Toymods Car Club Inc: Tech & Conversions => 1JZ: AF ratios too rich

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celicamad
Forums Junkie

Location:
newcastle
Registered:
June 2002

Re: 1JZ: AF ratios too rich	Mon, 07 October 2002 04:19

a couple of things 1. It IS common with factory ecu's for the mixture to become rich.This is often caused by an EVENT such as detonation repeatably occurring .the knock sensor detects this then dumps in more fuel to try to stop this happenning .Many times i have reset my ECU and had a noticable power increase. So reset the ecu. Particularly after making a big change like the intercooler The engine characteristics will change quite a bit it is possible that you will notice a difference.Having said that the power figure is a little low average is about 179 RWKW but the mixtures seem about right (for stock) ive seen 5 or so AF runs that look about the same . i agree with all above the first dyno run was way too hot it all comes down to who is using the dyno on the day .At dyno comps they usually quote HOLD power not PEAK . 2. secondly i had a VERY similar Result recently myself .i have a dyno plus and do power runs and 0-100 etc all the time . Power dropped,0-100 dropped peak boost was the same . i found that a power steering vacuum hose had come off but because it was before the throttle body idle was not effected .i replaced it and power was restored as was performance a week later same problem so i tightened all my Intercooler hoses .power came back peak boost was the same . The reason for this the air leak is enough to limit the amount of air getting to the intake but not enough to effect peak boost The wastegate will still open at the same point of boost .So the turbo's just had to work harder An aftermarket intercooler should make about 10-5 RWKW .CHECK ALL THOSE HOSES [Report message to a moderator]

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