Change VE, or IFR when LTFT = 25
08-02-2006, 08:19 PM
#21
TECH Resident
Thread Starter
Red, How do you get 34.6 IFR? The sticky for "Tuning SVO injectors" says they are rated at 40psi. When I plug that in for a 30 injector I get 36.12 for the first value. Are you using a different fuel pressure rating for SVO injectors.
08-02-2006, 08:26 PM
#22
well, there's been a lot of discussion over this, and i myself have found 3 very legit looking documents with 3 different rated pressures for it, 39.15, 40, and 43.5.
I personally use 43.5. not because some doc says so, but because I tuned my car perfect before i changed the injectors, used the 43.5 in the spreadsheet and the trims didnt' change, which is the expected behavior of when you're spraying the perfectly proportioned amount of fuel, just with a bigger 'headroom'
you dont have that advantage of starting from a stockish setup, so you just gotta make a leap of faith (faith in numbers and physics and lots of testing pointing to certain solutions) and use it. if you'd like more help with it, PM me, and we'll talk, I'd love to help a fellow roadracer.
I personally use 43.5. not because some doc says so, but because I tuned my car perfect before i changed the injectors, used the 43.5 in the spreadsheet and the trims didnt' change, which is the expected behavior of when you're spraying the perfectly proportioned amount of fuel, just with a bigger 'headroom'
you dont have that advantage of starting from a stockish setup, so you just gotta make a leap of faith (faith in numbers and physics and lots of testing pointing to certain solutions) and use it. if you'd like more help with it, PM me, and we'll talk, I'd love to help a fellow roadracer.
