I have recently put on a lift with 35s on my X. I have the idp street tune and I changed my revs per mile to 520 to accommodate for the larger tires. However it has been revving really high and not shifting at the right times. Is this just what I have to deal with because of the tires and stock gearing or do I need to change the tune or something. Any suggestions?

 

Is this a canned tuner? I would think you need a tune to make up for the Revs pm

 

No Its the custom street tune from innovative diesel performance.

 

Sounds like a tuner issue....plus...a 35" tire has 573 revolutions per mile.

 

If you run the stock tuning does the problem go away? Does the OD light blink at all?

 

Have not tried that yet, I will tomorrow.

 

So you think I need to change my revs per mile to 573 instead of 520 like the tuner company said?

 

Make sure you didn't accidentally change any of your shift points, or max RPM. I accidentally lowered one of mine once, and had almost the exact same symptoms.

 

Changed my revs per mile to 595 after calling sct to comfirm and I am back to normal. Thanks for the help guys.

 

Did SCT tell you to go to 595? When Eric did my truck he mentioned selecting the option as closest as possible, which for you would be 575.

 

Moving this over to the 6.0L PSD forum.

Stewart