TD...i...don't get it

[Kenquattro]

Having drove a fair few modern diesels, the two big negatives for me are the narrow power band, but more importantly the sound of them. They just don't do it for me, much like the vast majority of four potters. That's why I would go for a 2.7T gas guzzler over the far more economical 2.5 TDI quattro A6....and balls to the MPG!

[Coxy]

just reading this weeks Autoexpress (RS3 article) and they mention the Clubsport TDi concept car which was launched in 2008.

First I've heard of that one.

[BW2309]

Originally Posted by Coxy

just reading this weeks Autoexpress (RS3 article) and they mention the Clubsport TDi concept car which was launched in 2008.

First I've heard of that one.

If I remember right the ClubSport was an A3 based thing with a highly tuned 2.0TDi???
Looked a bit mingin in red/white??

All well and good and there are already fast TDi's but why not RS models?? Don't get me wrong, I LOVE the petrol engines in RS models, it just seems strange they won't comit to making the RS' availible with derv power when their racing cars are!!

[msh]

Originally Posted by pimpdriver

But diesel cars usually cost more, Porsche Cayenne diesel is about 3k more expensive than the petrol car, and you have to do about 66000 miles before it becomes economically viable.

And they only have "puff" between 2 -5000 rpm whereas petrols can be made to scream up to 9000 rpm.

So? Most turbodiesels puts out their maximum torque at about 2k rpm, your favourite screamers at 6-7k rpm. Are u driving petrol engined car just like that in traffic?
There is also fact that diesels for sale is detuned - for reliability purposes, to let buyers buy bigger engines that have higher price tag, and also - if there would be many diesels with their full potential unlocked on road, who would buy petrol to be "looser"? I presume, if 4.2 TDI [or 4.0 or whatever, I don't know new engines] have similar strenght like old diesels, it can put out something like 800-900 nm and over 400 bhp. 4.2 FSI wouldn't be competive against that.

[quattrokid]

there isnt a demand for a high performance diesel, Audi are pushing diesel for their road car sales.
The Clubsport was a concept showing a tuned 2.0tdi engine but the R8 V12tdi has been shelved for now.
IF I was going to buy a high performance engine, I want to HEAR it rev to 7-9k revs, not up changing between 2-3k revs, also as said the power band is very narrow with diesels.

besides the torque of bigger diesels is far better than high revving engines anyway BUT then the transmission cant take it
so its a split between developing a transmission that wont tie itself into a box of knots at the first hot start from the lights and an engine that can be reliable and rev its tits off
the R8 V12tdi is shelved until someone develops the transmission to handle the massive torque generated, the box fitted to the concept car would last 100 yards if it was given the beans, ( quote Autocar showpiece article of the car in Miami).

[msh]

Originally Posted by quattrokid

IF I was going to buy a high performance engine, I want to HEAR it rev to 7-9k revs, not up changing between 2-3k revs, also as said the power band is very narrow with diesels.

If traditional piston engined diesel would be capable of such high revs, I wouldn't like to hear such awful sound
Very narrow powerband? Audi turbocharged petrol engines have similar powerband, only it's higher on clock, very impractical.
Actually the problem is that ppls compare high performance diesels with high performance petrol engines, taking petrol as standart - high revving, smooth, with nice sound, fuel hungry, bought by ppls who can afford it. While diesel is economical and comfortable daily driver, but when u put your foot down, it gives u performance of sportscar.
P.S. For me sound is only reason why not to get 2.5 TDI in future for my A90q, but gains are spectacular - fuel economy something like 5l/100 km on road and 400-500 nm of torque provided by the same engine - 20vt can provide such torque but which petrol engine can provide fuel mileage like that? Maybe very small FSI engine...

[20vcqdriver]

Going back to basics here I think the reason Audi have not brought out (for example)an RS4 diesel is quite simply because no-one would buy the petrol version. I mean a 4.2 TDI with suitable tall gearing and all that torque against the high revving much thirstier 4.2 petrol... I know which I'd go for, especially with fuel prices sneaking back up again...
I do love my petrol 20Vt in the Cq though as it can be driven like a diesel (max 295lb/ft torque at 1950rpm) but can be revved upto 7000rpm if the mood takes me passing most modern cars in the process. The main downside is that if I drive it this way it reduces my mpg from 30 to 12mpg. so as the month progresses it gets driven more and more like a diesel until I get paid again, then it's fun time all over again... My tuned Passat TDi average on the other hand never drops below 30mpg no matter how hard you drive it.
If Audi do bring out an R8 Diesel, I think they probably realise they'll lose 90% of the sales of the petrol version.

[quattrokid]

fair point about the R8 TDI.. BUT who can afford the price of a V12 tdi and even so it would be a limited halo model anyway.
a V8 tdi R8 OR a V10 for that matter since it exists in the VW empire engine draw

down to bean counters and consumer demand I recon