Water Temp Compensation - Cold Start

s300 and SManager software questions & answers
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Quade
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Joined: Sat Jan 24, 2004 7:44 am

Water Temp Compensation - Cold Start

Post by Quade »

Which water temp compensation affects cold start? Open Loop Low, Open Loop High, Closed Loop Low, Closed Loop High? Assume closed loop enabled. Car starts fine when warm - just want to adjust the correct one.

As it is now when I give it a normal crank when cold it wont start in one. Crank again and it starts. I believe it need more fuel when starting. Yes if I hold the key long enough it would start cold the first time.

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Spunkster
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Post by Spunkster »

Don't change any of the compensations. Just change the cranking fuel trim plus or minus depending on what helps the car start better.

Quade
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Joined: Sat Jan 24, 2004 7:44 am

Post by Quade »

I thought about that but afterwards I was thinking that the cranking fuel trim would have an effect when it's cold as well as when it's warm and starting fine. I only want the adjustment to affect cold start. Will try it however.

Quade
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Joined: Sat Jan 24, 2004 7:44 am

Post by Quade »

Had to add as much as 20% for cranking fuel trim to get a good start when cold. Is this normal or is it because my injectors are 1000cc and lazy? Cranking when warm is still fine. Thanks.

kinetics
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Joined: Tue Jun 09, 2009 8:47 am

Post by kinetics »

Part of that is because you still have unburnt fuel in the cylinders when it's still warm.
As for cold, I had to add almost 80% for it to start on my stroked E85 B16A, and it still takes a few seconds for it to actually start, if it's a cold start.

allm0t0rGSR
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COLD START

Post by allm0t0rGSR »

IS IT NORMAL TO RICH UP TO 12.6 AFR AT COLD START... BECAUSE MINE EVERYTIME I START MY CAR IN THE MORNING IT GOES TO 13.9 AFR A COUPLE SECONDS IT GOES TO 12.6 AND THE AFTER 3-4 MINS IT GOES TO 13.5 UNTIL THE CAR IS FULLY WARM? IS THIS NORMAL THAT RICH IN COLD START IN THE MORNING

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Spunkster
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Post by Spunkster »

This is normal

allm0t0rGSR
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Post by allm0t0rGSR »

thanks alot

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