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Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

Can somebody with a relatively unmolested 931 post their VE table? (-Nick?...)
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1982 924 Turbo, now Lemon

Min · Posted: Tue Mar 11, 2008 3:23 pm Post subject:

Use the generated fuel map you get by typing in your motors specs/hp into the VE table generator. every car is different, variables like what kind of fuel pressure regulator and the diaphram response time will heavily change the curve. You do not want to use another person's map, it will be wrong for your motor and could damage things, start from scratch and tune your own table, It really won't take very long if you have a wideband oxygen sensor (which you should absolutely have on a turbo car)

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

macBdog · Posted: Tue Mar 11, 2008 5:15 pm Post subject:

You can't really use someone else's map. Different injectors and other bits of hardware make all the difference. If you don't have a reliable AF reading it will be extremely difficult. I got my car to idle and drive without one before I thought "screw this, I'm getting me a wideband!"
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1979 931 with a 350 chev
1973 911E with EFI

Rich H · Posted: Tue Mar 11, 2008 7:39 pm Post subject:

OK mine is an N/A but what they say is true, get a WB, check all of your senders are accurate and then, tune tune, tune!

If any of your senders are suspect then fix them now. It will screw everything up in the long run. My IAT sender was out of cal by 10 degrees and that screwed up my VE table as the MS though the air was less dense than it really was. I figured I would fix it later, when I did then I had to start tuning again from scratch

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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

I do have a wideband; it's just that every time I generate a map, it's grossly off

I was hoping that I can look at another person's map to make sure that proportionally, my map is alright. At the moment, I only have near-idle and N/A settings OK, but I'm about to start going into boost.
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1982 924 Turbo, now Lemon

Min · Posted: Wed Mar 12, 2008 1:35 am Post subject:

flosho · Posted: Fri Mar 14, 2008 1:32 pm Post subject:

Just curious what size injectors everyone is running and their req_fuel and injector method (simultaneous/alternating).
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[This Space For Rent]

Min · Posted: Sat Mar 15, 2008 1:41 am Post subject:

Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

WOHOOOO

Thank you all.

I just finished my first on-boost run (thirteen-to-one AFR ratio, on average). Builds up to 142 KPA, after that I stopped pushing the go pedal.

The fix to my idling was setting injectors to 2 squirts alternating. I'm using what's supposed to be 36lb/hr injectors, but they're way rich all over the map. Getting idle with 4 sqirts alternating was next to impossible, as it was either 12-1 AFR, or stall. 2 squirts actually allowed me to use the generated table after leaning it out a bit and then leaning out the idle section some more.
IIRC my req_fuel is 5, or something of that sort.

A bit more testing tomorrow, and then I'm off to the sunny Puerto Rico for a week. Just when I get things working...
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1982 924 Turbo, now Lemon

Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

150KPA! 6500 RPM!

Now, let me rephrase my original question....

Can I have somebody's SPARK table?

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1982 924 Turbo, now Lemon

Min · Posted: Tue Mar 18, 2008 2:42 am Post subject:

Hopefully someone with a 931 running megasquirt can give you their spark table. Nick?

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.