H239 - Anyone found a reversal?

C

Cooker

New member
Hi,

Appreciate that there have been many posts on this topic, but couldn't see if anyone had ever successfully found a way to reverse the updates - particularly the second one designed to keep the valves closed for longer? If Jaguar dealers won't do it, has anyone found an aftermarket solution?

Currently in the process of acquiring my first V8R and would prefer it not to have had the updates, but finding it hard to locate one with a JLR service history that hasn't had them, grr!

Thanks!
 
Velocity AP has tunes that restore the pops and bangs - lots of folk on the US forum enjoy it.
 
Thanks scm, looks interesting...

I was hoping, given the number of people frustrated by the updates, that there might be someone out there who could roll back the ecu updates rather than adding a different tune. I just want to achieve the theatre of the engine as it came out of the box!

The V8R I'm looking at is pretty close already, but appears to need to rev harder to achieve the same pops and bangs as others I've seen - so I'm presuming it's had H239 V2 applied - raising the revs needed for the vales to open... but this is just guess work, so I'm looking for a safety net just in case! It reverts to comfort on ignition, so I presume it's had H239 V1, but not sure whether it's possible to identify if V2 has been apllied?
 
Not the answer you were looking for but pulling Fuse 15 with the ignition off will keep the valves open all the time. I have installed a wireless fuse tap and switch today that allows me to control the fuse wirelessly from inside the car. I think it’s the only way around the issue apart from a remap.

Good luck with the search.
 
It's not the issue that it's made out to be. Pull fuse 15 and you get the full music all the time. Even without pulling it, it's really not an issue.
 
Cooker said:
The V8R I'm looking at is pretty close already, but appears to need to rev harder to achieve the same pops and bangs as others I've seen - so I'm presuming it's had H239 V2 applied - raising the revs needed for the vales to open...
Click to expand...

Mine's only had V1 applied and the result was that in dynamic mode the valves open from tickover. In non-dynamic mode the valves open around 3,500 rpm unless I switch the active exhaust on, when they'll open from 1,500 rpm. The pops and bangs are still present. It sets dynamic mode off on each start (it does remember the mode since if I switch ignition on within 6 hours the instruments are still illuminated red, then they change).
 
I just posted a thread about Paramount they seem to do a pop and bang tune for your exhaust if you check their website
 
A massive thank you to everyone who responded on this!

I feel a lot more comfortable now knowing that:

1. I'm probably getting a bit hung up on something that's nothing - the car still sounds great ;-)
2. If I want to I can pull fuse 15 to remedy.
3. There are tuners who can work some remedial magic for a reasonable fee.

Pretty much all bases covered...

Thanks again!
 
The one you posted about, WN67YAD, is car 54196.

It has v1 applied, so it forgets dynamic mode at each ignition cycle, but not V2 or V3.
 
Hi simpleR, thanks very much for coming back to me on this - much appreciated, and great to know the update status.
 
I recall a thread on PH about this a couple of years ago and made a note of one of the comments regarding the application of a patch to reverse the update. Not sure of its validity, but it was suggested you ask JLR to apply JTB495 to reinstate the pops and bangs????
 
JTB495 only applies to MY14 and MY15 cars. Unsure on MY16.

I don't know of anyway to reverse H239 on MY17 and later.

There is one known bug with some software updates in that it changes dynamic mode from factory setup to comfort mode. You can just go into dynamic mode settings and reselect factory setup. That seems quite common.
 
simpleR said:
There is one known bug with some software updates in that it changes dynamic mode from factory setup to comfort mode. You can just go into dynamic mode settings and reselect factory setup. That seems quite common.
Click to expand...

I'm sure they'd say it was a feature, not a bug! It did it to mine.
 
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