A6 3.0 Bitdi Gearbox Slip PLEASE HELP :(

blackjakle

blackjakle

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Hey all

New here, read a lot of posts and finally thought i would join, got myself a lovely a6 3.0 bitdi, had it mapped and a few extras ; wagner intercooler etc, basically got it to roughly 830 NM torque and the gear box seems to 'slip' at low speeds 1/2/3 gear. anyone else had this? or even have a modded 3.0bitdi with the 8 speed tiptronic?

Cheers in advance

Jack
 
Even at 800Nm your pushing the torque limit of the gearbox. Exceeding it in your case then slippage is to be expected. My bitdi gearbox which is the ZF 8HP55 iirc can be remapped and there are a few tuners who will happily do it.
 
Mo-S3 said:
Even at 800Nm your pushing the torque limit of the gearbox. Exceeding it in your case then slippage is to be expected. My bitdi gearbox which is the ZF 8HP55 iirc can be remapped and there are a few tuners who will happily do it.
Click to expand...

Hey Mo-S3

cheers for the reply, the thing is they are supposed to be rated to 1000nm Max and 900nm for petrol engines, i know JD in holland claim to have gotten them to 950NM with no issues (whether thats true or not...)
i would have thought it could handle over 800 if the manufacturer says 1000nm?

which car have you got out of interest?

Cheers

Jack

Upload 2019 12 7 13 20 50
 
Audidi said:
How do you find out which variant of the 8HP you have?
Click to expand...

thats what i am trying to find out, i have read all over and looks like its the 8hp90 same as RS6 but also read it could be 8hp70, it has to be at least that as the car comes standard with 650NM torque. :(
 
blackjakle said:
thats what i am trying to find out, i have read all over and looks like its the 8hp90 same as RS6 but also read it could be 8hp70, it has to be at least that as the car comes standard with 650NM torque. :(
Click to expand...
Yeah it cannot be rated less than factory 650nm.
I thought I read somewhere that it has a 50nm ceiling, Ie rated to 700nm.
I’d like to check mine also.
 
Audidi said:
Yeah it cannot be rated less than factory 650nm.
I thought I read somewhere that it has a 50nm ceiling, Ie rated to 700nm.
I’d like to check mine also.
Click to expand...

but if thats the case, how are stage 1 maps getting 750 /800 with no issue :( i have messaged someone on here that has a 912nm map see how his gear box is
 
blackjakle said:
Hey Mo-S3

cheers for the reply, the thing is they are supposed to be rated to 1000nm Max and 900nm for petrol engines, i know JD in holland claim to have gotten them to 950NM with no issues (whether thats true or not...)
i would have thought it could handle over 800 if the manufacturer says 1000nm?

which car have you got out of interest?

Cheers

Jack

View attachment 194655
Click to expand...

ive got a bitdi and its the 8hp55 gearbox. The 8hp90 is specific to the RS6

JD engineering tend to over inflate their figures ive heard. Dont quote me on that but speak to bobby singh and he might be able to clarify info about JD.
 
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yeah i saw bobby commenting on another post about JD being a bit unrealistic, do you know how to tag him in this? just to see if he has any insight?

cheers
 
Update, going back in today to reduce the re map believe it or not haha, going back down to stage 1 (under 800NM torque) will keep anyone up to date who is interested.
 
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My uneducated query would be, why does it slip in 1st, 2nd & 3rd at low speed. Doesn't the peak torque come in higher in the revs when under load?

Say accelerating in a higher gear through the rev range?

Let me know how you get on as I am looking to get mine remapped int he new year. I suppose if it is limited to stage one there is no reason for me to fork out for a Wagner intercooler and upgraded rs6 air box.

750Nm isn't anything to be sniffed at, and still 100nm up on standard.
 
So had it mapped back to stage 1 approximately 770NM it’s still “slipping” but not as aggressive, now I am leaning towards 2 things

1 the extra Torque has maybe burned off/perished the oil in the gearbox, so a service and fresh oil may keep the pressure and stop it slipping at low momentum and high torque.

2 it is software related, the extra “comfort” luxury driving setting in the gearbox goes into coasting mode at 15mph to prevent jerking at low speeds, but then as a consequence if I flaw it full power it doesn’t come out of “coasting mode” quick enough.
If one of you can clarify on your standard gearboxes, does it seem to dip in revs to about 700rpm and “disengage” at about 15mph from 3rd to 2nd
That may help :)
 
I haven’t noticed what you describe.
I’ll specifically check next time I’m out.

This slipping is the same in all drive modes and if gearbox is in S/M?
 
You will only notice when you get to a traffic light or roundabout get down to 15mph (or lower) then put your foot down 75-100% throttle to go again, it kind of revs for a while and then bites after a second or 2, hard to explain but you would know if you had it.
But yeah if you can check that would be great, I will get a video and post it up when I get chance, it does do it in sport but not as much to be honest, as I think it might hold the gear a bit longer.
 
I’ve been driving in comfort & efficiency lately and notice the spongy acceleration/response.
Back into dynamic and it improves a fair bit, then out if the blue it will feel immense.
I put this down to gearbox learning.
There’s so much torque it’s easy to want to go balls out and forget you are in comfort/individual (with only sound on dynamic)
 
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Yeah I think it’s different from the gearbox adapting, this feels more like a fault.
 
Seems like you need your gearbox mapped. Maybe not enough clutch pressure is being applied.
 
The Jargen said:
Seems like you need your gearbox mapped. Maybe not enough clutch pressure is being applied.
Click to expand...

yeah I have had it mapped about 10 times, it’s had adaptations, different version of Audi firmware, torque limiter changed etc, the issue is no one seems to have the DAMOS files for this gearbox anywhere, if XHP was available for Audi this would probably fix the issue, but it’s BMW only :(
 
Mine doesn’t do anything like this at 15 mph or under.
You only have 40k on the box? I highly doubt changing the box fluids will resolve it.

when it was mapped, was it done on a dyno? Did you notice this issue soon after?
 
hmmm that is even more odd then, i noticed the issue once i had it mapped to stage 2, but i have since had the gearbox taken back completely to standard :( it feels like maybe standard there is a torque limiter to prevent this slipping? and once it is mapped it allows all the torque to go through he box and slips? once i figure out how to upload a video on here i will! i have some ready.


P.S yes sorry it was done on a dyno with 3 runs, and it was a proper 4wd rolling road dyno.
 
audi upgrades
Audidi said:
Mine doesn’t do anything like this at 15 mph or under.
You only have 40k on the box? I highly doubt changing the box fluids will resolve it.

when it was mapped, was it done on a dyno? Did you notice this issue soon after?
Click to expand...

also here is a thought what reg is yours? do you have the 313bhp or the 320bhp? wonder if there is a difference in gearbox?
 
ok managed to figure out a video :) so does anyone elses do this? watch how it seems to 'disengage' out of gear at 15mph and drops to about 700 revs then when i try and give it some power it just wont bite!
 
blackjakle said:
also here is a thought what reg is yours? do you have the 313bhp or the 320bhp? wonder if there is a difference in gearbox?
Click to expand...
320. I can’t imagine that it would as it would be a substantial increase in torque tolerances. 750 should be for 313, 320 & 326 models
 
Which softwareversion do you now have on your gearbox?

The claim of JD is valid. Other tuners (vagtechniek, VVT) get almost the same results.

Get your gearbox updated to the latest sw version.
 
RJ-8V said:
Which softwareversion do you now have on your gearbox?

The claim of JD is valid. Other tuners (vagtechniek, VVT) get almost the same results.

Get your gearbox updated to the latest sw version.
Click to expand...

yep tried that, been back and forward to my tuner, they have added the latest version and also tried older versions, the video above still seems to happen, seems like it’s entering this comfort /coasting mode and cannot find a way to disable ! :(
 
blackjakle said:
yep tried that, been back and forward to my tuner, they have added the latest version and also tried older versions, the video above still seems to happen, seems like it’s entering this comfort /coasting mode and cannot find a way to disable ! :(
Click to expand...
Bring your car back to stock. Then start from the beginning. I think it's the ecu mapping. Did you also check the coding of the gearbox?
 
Yeah that was the last solution we tried, so brought it back to stage 1 to see how it is for a couple of weeks, as we thought the extra power of the torque was causing it, perhaps not.
And what do you mean coding? As in the gearbox code? ZF8HP55?
 
blackjakle said:
Yeah that was the last solution we tried, so brought it back to stage 1 to see how it is for a couple of weeks, as we thought the extra power of the torque was causing it, perhaps not.
And what do you mean coding? As in the gearbox code? ZF8HP55?
Click to expand...
I meant completely back to stock. So no stage 1 etc. Original softwareversion of both gearbox and ecu.
 
Yeah I tried gearbox completely back to stock but haven’t tried taking the stage 1 off, the tuner didn’t think that had anything to do with it, I guess il try that next, it just means taking another day of work to get it in and get it mapped then testing etc.
 
blackjakle said:
Yeah I tried gearbox completely back to stock but haven’t tried taking the stage 1 off, the tuner didn’t think that had anything to do with it, I guess il try that next, it just means taking another day of work to get it in and get it mapped then testing etc.
Click to expand...
I spoke with my collegae about your problem. He also says everything back to stock. Problem is with the stage1, not the gearbox.
 
RJ-8V said:
I spoke with my collegae about your problem. He also says everything back to stock. Problem is with the stage1, not the gearbox.
Click to expand...

yeah i think you may be correct, getting it back to standard and starting again i think, so guessing if it still happens then, it a gearbox fault? if it doesnt its the map?
 
blackjakle said:
yeah i think you may be correct, getting it back to standard and starting again i think, so guessing if it still happens then, it a gearbox fault? if it doesnt its the map?
Click to expand...
If it doesn't then the map. I've seen bad tune effects before. Also there isn't a software tune for the gearbox, does not exist. The gearbox can hold up to 1100nm :)
 
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yeah i have ready they are good to 1000nm, it was just the fact there are so many variants of the h8p IE:
ZF8HP55 - 550nm
ZF8HP70 - 700nm
ZF8HP90 - 900nm (in the RS6)

i wondered if mine couldn't take it, but judging by the numerous posts from JD enginerring etc people are going well over 700nm!
 
blackjakle said:
yeah i have ready they are good to 1000nm, it was just the fact there are so many variants of the h8p IE:
ZF8HP55 - 550nm
ZF8HP70 - 700nm
ZF8HP90 - 900nm (in the RS6)

i wondered if mine couldn't take it, but judging by the numerous posts from JD enginerring etc people are going well over 700nm!
Click to expand...

So is the difference between the 3 gearbox model variants to do with software rather than the actual mechanicals?


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