Sean 83ZXT Posted January 11, 2005 Share Posted January 11, 2005 Do any of the folks using SDS have an excel spreadsheet for the fuel maps? I want to compare my values and I noticed something about a spreadsheet that will graph your maps from the yahoo SDSEFI group. Does anyone have something like this? Thanks, Quote Link to comment Share on other sites More sharing options...
rags Posted October 22, 2011 Share Posted October 22, 2011 Anyone? I'm new to SDS and working on a car that has not run in 10 years. Initial thoughts are duty cycle is way to high for stock L28ET injectors but I'm at a loss for figuring out the fuel map on this thing. A guess would be a 77 at 500RPM 77 at 1000 RPM and then up from there but even with those settings I think there is too much fuel to start. Any suggestions are greatly appreciated. Joe Quote Link to comment Share on other sites More sharing options...
Supra510 Posted October 22, 2011 Share Posted October 22, 2011 I don't have a map in that format, however when I was running SDS with 440cc's on a L28t I believe I used 62 as my constant value from idle to redline, maybe it was 65. Whichever it doesn't matter that much because you can use the MAP values to adjust the fueling. If you're at 77 I'd think that would be too rich, but it depends on your MAP values too. In the idle range you want the MAP values to be the same. I think for 18,19,20 in vacuum I was around 30-32 then for every inch of vacuum I went up 3-4 until I hit boost and then I went up 5 for every psi in boost. Do you have the fuel trim box? If so you could lean it out that way to get it started if what I told you doesn't work. I think stock L28t injectors are what, 370cc? So I'd probably use 60 or less as my constant, and then manipulate the MAP values to adjust the fueling. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted October 22, 2011 Share Posted October 22, 2011 Joe, does the car have a wideband? Quote Link to comment Share on other sites More sharing options...
rags Posted October 22, 2011 Share Posted October 22, 2011 Well she runs! Doesn't idle yet because I think the throttle body is closed completely. Shouldn't be too hard to get that squared away. Supra, I'm all the way down to 56 as a constant and still have the trim pulling another 17% to get a smooth idle with my foot holding the throttle open to keep 750rpm. Dave, no wideband hooked up. Doing all of this by feel at the moment. I would keep going but now I have to clean up the 5 quarts of oil on the ground from an oil filter that wasn't seated properly. The car has no exhaust so I guess I'll be at it again tomorrow. Still could use a speadsheet if anyone has one to check myself Joe Quote Link to comment Share on other sites More sharing options...
roger280zx Posted October 23, 2011 Share Posted October 23, 2011 Another variable that will help your fuel tuning is the enrichment knob. You can see its value on the third guage above the duty value. Quote Link to comment Share on other sites More sharing options...
Supra510 Posted October 23, 2011 Share Posted October 23, 2011 At this point I'd probably pull more values from your MAP setting in the idle range until it idles fine without pulling using the knob. Good it's up and running. Do you have a throttle screw you can use to open the throttle at idle? I never used a ZX throttle body, but I assume it's there. I wouldn't run much boost without a wideband, but you should be able to make it run and drive fine without one. Even if it's pretty pig rich it's drivable, if it's too lean it will stumble and hesitate. For the throttle pump I've only ever used 12-15 both high and low. Quote Link to comment Share on other sites More sharing options...
rags Posted October 23, 2011 Share Posted October 23, 2011 Anthony, I just checked out your Car domain page. All I can say is ho lee sh eet!!!!!!!!!! Quote Link to comment Share on other sites More sharing options...
Supra510 Posted October 23, 2011 Share Posted October 23, 2011 Lol, thanks. I've had the SDS in there (fuel only, long story) since 1997...Finally decided to run something newer so I just installed a Haltech e11v2 and got it up and running using LSx coils, but I'm taking it to someone else to tune. One thing I always liked about SDS was the simplicity, even if it lacked features, but I'm excited to see what this system can do. Quote Link to comment Share on other sites More sharing options...
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