Minimaxx Tire Diameter - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 08-23-2010, 06:56 PM Thread Starter
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Minimaxx Tire Diameter

So I have had my minimaxx for a few months now and when I first tuned it, I left the tire diameter at default (stock 20's) and my speedo read about 3km/h slow. I am comparing this to a Garmin Nuvi by the way. So I decided to change it this weekend to 34" to match the stock tire height, but now my speedo reads 5 km/h fast. So my Garmin says 100 km/h and my speedo is 105 km/h, and my odometer is out now too.

Has anyone else seen this?
Just want to know if i'm on glue. What have you other H&S owners entered? Want to get it right dont really don't want to test a bunch then i'll have to do the relearn over and over.
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post #2 of 9 Old 08-23-2010, 09:55 PM
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Ran into the same issues with my truck, I ended up just trying a couple different sizes in the Black Maxx before I got it right when compared to my GPS. My truck has the stock 275/65r18 tires and 32.25" ended up being my magic number.

2002 LB7 Duramax
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post #3 of 9 Old 08-24-2010, 06:11 AM
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Originally Posted by jberzerker View Post
So I have had my minimaxx for a few months now and when I first tuned it, I left the tire diameter at default (stock 20's) and my speedo read about 3km/h slow. I am comparing this to a Garmin Nuvi by the way. So I decided to change it this weekend to 34" to match the stock tire height, but now my speedo reads 5 km/h fast. So my Garmin says 100 km/h and my speedo is 105 km/h, and my odometer is out now too.

Has anyone else seen this?
Just want to know if i'm on glue. What have you other H&S owners entered? Want to get it right dont really don't want to test a bunch then i'll have to do the relearn over and over.
Have you updated it to the latest version, they put an update out for the tire size calibration issue

2010 F-250 6.4 4dr 4x4 w/ 3.55 and H&S Black Maxx!
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post #4 of 9 Old 08-24-2010, 06:43 AM Thread Starter
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Yeah I updated it to the newest version saturday. I think I will try the 32.25 just to get the speedo reading correct. Thanks
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post #5 of 9 Old 08-24-2010, 02:49 PM
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Originally Posted by jberzerker View Post
Yeah I updated it to the newest version saturday. I think I will try the 32.25 just to get the speedo reading correct. Thanks
Same thing with my XRT. When programed to 35" tires, speedo was off 10 mph. Had to play around with settings until it jived with GPS

2010 F250 6.4 Black Pioneer Nav, Jl, Memphis audio Subs, Memphis Hybrid Amp.
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post #6 of 9 Old 08-24-2010, 02:54 PM
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Your actual tire size needs to be measured for the most accurate reading. A tire advertised as a 35" will often measure 33.5" tall. A good rule of thumb is to take a tape measure and measure from the ground to the top of the tire, or just take 1" off from the advertised size and start from there.

Hope this helps!

Thanks guys!

Bentley
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post #7 of 9 Old 08-24-2010, 03:46 PM
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Sorry to derail, but how important is the tranny relearn?

-Steve
2011 F-350 Lariat 4x4 SuperCew: White Platinum Tri-Coat, Goodyear Wrangler Silent Armors, Window Tint
2001 Hyundai Elantra: Daily Driver
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post #8 of 9 Old 08-24-2010, 03:51 PM
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Sorry to derail, but how important is the tranny relearn?
Trans Relearn is recommended, but not required. The 5R110 is constantly relearning every time you drive the truck. A relearn procedure is great for getting a good baseline on the learned transmission values. If you do not do a relearn your trans will simply take a little longer to hit every parameter it needs, but will get the job done on its own eventually.

You will notice that after hauling a trailer around for a few days, the shifts will be greatly different than before the trailer was attached. Also, over the day or so it will slowly adapt back to the unloaded shifting. Nothing to be worried about, just the trans trying to make sure it is doing the best job it can and last as long as possible.

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post #9 of 9 Old 08-24-2010, 06:56 PM
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Thanks Bentley.

Your product is truly amazing. One more question.

I noticed that the tip start feature no longer works. No big deal, just a surprise. I assume that is just something that hasn't been updated in the programing?

I'm not complaining! Just an observation .

Thanks for the words on the tranny relearn. I just don't really have a place where I feel safe to do that around these parts without driving a 50 miles out of town.

-Steve
2011 F-350 Lariat 4x4 SuperCew: White Platinum Tri-Coat, Goodyear Wrangler Silent Armors, Window Tint
2001 Hyundai Elantra: Daily Driver
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