Sven Posted July 19, 2004 Report Share Posted July 19, 2004 Somewhat puzzling... Looking at Paul's recoding page I see there are not only codes specified by engine (I gather from the screenshot), but also they are different from the EU repair manual. And yes, they display the US/Canada codes as well. So how come? What's with the difference, and where does Bentley get these codes from? (I thought AOA). <ul type="square"> [*] Bentley codes [*] EU codes Interestingly, it says: <ul type="square"> Other codings are not permissible [*] Once the coding operation has been completed the fault memory in the control unit is automatically erased. [*] If an invalid code number is entered the control unit retains the old coding. So how does that add up? On a sidenote is mentioned the A8 reaches top speed in 4th gear, and 5 is basically set as an 'overdrive' whereas the S8 reaches top speed in 5th gear. Any comments guys? Last but not least, I'd be really interested to see the Bentley S8 gearbox codes, so if someone could post a screenshot of those, I'd be very grateful! Link to comment Share on other sites More sharing options...
cruiser647 Posted July 19, 2004 Report Share Posted July 19, 2004 So what are the revs in the S8 when it is doing 70mph in 5th? As you might know, on an ABZ Q Sport (UK Spec), 70 in 5th is 2100 rpm. I suppose, on previous models, SPORT mode on the gearbox would lock-out top gear. 5th on most non-sport models cars is the cruising gear, and 4th for fast moving. In Sport'y' cars, the top gear is used for top speed. Link to comment Share on other sites More sharing options...
SneakyMcC Posted July 19, 2004 Report Share Posted July 19, 2004 "Why have cotton, when you can have silk?" You are kidding arent you? Cotton is sssso sexy Link to comment Share on other sites More sharing options...
Sven Posted July 19, 2004 Author Report Share Posted July 19, 2004 TBH I haven't payed attention to RPM @ 70mph (besides, that's an odd speed for us in kmh). What I do know is that the S8 just keeps pulling in 5th gear. There's definitely no lack of power there. How's that with the A8 (4.2), is V-max reached in 4th and does 5th feel like an overdrive, or does it pull just as hard in 5th and reach V-max there? The 'sport mode' (re-introdiced on the new A8) shifts down earlier, and holds a gear longer, but I fon't think 5th is locked out. However, even the new A8 in 'sport mode' wasn't as quick as the S8. Odd enough - although there are many different gearbox models - the gear ratio of the 4D A8/S8 appears to be similar, the main difference seems to be in the front and rear diff ratio. Anyway, I'd be very interested to see the Bentley screenshot for the S8 codes. As well as any suggestions & opinions on this topic. (Paul?) As a matter of fact, I think the TCM 'chips' they offer here and there are not much else. What's also interesting in that respect is that many of these are offered for the A8, but not S8. Only Motodyne lists an S8 TCM chip AFAIK. Link to comment Share on other sites More sharing options...
cruiser647 Posted July 19, 2004 Report Share Posted July 19, 2004 Cotton can be sexy - just depends who it is covering! Link to comment Share on other sites More sharing options...
SneakyMcC Posted July 19, 2004 Report Share Posted July 19, 2004 [ QUOTE ] Cotton can be sexy - just depends who it is covering! [/ QUOTE ] Sorry, back to topic Link to comment Share on other sites More sharing options...
Botang Posted July 19, 2004 Report Share Posted July 19, 2004 Mine reached Vmax in 4th, but I only have 4 gears Link to comment Share on other sites More sharing options...
Botang Posted July 19, 2004 Report Share Posted July 19, 2004 Interestingly enough my gearbox code was 00000 when I got the car and I now use 00011 Link to comment Share on other sites More sharing options...
Sven Posted July 23, 2004 Author Report Share Posted July 23, 2004 Paul, where's you at dude? Link to comment Share on other sites More sharing options...
SneakyMcC Posted July 23, 2004 Report Share Posted July 23, 2004 [ QUOTE ] Paul, where's you at dude? [/ QUOTE ] I was thinking that yest? Have you pm'd him Sven? Link to comment Share on other sites More sharing options...
Sven Posted August 2, 2004 Author Report Share Posted August 2, 2004 Paul....? Or anyone else who can make a screenshot of the Bentley S8 gearbox codes? Link to comment Share on other sites More sharing options...
PaulW Posted August 2, 2004 Report Share Posted August 2, 2004 Sven- Been busy....looked in the Bently, but only saw the stuff for the U.S. bound A8....but here's something that Randy Young has done: He did this looking at a S8 (with a higher redline than the A8 that's why the speed is slightly higher in gear) and A8 with different final drives/combinations. The US A8 has a final drive of 2.909 for fuel economy, it revs very low. I believe all A8/S8's in Europe came with the 3.730 final drive.....which is what the S8 came to the states with. Then we were talking about the six speed manual that came in Europe and what speeds it would have.....Randy made this chart.... Does this help? I could look again in the Bently if it doesn't....but I will have to find where exactly it has this info.... pw Link to comment Share on other sites More sharing options...
Sven Posted August 2, 2004 Author Report Share Posted August 2, 2004 Cheers Paul, According to the manual the EU S8 has 4,111 and (4D) A8 4.2 3,700. That should go for the tip as well, I checked the S8 with my own final drive, not 100% certain there were no other options for the 4.2, but IIRC not (for EU). I suppose the reason why the recoding options - which is what I'm interested in - are partly different because the EU manual doesn't list the 'DSP off' codes (see screenshot above, in my 1st post). Maybe not a desired code from a factory point of view? I did a bit of a search on AW, and it appears there were some people with 'issues' using the 11 code? Anyways, I'm interested to see if Bentley has any 'DSP off' codes for the S8. My oil change hasn't been done yet BTW, as they discovered there was a seal missing from the ordered parts... (glad they waited, and didn't put the old one back in) So they just did the main service. Hopefully soon... Link to comment Share on other sites More sharing options...
Mort Posted August 10, 2004 Report Share Posted August 10, 2004 Hi Guys, I find the gearbox to be irritatingly slow at times so I was pleased to see that something can be done about it by re-coding it... I read the comments above and the pages on the audipages.com site but I need to be clear on what code to use.... <ul type="square"> I have a 1997 4.2 Quattro sport with tiptronic transmission. It is a UK (therefore European specification I assume). I would like to "improve" the response of the gearbox - should I therefore have the code set to 00011 or 00012 ? Also, does changing this code disable the Dynamic shift program or simply bias the program towards 'sport mode' ? Final question, would this cause a significant increase in fuel consumption (assuming driving behavious remains the same) ? Any feedback appreciated. Link to comment Share on other sites More sharing options...
Sven Posted August 10, 2004 Author Report Share Posted August 10, 2004 Hi Mort, IMO 00011 should be the correct code to try. I would expect some increase in fuel consumption, but probably PaulW or Botang could advise you better, as they have done this recode IIRC. Surely one of them will be along soon. Link to comment Share on other sites More sharing options...
Botang Posted August 10, 2004 Report Share Posted August 10, 2004 Fuel Consumption isnt an issue as far as I have noticed, so I wouldnt worry about that. Basically these codes are just different programmes so try and see which is the best for you, If you are using Vag-com to enter the code just put in the one you want, if it doesnt like it it wont accept it. From memory 000011 is the best code for you, is your car 5 speed? You will notice an instan change in the driving characteristics though Link to comment Share on other sites More sharing options...
Mort Posted August 11, 2004 Report Share Posted August 11, 2004 Yes - its a 5 speed. Thanks for the info guys - I'll let you know how it goes. Link to comment Share on other sites More sharing options...
Mort Posted August 17, 2004 Report Share Posted August 17, 2004 Well I made the change and it certainly makes a difference - but the jury is still out on whether I prefer this mode over the standard setting. One example : A nearby hill with a tight-ish bend at the bottom and several tight bends at the top. With the standard mode, I would get the normal 2 second delay in shifting down through the bend at the bottom, then it would hold that gear (3rd I think) all the way up the hill and through the bends at the top (which I have to back off for) - Apart from the hesitancy in changing down it is how it should be. Now, with the new gearbox setting (00011) it changes down quickly to second at the bend at the bottom (which is too low), the car accelerates harder, picking up more speed, as I then back off a bit, it shifts up a gear , then another, when I slow for the bends at the top its in too high a gear and has to shift down (which it does from 4th to 2nd - which is too low) then it shifts up too soon again.... You have to drive quite agressively for this mode to make sense. It doesn't appear to hold a gear on a hill like the standard mode does and shifts up too quickly when backing off to remain flexible and responsive to the throttle, relying instead on quick down-shifts to maintain accelaration. Whilst it appears to solve the hesitancy problem, it certainly degrades the smooth ride and cosseting character of the engine. Guess you can't have it both ways.... Ultimately its down to how you drive. I'm no doddering old fart when it comes to driving but nor am a spotty youth who thrashes his car every where he goes. This gearbox mode may suit some, but for the moment, I'm not so sure its the improvement I was looking for. May be I'll get used to it.... Link to comment Share on other sites More sharing options...
PaulW Posted August 17, 2004 Report Share Posted August 17, 2004 Give it a few days to learn your driving habits too and see if it improves for you. Link to comment Share on other sites More sharing options...
Mort Posted January 27, 2005 Report Share Posted January 27, 2005 Thought I'd resurrect this thread.... I tried the the 00011 code for 6 months and have just gone back to the standard coding. It would be a matter of personal preference but I would not recommend this change especially if you live in an area with lots of hills. After six months , I found that the gearbox would constantly seek to change up regardless of terain whenever a reducing or constant throttle was applied. Hence it would nearly always be riding round in 5th, and on hills, this would require it to change down 2 or 3 gears to accelerate from a given speed. As soon as you back off the throttle, it would change up again. On a long hill it would constantly change up and down and have no real throttle response and would not hold a gear at a constant speed. Apart from starting in 1st and cruising on the motorway in 5th it was rarely in the correct gear for the circumstances... which was rather annoying after a while Now I have set it back to standard, it makes me realise how good the standard setting is. The gearbox now allows the engine to perform at its optimum in nearly all conditions and it rarely needs to change down more than one gear. If you want to try this change to the gearbox, its a worthwhile thing to see what happens, but if you want to improve response from there... go back to the standard setting. Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now