S8 4.0t vs. A8 4.0t engine differences?
#91
A8 can go stage I
S6 can go to stage III
S8 can go to stage II
that's the software that APR suppprts right now anyways. A8 in my opinion has a nicer interior and rides softer. S8 is smaller and faster, sportier suspension and brakes. S6 is smaller and could be made faster. Stage III S6 > Stage II S8.
S6 can go to stage III
S8 can go to stage II
that's the software that APR suppprts right now anyways. A8 in my opinion has a nicer interior and rides softer. S8 is smaller and faster, sportier suspension and brakes. S6 is smaller and could be made faster. Stage III S6 > Stage II S8.
#92
AudiWorld Member
1. Different piston (crown design)
2. Lower compression ratio in S8, accommodating higher boost
3. Larger diameter main bearing
4. A difference in crankshaft material
5. Addition of an auxiliary oil cooler (two vs. one oil coolers)
6. Larger main radiator
7. Dual-branch air intake (one for each bank/turbo)
8. Valve timing (camshaft profile) difference
9. Larger turbo compressor wheels
For these reasons, unless you go nuts with a custom overhaul, a Stage III A8 (if will ever exist) will still not outperform the S8 Stage 1 (or II) - the reason APR hasn't pushed towards Stage III (other than there's little/no demand) is cooling. When you start pumping out any more power than you're currently producing, heat becomes a big issue. I'm all for achieving the unachievable but you'll struggle to do so economically. Yes, we went to the moon but we spared no cost. I can rattle off a few custom shops who, for $50+ grand, will put 1200 hp in your A8. You can probably get it to 220!
As an aside - have you upgraded your brakes and tires? Most tires aren't rated to handle those speeds for any length of time (particularly with a heavy car like the D4).
The following users liked this post:
09S5 (07-09-2021)
#93
Thanks for all the good info!
Not looking for 1200hp just about 650. I’m hoping those silly rabbits get back to me regarding the turbos, cooling, intake and tune.
What shops do you recommend?
Not looking for 1200hp just about 650. I’m hoping those silly rabbits get back to me regarding the turbos, cooling, intake and tune.
What shops do you recommend?
#95
AudiWorld Member
Here's an example...
https://www.motor1.com/news/178564/a...lf-mile-video/
#96
APR already told me to pound sand, respectfully of course.
Silly Rabbit Motorsport | Audi S4, RS4, RS6 | Porsche Turbo Upgrade
if you want something weird done, go to Vegas!
Silly Rabbit Motorsport | Audi S4, RS4, RS6 | Porsche Turbo Upgrade
if you want something weird done, go to Vegas!
#97
Audiworld Junior Member
APR already told me to pound sand, respectfully of course.
Silly Rabbit Motorsport | Audi S4, RS4, RS6 | Porsche Turbo Upgrade
if you want something weird done, go to Vegas!
Silly Rabbit Motorsport | Audi S4, RS4, RS6 | Porsche Turbo Upgrade
if you want something weird done, go to Vegas!
#98
AudiWorld Member
MTM has some options for you as well. This is old news now, but they have tuned the S8 to over 800-hp. It offers up near Veyron levels of performance. And naturally, the price is still shocking. I believe it works out to be more than 100k in upgrades
https://www.autoevolution.com/news/m...ery-92722.html
https://www.autoevolution.com/news/m...ery-92722.html
#99
AudiWorld Super User
Join Date: Oct 2003
Location: Northern VA / DC Area
Posts: 5,299
Likes: 0
Received 3 Likes
on
3 Posts
MTM has some options for you as well. This is old news now, but they have tuned the S8 to over 800-hp. It offers up near Veyron levels of performance. And naturally, the price is still shocking. I believe it works out to be more than 100k in upgrades
https://www.autoevolution.com/news/m...ery-92722.html
Best,
Last edited by Ritz; 08-29-2018 at 05:40 PM.
#100
AudiWorld Super User
Join Date: Oct 2003
Location: Northern VA / DC Area
Posts: 5,299
Likes: 0
Received 3 Likes
on
3 Posts
It's unfortunate that their website is so dysfunctional. I've been trying to get info on what they have for Audi cars for 10 minutes and get a spinning icon.
Actually, it's more like someone playing a xylophone...
Actually, it's more like someone playing a xylophone...