Difference in tune using 93 octane w/o ethanol?
Thread Starter
Joined: Apr 2007
Posts: 9,711
Likes: 999
From: Evansville,IN
Difference in tune using 93 octane w/o ethanol? I had a quick question. Would there be a difference in getting my car tuned using 93 that doesn't have any ethanol in it?
The reason I ask is I'm going to stop using gasoline w/ ethanol in it in my small engines, lawn mowers, chain saws, etc. because it wrecks small engines.
My car is a 00. H/C/I/E with about 11.5:1 compression.
When I had my car dyno tuned my tuner pretty much set the A/F to 13:1@WOT. Someone commented in another thread of mine that ethanol blended fuel has a different A/F ratio than gasoline without.
Any opinions?
Jason
The reason I ask is I'm going to stop using gasoline w/ ethanol in it in my small engines, lawn mowers, chain saws, etc. because it wrecks small engines.
My car is a 00. H/C/I/E with about 11.5:1 compression.
When I had my car dyno tuned my tuner pretty much set the A/F to 13:1@WOT. Someone commented in another thread of mine that ethanol blended fuel has a different A/F ratio than gasoline without.
Any opinions?
Jason
Last edited by LilJayV10; Oct 5, 2011 at 08:57 AM.
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Joined: Jan 2009
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From: Bostwick, GA.
"When I had my car tuned my tuner pretty much set the A/F to 13:1. Someone commented in another thread of mine that ethanol blended fuel has a different A/F ratio than gasoline without."
13:1??? @idle, WOT, etc??
The ethanol problem is the pump signs say "up to 10% ethanol"...
I tried the 14.33 as stoich, and tried 14.63...Saw little difference, & left it at 14.63.
13:1??? @idle, WOT, etc??
The ethanol problem is the pump signs say "up to 10% ethanol"...
I tried the 14.33 as stoich, and tried 14.63...Saw little difference, & left it at 14.63.
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Probably going to have to run a little less timing advance and tweak the wot fuel a little, but other than that, should all be good. You are still going to target the same fuel number, most widebands read lambda and display in afr, so the target number of 13.0 will be the same if that is what is desired..
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Verdad Gallardo Thread Starter
Joined: Apr 2007
Posts: 9,711
Likes: 999
From: Evansville,IN
Probably going to have to run a little less timing advance and tweak the wot fuel a little, but other than that, should all be good. You are still going to target the same fuel number, most widebands read lambda and display in afr, so the target number of 13.0 will be the same if that is what is desired..
