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Old 11-29-2020, 07:48 PM   #81
Marty Knox
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Default Re: Not for Nuthin' But Close!

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What is the compression ratio of this engine? What fuel being used ? Fuel table would be cool.
The advertised compression ratio is 10.00:1.
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Old 11-29-2020, 10:03 PM   #82
Doug Hoven
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The combustion chamber design has some hemispherical properties, so more timing didn't seem to do any good. The fuel is 100 octane unleaded Sunoco 260GTX. The only fuel settings I can mess with are power enrichment (only active in closed loop), and injector pulsewidth multiplier vs manifold vacuum. For this reason I decided to run the car in open loop at all times and take control over the amount of fuel going in. With it in closed loop the ecu kept commanding the afr to be richer and richer and I couldn't get it under control. Attached are photos of both the injector pulswidth multiplier and the minimum spark table.
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Old 11-30-2020, 07:57 AM   #83
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Default Re: Not for Nuthin' But Close!

Ok cool.......what can you adjust in open loop? Can you monitor a/f ratio?
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Old 11-30-2020, 08:36 AM   #84
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Yes and No. There is an afr shown in the data log, but it shows that it is the commanded ratio by the ecu. However, when I started to mess with fuel, it did start to show leaner values. The 02 voltage is also shown, and is somewhere around .8 - .9 going down the track.
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Old 11-30-2020, 09:35 AM   #85
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Default Re: Not for Nuthin' But Close!

Just FYI that Mike Cashman has posted pics of the car in the FB Stock and Super Stock Racing group, assume the pic has Doug and Billy in it. Very cool little ride.
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Old 11-30-2020, 10:41 AM   #86
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Just FYI that Mike Cashman has posted pics of the car in the FB Stock and Super Stock Racing group, assume the pic has Doug and Billy in it. Very cool little ride.
That's not me next to Billy. That's the guy that was running the staging lanes.
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Old 11-30-2020, 10:47 AM   #87
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Default Re: Not for Nuthin' But Close!

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Yes and No. There is an afr shown in the data log, but it shows that it is the commanded ratio by the ecu. However, when I started to mess with fuel, it did start to show leaner values. The 02 voltage is also shown, and is somewhere around .8 - .9 going down the track.
.8-.9 is what in afr?
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Old 11-30-2020, 10:56 AM   #88
Doug Hoven
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.8-.9 is what in afr?
After some research, this is about 12.8-12.9 in terms of afr.
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Old 11-30-2020, 11:00 AM   #89
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Default Re: Not for Nuthin' But Close!

Thanks Doug, I’m learning!
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Old 11-30-2020, 12:01 PM   #90
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Default Re: Not for Nuthin' But Close!

Threads like this are always my favorite.
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