Pray

iTrader: (7)

I have been getting the base tune on my 383 done while I have been breaking in the motor. I am around 500 miles now and the tune is spot on. I am going to have the car dyno tuned on Friday. My question is when I up grade to the 42lb injectors will I totaly have to retune the car? If I just enter the correct injector scaleing in the Injector Flow Rate table will the car automaticly adjust? Thanks in advance.

Brett

Billiumss

iTrader: (11)

Technically no, but it's always best to do your final tuning with ALL the parts on your car. If you don't get the scaling correct it will change your fueling for part throttle and WOT.

RedHardSupra

iTrader: (1)

if your car was tuned properly (aka not 'tune' by dicking with IFR values) then changing IFR table should not change anything but effective IPW. if it was hacked to begin with, then do yourself a favor and start from scratch.

Pray

iTrader: (7)

I entered the stock IFR from the 03 Z06 bin since I have an OS from an 03 and went from there. It has not been "hacked." I did the SD tune to +/- 3 and then hooked the MAF back up and tuned that to 0 to -3. I wanted the tune in the slight negative so when it enters PE the computer won't add any fuel except what is being commanded.

RedHard. I am going to use the IFR for the 42's that I got off your web site. And from what I am taking from what you wrote the tune should still be on correct?

Brett

RedHardSupra

iTrader: (1)

possibly... there's MANY ways to hack a tune, just ask any 'professionals'
there's a lot more to mess up than just IFR, but that's just the most popular method of doing it wrong.
post your tune, or email it to me (if you got my spreadsheet you got my email) and i'll take a look at it

ZL1Killa

iTrader: (17)

i went from the stock 28's to delphi/lucas 42#ers and just changed the IFR table..everything was fine

Pray

iTrader: (7)

Thanks. I will email it to you later. I am sure I jacked it up some where. It was my first attempt.

Pray

iTrader: (7)

Red Hard. I sent you an email to the address on the spread sheet. I enclosed the current tune. I am useing EFI live to tune.

Brett