On downchanges I believe. I can confirm later after a consultation of my HP20 bible...Stempy wrote:At what point does it tell the engine ecu to back off the ignition timing?
4hp20 lock up question
Moderator: RichardW
Just a thought here with it being a mk1 box on mk2 ecu are there subtle differences with the internals that could cause it to throw a tantrum and then re-learn everything?xantia_v6 wrote:From my experience of that car, it will gradually get smoother again. The auto-adaptive logic is struggling to find a set of parameters that it is happy with.Chris570 wrote: Mine has changed in the past few hundred miles from being powered with cream to being a lot more solid in the way it changes gears if that makes sense, the TC will still slip in doddery git mode but not much. the gear changes are more noticeable now than they were. i'm watching this one with a close eye
The "firm" (if not "clunky") phase is rather like the behaviour for the first few miles after a Lexia reset of the transmission parameters.
also, driving in snow mode, is that bad for the box to do it frequently?
2006 C5 HDi 170
1998 Xantia Activa S1
1971 D Special
2006 C3 1.6 HDi SX,
1998 Xantia Activa S1
1971 D Special
2006 C3 1.6 HDi SX,
A 1/3 of Team WFA 'Clarkson'CitroJim wrote: I'm a pink fairy
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On this transmission, I don't think that there would be any bad consequences (other than performance and fuel consumption), the oil in the torque converter will be working a bit harder, but none of the mechanical components should be stressed.Chris570 wrote: Just a thought here with it being a mk1 box on mk2 ecu are there subtle differences with the internals that could cause it to throw a tantrum and then re-learn everything?
As far as I know, the same 4HP20 software is used on Xantia Mk1 and Mk2 and XM (there were a couple of updates, apparently including one to eliminate the 3000 RPM upchange when cold), but there should be no problem with backward compatibility.
Chris570 wrote: also, driving in snow mode, is that bad for the box to do it frequently?
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Chris570 wrote:Just a thought here with it being a mk1 box on mk2 ecu are there subtle differences with the internals that could cause it to throw a tantrum and then re-learn everything?
Well, My MK1 is effectively talking to a MK2 Valve Block from a MK2 2.2HDi and seems more or less happy.
As far as I'm aware, there is no fundamental difference between the MK1 and MK2 'box apart from the dipstick deletion and that did not occur with MK1 to MK2 transition. My R plate MK2 has a dipstick.
Basically, if you reinitialise using a Lexia, it just gets on with the job of re-learning without necessarily caring about the precise specification of the egarbox internals.
No, snow mode is just another map...Chris570 wrote: also, driving in snow mode, is that bad for the box to do it frequently?
Jim
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
Thats not good then. i don't get wheel spin unless tires are cold, really only takes off around 2500rpm. The adaptive feels like it adjusts to throttle position so in traffic it i can move 1100-1500rpm and it still feels fully locked up, but if i floor it seems like a calculated increase up to 2500rpm at a slightly slower rate than the torque converter would naturally spin up. Gear changes feel fairly firm. All seat of the pants stuff not measured it but sounds like I should watch it from what has been said
Love my black v6 xant - only one with cream coloured leather too!
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Yes, sadly Citro, it seems your 'box may be a little on the tired side. You have the two V6s so have you compared the two..
Yours definitely behaves nothing like all the ones I've experienced (five I think, at last count)
Point is, if you feel the 'box is a bit on the slippy side then NOW is a good time to rebuid it before any damage occurs.
My suspicion is it is low on oil pressure due to a pugging filter and a new filter, seals and TLC may be all it'll need to make it good again..
Leave it until it throws it's toys and it can be a different matter...
Yours definitely behaves nothing like all the ones I've experienced (five I think, at last count)
Point is, if you feel the 'box is a bit on the slippy side then NOW is a good time to rebuid it before any damage occurs.
My suspicion is it is low on oil pressure due to a pugging filter and a new filter, seals and TLC may be all it'll need to make it good again..
Leave it until it throws it's toys and it can be a different matter...
Jim
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
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Sound like someone's touting for work
It infuriates me to be wrong when I know I'm right
Lexia ponce
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Lexia ponce
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Both of them do this, I will observe it more over the next few days. Maybe I am just thinking about it too much. I only really started to notice this after i drove my sisters 1.4 c3 which is obviously geared a bit lower and is a bit more responsive at lower speeds
Thanks for the heads up
Thanks for the heads up
Love my black v6 xant - only one with cream coloured leather too!
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- Joined: 26 Feb 2004, 23:21
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Renault Kangoo 1.6 auto, tarted up and remapped
Still missing the Xantia V6
Not missing the AX - Contact:
When I had my old 2.0 VSX auto Xantia I found that the initial pick up on that seemed sharper than the V6 but only for about 10 yards......
It infuriates me to be wrong when I know I'm right
Lexia ponce
http://perception.dyndns.biz/~avengineering/index.htm
Lexia ponce
http://perception.dyndns.biz/~avengineering/index.htm