DIY Modification to Improve Performance and Fuel Economy of AJ16 and AJ6 Engines
#581
06-24-2020, 11:50 AM
Join Date: Feb 2014
Location: Crossroads of America
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Cheers,
Don
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#584
12-09-2020, 03:44 AM
Member
just bought a 96 jag xj6 vanden plas with aj6 yesterday, taking delivery friday. Id like to get one of your brackets. What do i need to do to make that reality ? Thanks!
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#586
12-09-2020, 05:37 AM
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#587
12-31-2020, 06:42 AM
#588
01-01-2021, 02:40 PM
Member
trueci havent, i was thinking of doing the programming mod u offer instead once the intake and exhaust gets fitted late spring. Thoughts on that idea?
#589
01-02-2021, 06:15 AM
I can reprogramme the ignition timing of your engine ECU. However, you can achieve a similar effect more cost effectively with one of my revised brackets. I only recommend a reprogrammed ECU for owners whole have increased the airflow of their engine by more than 10%, are doing a DIY auto to manual transmission conversion, or fitting the engine into a non X300 vehicle.
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#590
01-02-2021, 11:28 AM
Member
I can reprogramme the ignition timing of your engine ECU. However, you can achieve a similar effect more cost effectively with one of my revised brackets. I only recommend a reprogrammed ECU for owners whole have increased the airflow of their engine by more than 10%, are doing a DIY auto to manual transmission conversion, or fitting the engine into a non X300 vehicle.
I can reprogramme the ignition timing of your engine ECU. However, you can achieve a similar effect more cost effectively with one of my revised brackets. I only recommend a reprogrammed ECU for owners whole have increased the airflow of their engine by more than 10%, are doing a DIY auto to manual transmission conversion, or fitting the engine into a non X300 vehicle.
#591
01-03-2021, 06:49 AM
A revised crank sensor bracket will work with your proposed changes. I recommend that your new exhaust system includes bosses for the 2 downstream oxygen sensors, even if you don't fit catalysts. This will ensure that you can benefit from closed loop fueling control. If you don't have downpipe catalysts, the catalyst monitor strategy will trigger a fault and turn on the check engine light.
#592
01-03-2021, 03:32 PM
In terms of a Mina cold air intake, I have no experience of them. But I have tried a pod filter in my XJR, and I have reverted to standard filter box and paper filter, for the following reason: I played around with a thermometer on a long wire, taped to the standard snorkel. Even after idling in summer for 5-10 mins after a long hard run, with under bonnet temps around 60'C, when travelling again at say 50-60mph the temp at the snorkel intake would be ambient again after 1-2 miles. In other words, the standard air intake sucks in ambient air when moving at open road speeds.
Also, using an OBDII bluetooth device and iPhone software, I can max out my XJR airflow meter at about 4000-4500rpm at full throttle (I do have a 10% larger Powerhouse drive pulley). So I do not believe the standard set up is restrictive, and I don't think you can improve on intake temps - just my amateur opinion.
If your car is supercharged, a new Bosch electric intercooler water pump is well worth it.
Also, using an OBDII bluetooth device and iPhone software, I can max out my XJR airflow meter at about 4000-4500rpm at full throttle (I do have a 10% larger Powerhouse drive pulley). So I do not believe the standard set up is restrictive, and I don't think you can improve on intake temps - just my amateur opinion.
If your car is supercharged, a new Bosch electric intercooler water pump is well worth it.
#593
01-03-2021, 05:15 PM
Member
A revised crank sensor bracket will work with your proposed changes. I recommend that your new exhaust system includes bosses for the 2 downstream oxygen sensors, even if you don't fit catalysts. This will ensure that you can benefit from closed loop fueling control. If you don't have downpipe catalysts, the catalyst monitor strategy will trigger a fault and turn on the check engine light.
#596
01-29-2021, 03:29 PM
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Join Date: Jan 2021
Location: New York
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Hi Don,
Thanks for taking the trouble to provide such detailed feedback on your experience of fitting my bracket. I was disappointed to read that you weren't able to measure a more significant reduction in 0-60mph time given your comment about the subjective feel. However, it can be quite difficult to produce accurate back to back comparisons in vehicle performance. Many factors can create significant differences in tests that were intended to provide back to back comparisons. For instance, testing a vehicle with a full tank of fuel or a near empty tank would change the kerb weight of the vehicle by 3%. Conducting the tests on different days when the ambient temperature varied by 10degC would change the air temperature and hence engine power output by over 3%. The under-bonnet temperature will vary for a given ambient temperature depending on how the vehicle has been driven prior to each performance test. This can also affect the temperature of the air entering the engine.
I hope that you find the increase in performance after fitting my bracket is noticeable, even if you haven't been able to measure an improvement.
Thanks for taking the trouble to provide such detailed feedback on your experience of fitting my bracket. I was disappointed to read that you weren't able to measure a more significant reduction in 0-60mph time given your comment about the subjective feel. However, it can be quite difficult to produce accurate back to back comparisons in vehicle performance. Many factors can create significant differences in tests that were intended to provide back to back comparisons. For instance, testing a vehicle with a full tank of fuel or a near empty tank would change the kerb weight of the vehicle by 3%. Conducting the tests on different days when the ambient temperature varied by 10degC would change the air temperature and hence engine power output by over 3%. The under-bonnet temperature will vary for a given ambient temperature depending on how the vehicle has been driven prior to each performance test. This can also affect the temperature of the air entering the engine.
I hope that you find the increase in performance after fitting my bracket is noticeable, even if you haven't been able to measure an improvement.
I know this is an old post - but are your brackets still avvailable?
best
Ian
#597
01-29-2021, 03:33 PM
I feel like this thread will soon consist mostly of alternating posts of people asking if the bracket is still available, and me answering - yes, just send a mail to helenstodart@gmail.com to order one.
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#599
01-30-2021, 10:26 AM
Not only can I confirm that we are still making these brackets, but we have just past the milestone of the 900th bracket. Thank you very much to everyone over the years who have contributed to the success of what has become know in Jaguar circles as, the "Andy bracket".
As others have been kind enough to write, please just contact my wife Helen at helenstodart@gmail.com for more details.
As others have been kind enough to write, please just contact my wife Helen at helenstodart@gmail.com for more details.
Last edited by Don B; 01-30-2021 at 11:08 AM.
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#600
01-30-2021, 05:14 PM
Junior Member
Just picked up my XJR yesterday. One of your brackets was offered to me with the car for a further $100. Having never heard of the idea, or your product, before, I thought about it for a few seconds and said, "Yes please!" Yet to be fitted, but I'm encouraged to find this confirmation that my mental processes are still functioning fine!
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SleekJag12 (01-31-2021)