SAFC ( knobs ) and 390's what setting?
Thread Starter
3.0 BAR
Joined: May 2003
Posts: 5,380
SAFC ( ***** ) and 390's what setting?
i know i have to scale them down but how much do you suppose i need? 20% 25%?
i read this but i am horrible at math!!!!
i read this but i am horrible at math!!!!
The scale for common injector sizes used is 5% for 440-450cc, 4%, 390cc, 3% for 310cc.. then subtract 1 percent per 500 RPM increase. This will give us are starting point.
Thread Starter
3.0 BAR
Joined: May 2003
Posts: 5,380
Re:SAFC ( ***** ) and 390's what setting?
wait i think i figure it out...
this would be for 450's which i do not have
\
but if i did the math correctly i come up with this...
1) 240/390 = 0.61
2) 0.61 - 1 = -0.39
3) -0.39 * 100 = -39
So we have a 39% difference, we add our 4% for injector latency compensation, which leaves us with these settings:
1000 - 34%
1500 - 34%
2000 - 33%
3000 - 32%
4000 - 31%
did i do this right?
this would be for 450's which i do not have
So, lets apply everything we've learned, and come up with base settings for 450cc injectors.
1) 240/450 = 0.53
2) 0.53 - 1 = -0.46
3) -0.46 * 100 = -46
So we have a 46% difference, we add our 5% for injector latency compensation, which leaves us with these settings:
1000 - 40%
1500 - 40%
2000 - 39%
3000 - 38%
4000 - 37%
1) 240/450 = 0.53
2) 0.53 - 1 = -0.46
3) -0.46 * 100 = -46
So we have a 46% difference, we add our 5% for injector latency compensation, which leaves us with these settings:
1000 - 40%
1500 - 40%
2000 - 39%
3000 - 38%
4000 - 37%
but if i did the math correctly i come up with this...
1) 240/390 = 0.61
2) 0.61 - 1 = -0.39
3) -0.39 * 100 = -39
So we have a 39% difference, we add our 4% for injector latency compensation, which leaves us with these settings:
1000 - 34%
1500 - 34%
2000 - 33%
3000 - 32%
4000 - 31%
did i do this right?
0.5 BAR
Joined: Feb 2004
Posts: 126
Re:SAFC ( ***** ) and 390's what setting?
My settings on 390c (B16A2, T3/T4B, 6-7psi, SMC500):
Idle: -30%
1000: 32%
2000: 31%
3000: 30%
4000: 29%
4500: 28%
5000: 27%
5500: 26%
6000: 25%
7000: 24%
8000: 24%
A bit rich, but no place around to tune.
Idle: -30%
1000: 32%
2000: 31%
3000: 30%
4000: 29%
4500: 28%
5000: 27%
5500: 26%
6000: 25%
7000: 24%
8000: 24%
A bit rich, but no place around to tune.
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