Upgrade the 6CU to the 16CU
#1
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G'day Guys.
I am still rolling with the 6CU ECU in my ole girl and was thinking of trying to upgrade to the 16CU.
If I can't get my hands on one yet I am going to do what other forum members have recommended at the bare minimum and take out the 6CU and give those solder joints a work over in my little workshop.
For those that hadn't been following it, I have been having some issues when in low idle and getting warm (i.e like at traffic lights) and I have been eliminating a few things here and there on this thread:
https://www.jaguarforums.com/forum/x...eriods-168508/
My question for this particular thread is more in relation to upgrading the ECU.
1) Is it simply just plug and play? (ie. straight compatible)
2) What are the main differences between the two?
3) What adjustments are there to be made when installing the 16CU?
4) What are some things to look out for in buying a 2nd had one? (I am assuming you can't get these new no more).
Cheers again
I am still rolling with the 6CU ECU in my ole girl and was thinking of trying to upgrade to the 16CU.
If I can't get my hands on one yet I am going to do what other forum members have recommended at the bare minimum and take out the 6CU and give those solder joints a work over in my little workshop.
For those that hadn't been following it, I have been having some issues when in low idle and getting warm (i.e like at traffic lights) and I have been eliminating a few things here and there on this thread:
https://www.jaguarforums.com/forum/x...eriods-168508/
My question for this particular thread is more in relation to upgrading the ECU.
1) Is it simply just plug and play? (ie. straight compatible)
2) What are the main differences between the two?
3) What adjustments are there to be made when installing the 16CU?
4) What are some things to look out for in buying a 2nd had one? (I am assuming you can't get these new no more).
Cheers again
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orangeblossom (11-08-2016)
#2
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1) Is it simply just plug and play? (ie. straight compatible)
2) What are the main differences between the two?
3) What adjustments are there to be made when installing the 16CU?
4) What are some things to look out for in buying a 2nd had one? (I am assuming you can't get these new no more).
2) What are the main differences between the two?
3) What adjustments are there to be made when installing the 16CU?
4) What are some things to look out for in buying a 2nd had one? (I am assuming you can't get these new no more).
1) Yes
2) I dunno. "Improved circuitry"? Someone here will know, or you can probably find the answer on Bywater's AJ6 Engineering website
3) None that I know of.
4) Hopefully the seller knows if it was working properly or not and report honestly. Any obvious physical damage or water damage would be a red flag, obviously
Cheers
DD
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#3
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1) Is it simply just plug and play? (ie. straight compatible)
2) What are the main differences between the two?
3) What adjustments are there to be made when installing the 16CU?
4) What are some things to look out for in buying a 2nd had one? (I am assuming you can't get these new no more).
2) What are the main differences between the two?
3) What adjustments are there to be made when installing the 16CU?
4) What are some things to look out for in buying a 2nd had one? (I am assuming you can't get these new no more).
1) as Doug said, Yes
2) Much more reliable componentry and circuits
3) none at all
4) check it actually works in your car.
In the UK there are loads for sale (like your car they are Lucas, non-cat, 12:1 compression) and even guaranteed rebuilds. The 16CU upgrade is one of the most important upgrades you can make to your car.
Greg
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#4
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The 16CU upgrade is one of the most important upgrades you can make to your car
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So then.....anybody know what a good price is and what a rip off would be here in Oz money?
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orangeblossom (11-08-2016)
#5
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#6
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#7
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paulyling (11-07-2016)
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#8
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#9
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Greg
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#10
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#11
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#12
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Good question Daim, I too was wondering that.
Cheers Grant. My old girl is stamped with an AUG 85 build date. So I could get any one of these and I would be ok? What are the differences between these numbers anybody know?
I see on ebay they have some on offer but they mostly the appear to be for Marelli Engines. One picture has "32CU" on it so definitely not what I am after.
Cheers again.
DAC 4119, DAC 4478, DAC 4586 and DAC 6336
These are the 12.5:1 ECU numbers without Cats.
These are the 12.5:1 ECU numbers without Cats.
I see on ebay they have some on offer but they mostly the appear to be for Marelli Engines. One picture has "32CU" on it so definitely not what I am after.
Cheers again.
Last edited by paulyling; 11-07-2016 at 06:42 AM.
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orangeblossom (11-08-2016)
#13
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Paulying
The 36CU used on later V12s will NOT work in our cars.
Of the numbers Grant listed, I believe the last one, DAC6336 might be for Marelli ignition cars without cats (if they exist, which I think they do). I am pretty sure the ones starting with 4 are all OK.
If something suitable turns up in the UK I'll drop you a PM, as I suppose if you are marooned on the rig the postage time will not matter too much?
Finally, Roger Bywater at AJ6 knows all there is to know about these things, and if needed, he can modify any 16CU (Marelli, cat, non-cat etc etc) to work properly with the Lucas ignition. If offered one and you are not sure, I expect he would tell you if it would work or not.
I think in the UK you will have to pay around 100+ UKP for one, say 200/250 AUD.
Greg
The 36CU used on later V12s will NOT work in our cars.
Of the numbers Grant listed, I believe the last one, DAC6336 might be for Marelli ignition cars without cats (if they exist, which I think they do). I am pretty sure the ones starting with 4 are all OK.
If something suitable turns up in the UK I'll drop you a PM, as I suppose if you are marooned on the rig the postage time will not matter too much?
Finally, Roger Bywater at AJ6 knows all there is to know about these things, and if needed, he can modify any 16CU (Marelli, cat, non-cat etc etc) to work properly with the Lucas ignition. If offered one and you are not sure, I expect he would tell you if it would work or not.
I think in the UK you will have to pay around 100+ UKP for one, say 200/250 AUD.
Greg
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#14
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Paulying
The 36CU used on later V12s will NOT work in our cars.
Of the numbers Grant listed, I believe the last one, DAC6336 might be for Marelli ignition cars without cats (if they exist, which I think they do). I am pretty sure the ones starting with 4 are all OK.
If something suitable turns up in the UK I'll drop you a PM, as I suppose if you are marooned on the rig the postage time will not matter too much?
Finally, Roger Bywater at AJ6 knows all there is to know about these things, and if needed, he can modify any 16CU (Marelli, cat, non-cat etc etc) to work properly with the Lucas ignition. If offered one and you are not sure, I expect he would tell you if it would work or not.
I think in the UK you will have to pay around 100+ UKP for one, say 200/250 AUD.
Greg
The 36CU used on later V12s will NOT work in our cars.
Of the numbers Grant listed, I believe the last one, DAC6336 might be for Marelli ignition cars without cats (if they exist, which I think they do). I am pretty sure the ones starting with 4 are all OK.
If something suitable turns up in the UK I'll drop you a PM, as I suppose if you are marooned on the rig the postage time will not matter too much?
Finally, Roger Bywater at AJ6 knows all there is to know about these things, and if needed, he can modify any 16CU (Marelli, cat, non-cat etc etc) to work properly with the Lucas ignition. If offered one and you are not sure, I expect he would tell you if it would work or not.
I think in the UK you will have to pay around 100+ UKP for one, say 200/250 AUD.
Greg
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#15
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Thank you again guys.
Greg I would very much appreciate that PM if one pops up.
Grant has mentioned also that the DAC4586 is the Austraian spec Non Cat ECU, of 16CU type (Cheers again).
James (34by151) knows a fellow near his house that has them sometimes and I will try that avenue first to see how I go. That way I may be able to plug in and "try" before I buy incase she's a dud. From my other post:
Greg I would very much appreciate that PM if one pops up.
Grant has mentioned also that the DAC4586 is the Austraian spec Non Cat ECU, of 16CU type (Cheers again).
James (34by151) knows a fellow near his house that has them sometimes and I will try that avenue first to see how I go. That way I may be able to plug in and "try" before I buy incase she's a dud. From my other post:
Yes he has a bunch of 6CU's but no 16's at this point
He sends all the ECU's as a batch for repair/refurb
The 6CU's are taken apart and re soldered as 99% of time they have dry joints
16's are repaired as needed but seem to be a rare fail.
Not sure if this is correct but was told the 6's were hand soldered where the 16's were done in a wave tank. If thats correct it explains the dry joints
He sends all the ECU's as a batch for repair/refurb
The 6CU's are taken apart and re soldered as 99% of time they have dry joints
16's are repaired as needed but seem to be a rare fail.
Not sure if this is correct but was told the 6's were hand soldered where the 16's were done in a wave tank. If thats correct it explains the dry joints
Last edited by paulyling; 11-07-2016 at 10:44 AM.
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orangeblossom (11-08-2016)
#16
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Paulying
The 36CU used on later V12s will NOT work in our cars.
Of the numbers Grant listed, I believe the last one, DAC6336 might be for Marelli ignition cars without cats (if they exist, which I think they do). I am pretty sure the ones starting with 4 are all OK.
Greg
The 36CU used on later V12s will NOT work in our cars.
Of the numbers Grant listed, I believe the last one, DAC6336 might be for Marelli ignition cars without cats (if they exist, which I think they do). I am pretty sure the ones starting with 4 are all OK.
Greg
I have just modified my Megasquirt engine speed signal conditioning circuit to work with the Jaguar VR sensor as before it would not read the signal, ie no engine RPM.
Last edited by warrjon; 11-07-2016 at 02:38 PM.
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#17
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My understanding, based upon the fact that a friend is having a Marelli 16CU modified so it will work with a Lucas ignition car, is that it will not. However, the mod required is not particularly expensive or complex, though I have no idea at all what it consists of.
Roger Bywater at AJ6 would be the person who can give us a definitive answer.
Greg
Roger Bywater at AJ6 would be the person who can give us a definitive answer.
Greg
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#18
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The tach signal from a coil/ignition amp is very dirty and looks like a spike and requires a lot of signal conditioning so the ECU can trigger on the signal.
I haven't scoped the Marelli signal but I would expect the output to be a cleaner squarewave. This will allow the Lucas ECU to trigger. So the signal conditioning circuit is not required. I will have a look at my ECU to see what components were removed. I would not expect Jaguar to have made any changes to the PCB.
I haven't scoped the Marelli signal but I would expect the output to be a cleaner squarewave. This will allow the Lucas ECU to trigger. So the signal conditioning circuit is not required. I will have a look at my ECU to see what components were removed. I would not expect Jaguar to have made any changes to the PCB.
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#19
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Digital P: type 6Cu cat type:
DAC 2597
DAC 3586
Non cat type:
DAC 2596
DAC 3062
Type 16CU catalyst 11.5:1
DAC 4118,
DAC 4585,
DAC 6335,
DAC 6337
Not catalyst 12.5:1
DAC 4119,
DAC 4478,
DAC 4586
DAC 6336
Not catalyst 11.5:1
DAC 6338.
All will work with Marelli and with Lucas.
DAC 2597
DAC 3586
Non cat type:
DAC 2596
DAC 3062
Type 16CU catalyst 11.5:1
DAC 4118,
DAC 4585,
DAC 6335,
DAC 6337
Not catalyst 12.5:1
DAC 4119,
DAC 4478,
DAC 4586
DAC 6336
Not catalyst 11.5:1
DAC 6338.
All will work with Marelli and with Lucas.
Last edited by xjsv12; 11-08-2016 at 04:47 PM.
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#20
![Default](/forum/images/icons/icon1.gif)
Digital P: type 6Cu cat type:
DAC 2597
DAC 3586
Non cat type:
DAC 2596
DAC 3062
Type 16CU catalyst 11.5:1
DAC 4118,
DAC 4585,
DAC 6335,
DAC 6337
Not catalyst 12.5:1
DAC 4119,
DAC 4478,
DAC 4586
DAC 6336
Not catalyst 11.5:1
DAC 6338.
All will work with Marelli and with Lucas.
DAC 2597
DAC 3586
Non cat type:
DAC 2596
DAC 3062
Type 16CU catalyst 11.5:1
DAC 4118,
DAC 4585,
DAC 6335,
DAC 6337
Not catalyst 12.5:1
DAC 4119,
DAC 4478,
DAC 4586
DAC 6336
Not catalyst 11.5:1
DAC 6338.
All will work with Marelli and with Lucas.
Greg