Quigley and Quadvan Owners - question - Ford Transit USA Forum
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post #1 of 8 (permalink) Old 01-09-2017, 10:33:AM Thread Starter
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Quigley and Quadvan Owners - question

Do you run a larger than stock tire and if so is your speedometer corrected for the larger tire?

2017 Ingot Silver, Cargo, Medium roof, 148"WB, standard length. 3.5L Ecoboost.
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post #2 of 8 (permalink) Old 01-09-2017, 12:16:PM
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No one on this forum has reported being able to change the speedometer yet.

Dealer says they can't do it anymore.

Most who have bigger tires just live with the incorrect speedometer.

2016 350 HD SRW Transit HR Van 148″, 3.5L EcoBoost® V6 Engine, 3.31 Limited Slip Axle, QuadVan 4×4, SYNC 3, Pewter power 10 way seats, Reverse, parking alert, Lane keeping alert, Dual batteries, Trailer tow package, PATS, Anti-Theft, Upfitter switches, Running Board, Privacy Glass

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post #3 of 8 (permalink) Old 01-09-2017, 12:25:PM
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Why is the speedometer error a problem? Once you know the percentage it is off then it is easy to correct the speed in your mind.

2015 high roof 148" WB 3.5 Ecoboost 3.31 LS rear cargo.
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post #4 of 8 (permalink) Old 01-09-2017, 05:44:PM
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smarty pants!

2016 250 MR Q4x4 cargo 148wb Ecoboost 3.31 limited slip
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post #5 of 8 (permalink) Old 01-10-2017, 12:53:AM
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After the correction factor is calculated, you could put a 3x5 paper card near dash with common speeds,

45 mph reads xx
55 mph reads yy
65 mph reads SS
70 mph reads as

Also, for around own

25 mph reads aa
35 mph reads bb
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post #6 of 8 (permalink) Old 01-10-2017, 05:09:AM
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from my truck driving days of driving with a broken speedometer cable, 13 forward gears equaled 10 mph per gear, (no speed limiter on the governor) i never got a ticket in 3 years of driving it! i guess that does not really apply to an auto transmission, but it was easy to calculate in your mind like the percentage your speedo is off in the transit.

2016 transit cargo 250 MR, LWB, 3.5 eco, 3.31 limited slip
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post #7 of 8 (permalink) Old 01-10-2017, 04:09:PM
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Or just use a GPS.
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post #8 of 8 (permalink) Old 01-11-2017, 09:47:AM
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I have changed the final drive ratio on many motorcycles and enjoy doing the math as I go down the road to figure how fast I am really going. It keeps my brain busy. However, I can see why you would want your van to read correctly.

With modern rigs they depend heavily on wheel speed for things like abs and traction control. Others have mentioned shift points in the transmission and possible damage with an incorrect speedo reading. I am not an engineer but this all makes sense to me. Will your abs and TC still work? Sure. Will it work as well as with a 27" tire? I doubt it. Same for the transmission. It needs accurate info to work.

At some point the aftermarket will provide a way to fix this I bet. VC claims a factory reflash was available, I am surprised that they would offer that up if it was not true.
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