , thanks for the help you
Re: S80 pro zetec runs lean at 5% throttle
I know that it was a long time ago but have you solved your problem. I have similar problem, my car has zx12 throttle bodyes on a fiat 2l TC engine 8v (I know it is big for that engine, plan is to put 16v head, 8v is just for testing now and learning) and around 1000 -2500 rpm I have problem with lean mixture. I have TPS for load and increments are 2,4,6,9... it helped a little but there is still a problem.