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SVTPerformance's Chain of Restaurants
Tuning À la carte
Has your car ever forgotten its tune?
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<blockquote data-quote="Ted B" data-source="post: 16093263" data-attributes="member: 193850"><p>[USER=74327]@decipha[/USER] thanks man that's a good piece of info i didn't know, I'm an electrical engineer and I know the ECU stores its base tune on a NON VOLATILE single burn EPROM, thus unless the chip is damaged it can never return to stock. the tune, is actually flashed to a 2nd EPROM that is used for OEM upgrades to firmware, and or aftermarket tunes. If the ECU goes to look for the ECU firmware and cannot find it on the first secondary chip it will default to the primary chip. SO its possible, but EPROMS are solid state, old school and i've worked with them for years and unless you get a bad batch from china they are usually good forever.</p><p></p><p>But i have a returnless system on my 4v as i have the pressure regulator unit, I actually prime the fuel pump 2 times before starting, but i am indeed hearing the fuel pump prime and shut off for each turn of the key to acc so that's a good sign.</p><p></p><p>Rando question tho i adjusted the butterfly screw on my tb when i had the bad AIC installed and unplugged to allow the car to idle properly when cold, if its shut it has no way of getting air thus stalls right away. Now that I have a new AIC should I set it back to full close? I know the fuel rail regulator runs off of vacuum and at idle should be around 5psia (9 psi in vacuum), when WOT it should be ZERO on a NA car, and with a boosted car + whatever boost you are running increasing the fuel pressure 1psi per 1lb of boost. The secondary reason i opened the butterfly a bit was to stop having a pressure build up on the inlet side of the TB because that causes a slight pressure agest the plate and gives you the feeling of a jump in throttle when you crack the throttle to go.</p></blockquote><p></p>
[QUOTE="Ted B, post: 16093263, member: 193850"] [USER=74327]@decipha[/USER] thanks man that's a good piece of info i didn't know, I'm an electrical engineer and I know the ECU stores its base tune on a NON VOLATILE single burn EPROM, thus unless the chip is damaged it can never return to stock. the tune, is actually flashed to a 2nd EPROM that is used for OEM upgrades to firmware, and or aftermarket tunes. If the ECU goes to look for the ECU firmware and cannot find it on the first secondary chip it will default to the primary chip. SO its possible, but EPROMS are solid state, old school and i've worked with them for years and unless you get a bad batch from china they are usually good forever. But i have a returnless system on my 4v as i have the pressure regulator unit, I actually prime the fuel pump 2 times before starting, but i am indeed hearing the fuel pump prime and shut off for each turn of the key to acc so that's a good sign. Rando question tho i adjusted the butterfly screw on my tb when i had the bad AIC installed and unplugged to allow the car to idle properly when cold, if its shut it has no way of getting air thus stalls right away. Now that I have a new AIC should I set it back to full close? I know the fuel rail regulator runs off of vacuum and at idle should be around 5psia (9 psi in vacuum), when WOT it should be ZERO on a NA car, and with a boosted car + whatever boost you are running increasing the fuel pressure 1psi per 1lb of boost. The secondary reason i opened the butterfly a bit was to stop having a pressure build up on the inlet side of the TB because that causes a slight pressure agest the plate and gives you the feeling of a jump in throttle when you crack the throttle to go. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Has your car ever forgotten its tune?
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