SAFC Math....
#1
Honda-Tech Member
Thread Starter
SAFC Math....
I am running 440 dsm's with an SAFC. Stock integra injectors are 240cc so if I set my SAFC to -45% then my 440cc's will be at 240cc???? Is this how the math works? I don't have my turbo installed yet and I want to find the best tuning for right now.
#2
Honda-Tech Member
Join Date: Jul 2001
Location: New Jersey
Posts: 1,014
Likes: 0
Received 0 Likes
on
0 Posts
Re: SAFC Math.... (legendboy)
if your turbo, try using -40% so it runs more rich.
plus dsm's are 450, and to get them to 240, u'd need -46.6
[Modified by zojirushi, 3:15 PM 8/18/2002]
plus dsm's are 450, and to get them to 240, u'd need -46.6
[Modified by zojirushi, 3:15 PM 8/18/2002]
#3
Guest
Posts: n/a
Re: SAFC Math.... (zojirushi)
That would be correct except for this. Larger injectors take longer to open. I imagine that's because of the extra mass of the moving parts. Anyway, since they take longer to open, for short pulsewidths, they don't deliver as much fuel as you would expect based on injector size alone. That's why at idle you will probably need to add more fuel back to smooth it out.
#4
Re: SAFC Math.... (legendboy)
Just wanted to let you know that the DSM injectors you are using are low impedance which require a low impedance injector resistor box. Late model honda and acura's use high impedance injectors, so you will have to use a resistor box from an early model honda to keep from burning your ecu. As far as your question about injector size, we use a 440cc injector on our stage III turbo kits for GSR's. We make 350hp to the wheels @ 14psi with a stock ecu and an AFC. 440cc injectors are rated at approximately 325hp to wheels without an FMU at about 85% duty cycle. So, considering that you're running it with an fmu, you will have no problem. Hope that helps.
abid@sfp.net (Tech Dept)
[Modified by abid@sfp, 7:34 PM 8/19/2002]
abid@sfp.net (Tech Dept)
[Modified by abid@sfp, 7:34 PM 8/19/2002]
#5
Honda-Tech Member
Join Date: Apr 2000
Location: WI
Posts: 8,757
Likes: 0
Received 0 Likes
on
0 Posts
Re: SAFC Math.... (legendboy)
I am running 440 dsm's with an SAFC. Stock integra injectors are 240cc so if I set my SAFC to -45% then my 440cc's will be at 240cc???? Is this how the math works? I don't have my turbo installed yet and I want to find the best tuning for right now.
The percentage is the percentage of map sensor voltage.
#6
Honda-Tech Member
Thread Starter
Re: SAFC Math.... (sgT)
so what is the formula to find out the % of / from stock on bigger injectors when controlling fuel with the SAFC??
#7
Guest
Posts: n/a
Thread
Thread Starter
Forum
Replies
Last Post
HARRY-DA
Forced Induction
7
05-17-2010 03:25 PM