eb02z06

iTrader: (18)

I plugged in Redhardsupra's injecter scaling spreadsheet. Got my values. fired the car up did some logs and the car was never in the negative. Anyway to make a long story short-had to scale the injectors almost 26%( or mulitpy by .74) to get an average value of -5 to -8 for LTFTm's. This on a 02 Z06 with a A&A P1SC -FMIC, 224/230 cam, headers, 317 heads. Still running factory 1 bar and I was told by almost anyone who tunes blower cars to leave the VE and MAF alone until I go 2 bar-does this sound right?

Moparnos (The SLP Guy)

iTrader: (55)

ifr table should not be used to adjust your trims.

Zombie

iTrader: (2)

says who?

Moparnos (The SLP Guy)

iTrader: (55)

ifr is to set your injectors. do YOU know what the ve is for??

eb02z06

iTrader: (18)

This is where it gets real tricky-years ago with edit and all my head and cam cars all we did is scale the ifr table and just play with the ve on the low end to cure hot starts. Now everyone is saying to adjust the ve via wideband then scale the maf. then others are saying if you are not planning to go 2bar just yet leave the ve and maf alone-what gives-I'm going crazy?

eb02z06

iTrader: (18)

Slowhawk-please help!

MIGHTYMOUSE

iTrader: (59)

ifr = injector flowrate table
if you go from one injector to another then the injector flowrate would change, and therefore the injector flowrate table should be adjusted. i have never had a problem tuning larger injectors in with this table.

also if your fuel pressure is changed i adjust in the same table

vortech- check your maf table to make sure the 'end' is fixed to continue up instead of flatline.

Moparnos (The SLP Guy)

iTrader: (55)

ifr table is just to tune in your injectors/pressure not to adjust trims. ve table is what you use to adjust the trims and yes a wideband setup would benefit you in doing this. are you using edit or hptuners?

eb02z06

iTrader: (18)

Mightymouse-my MAF table is still stock, at 12000 it's showing 443.60 but from the start point it progressively get's higher. Moparnos I have wideband and I'm using HPtuners latest MPVI bost with version 2.1.10. If you look at one of the help files in HP it tells you how to do a VE wideband tune then calibrate the Maf. I was told this does not apply to FI-this was coming from the guy that did the write up.

Slowhawk

iTrader: (12)

Don't worry,you can use the IFR to tune in the L-terms.FI cars can get screwy because the MA throw's the air flow way off due to the blower.Doing the IFR is like doing the VE and makes it easier. When you go 2bar you just scale the injector's to 60lber's and tune the VE.

eb02z06

iTrader: (18)

Slowhawk, Mightymouse-thank you guys for clearing this up for me-much appreciated!

onfire

iTrader: (17)

For the people that don't like to touch the IFR table, I have one question.

How do we know the "scaled" IFR from the Internet formula is correct? Not being harsh, but I've never been convinced the IFR's we use are correct.

eb02z06

iTrader: (18)

That is a really good question. I'll tell you this though-any car that I have tuned be it 30lb inj 42 or 60-the fuel trims are never right. I've never touched the MAF-just the VE up to 1200 rpm for a cam on any of my H/C combo's. All the car's made great power and felt great on the street too. Not saying it's right but that's how it was done before all the VE MAF scaling came out.

MIGHTYMOUSE

iTrader: (59)

you dont, the only way to know that you get it right is to drive them whatever number makes the l trims back to where they were before the swap