When calibrating the speedometer, once in calibration mode and traveling the 2 mile run, is there a speed that needs to be maintained?
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When calibrating the speedometer, once in calibration mode and traveling the 2 mile run, is there a speed that needs to be maintained?
Bill3422
MK4 - 302/347 Stroker - AFR Heads - 400 Hp
To amplify on what Mike said, the speedometer is counting pulses from the speedo sensor in the transmission. You don't have to maintain any set speed, and you can speed up or slow down as you desire / the road dictates.
Cheers,
John
P.S. Bill, you're quite the lurker. Only 104 posts in 6 1/2 years? Wow!
MK IV Roadster #8631
Ford 302, Holley Terminator EFI, T5z, 3.55 Rear End, IRS, 17” Halibrand Replicas (9” front, 10.5” rear), Nitto 555 G2’s (275/40ZR17 front, 315/35ZR17 rear), Fast Freddie’s Power Steering, F5 Wilwood Brakes, FFMetal’s Firewall Forward, Forte’s Hydraulic Clutch & Throttle Linkage
https://www.ffcars.com/threads/phile.../#post-4776313
104? Wow, that many? Thank you for the information.
Bill3422
MK4 - 302/347 Stroker - AFR Heads - 400 Hp
Like others have said, you can go any speed you want.
The first time I calibrated my speedometer, I went "about" 2 miles. That was not good enough. I checked my speed with a GPS unit and it was off by about 10 mph at highway speeds. I recalibrated and went exactly 2 miles. Now I am pretty accurate. Hope that helps. Good luck.
FFR MK4 Complete Kit #8952
Build Thread
Bodywork Thread
3 Link Rear Suspension, Gordon Levy 347 SBF with T5
First start Feb 20, 2017, First Go Kart March 5, 2017, Registered & Title April 25, 2017
I haven't done mine yet, but I would like to understand how it can calibrate knowing the number of pulses.
Finally started my build the beginning July. 2015!
Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.
Depends on the speedo..
The Classic Instruments speedo calibration was done by maintaining a set speed. I used a hand held GPS to give me a speed read out, then adjusted the black box until the speedo read the same. We then tested it at several speeds, and checked the odometer against hwy mile markers, and it was dead on.
FFR6803RD, MK 3.1, 302 EFI, fr/rr disc brakes, WC-T5, c/w Hurst Competition Plus shifter, 3 link rear, Koni adjustable coil over shocks, dual roll bars, BBK 4-4 headers, 3.55 rear gears, BBK rear lower control arms c/w poly bushings. Ivy Green Metallic Arrived-02/08, On road 09/2010
Are people still using the VSS from the trans even with the GPS gauges? If so, what is the reasoning; more accurate?
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Delivered: 6/17/2017
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I assumed the question was about the Speedhut gauges, since they seem to be the most common. Autometers also calibrate in a similar manner. But you're right. Classic Instrument gauges do require you to drive a fixed speed. My Mk3 build had those. That was a while ago, but looking at their current instructions appears it's still the same.
The VSS can't be used with GPS gauges. No wires to hook one up plus no internal mechanism to use the signal. The gauge is one or the other. I have the GPS gauge in my #8674 Roadster. Based on what I can tell, it's dead on accurate.
Last edited by edwardb; 08-28-2017 at 07:39 PM.
Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.
That is true. In spite of all the issues people have had with the Speedhut, they still seem the most popular. I presume that's because, that's what comes in the Complete Kit.
You'd think FFR would offer the Classic Instruments, and perhaps the Smith gauges, as optional choices, but perhaps there's not enough profit in it for them.
OK, maybe I'm hijacking the thread (for which I apologize), but it is related... check out the photo. The connector for the speedometer at the transmission has two white wires. The wires from the gauge connector (classic) is one white, one black. Or in the RF bundle, one white, one gray. I have to believe that it does matter which way you connect it. But which way? Thank you for not getting annoyed at this slight diversion.
Mk IV Roadster - #8650 - delivered 7-17-2015 - first start 7-28-2018 - first go-kart 10-13-2018 - licensed and on the road 9-9-19: body/paint completed 3-17-2020.
Complete kit / 2015 Coyote / TKO600 / IRS / Wilwood brakes / Mid-Shift mod / Power Steering / Heater and Seat Heaters / RT turn signal / Breeze radiator shroud and mount
My roadster wasn't wired with the RF harness, but I was led to understand it makes no difference, as long as one of the leads from the VSS is grounded. My Classic speedo works fine.
Since I have the GPS speedo, what should I do with the harness and opening in the driver's side trans tunnel wall? I suspect I could eliminate the harness, but not sure if it's better to keep it and just wrap it up.
I'll just silicone a patch over the hole unless it is needed for something else.
Thanks,
Dave
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I'd just tape the end and leave the connector in tact. You never know..... Also, just cut a small piece of aluminum (if the kit didn't come with the plate) and place it over the hole with silicone and rivets. I'd put the rivets in from the transmission side because you have insulation/carpet that will not show the rivet plug. Later on you know why when you're under there doing work and catch your hand on the rivets if you put them in from the cockpit side.
My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
(Most viewed Roadster build thread on this forum!)
Delivered: 6/17/2017
First Start: 12/30/2017
Completed: 12/7/2019
Legal: 1/30/2020
Member of the Mile-Hi Cobra Club
Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
Agora 1:8 Scale Cobra Build: https://thefactoryfiveforum.com/show...l-Build-Thread
Your kit came with a patch for that location. Looks like an oval with one end cut so it had a straight area.
Mike
My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
(Most viewed Roadster build thread on this forum!)
Delivered: 6/17/2017
First Start: 12/30/2017
Completed: 12/7/2019
Legal: 1/30/2020
Member of the Mile-Hi Cobra Club
Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
Agora 1:8 Scale Cobra Build: https://thefactoryfiveforum.com/show...l-Build-Thread