RX7withNitrous

I still don't get why i can't run a S-afc and some sort of data logger. with the right injectors and boost like 18-20 psi. someone tell me why.

dr0x

Whats controlling timing?

Matlock

You can run an S-AFC, however timing is still an issue, you could get a retard system of some sort though. I know MSD has some retard systems out there. I am in a similiar position as you, not wanting to buy a stand-alone. I only want to run 10psi on a T04 though not 18-20psi.

dr0x

10psi is a lot more air than 10psi on the stocker though. Something to think about.

Matlock

You don't have to tell me! I KNOW. I figure it will take me a few months to break in my new engine anyways so I am going to buy the Haltech after it's broken in and use an S-AFC in the mean time. I can't tune a haltech without having an engine that can't rev to redline anyways.

Matlock

RX7withNitrous is the T04 a hybrid or the whole thing. 18-20psi is pretty crazy power wise on a T04 well into the upper 300's. Might be easier to run low and buy a stand-alone later.

RX7withNitrous

im hoping to be mid 400's at 18-20psi. What happens if nothing is controlling your timing?? kaboom?

dr0x

You can run the base program and use a cheap wideband or whatever to do a bit of low end tuning and just guess and run rich up top until its broken in.

White_FC

An SAFC wont give you NEARLY as much adjustability as any standalone computer, which basicly means you'll either being running it too rich or too learn in some areas.. Besides, you'll still have the standard crappy computer running the whole shooting match, not to mention the AFM.....

Actually, just thinking about that...
if the AFM gets maxed out at say 10Psi (just hypotheticly..) @ say 5000rpm, how is it going to differentiate between 10Psi @ 5000 rpm or 20Psi at 5000rpm? or is it alot harder than that to max out one of these AFM? (anyone know their limits??)

eViLRotor

iTrader: (2)

The S-AFC does not have enough resolution to give you a proper fuel curve when dealing with those kind of boost levels.

Most standalones have at least 256 map points to ensure that you have smooth fuel delivery at various loads(boost) and rpms.

The s-AFC with, what, 8 points just doesn't give you enough fine tuning. A specific amount of fuel at 3500rpm while cruising, is not the same as fuel at 3500 rpm under boost.

Yes, timing is an issue as well. At high boost, you're running a lot less advance than the stock ECU would. Too much advance and Zoom Zoom Boom!

RX7withNitrous

how much is like a power fc and commander? is that a good ecu?

88IntegraLS

"what do you see when you look at the TII tail lights?"

I see shame and desire! That sounds like an awesome TII. I want one of those but am going to have to settle for a streetport and a bunch of other NA mods to my base 87. I will be running 14s forever!

RX7withNitrous

go with alot of fuel and some juice I used to be one of the n/a club hince the "Rx7WithNitrous"