CTT tuning on 18 deleted w/ 40's - Dodge Cummins Diesel Forum
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post #1 of 64 (permalink) Old 10-17-2019, 03:39 PM Thread Starter
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CTT tuning on 18 deleted w/ 40's

I have a 2018 that has been fully deleted. I have stock gears and 40" tires.
Before the delete I had the 40's on for 30,000 miles, it did not shift bad but was not great until I corrected the speedo with the AEV procal. After that everything was great! Drove great, shifted perfect and was getting about 16 mpgs in town 18 mpgs on highway and 13 mpgs towing. I was pleased but thought it would be great if I could get better mileage. I deleted it and tunned with ez lynk and CTT. It shifted horrible, could not get it to go to 6th until 80mph. After many many tunes I got one that is ok, shifts into 6th at 58mph at part throttle, but seems to "float" between gears for a while and is worse towing. I have asked the tech at CTT about this and he says he does not know what to do. He sent me another tune but it did not work.

My goal here is long life, good drivabilty and great mileage. I am open to ideas.

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post #2 of 64 (permalink) Old 10-17-2019, 03:56 PM
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Re-gear
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post #3 of 64 (permalink) Old 10-17-2019, 03:57 PM
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I have an idea.

Fix your gearing. That'll be the single most significant thing you can do to improve driveability, shifting, and make life easier on your transmission.
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post #4 of 64 (permalink) Old 10-17-2019, 04:05 PM
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that is some fabulous mileage with 40's and stock gearing.
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post #5 of 64 (permalink) Old 10-17-2019, 04:17 PM
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40 inch tire and stock gears. The one thing you can bet is it will not have a long life. Ask them for a tune with out the trans tuning and use that if thats what you liked. Or get a raceme and tune it without the trans tune.
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post #6 of 64 (permalink) Old 10-17-2019, 04:18 PM
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O wait. Is this crank yankers....lol
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post #7 of 64 (permalink) Old 10-17-2019, 04:33 PM
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You have 40’s, on stock gears, complaining about how bad it tows/shifts
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post #8 of 64 (permalink) Old 10-17-2019, 07:05 PM
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Right so we have gotten the negative out of the way. Re gear will definitely help with everything.

Do you have trans tuning? If not that will help as well. If you do then try having your shift point adjusted to your liking. CTT usually has very good reviews and trans tuning so hopefully they get it lined out. But your biggest improvement will be new gears.

Edit: Also a big welcome to you sir. Lots of good info here dont let a lot of ribbing turn you off.

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post #9 of 64 (permalink) Old 10-17-2019, 08:17 PM
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Software won’t fix it.
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post #10 of 64 (permalink) Old 10-17-2019, 08:19 PM
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This has to be a prank. Long life? Good drive ability? Great mileage?
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post #11 of 64 (permalink) Old 10-17-2019, 08:41 PM
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Iím no professional but those donít look like 40ís.
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post #12 of 64 (permalink) Old 10-17-2019, 08:53 PM
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Quote:
Originally Posted by nick00less View Post
Software wonít fix it.
No it wont. But changing the shift points will stop it from "floating" between gears. So would manually shifting. Holding a gear longer will improve drivability some. Gears are always the right answer when 3.42s are the alternative.
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