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  #1  
Old 6th September 2017, 09:14 PM
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Default Rolling Road interested to know

Has anyone had their S8 D2 on a rolling road or mapped, did it make stock power figures? or less?
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Old 6th September 2017, 09:31 PM
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Not my S8, but I did have my first D2 A8 4.2 remapped.

I was invited down to Superchips headquarters on a training day, due to my automotive development associations (long story), and got a free remap as a result.

Bearing in mind these were Superchip's best remappers, the first attempt actually lost about 10bhp. After several attempts they managed an increase of about 5bhp, which of course was barely noticeable on the road.
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Last edited by moltuae; 7th September 2017 at 06:37 AM.
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Old 6th September 2017, 09:54 PM
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I had my D2 on the dyno at MRC, made factory 355 hp with 120k miles on the clock, I was very surprised was expecting a lot less. The often quoted 360hp is actually in ps, its 265kw in the manual.

Last edited by Goran; 6th September 2017 at 09:59 PM.
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Old 8th September 2017, 03:29 PM
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Quote:
Originally Posted by Goran View Post
I had my D2 on the dyno at MRC, made factory 355 hp with 120k miles on the clock, I was very surprised was expecting a lot less. The often quoted 360hp is actually in ps, its 265kw in the manual.
Goran thats good results, i've heard MRC are the guys to use for mapping etc, did my stage 2 rs6 c5 before i bought it and went very well, do you think they could do much with an S8 D2? I suppose it would confirm if the car is healthy was it stock your car?
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Old 8th September 2017, 03:31 PM
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Quote:
Originally Posted by moltuae View Post
Not my S8, but I did have my first D2 A8 4.2 remapped.

I was invited down to Superchips headquarters on a training day, due to my automotive development associations (long story), and got a free remap as a result.

Bearing in mind these were Superchip's best remappers, the first attempt actually lost about 10bhp. After several attempts they managed an increase of about 5bhp, which of course was barely noticeable on the road.
Moltuae, is your current S8 stock? ever tempted to see what its running?
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Old 8th September 2017, 04:20 PM
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Quote:
Originally Posted by RS6 View Post
Moltuae, is your current S8 stock? ever tempted to see what its running?
It is stock. It would be tempting to know but, coming from my previous 4.2 A8s, which were dyno'd (but less powerful), the noticeable difference in the S8's power seems about right for the rated power.

I know a few garages with rolling roads. In fact I used to repair and maintain their rolling roads for them, but most of those aren't 4-wheel dynos. I do know one owner of a 4-wheel dyno but it's never been properly maintained or calibrated so I wouldn't trust its accuracy.

I am considering investing in a new 'sportier' exhaust system some time in the next year or two, so I might be tempted to pay for a 'before and after' roll, if I can find a local garage with a decent 4-wheel dyno.
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  #7  
Old 8th September 2017, 06:51 PM
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Quote:
Originally Posted by RS6 View Post
Goran thats good results, i've heard MRC are the guys to use for mapping etc, did my stage 2 rs6 c5 before i bought it and went very well, do you think they could do much with an S8 D2? I suppose it would confirm if the car is healthy was it stock your car?
I would definitely use MRC if I was to get mine mapped. I was planning to originally but I am not so sure any more. The power increase would be tiny I think, its not easy to get much out of a NA engine especially from a German one thats already been upgraded by the factory with a different cam, low friction ancilliaries, etc, to get the power increase compared to a A8.

Also having test driven RS4s, an RS6 and a Tesla made me realise if I want a huge power jump I can feel I have to get a different car. Currently I am very happy with the D2, I have accepted it for what it is.

The other, perhaps easier way to get a bit more noticable oomph is to lose weight, for example lightweight battery could save 20kg, custom exhaust could lose around 15kg, lightweight front discs around 7kg, rears around 3kg.
Lighter alloy wheels could lose up to 25kg if you count the spare too, depending how much you are prepared to spend.
Switching to manual seats for example Audi TT seats could lose another 20kg.
However I have partially given up on this too and I even bought a pair of TT seats, now gathering dust in the shed.
To make the D2 a much faster car would take something radical like swapping in an RS6 4.2 engine, manual trans, etc. Or going all out reducing weight and maxing the power of the stock engine. I am guessing either route would easily cost over £10k

Last edited by Goran; 8th September 2017 at 06:55 PM.
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Old 8th September 2017, 09:26 PM
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Quote:
Originally Posted by Goran View Post
I would definitely use MRC if I was to get mine mapped. I was planning to originally but I am not so sure any more. The power increase would be tiny I think, its not easy to get much out of a NA engine especially from a German one thats already been upgraded by the factory with a different cam, low friction ancilliaries, etc, to get the power increase compared to a A8.

Also having test driven RS4s, an RS6 and a Tesla made me realise if I want a huge power jump I can feel I have to get a different car. Currently I am very happy with the D2, I have accepted it for what it is.

The other, perhaps easier way to get a bit more noticable oomph is to lose weight, for example lightweight battery could save 20kg, custom exhaust could lose around 15kg, lightweight front discs around 7kg, rears around 3kg.
Lighter alloy wheels could lose up to 25kg if you count the spare too, depending how much you are prepared to spend.
Switching to manual seats for example Audi TT seats could lose another 20kg.
However I have partially given up on this too and I even bought a pair of TT seats, now gathering dust in the shed.
To make the D2 a much faster car would take something radical like swapping in an RS6 4.2 engine, manual trans, etc. Or going all out reducing weight and maxing the power of the stock engine. I am guessing either route would easily cost over £10k
Or Nitrous Oxide.........
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Old 8th September 2017, 10:26 PM
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I did think of Nitrous oxide and while it is fairly inexpensive to install the usage costs are too high.

So I looked at alternative. You could use compressor part of turbo hooked up to electric motor to give you on demand boost. Initial outlay will probably be higher but running costs very little. It is a while since I looked at it so things may have improved now. but I seem to remember that about £750 investment would give you 50% more power for 2 minutes with 30 minute re-charge time with which is compareable to 11lb NO2 bottle at about £50 for the same 2 minutes of boost.
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Last edited by ainarssems; 8th September 2017 at 10:32 PM.
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Old 11th September 2017, 11:23 AM
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Interesting idea, I like it
I assume the electric motor would run off a separate battery no the alternator, hence the re-charge time?

Only other question, would the engine be able to take it?

Lol, sorry, not the only question, would you still need to intercool the air?

Looks like Borg warner already have something.

https://www.borgwarner.com/docs/defa....pdf?sfvrsn=14

Last edited by Goran; 11th September 2017 at 11:26 AM.
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