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D2 - Everything else Anything that doesnt fit elsewhere

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  #51  
Old 12th May 2019, 11:55 AM
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The_Laird The_Laird is offline
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Quote:
Originally Posted by MikkiJayne View Post
The thought occurs that it might be worth making an inventory of all the good / new / unusual stuff you've fitted to it, then we can consider what effort might be needed to swap that over to a replacement D2.
Might be a much shorter list if he made an inventory of the new stuff he hasn’t fitted to it!
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  #52  
Old 12th May 2019, 12:03 PM
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Absolutely gutted to see this please keep us posted with updates hopefully something can be done to repair it or at least transfer parts to another car
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  #53  
Old 12th May 2019, 02:11 PM
ainarssems ainarssems is offline
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Gearbox ratios are a bit of letdown on S8, it's not really a track car with the size and weight and auto box so no need for such short 5th gear.

Same with B6 S4 very short 6th gear but why? Its limited to 155mph and can do 153mph in 5th before hitting rev limiter so what's the point, it's not like 6th gear will offer any performance benefits, it's only there for cruising so why not make it so that car has 2000 rpm @70mph instead of 3000rpm? At least they changed it on later S cars with them being 1800-2000rpm @70mph. If I was going to keep S4 long time I would probably swap in 6th gear from TDI .

Anyway rant over and pdfs attached with some D2 gearbox ratios
Attached Files
File Type: pdf gears.pdf (201.6 KB, 20 views)
File Type: pdf gear2.pdf (400.7 KB, 18 views)
File Type: pdf gear3.pdf (400.7 KB, 19 views)
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  #54  
Old 12th May 2019, 08:10 PM
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Thanks for this Ainars,

Do I understand correctly from these PDFs that
5th gear on 3.7 is longer than on standard non-S8 4.2,
delivering lower rpm on same motorway road speed?

Cheers.
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  #55  
Old 12th May 2019, 08:19 PM
HPsauce HPsauce is offline
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Hopefully not digressing too far, but I think the S8 gear ratios are designed to get an "unrestricted" S8 to the highest top speed it can possibly achieve, somewhere around 175mph.
i.e. max power at highest revs just overcomes air/rolling etc. resistance.
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  #56  
Old 13th May 2019, 05:56 AM
ainarssems ainarssems is offline
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Quote:
Originally Posted by notorious View Post
Thanks for this Ainars,

Do I understand correctly from these PDFs that
5th gear on 3.7 is longer than on standard non-S8 4.2,
delivering lower rpm on same motorway road speed?

Cheers.
Smaller ratio number means longer gear but you need to take into account also intermediate and final drive ratios. It's a bit hard to tell, probably best to put all the data in excel spreadsheet to multiply all different ratios and to show the total for each box and gear.
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  #57  
Old 13th May 2019, 12:09 PM
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Could a 3.7 box be mated with a 4.2 engine? best of both worlds.
I completely agree about the 5th gear ratio in the S8, its one thing I really found annoying on my previous S8, at 70mph almost 3000rpm.
Makes no sense for top speed either, all the modding guys in the audu srs and rs246 forums are swapping in low ratio gears for higher top speed.
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  #58  
Old 13th May 2019, 12:30 PM
MikkiJayne MikkiJayne is offline
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You can't swap autos between engines because the ECU and TCU know which one of each they should be talking to. Plus the 3.7 has a 5hp19 and the 4.2 has a 5hp24.

My solution would be to manual swap an S8 with a TDI gearbox. You get the same 1-5 as the auto, plus a super-high cruising gear. This is the result:

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  #59  
Old 13th May 2019, 02:14 PM
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Oh that's a shame about the auto boxes.
I'm with you all the way about the manual swap
but I understand people who want to keep the auto box, its very smooth and nice for relaxed driving. I still miss it a bit sometimes.
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  #60  
Old 13th May 2019, 02:20 PM
paulrstaylor paulrstaylor is offline
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Quote:
Originally Posted by MikkiJayne View Post
You can't swap autos between engines because the ECU and TCU know which one of each they should be talking to. Plus the 3.7 has a 5hp19 and the 4.2 has a 5hp24.

My solution would be to manual swap an S8 with a TDI gearbox. You get the same 1-5 as the auto, plus a super-high cruising gear. This is the result:

All well and good but 730 miles at 16mph would be a painful 45 hours in an S8
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