How Big?
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
How Big?
I had autoenginuity hooked up to the truck to enable and/or disable certain sensors and I noticed that I could re-calibrate the speedo for tires up to 40 and I was wondering how big can you go and get Ford to do it? I'm pretty sure it's less then 40, but I wanted to make sure. Thanks.
Postmaster
Joined: Aug 2006
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When I had my 35's on I used a laptop with IDS and a VCM and could not get it to accept anything less then 601 RPM's which is slightly smaller then your average 35" tire, so I just ended up leaving it at the factory setting...
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
That's what I thought that the dealership couldn't do up to 40. I wouldn't change out that stuff, I just thought it was neat that it would do that.
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
I was able to program mine for 36" tires, and it's now dead on accurate with my GPS.
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Post Fiend
Joined: Oct 2005
Posts: 10,626
Likes: 7
From: Plano TX and Brentwood TN
I didn't mean to imply that it was the limitation to the PCM, otherwise, like you said, I wouldn't be able to do any better then Ford.
