ChequeredRoof
New Member
- Joined
- Jan 22, 2010
- Messages
- 8
- Reaction score
- 0
- Points
- 0
- Location
- UK
- Vehicle Year
- 2005
- Make / Model
- Special vehicle
- Engine Size
- 4.0 V6 SOHC
- Transmission
- Automatic
I know, I know, much has been said about the stupidity of trying to remove the 93mph speed limiter, but my reason is slightly different...
I have an ex-RAF 1989 Ford Transit County 4x4 in the UK into which I have squeezed a US-spec 4.0 SOHC (and A5R55E transmission) from a 2004 Ranger.
Here's the engine:
That's a Mustang 4.6L radiator in the front.... but anyway, my problem is that with the axle ratios I am running, the PCM thinks the vehicle is doing 90mph when actually it is doing 60mph. This is very frustrating, as I used to be able to cruise at 75mph with my old 2.0L engine. Now I can only ever reach 60mph (although I do get there very quickly!!).
The PCM has already been professionally re-programmed to believe that it has the closest Ranger tire sizes and transmission ratios to match what I have, but it still reckons I'm doing 1.5 times (yes, 1.5 times) the speed I am actually doing. I have been told that it is not possible to "tweak" the PCM any more than this; I am apparently at the limit of the settings.
I have tried using two different box of tricks (one from Ford Performance) to alter the speed signal to try and "fool" the PCM into thinking the speed is lower, but all this does is throw the transmission (A5R55E) in a fit. I have been told this is because the difference between the output shaft speed and the road speed is too far outside the normal limits of what it expects.
Other than change the axle ratios, the only route left is to try and remove the speed limiter. My tyres are rated to 95mph, but actually I would be delighted just to get to 70 or even 75. I am pulling 3,049rpm at 60mph, and would be doing 4,065rpm at 80mph. That's plenty enough for me.
So, has anyone managed to re-programme the PCM to remove or re-set the speed limiter? With respect, I am keen to hear from anyone who has actually, definitely, genuinely managed to do it successfully. I know there have been plenty of suggestions in other posts of various reprogrammers I could try, but I don't want to spend good money on this unless I KNOW that it's going to be possible.
Thanks for reading this far, and I trust what I have written makes sense. By the way, I could never have done my engine swap without advice from the Ranger Station. A top resource.
I have an ex-RAF 1989 Ford Transit County 4x4 in the UK into which I have squeezed a US-spec 4.0 SOHC (and A5R55E transmission) from a 2004 Ranger.
Here's the engine:
That's a Mustang 4.6L radiator in the front.... but anyway, my problem is that with the axle ratios I am running, the PCM thinks the vehicle is doing 90mph when actually it is doing 60mph. This is very frustrating, as I used to be able to cruise at 75mph with my old 2.0L engine. Now I can only ever reach 60mph (although I do get there very quickly!!).
The PCM has already been professionally re-programmed to believe that it has the closest Ranger tire sizes and transmission ratios to match what I have, but it still reckons I'm doing 1.5 times (yes, 1.5 times) the speed I am actually doing. I have been told that it is not possible to "tweak" the PCM any more than this; I am apparently at the limit of the settings.
I have tried using two different box of tricks (one from Ford Performance) to alter the speed signal to try and "fool" the PCM into thinking the speed is lower, but all this does is throw the transmission (A5R55E) in a fit. I have been told this is because the difference between the output shaft speed and the road speed is too far outside the normal limits of what it expects.
Other than change the axle ratios, the only route left is to try and remove the speed limiter. My tyres are rated to 95mph, but actually I would be delighted just to get to 70 or even 75. I am pulling 3,049rpm at 60mph, and would be doing 4,065rpm at 80mph. That's plenty enough for me.
So, has anyone managed to re-programme the PCM to remove or re-set the speed limiter? With respect, I am keen to hear from anyone who has actually, definitely, genuinely managed to do it successfully. I know there have been plenty of suggestions in other posts of various reprogrammers I could try, but I don't want to spend good money on this unless I KNOW that it's going to be possible.
Thanks for reading this far, and I trust what I have written makes sense. By the way, I could never have done my engine swap without advice from the Ranger Station. A top resource.