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Location:
Toowoomba
Registered:
May 2002
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 Admitting defeat: ECU Tuning questiongs
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Wed, 12 February 2003 00:20
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Hi, I need to know some good tips/tricks/techniqes for tuning my Microtech ECU. I did get a dyno tune but due to a few problems it asn't completed properly. I am going to upgrade the ECU with the 3D and Matrix mods soon so this will be just to get me by til then.
Pump Values: This is probably what give me the most headaches. I'm not sure what I should be changing when. Do I change the amount or duration or the pump (has pump 1 for <2000rpm and pump2 >2000rpm). And I'm not sure whether the pump trigger value is how much fuel to add when the pump is triggered OR how much change in something is required to trigger the pump???
Load: Most of these are fairly close so just a couple of pointers. Living high up (toowoomba) I can't get 00" vacume and there is no adjustment on the ECU so I try to get around it using WOT values and making the 00" point a little richer than normal.
WOT: Same as above, seems ok but some pointers would be good. There are afew little hickups in the acceleration and it feels very boggy below 3000rpm (non-boosted car BTW).
A/F Ratios: Ok 14.7 is supposed to be spot on but is this the case all the time? Should I aim to have exactly 14.7 at ALL times or just on cruise (imagine a perfect world  ). Should it be say 13 under heavy acceleration or something else??? Also is there anyway of checking my A/F sensor to make sure it is reading correctly, apparently the dyno showed different values at times but the sensor for that is all the way at the back of the car.
Water/Air/Crank: These have me a little confused. How much extra fuel is normally added at different points? I can get it to start ok, but not as good as factory EFI cars and it seems to run good all the time EXCEPT for about 2-3mins after I start it, after that I could probably have no extra fuel and it would run ok.
Other problems: There are afew hickups. if for example I bring the revs up to say 3000-4000rpm then push the clutch in and let the throttle off, the revs drop to about 600rpm instead of my ussualy 850rom idle, is this normal or should I be correcting something. The car launches very poorly and has little power below 2000rpm and not much better til 3000rpm, then it realy pcks up (close to stock motor, standard cams). And it doesn't seem to rev as high or as freely as it did with the carbs. Fuel consumption is better but still poor.
Most of these things would be quickly cleared up with the 3D mod (rpm * load = inj. timing instead of load = inj. timing + WOT and CRS maps). But I won't be getting that for a couple of weeks and I will still need to know how to adjust alot of these things.
NOTE: The motor is an 18r-gu with EFI and electronic ingnition conversion, microtech mt-4, standard injectors and fuel pressure, head has been cleaned up afew times so very slight amount has been shaved off (enough to requre slight cam adjustment but this should not be a problem) and a mild port job (cleaed dags and slight mods to the shape). Thats about all.
Sorry for such a very long post but if I don't ask I wil never know. Even just afew bits and pieces from people who know what they are doing would be a great help, or some nice web links would be great aswell. Thanks
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