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-   -   Not for Nuthin' But Close! (https://classracer.com/classforum/showthread.php?t=77389)

Marty Knox 11-29-2020 07:48 PM
Re: Not for Nuthin' But Close!
 
Quote:
Originally Posted by Glenn Briglio (Post 628962)
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.

Doug Hoven 11-29-2020 10:03 PM
Re: Not for Nuthin' But Close!
 
2 Attachment(s)
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.

Glenn Briglio 11-30-2020 07:57 AM
Re: Not for Nuthin' But Close!
 
Ok cool.......what can you adjust in open loop? Can you monitor a/f ratio?

Doug Hoven 11-30-2020 08:36 AM
Re: Not for Nuthin' But Close!
 
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.

jmcarter 11-30-2020 09:35 AM
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.

Doug Hoven 11-30-2020 10:41 AM
Re: Not for Nuthin' But Close!
 
Quote:
Originally Posted by jmcarter (Post 628990)
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.

Glenn Briglio 11-30-2020 10:47 AM
Re: Not for Nuthin' But Close!
 
Quote:
Originally Posted by Doug Hoven (Post 628988)
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?

Doug Hoven 11-30-2020 10:56 AM
Re: Not for Nuthin' But Close!
 
Quote:
Originally Posted by Glenn Briglio (Post 628996)
.8-.9 is what in afr?
After some research, this is about 12.8-12.9 in terms of afr.

jmcarter 11-30-2020 11:00 AM
Re: Not for Nuthin' But Close!
 
Thanks Doug, I’m learning!

lvd2340 11-30-2020 12:01 PM
Re: Not for Nuthin' But Close!
 
Threads like this are always my favorite.


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