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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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Tuning Question
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Mon, 06 December 2004 07:07
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Just wondering what characteristic of a ECU map causes the car to shoot flames on hard shifts at high RPM.
It cant be good for the cat can it? 
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Tuning Question
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Mon, 06 December 2004 07:26
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waste spark and excessive fueling will do that
basically when you shut your throttle fuel is still going in and is unburnt, and because the GZE coil packs are "waste spark" config (fires on both compression and exhaust strokes) the excess unburnt fuel is ignited as the exhaust is pushed out....
well that's what i would think anywayy....
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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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Re: Tuning Question
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Mon, 06 December 2004 07:29
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Thats a pretty obvious one , but I was also thinking of the possibility of the timing jumping all the way down when you shift and throwing still combusting material out into the exhuast.
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Location:
NSW, East Coast
Registered:
July 2003
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Re: Tuning Question
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Mon, 06 December 2004 07:30
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| THE WITZL wrote on Mon, 06 December 2004 18:26 |
waste spark and excessive fueling will do that
basically when you shut your throttle fuel is still going in and is unburnt, and because the GZE coil packs are "waste spark" config (fires on both compression and exhaust strokes) the excess unburnt fuel is ignited as the exhaust is pushed out....
well that's what i would think anywayy....
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Sounds about right, over fueling is usually the cause of flames out the exhaust, or very poor igniting in the cylinder.
Cheers
Steve
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Location:
Brisbane
Registered:
February 2003
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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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Re: Tuning Question
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Mon, 06 December 2004 07:41
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Haha , actually my car runs very well and does not shoot flames , but in its dyno tuning process I do remember seeing it throw alot of flame on the run down ( something retarded like a 3.11ms pulse on a -80kpa point ) but yeah I was what else caused flames like this.
Note - I have no intention of making my car shot fully sik flames , but I am learning about different portions of my tuning ecu maps.
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Club Member
Location:
sydney
Registered:
May 2002
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Re: Tuning Question
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Mon, 06 December 2004 07:59
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3.11ms is pretty high for idle down.. i just readjusted mine down to 1.4 to 1.2ms
do you use an overun fuel cut?? maybe youve accidentally turned it off or changed a setting?
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Location:
The Eastwood MASSIVE !
Registered:
May 2003
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