LT1-LT4 Modifications 1993-97 Gen II Small Block V8

gas mileage

Old Sep 5, 2011 | 03:47 PM
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what can i do for tuneup that will get me back to ok mileage? I'm getting 14mpg on a 3000 torque converter mail order tune and 3.23 gears. what could cause this? stock a4s get like 17/25. I have a hard time believing it got that bad from the converter
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Old Sep 5, 2011 | 04:46 PM
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Maybe its time for plugs, wires, filters and all the usual tune up things. My old A4 formula never got above 15. But I drove her a little hard.

Oh and seafoam that bitch. Worked wonders for my gas mileage.

Last edited by Mississippi; Sep 5, 2011 at 04:48 PM. Reason: left some shit out
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Old Sep 6, 2011 | 06:44 AM
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As said do a good tune up on everything and go from there. Bigger converters will eat some of your mileage but you should be able to get a little more out of it. I love my 6 speed and 4.10s i still manage to crack 26/27mpg on the hwy with my new current built motor in below in sig.
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Old Sep 6, 2011 | 08:42 AM
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What kind of day to day driving are you doing? Lot of stop and go with that converter will cause that kind of millage. Stock converters are around 1650rpm stall speed (+or-). As far as tune up make sure your Front O2's have been replaced at some point as well.
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Old Sep 6, 2011 | 09:49 AM
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i guarantee the converter put that mileage down there espically with the low gear.........
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Old Sep 7, 2011 | 10:32 PM
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Originally Posted by quik95lt1
i guarantee the converter put that mileage down there espically with the low gear.........
Are you saying you think my mileage could go up with 3.73 gears?
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Old Sep 7, 2011 | 10:36 PM
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With 3.73s and a 3600 stall when I was still living in NC, I was seeing low to mid 20s... and that was driving it pretty hard.. but that was on 93 gas and new brakes/tires/less than 60k on the motor.. etc... but mostly steady driving..

Now in CA, running 91 gas, and less than good tires/brakes/etc and 170k, I'm getting between 14-17, but lots of stop and go traffic out here..
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Old Sep 7, 2011 | 10:40 PM
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Honestly that sounds about right. I had a intake and cutout with a 3200 stall, stock 2.73's and was getting about 13mpgs. Even right after a fresh tune up.
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Old Sep 8, 2011 | 07:56 AM
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Originally Posted by ByProxy
Are you saying you think my mileage could go up with 3.73 gears?
its very possible for city driving.......issue is the mechanical leverage in the drive train isn't there with a low gear so it puts more stress on the converter making it stall at a higher rpm when driving normally.......i drive a 5300 around with 4.56's and its not bad........if i had 3.23's it would be like driving a wet sponge lol
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Old Sep 8, 2011 | 10:20 AM
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what is average milage for the lt1 m6 combo? just wondering
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Old Sep 8, 2011 | 11:26 AM
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Originally Posted by NASCARneil
what is average milage for the lt1 m6 combo? just wondering
15 city 25 highway ....avg about 17 mpg
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Old Sep 8, 2011 | 01:39 PM
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that converter does not lock up till around 40-45 and in stop and go traffic will kill milage. i wish i had 14mpg.
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Old Sep 8, 2011 | 07:18 PM
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Originally Posted by ahritchie
15 city 25 highway ....avg about 17 mpg
thanks
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