Air/Fuel ratio ? - IMBOC
 
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post #1 of 10 (permalink) Old 01-04-2014, 10:29 AM Thread Starter

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Air/Fuel ratio ?

I just had an Edelbrock S/C installed and was tuned with the tuner that came with the kit. The air fuel ratio is between 12.3 and 13.5 and peaks at 15 at 6000 rpm. The tech that did the Dyno said that these numbers were too high (too Lean) and may cause some damage to the engine. He suggested I call Edelbrock. I did and they said those numbers are OK. I don't know who to believe. Any help would be appreciated.
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post #2 of 10 (permalink) Old 01-04-2014, 10:55 AM
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14.7 is ideal but under a load, usually 12's and 13's are what you want. 15 is a bit lean at WOT at 6k but I would not think it would do anything. At least that is my understanding. I am no tuner.

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post #3 of 10 (permalink) Old 01-04-2014, 11:12 AM
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post #4 of 10 (permalink) Old 01-04-2014, 01:32 PM
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Get it in writing maybe? I agree with Tim, 12/13 is all I see on my tune results.

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post #5 of 10 (permalink) Old 01-04-2014, 03:10 PM Thread Starter

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thanks Guys. I would like to hear if possible from some tuners or tech's also
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post #6 of 10 (permalink) Old 01-04-2014, 05:00 PM
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should be plenty of shops in the area you can call and see what they have to offer in the way of verifying what you have been told.

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post #7 of 10 (permalink) Old 01-04-2014, 08:23 PM
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Those numbers are insanely high for a boosted motor and WILL detonate. The absolute highest I've ever run was 12.0 which I later backed off to 11.7 I'd rather give up 20 hp than spit a head gasket or grenade a piston.

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post #8 of 10 (permalink) Old 01-04-2014, 10:44 PM
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You need more fuel, that is to much air. Find a local dyno shop to get those numbers lowed.

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post #9 of 10 (permalink) Old 01-05-2014, 02:23 PM
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Quote:
Originally Posted by kaylan1521 View Post
Those numbers are insanely high for a boosted motor and WILL detonate. The absolute highest I've ever run was 12.0 which I later backed off to 11.7 I'd rather give up 20 hp than spit a head gasket or grenade a piston.
Paul would know for sure. I was going by n/a numbers, boosted....have no experience with...

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post #10 of 10 (permalink) Old 02-11-2014, 02:22 AM

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With the Brenspeed 91 octane Vortech tune...at cruise Hwy or surface streets my A/F(Auto Meter) is at 14.6 to 15.3...In between shifts 13.8... Under Heavy load and WOT between 11 to 12. Drive-ability feels like stock. Video at 75 MPH cruisehttp://s65.photobucket.com/user/dnym...11928.mp4.html
Picture of gauge at idle

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Last edited by Bullitt#73; 02-11-2014 at 02:27 AM.
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