Quote:
Originally Posted by Compelica
I've been looking around for the answer to a question that doesn't seem to come up. If getting fuel trims laid out correctly is so important, which the car needs driving for some time to learn at four rev ranges in CL - how does any OFT tuner accomplish any work within an acceptable time? For example, if I was working on ignition for 98 RON I would have to:
1. Make change in tune.
2. Flash tune to car.
3. Wait for AVCS to turn on.
4. Wait for LTFTs.
5. Do pull, monitor IAM and knock parameters.
6. Rinse and repeat.
Even if a person is on a dyno, he/she wouldn't have all day for step 3 and 4 - I know LTFTs can be turned off but you wouldn't be testing in the proper scenario eventually.
Is there something that I'm missing here?
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On a dyno you have realtime AFR and you use the fuel trims in closed loop and fuel error in open loop to get the system setup correctly. You can hold the car in certain load scenarios. Thing is, on a dyno if only an hour you would spend that setting up the power range and probably just checking some closed loops regions so it was close enough to not change the open loop portions of the map.
You should still do road testing as the final part of any mapping session.