fritts

iTrader: (5)

For some reason I thought I read somewhere here on the forum the PFC has a restriction in how low of an opening it will allow you to supply to the injectors. Is this correct and if it is what is it? I am working on possibly using 160 lb injectors as primaries with E85 and would like to be able to idle at a decent A/F.

Howard Coleman

iTrader: (6)

just go to your datalogit and do a mapwatch set for Advanced Inj Fr Prim.
start your car, start logging. the number you see in your mapwatch will be the actual Ms.

reference your base fuel and note the Ms setting.

if you are rich, start lowering the base fuel setting. you will reach a point where your settings will not effect actual logged ontime. that's the minimum for the PFC.

this can be effected by changing lagtime but creates other problems for some.

if you are running peak and hold injectors in the primary as well as secondary i suggest you read my thread re the FJO & AEM convertor boxes. they will provide some help to you.

https://www.rx7club.com/single-turbo-rx-7s-23/goodby-resistors-hello-peak-hold-666741/

howard coleman

fritts

iTrader: (5)

I understand the nature of low impedence injectors and the modifications that have to be made. I did not want to buy and setup the 1600's for the primary if they wouldn't work. It would also tell me if I need to move to Haltech too. I guess I will play with my setting and see if it will allow me to move the MS's to whatever low value I want. My other worry is the injector my not be controllable at that point. I guess I can always try and sell them if it doesn't work.

I guess the thread you posted was different than the one I had originally assumed you posted. Good info in there. Suprised I hadn't seen it before.

Jason

iTrader: (5)

Why do you want to run 1600's in the primary location?

fritts

iTrader: (5)

E85 fuel needs and they are readily available for cheap compared to 100 lb injectors. If I can get away with it why not gives me more fuel to boot.

cewrx7r1

iTrader: (2)

Think of it this way. E85 requires about 33% more flow for equivalent power.
Thus 731.5CC E85 = 550CC gas. Thus using 850cc will allow 16% more power than with 550cc with E85.