RoFLCoPTeR

I was wondering if anyone has some baseline Fuel tunes that they use that i could work off of while i tune my car for the first time. The car has 4 1000cc injectors, Stock turbo, stock intercooler, FCD and Boostcontroller with full 3 inch exhaust.

Thanks in advance.

arghx

iTrader: (3)

You're asking for trouble using an SAFC and 1000 cc injectors. By altering the airflow signal like that (reducing voltage to lean the car out) you will have unpredictable and potentially dangerous ignition timing. Plus there is no staging control. You really should at least get an Rtek 1.8 , which alters the internal tables for 720/720 injectors (there is no 1000/1000 option available). That will reduce the amount of SAFC correction needed and improve injector staging. Rtek 2.1 would be best, as it will give you full timing control and there is information out there for fuel and timing settings to try. I've actually come up with a bunch of Rtek timing maps that people have been using successfully so far. https://www.rx7club.com/rtek-forum-168/new-boost-based-timing-maps-885556/

1000/1000 injectors is WAY overkill for a stock FC turbo. Even FD's can do 300 to the wheels (stock turbos) on the stock FD side feed 550/850.

NoPistons!

iTrader: (3)

I'm with what the above poster said. Dude knows his **** and knows it well. He can even tell you how old and what brand the peanut is!



With that much fuel though you might want to think about going with a bigger single or changing the cold side on your stock turbo.

RoFLCoPTeR

Would it be more reasonable to run 550 primaries and 1000 secondary's?

arghx

iTrader: (3)

Are you planning on upgrading the turbo any time soon?

RoFLCoPTeR

I plan on a BNR stage 3 or 4 upgrade this winter. Also I wanna get a standalone. Basically the problem I ran into was I got my injectors checked and 1 of my injectors was pooched. My problem is I couldn't find another 550cc low impedence injector anywhere. So I order some new injector and only found low impedence 1000cc injectors. So I got stuck with them. Does anyone have low impedence 550cc injector?

RotaryRocket88

iTrader: (7)

You can buy used 550cc injectors in the classified section, then have them serviced & tested for about $19 each. Local shops can do it, or you can go through a company like Witchhunter Performance (http://www.witchhunter.com/).

SirCygnus

iTrader: (1)

you can tune the car without tuning it in the safc. 1000cc is a lot of injector though.

open up the AFM and turn the wheel inside of it.

its not recommended though.

http://www.youtube.com/watch?v=AydgS...os=pnr1OxVhENs

arghx

iTrader: (3)

Skip right to the standalone.

j9fd3s

iTrader: (3)

one of my friends was running 11's with a t4 550/1000's and an safc...

i know a couple other people with hybrid turbos who just run like 550/720's on the stock ecu, and its fine.

i should say that you can't just slap it together and expect it to run, you have to verify that its "safe".

and there is no such thing as a basemap for an SAFC...

RoFLCoPTeR

I know there is no "map" for it, I'm just asking for a good place to start withsettings

NoPistons!

iTrader: (3)

You know, a wideband and egt are very helpful tools when playing with fuel. THere is also an safc section on this very forum that's dedicated to such things. I wont put one on my car, i'm going to buy one for my buddies integra because it drinks gas like a ****, is na and is in dire need of leaning in the midrange under part throttle. Load vs rpm tuning..... THe ecu handles the topend fine according to his blinky a/f gauge but he needs a freakin wideband.

Skip to a standalone. We know what's possible with hacks and "good enough" setups but a power fc, megasquirt or something would fair better.

RoFLCoPTeR

Couldn't i just subtract the amount of fuel the 1000cc injectors are putting out with the SAFC since the stock ECU will be reading the AFR for 550cc injectors? then just go from there and slowly lower the load on the injectors until it sits at the right tune setting?

RotaryRocket88

iTrader: (7)

I think you're missing the point. In order to subtract enough fuel from four 1000cc injectors, you'll have to adjust fuel over the entire fuel map by as much as - 50%. When you make a huge change like that with an AFC, you also get huge changes to timing. It can be done, but it will be a LOT of tuning, and it will be risky with all the unknown timing changes. The ECU doesn't measure AFRs (aside from cruising, and then it's only a narrowband sensor), you have to do that yourself with a wideband, then make manual adjustments. The ECU only sees throttle position, air volume, air temperature, engine temperature & manifold pressure.

You would have a lot easier time keeping 550cc primaries, and using the 1000cc injectors only as secondaries. That will limit the amount of tuning you'll have to do to the upper pressure range, and prevent problems getting it to idle. Using smaller injectors would be even better still. The less dramatic your changes with the AFC, the more reasonable the timing will stay.

eriksseven

iTrader: (6)

Not only that, but try starting a car with 1000cc injectors squirting a gallon of fuel apiece... SAFC won't cut down on the fuel being injected on your startups--so you'd need to install a fuel-cut switch. Not a big deal--but just another example of the stock ECU's inability to handle the injectors.

RoFLCoPTeR

Already have a fuel cut switch so that is not an issue. All I am asking is it possible to run this setup and what I should do to make it run as good as I can get it.

sen2two

iTrader: (10)

swap the primarys to 550's. thats the only problem you have... Do that, and you will be just fine.

I have also tuned and tweaked the S4 AFM and had noticable results. Combine that with some tuning from the safc, and the car should run great. Given you have a good wideband to read your afr's...

j9fd3s

iTrader: (3)

with stuff like this, you ALWAYS start rich, and lean it out.

"as good as you can get" would involve a wideband and or egt, to make sure you're not too lean

RoFLCoPTeR

I do have a wideband, also I have a egt sensor it is just not installed. I have all the proper things to tune it I'm just looking for tips too tune it with the SAFC.

j9fd3s

iTrader: (3)

if its rich take away fuel...

the old school way, is to start almost too rich to run, and then lean it out until it doesnt hesitate anymore, and then call it good.... we didn't have widebands then but that would probably put fuel in the 10's... you don't want to be leaner than about 12:1

RoFLCoPTeR

Why would it not be good to go lower 12/1 afr? I thought 14.7 afr is perfect afr. I was thinking of going around 13.5 cause I think that would give me enough leeway for detonation and running to lean.

beefhole

iTrader: (29)

^NOOOOOOO
The turbocharged rotary is not normal. Then again 13.5 on a turbo piston motor is also a bad idea... Anyway, you cannot run that lean in boost. Most aim for 11.5 in boost. Maybe in low boost (under 5psi) you can run as much as 12.5, but any leaner than that and you are asking to blow up!

13.5-14.7 though is certainly acceptable in vacuum; normal driving and cruising.

NoPistons!

iTrader: (3)

Really, with those injectors (if you're wanting to run them) i'd consider selling the safc and buying rtek 2.1 or an msns if money is an issue.

Otherwise it's going to be more of an issue when you preignite or go through sparkplugs/gas like woah.

RoFLCoPTeR

Ok. Thanks for the heads up. So I should tune for around 12.5 then?

RoFLCoPTeR

Sorry.meant to say tune to 11.5 under boost and 12.5 on lower throttle inputs