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Guys,
Can I have some light shed on this area, I have done a ring around here in Sydney and got conflicting stories ... I figured that I would have to ensure that the trans ECU gets the correct speed signal as well as the speedo ... Is this true? What do I need to do to ensure the 3.7's / 3.9's work in harmony with the rest of the ED V8 automatic? Cheers,
_________________ Chasing 162mph on the Salt! 4.2L. Both race cars now sold! |
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| Disco Frank |
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i am pressuming u have or want to change your diff ratio.
if u ring Ford and tell them what you have done u should be able to get a spedo gear to chaneg which will give the correct speed readings to the dash ecu etc
_________________ RIP SCOTT |
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| MikGan |
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Yeah and dont take any of their crap, Ive heard storys of people chasing them for months to find out that they 'do' stock them! and for about $15 for an auto
_________________ I couldnt fix your brakes so I made your horn louder
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| 5150 |
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Ford stock them ?????
Even for ratios that were not offered by them? .... this is all that is need to keep all the ECU's working in harmony? Cheers
_________________ Chasing 162mph on the Salt! 4.2L. Both race cars now sold! |
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| Disco Frank |
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{USERNAME} wrote: Ford stock them ?????
Even for ratios that were not offered by them? .... this is all that is need to keep all the ECU's working in harmony? Cheers yup they should do! and yes all ya need  piss easy! just ask for a spedo gear ( driven gear )
_________________ RIP SCOTT |
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| 5150 |
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Well then? Anyone here know a helpful Ford dealer in their area who can assist? Or does anyone know what part numbers I should be asking for?
Cheers,
_________________ Chasing 162mph on the Salt! 4.2L. Both race cars now sold! |
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| MikGan |
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Just ring your local and tell em you need a speedo gear, if you dont know what ratio its 'was' just tell em your model and they'll work it it out, then tell em your new ration and they'll (hopefuly) get the right gear for ya
_________________ I couldnt fix your brakes so I made your horn louder
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| neb |
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i know the speedo gear effects the speed limiter but can anyone tell me if it effects the rev limiter? i wouldn't think that it would but i'm trying to work out why my ecu only lets me rev to 5200 while putting this same ecu in someone elses car it revs to 5500 before hitting limiter.
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| MikGan |
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on face value you I'd say no cause the revs are normally taken or your alternator, dont know about the newer cars but thats how its done on the old ones. When you change your gears in the diff you can expect different rpm readings than the same speed previous, thats just how it works. But the rev limiter..... well thats a tuff one! maybe someone with and ecu car can fill in that last link for ya
_________________ I couldnt fix your brakes so I made your horn louder
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| Disco Frank |
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no will not effect the rev limiter!
the difference in revs coudl be the gauges are out {USERNAME} wrote: on face value you I'd say no cause the revs are normally taken or your alternator, dont know about the newer cars but thats how its done on the old ones. When you change your gears in the diff you can expect different rpm readings than the same speed previous, thats just how it works. But the rev limiter..... well thats a tuff one! maybe someone with and ecu car can fill in that last link for ya
umm NO the revs are not takes on the alt they are taken off the coil
_________________ RIP SCOTT |
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| MikGan |
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oops my bad
_________________ I couldnt fix your brakes so I made your horn louder
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| 66 coupe |
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{USERNAME} wrote: Guys,
Can I have some light shed on this area, I have done a ring around here in Sydney and got conflicting stories ... I figured that I would have to ensure that the trans ECU gets the correct speed signal as well as the speedo ... Is this true? What do I need to do to ensure the 3.7's / 3.9's work in harmony with the rest of the ED V8 automatic? Cheers, You need to leave the original speedo drive in the trans, as the ECU is matched to the diff ratio the car came out with. If you change the speedo drive, then shift points and kickdown points, and also max allowable speed to manually downshift will all increase, in proportion to RPM You will need to install a digital speedo adjuster just before the VSS wire reaches the instrument cluster to adjust the speedo. You can calibrate the speed adjuster on a dyno. By keeping the original speedo drive, the ecu wont see any difference, therefore the shift points will remain the same in proportion to RPM, only that the vehicle will be travelling physically slower by 15-20% depending on your new diff ratio. |
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| xpression |
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http://www.fordmods.com/forums/documents.php?doc=30
thisi s a speedo calc but if u play around with it u can probably figure out what speedo gear u need |
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Maybe a small-block tractor puller! or a Lotus 7 Clubman is next! or a 351-stroker powered EB ... ?
