Not scaling injectors..and fail emissions
Oct 9, 2009, 09:33 PM
#1
Not scaling injectors..and fail emissions
Ok a few weeks ago I checked my friends rom in his evo 8...
And found out his injectors (780) weren't scaled,, But what the guy did was
lean out the fuel maps,,,,
Ok my question is will this make him fail a emission test....
THANKS,,,,
And found out his injectors (780) weren't scaled,, But what the guy did was
lean out the fuel maps,,,,
Ok my question is will this make him fail a emission test....
THANKS,,,,
Oct 9, 2009, 10:05 PM
#2
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Most likely, yes, the map is for WOT the ECU attempts to use the feedback from the front o2 sensor to control the injectors using the STFT and LTFT (short term fuel trim and Long term fuel trim). If the injectors weren't properly scaled then most likely those trims are maxed out and the car is still running rich at idle and during closed loop cruise. This will cause it to fail the emissions check if they do the sniffer test (put the sensor in your tail pipe). Since you clearly have a tactrix cable if you pulled his ROM as you said. Then log his STFT and LTFT and see where they are. Read the ECU flash section of this forum for directions on how to scale them properly then re-tune. Or contact Mellon or one of the other highly reputable tuners on this forum.
Josh
Josh
Oct 9, 2009, 10:13 PM
#3
He bought the car that way,,,, All they did was lean out the fuel trims,,,,
scaling was left untouched,,,, (stock) and the car had 780's installed,,
scaling was left untouched,,,, (stock) and the car had 780's installed,,
Most likely, yes, the map is for WOT the ECU attempts to use the feedback from the front o2 sensor to control the injectors using the STFT and LTFT (short term fuel trim and Long term fuel trim). If the injectors weren't properly scaled then most likely those trims are maxed out and the car is still running rich at idle and during closed loop cruise. This will cause it to fail the emissions check if they do the sniffer test (put the sensor in your tail pipe). Since you clearly have a tactrix cable if you pulled his ROM as you said. Then log his STFT and LTFT and see where they are. Read the ECU flash section of this forum for directions on how to scale them properly then re-tune. Or contact Mellon or one of the other highly reputable tuners on this forum.
Josh
Josh
Last edited by ant_turbo; Oct 10, 2009 at 12:07 AM.
Oct 10, 2009, 12:33 AM
#6
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Josh
Oct 10, 2009, 12:56 AM
#7
They never touched the latencies .... What I am going to do is flash it with a stock rom,,,,, Then hav him go back to REF STATION and retest...
Then put back his 780's and all his mods back on,,,take him to RRE for a tune,,,
Then put back his 780's and all his mods back on,,,take him to RRE for a tune,,,
If he put the stock injectors back in it I would put the stock latencies and sceraling back in the ROM and go with a stock fuel map until he passes emissions then get it tuned properly. I would read the ECU flash forum on here to gain as much knowledge as you can, if you want it done now I would highly recommend taking it to a reputable tuner or contacting Mellon as I said earlier. Don't drive it hard until it gets fixed properly.
Josh
Josh
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