What's better? VAFC II or 02-03 ECU
02-13-2007, 12:09 PM
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What's better? VAFC II or 02-03 ECU
Which would you prefer for an 01 s2000?
obviously you get more peak power with the vafc, but is the midrange comparable between the two?
obviously you get more peak power with the vafc, but is the midrange comparable between the two?
02-13-2007, 06:50 PM
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Originally Posted by s2kBryan916,Feb 13 2007, 04:12 PM
The 02-03 ecu will keep its settings.
The vafc will loose its part throttle settings over time due to the ecu re learning its ratios.
The vafc will loose its part throttle settings over time due to the ecu re learning its ratios.
AEM EMS is the best however...but is stand alone, more expesive to buy and tune, but the gains are much higher.
02-13-2007, 09:51 PM
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Originally Posted by s2kBryan916,Feb 13 2007, 01:12 PM
The 02-03 ecu will keep its settings.
The vafc will loose its part throttle settings over time due to the ecu re learning its ratios.
just some food for thought
The vafc will loose its part throttle settings over time due to the ecu re learning its ratios.
just some food for thought
02-14-2007, 03:14 AM
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Originally Posted by Ztopgun28,Feb 13 2007, 10:51 PM
what u mean?
The learning mode comes into play with the closed loop fuel maps, where it'll alter the entire map based on the engine running too lean or too rich. This is why VAFCs don't create power throughout the entire powerband when driving normally. Under WOT, the engineers dump fuel into the system to make sure the system runs too lean, too lean = boom, so they would rather be safe. Since there is no ECU-learning or adapting in the open loop mode, the VAFC can shine because you can tune the car better.
Make sense?
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02-14-2007, 05:30 AM
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Originally Posted by decker,Feb 14 2007, 04:14 AM
There are two modes for fuel in ECU's. The close loop mode where the ecu runs on pre-set fuel maps. And Open loop (or WideOpenThrottle) where the engine guesses at how much fuel is used by taking readings from the 02 sensors.
The learning mode comes into play with the closed loop fuel maps, where it'll alter the entire map based on the engine running too lean or too rich. This is why VAFCs don't create power throughout the entire powerband when driving normally. Under WOT, the engineers dump fuel into the system to make sure the system runs too lean, too lean = boom, so they would rather be safe. Since there is no ECU-learning or adapting in the open loop mode, the VAFC can shine because you can tune the car better.
Make sense?
The learning mode comes into play with the closed loop fuel maps, where it'll alter the entire map based on the engine running too lean or too rich. This is why VAFCs don't create power throughout the entire powerband when driving normally. Under WOT, the engineers dump fuel into the system to make sure the system runs too lean, too lean = boom, so they would rather be safe. Since there is no ECU-learning or adapting in the open loop mode, the VAFC can shine because you can tune the car better.
Make sense?
02-14-2007, 11:37 AM
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Originally Posted by Emil St-Hilaire,Feb 14 2007, 06:10 AM
Greedy Ultimate E-Manage.!!!
still looking it over....seems like a good middle ground. but i haven't seen much usage with it yet.