SCT Revs for 33" tires - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 06-30-2009, 08:21 PM Thread Starter
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SCT Revs for 33" tires

Like it says, do any of you guys know what my revs need to be set at for running 33" tires. I recently got new tires and my speedo is jacked because the pragrammar is set for 35's. I tried calling innovative but there out of the office till next week. Thanks for the help guys!

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post #2 of 12 (permalink) Old 06-30-2009, 09:53 PM
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Several ways, look in the sticky section in this tuner forum. The stickys also show you how to save stock files to pc and has other useful info.

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post #3 of 12 (permalink) Old 06-30-2009, 11:23 PM
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post #4 of 12 (permalink) Old 07-01-2009, 12:07 AM
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Just keep in mind that SCT does not correct the speedometer, just adjusts for shifting purposes. Chris

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post #5 of 12 (permalink) Old 07-01-2009, 02:28 AM
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should be around 610 RPM

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post #6 of 12 (permalink) Old 07-01-2009, 02:31 AM Thread Starter
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Thanks for the help guys!!

Dominic
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post #7 of 12 (permalink) Old 07-01-2009, 02:53 AM
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the last set of 33's i had where around 640 revs, i haven't checked my new set yet.

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post #8 of 12 (permalink) Old 07-02-2009, 12:05 AM
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610 is what I use for 35s. I verified this with both the rolling tape measure test and my GPS/RPM test. 33s should be closer to 645.

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post #9 of 12 (permalink) Old 07-02-2009, 01:30 AM
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Quote:
Originally Posted by cartmanea View Post
610 is what I use for 35s. I verified this with both the rolling tape measure test and my GPS/RPM test. 33s should be closer to 645.
610 seems high for 35's!

I'm running my 35x12.50x20 at 595. Got my number by also doing the rolling tape measure. I do have 20'' rims however and M/T tread, not sure if that makes much of a differnce.

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post #10 of 12 (permalink) Old 07-02-2009, 01:36 AM
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Rim size doesn't make a difference, just different tire brands and mine are at about 50-60% treat. One revolution was 104 and 3/8", which works out to 607. I run 610 rather than 605 because as the tread wears it will get closer to 610.

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