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Thread: would this work or make sense?

  1. #1
    Join Date
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    would this work or make sense?

    I might be completely talking out of my a$$ here cause I'm new to this but someone tell me if this would work or if it's a bad idea. Could I set my stoich afr to say 15.4:1 to get better gas mileage but in the PE EQ ratio vs RPM set the ratio to 1.18 to bring the afr down to 13.0:1 for max power when i floor it? Or would it be bad on the motor to be changing the AFR so much so quickly? I know, newb question.

    Thanks.
    01 Z71 5.3 ECSB 4L60-E: Just bought it, so... bone stock... for now

  2. #2
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    It should be fine I believe that is the value lean cruise is set at on non american car.
    Step 1. crus at it.
    Step 2. get a hammer.
    Step 3. torch it.

  3. #3
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    Quote Originally Posted by Another WS6 Guy View Post
    Or would it be bad on the motor to be changing the AFR so much so quickly?
    You should see the AFR gauge when you push the go-fast button. It changes QUICKKKKK.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
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  4. #4
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    It's not worth it to go that lean. I seriously think if you do that you will pop #7 and believe me it'll be UGLY if it happens. Our engines do have a problem with #7 and going lean like that will only encourage it to go tits up.

    ~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~

  5. #5
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    lean on a cruise with minimal load, is completely different then racing with tons of load.


    That might be bit of an extreme, but I believe that is something similar to what Quik had on his tune.
    blown transmissions are about as useful as 97% of the guys on this forum

  6. #6
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    Quote Originally Posted by oleshifty View Post
    lean on a cruise with minimal load, is completely different then racing with tons of load.


    That might be bit of an extreme, but I believe that is something similar to what Quik had on his tune.
    I still wouldn't chance it with the #7 issues on these motors.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  7. #7
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    GM runs their trucks at 14.7 from idle to redline, even worse with a time delay on the HD's.
    NA driving would be fine, try it and post up the results.
    I had my avalanche running at 16:1 for a long time, about 30Kmiles, due to me not tuning it, hahaha, you know how it goes...

    I know you didn't say so, but definitely don't try it during boosted driving.

    Maybe keep an eye on egt's too, see how those change from one a/f to another.

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