When the motor was cutting out the power completely and then coming right back on-line after a couple seconds, I figured it must be the distributor as this is a common problem with integras.
I installed a brand new Distributor King distributor, new Acura wires, and new plugs. It runs fine on the street, but after about 4 laps or so at VIR, same thing happens. This has happened before at my last PDX.
All power is lost and the check engine light stays on and is solid. Not other lights in the dash come on. If I lift throttle and get back on it, then all power is completely restored. The CEL does not stay on.
I was able to data-log one of those sessions. There are several recordings, not sure why, so I will post them all. I was not able to find a check engine in either of the recordings browsing through them, but perhaps I missed something.
Could a MAP sensor or perhaps a TPS sensor cause this?
Motor cuts all power on track conditions and comes back.....
Motor cuts all power on track conditions and comes back.....
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planetspeed
- Posts: 72
- Joined: Sat Jun 30, 2007 8:15 am
I think its not an ecu problem..are you running turbo or allmotor?either way, check your fuel system.sounds like you have fuel starvation at the point where your power loss occurs..if you're running turbo, check the map limit vs actual boost you're running at acceleration or when your power-loss problem occurs..Once you hit the map limit the ecu will try to suppress power to prevent overboosting..hope it helps.Goodluck!
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planetspeed
- Posts: 72
- Joined: Sat Jun 30, 2007 8:15 am
Try to set the boost cut 1-2psi more, say 11psi.It could be that the ecu has a map limit softcut at 2psi before your present boostcut of 9psi.I have used some aftermarket ecu's before having a soft map limiting feature at "x"Psi's before preset boost(hardcut)..you may check your boost gauge lines for leaks which may mislead your boost readings to be low(in reality,you're boosting higher)..Hope it helps..Goodluck!
Perhaps you can help me understand the soft cut a little better as I have never heard of that before.
Are you saying that perhaps the map was not tuned for a certain amount of boost?
I started with the Hondata base map for a JRSC type r with 440 injectors at 9 psi and basically leaned out the fuel some. The timing was perfect for me everywhere.
I do not have a boost gauge. What I did was take a datalog from the session on the track when the motor was cutting out, and then went through it peice by peice to try and find some fishy readings. I wrote down the highest MAP sensor readings and converted it to psi. I also did that for TPS and coolant temp.
Sort of weird, but the TPS did read 101% a few times.
Are you saying that perhaps the map was not tuned for a certain amount of boost?
I started with the Hondata base map for a JRSC type r with 440 injectors at 9 psi and basically leaned out the fuel some. The timing was perfect for me everywhere.
I do not have a boost gauge. What I did was take a datalog from the session on the track when the motor was cutting out, and then went through it peice by peice to try and find some fishy readings. I wrote down the highest MAP sensor readings and converted it to psi. I also did that for TPS and coolant temp.
Sort of weird, but the TPS did read 101% a few times.
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planetspeed
- Posts: 72
- Joined: Sat Jun 30, 2007 8:15 am
soft map limiting feature as the term implies that the ecu will start to control MAP slowly in a ramp fashion..simulate it like a variable light dimmer switch in our living rooms where you could dim the lights rather than in an ON/OFF fashion..I learned tuning with reading mechanical gauges when datalogging was just available on $3k equipments..with the advent of affordable datalogging(e.g. Hondata), it made tuning not just easier but more accurate thus equating to less engine blowups..