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Old 30-05-2019, 05:25   #1
Thomas1993
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ACD and RS rear diff ?

Hi

I am currently building a rally car and I am using a RS rear diff and a 5 speed box. Can use a ACD with a RS rear diff ? Also as itís a rally car I would like to know if any one has ever been able to make the ACD disengage rear drive when pulling a hydraulic hand brake ?

Any advice would be great 👍🏻👍🏻
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Old 30-05-2019, 08:17   #2
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Hi

I am currently building a rally car and I am using a RS rear diff and a 5 speed box. Can use a ACD with a RS rear diff ? Also as itís a rally car I would like to know if any one has ever been able to make the ACD disengage rear drive when pulling a hydraulic hand brake ?

Any advice would be great 👍🏻👍🏻
All evo 7,8,9 rallycars use ACD with RS rear diff.. Central lock is automatically disengaged when you pull the handbrake (provided the little switch works.. )
Having said that, you always have drive to the rear, just the central diff lock is disengaged..
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Old 30-05-2019, 20:11   #3
Thomas1993
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All evo 7,8,9 rallycars use ACD with RS rear diff.. Central lock is automatically disengaged when you pull the handbrake (provided the little switch works.. )
Having said that, you always have drive to the rear, just the central diff lock is disengaged..
Great 👍🏻 I am guessing all the Rs rear diffs are the same as I am using a evo 6 diff and a 7 or 8 Acd. Meaning the rations between the 6 Rs diff and acd wonít be different ?

Also has anyone every just hard wired a ACD pump so itís constantly locked? Supplying full pressure to the ACD clutch ?
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Old 30-05-2019, 20:41   #4
kikiturbo
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if you just lock the acd you will have a ****ty handling car... you need the sensors and ACD controller.... stock is fine, can be reproggramed, or get an aftermarket unit such as motec..
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Old 31-05-2019, 10:28   #5
Thomas1993
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if you just lock the acd you will have a ****ty handling car... you need the sensors and ACD controller.... stock is fine, can be reproggramed, or get an aftermarket unit such as motec..
Great thanks. Would a well set up non ACD With a plated diff work as well ? Only as itís not on a evo itís just evo running gear? And using a acd would mean runing a steering angle sensor and abs sensors.
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Old 31-05-2019, 13:25   #6
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steering angle, longitudinal and side G sensors, wheel speed sensors...

speaking about non ACD..

first, you can have the normal open central diff with viscous lock... which is what non ACD evos do... On top of that there is choice between open, helical or plated front diff..

then you can have some sort of helical or plated central diff, which makes the viscous unit unnecessary.. but I have no experience with those..
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Old 31-05-2019, 14:31   #7
super rover
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IF you use a GEMS or MOTEC diff controller you dotn need the G sensors ,mine are all clipped up out the way

NO NEED to lock any diffs a working ACD is a superb tool ,going from a 6 rally car to a 7 i was amazed at the differance an ACD gave

if youve not enough funds to find a GEMS or MOTEC diff ecu i have a RALLIART RALLY DIFF ECU for sale ,we ran it on a 9 years ago since then its been sat in a draw
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Old 01-06-2019, 05:55   #8
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IF you use a GEMS or MOTEC diff controller you dotn need the G sensors ,mine are all clipped up out the way

NO NEED to lock any diffs a working ACD is a superb tool ,going from a 6 rally car to a 7 i was amazed at the differance an ACD gave

if youve not enough funds to find a GEMS or MOTEC diff ecu i have a RALLIART RALLY DIFF ECU for sale ,we ran it on a 9 years ago since then its been sat in a draw
Thanks I will have to have a look at a evo loom and see whatís involved in making the acd work. Do most people use the standard acd or do you fit different diffs ? It would be interesting to see the differents in handling with a acd and a non acd like a 5RS. As I am only using the evo running gear in a much smaller car 👍🏻
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Old 02-06-2019, 13:01   #9
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Thanks I will have to have a look at a evo loom and see whatís involved in making the acd work. Do most people use the standard acd or do you fit different diffs ? It would be interesting to see the differents in handling with a acd and a non acd like a 5RS. As I am only using the evo running gear in a much smaller car 👍🏻
YEAH most use a standard ACD ,it works brilliantly
i was suprised how much differance it made the first time i changed between tests ,the car was a differant thing ,im all for changing damper settings for wet dry and muddy ,a single press of a button gave me the same with out a thought
as for a wiring loom just fit a 789 one and away you go if you running a 456 loom its not easy to do
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Old 03-06-2019, 17:42   #10
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YEAH most use a standard ACD ,it works brilliantly
i was suprised how much differance it made the first time i changed between tests ,the car was a differant thing ,im all for changing damper settings for wet dry and muddy ,a single press of a button gave me the same with out a thought
as for a wiring loom just fit a 789 one and away you go if you running a 456 loom its not easy to do

Ok thanks the only trouble I have is I am just using evo runing gear in a fiesta shell. I woulnder if anyone has fitted a acd to a evo 5 or 6 as it would be interesting to know how they wired it in ? As this may help 👍🏻 I am thinking my other option is to use a 6 Rs non acd transfer box. But I am worried about how it will handle and using a hydro handbrake ?
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Old 04-06-2019, 16:37   #11
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Thomas,

Evo 5/6 GSR models and RS2 models had AYC: so they had pump and rear active diff.
The ECU pins are not same as later E7/8/9 with ACD, but you can "repin" the harness to work for you, and the plug/ECU is physically the same, so later E7/8/9 ACD (or ACD+AYC) Ecu can be plugged into E5/6 GSR AYC harness.. provided you moved pins to suit.
Than you use an ACD pump, ACD ECU Map, and run a custom hydraulic line to ACD.

Its been done ..
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Old 04-06-2019, 18:11   #12
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Ok thanks the only trouble I have is I am just using evo runing gear in a fiesta shell. I woulnder if anyone has fitted a acd to a evo 5 or 6 as it would be interesting to know how they wired it in ? As this may help 👍🏻 I am thinking my other option is to use a 6 Rs non acd transfer box. But I am worried about how it will handle and using a hydro handbrake ?
i rallied my 6 for 7 years using the bar on may occasion ,with no issues as long as you dip the clutch as you would normally in RWD youll be fine
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Old 04-06-2019, 18:12   #13
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ON THE BAR ,in the dry no bother
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