Bean

iTrader: (1)

Why would 550s not work with the stock computer?

I'm talking about getting a Super AFC and programming it to handle them... wouldn't it still run ok? the AFC can adjust up to 50% of the fuel delivery
that should be plenty to cover for the 550s vs the 330s...

SC300T

I think it has to do with the range of adjustment available within the stock ECU... Sure you can add and remove fuel with the S-AFC, but once you get so far out of whack, the S-AFC and the ECU stop getting along. At idle, the 02 sensors don't give the ECU very much feedback, and you end up losing accurate control over the mixture. I'm not sure what independent idle contol you have with the S-AFC, but I thought you could only adjust on low throttle and high throttle... The HKS AFR supposedly has an idle control mixture adjustment that may work.

This is a situation where the VPC will do a better job of controlling mixture. The VPC can be chipped for the injectors...

I still heard, though that even with the VPC, its not a smooth idle with 550s.

These things would have been done by Toyomoto if they worked, and Jeff would have them on his car if they worked well.

Bean

iTrader: (1)

hmm

i guess the VPC with the 440 chip will have to do along wtih the AIC

I guess I'd get the AIC first so i can run 10psi or so at least on the 8.5:1 compression (what is the max safe limit with 2 440 additionals?)

just trying to get stuff budgeted; might be able to include some of this stuff in my financing when i get the car

SC300T

Mine runs fine on the AIC (Haltec) with stock 330 injectors and only the two aux 550s pumping away. I've hit 15psi on race gas at 10:1 with open exhaust and was still rich, so I'm guessing that its at least keeping up with 500rwhp.

Bean

iTrader: (1)

two questions:

On your Haltech setup; does the Haltech have rpm AND boost based fuel delivery for the additionals?
or is just rpm based?

and

what kind of fuel pump are you running and how hard was it to install (Assuming its not stock)

SC300T

stock 93 Supra TT fuel pump... Drops right in. Doesn't fit bracket perfectly because its fatter, but you just put a metal hose clamp on it and you're good to go. Total time 1hr or less.

The Haltec AIC is not RPM dependent, it is boost dependent.

There are two continuously variable *****, one controls the threshold (the point at which manifold pressure or boost is high enough to start the injectors)

The second **** is gain, which controls the profile of the fuel gain. For instance with the gain low, and threshold at 0psi it would add x amount of fuel at 5psi.
with the gain medium it would add 2x at 5psi. High it would add 3x at 5psi. This controls the steepness of the profile.