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A8 / S8 (D2 Platform) Discussion Discussion forum for the D2 Audi A8 and S8 produced from 1994-2002

A8 4.2 turbo kit? Supercharger?

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Old 12-26-2006, 02:01 PM   #1
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Default A8 4.2 turbo kit? Supercharger?

Hi from Australia. I hope Santa was good to you...I have a 2000 model 40 valve 4.2 engine. Does anybody know where I could get a turbo or supercharger kit? ...and does anybody know why the D3 RS6 is only 32 valves and turbo'd. Maybe the guys at Audi head office know something that we don't know...why are the 4.2 turbos 32 vales? Anyhow, any info/advice would be greatfully accepted, like, do I need to change the piston heads, bearings, my brain? Should I buy a used 4.2 turbo (if there is one!) and re-do it...or just buy another 4.2 engine and start from scratch. What I did find out was that the gearbox in the 2000 A8 is the same as the one in the twin-turbo RS6 etc...so at least I don't need to change that (until it goes BANG!)...anyways, send any info from around the world and have yourselves a Happy New Year...regards, Oscar from Sydney..
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Old 12-26-2006, 06:15 PM   #2
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Default There are none. Reputedly ARP is working on one. Prob for S4 first.

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Old 12-27-2006, 06:31 AM   #3
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Default There has been a couple bi-turbo s8's IIRC. One in Brazil and one in Germany

Your best shot is to custom jobby one. The problem is finding someone to redo your ECU.

As for the S/c there is yet to be a legitimate one available, but if you can spare your car for a couple months and have about $15k layin around, I will bet you could talk PaulW.


PES tuning is also, supposedly, working on one.

MTM has one for the D3 but not for the D2.
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Old 12-27-2006, 12:03 PM   #4
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Default Here's my basic calcs for a 450 HP output

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Old 12-27-2006, 01:04 PM   #5
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Default did you ever do the calcs for a 40v?

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Old 12-27-2006, 01:33 PM   #6
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Default STS has opened a HQ in Australia. They have a generic remote turbo kit.

They can be set up for between 5 and 15 pounds of boost.

In 2005, STS received General Motors' Performance Engineering Excellence award for this system.

They boast having one of the coolest charge temps in the industry.

Many kits sold, many happy people.

Let us know what you do .. no A8 people have tried this yet.

You can google STS Remote Turbo for the site link.
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Old 12-27-2006, 01:59 PM   #7
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Default No, but the only thing that would change is 11:1 CR

Which changes the heat generated due to compression on one of the pages.
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Old 12-27-2006, 05:54 PM   #8
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Default is there really that much of a difference between 10.8:1 and 11:1?

It seems minor, but I know nothing of engine compression.
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Old 12-27-2006, 06:31 PM   #9
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Default For some unknown reason the last straw is always heavier than the first.

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Old 09-12-2013, 09:55 PM   #10
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Wow I just came across one of my old posts...FYI I did eventually do the supercharger kit and finished up putting much of what I did at this link:
http://www.audiaddict.net/viewtopic.php?f=37&t=1628
I blew up my first engine after 50,000km...and did a full rebuild...now on a trek to replace the supercharger with twin turbos...here we go again...regs, Oscar from Australia
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Old 09-13-2013, 03:25 AM   #11
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Quote:
Originally Posted by dogolf View Post
Wow I just came across one of my old posts...FYI I did eventually do the supercharger kit and finished up putting much of what I did at this link:
http://www.audiaddict.net/viewtopic.php?f=37&t=1628
I blew up my first engine after 50,000km...and did a full rebuild...now on a trek to replace the supercharger with twin turbos...here we go again...regs, Oscar from Australia
Hey how are ya? Greetings from New York, I've watched a bunch of videos on youtube of a silver 2000 A8L in Australia, curious if that's yours.

I've got an '02 L and I have the desire to make it go fast (just no money right now ) I remember reading about you blowing up the previous engine and was hoping you'd give me some pointers so I don't do the same lol Did you actually lower the compression and it still went boom??
Cheers
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Old 09-13-2013, 06:20 AM   #12
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Sounds fun!

My local shop sells the PES S/C kit. They warranty all their work for 36 months/36,000 miles, including performance mods (actually any service/repair performed there for that matter). I don't know that I feel like dropping $8500 + install, but would sure love to feel that power in the D2.
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Old 09-13-2013, 05:56 PM   #13
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Yeah, too many ricers on the road that need to learn a thing or two about how great our A8's are

$8500..... out of my budget for sure although I trust it would be worth it. I've got to do my own work though to justify owning German lux. Maybe one of the 'simplest' options for me would be to find a wrecked RS6 and swap the engine/trans.
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Old 09-14-2013, 04:48 AM   #14
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Supercharging for under $500:

Home Depot Stage 2 >>

Click the image to open in full size.
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Old 09-16-2013, 05:12 AM   #15
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Supercharging for under $500:

Home Depot Stage 2 >>

Click the image to open in full size.
Only trouble is you've gotta get out and open the hood to start up your superchargers in the morning. Unless your mechanical genius can come up w/ a way to rig a switch in the cabin.........
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Old 09-16-2013, 07:18 AM   #16
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Originally Posted by nossisnave View Post
Only trouble is you've gotta get out and open the hood to start up your superchargers in the morning. Unless your mechanical genius can come up w/ a way to rig a switch in the cabin.........
That's where the trained squirrels come in to play
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Old 01-25-2014, 05:36 PM   #17
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Hey dogolf
I'm curious about how your modding affected your transmission. Just reading through some of your posts on AudiAddict and you mentioned the tuned motor putting out around 400 hp. ZF is of the opinion that the gearbox is capable of ~300. Did you experience any transmission troubles after the hp increase?

Cheers
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Old 01-25-2014, 06:18 PM   #18
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Hey dogolf
ZF is of the opinion that the gearbox is capable of ~300.
Cheers
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Yet Audi uses exactly the same transmission* in 360 hp D2 S8's, with statistically no failures any earlier than 310 hp D2 A8's of the same years.

* The only difference with D2 S8 transaxles are the final drive ratios...all other parts identical and individual gear ratios the same.
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Old 01-25-2014, 06:41 PM   #19
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Originally Posted by silverd2 View Post
Yet Audi uses exactly the same transmission* in 360 hp D2 S8's, with statistically no failures any earlier than 310 hp D2 A8's of the same years.

* The only difference with D2 S8 transaxles are the final drive ratios...all other parts identical and individual gear ratios the same.
Good point. I suppose ZF has to have a comfort zone and rate it lower than it actually could handle. I'm just curious what my ceiling is
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Old 01-25-2014, 11:29 PM   #20
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Does the W12 uses the same transmission? When I was looking I saw some offers of W12 for quite cheap. That one has 420 hp and 550 NM stock, probably too much for 5hp24a.
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Old 01-25-2014, 11:29 PM
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