performance figures for the Rover 4.0 V8 Rush?
Discussion
Why do these two venues always have events on the same days 
If you want a dax for trackdays i'd go for the cossie version (of course i would i've got one 
)
The westfield s-eight's are quick in a straight line but round the bends they had no chance against my cossie rush.
I've driven a 3.9 v8 rush when i was buying mine, and although it feels quick, its far more sedate than the cossie.
I'm bringing the rush up to leeds in march, if you can wait that long i'll take you out in it and show you what i mean
Tim.
) The westfield s-eight's are quick in a straight line but round the bends they had no chance against my cossie rush.
I've driven a 3.9 v8 rush when i was buying mine, and although it feels quick, its far more sedate than the cossie.
I'm bringing the rush up to leeds in march, if you can wait that long i'll take you out in it and show you what i mean
Tim.
enginearin said:
The westfield s-eight's are quick in a straight line but round the bends they had no chance against my cossie rush.
Why is that so, when I've always read that the Rover engine is actually lighter than the pinto that forms the basis of a cossie lump? That should make a Rover engined car lighter/more agile in the bends, or am I missing something important???
Chris
On the basis of your weight info i'm not sure why we were so much quicker. maybe i'm just michael shumacher posting under another name
seriously though it was my first public trackday, and i was very surprised to find that the car was that much quicker than most other things there.
more surprising at the time was the fact that we (2up) were quicker than a couple of 2up megabusa's on the straights too, only when i sat down and did the power to weight calcs did it become less of a surprise
330bhp dax vs 180bhp busa loaded up with same weight in passengers = dax approx 50bhp/ton more than busa (from memory, i'm pretty sure i posted it up here somewhere at the time!!))
round the twisty curborough sprint course the dax was only about 1/2sec slower than a couple of busa's too.
Tha dax really loses out on fuel consumption though, i get about 6-8mpg on the track (i burnt 90 litres in a day at bruntingthorpe!!!)
basically having driven both cars, if you want a lazy power (read tons of low down torque) cruiser go for the standard 4.litre V8 if you want a particularly exhilerating (spelling???) track car go for a 330bhp cossie
or a turbo-busa
edited to say mine's 2wd
>> Edited by enginearin on Wednesday 21st January 16:54
seriously though it was my first public trackday, and i was very surprised to find that the car was that much quicker than most other things there.
more surprising at the time was the fact that we (2up) were quicker than a couple of 2up megabusa's on the straights too, only when i sat down and did the power to weight calcs did it become less of a surprise
330bhp dax vs 180bhp busa loaded up with same weight in passengers = dax approx 50bhp/ton more than busa (from memory, i'm pretty sure i posted it up here somewhere at the time!!))
round the twisty curborough sprint course the dax was only about 1/2sec slower than a couple of busa's too.
Tha dax really loses out on fuel consumption though, i get about 6-8mpg on the track (i burnt 90 litres in a day at bruntingthorpe!!!)
basically having driven both cars, if you want a lazy power (read tons of low down torque) cruiser go for the standard 4.litre V8 if you want a particularly exhilerating (spelling???) track car go for a 330bhp cossie
or a turbo-busa edited to say mine's 2wd
>> Edited by enginearin on Wednesday 21st January 16:54
here's the post r.e. power to weight:
"the thing with the bike engined cars and big drivers is that the dry power to weight ratio of the cars is great, with people in it drops drastically.
e.g. busa = 180bhp and 450kg = 400bhp/ton
busa + me and passenger = 630kg = 285bhp/tom
dax = 300bhp and 650kg = 461bhp/ton
dax + me and passenger = 830kg = 361bhp/ton
in % loss
busa = -29% power to weight
dax = -22% power to weight
basically bike engined cars and big passenger loads don't work too well. "
"the thing with the bike engined cars and big drivers is that the dry power to weight ratio of the cars is great, with people in it drops drastically.
e.g. busa = 180bhp and 450kg = 400bhp/ton
busa + me and passenger = 630kg = 285bhp/tom
dax = 300bhp and 650kg = 461bhp/ton
dax + me and passenger = 830kg = 361bhp/ton
in % loss
busa = -29% power to weight
dax = -22% power to weight
basically bike engined cars and big passenger loads don't work too well. "
enginearin said:
basically bike engined cars and big passenger loads don't work too well. "
Either I'd better steer clear of bike engines or get down the gym!
Seriously though, your point is a good one, and a strong argument for thinking carefully before jumping on the BEC wagon.
Does your Rush have the camber compensating front suspension? I'd imagine that would have quite an impact. I'd love to see a back to back track test between two identical cars, same driver, except one with CC susp and one-without to really understand the difference it makes.
Chris
my rush doesn't have the cc suspension (its a bit too old for that unfortunately). i don't fancy getting it retro fitted either (loadsa cash!!), i've just bought some super sticky kumho tyres for the front of the rush which has made the world of difference to braking and lateral grip (back tyres goin on AFTER my driving tuition day in march!!).
Duncan Cowper has been using a cc suspension turbo busa in some sprint series (can't remember which one), anyway he blitzed everything he came up against including single seater pilbeams and the like. although a spectacular achievement i dont think that it can be attributed solely to the cc suspension (777bhp/ton might have a lot to do with it )
I too reckon that we need a back to back test to prove the benefits of cc. CCC magazine didn't like the feel of the road car with cc system fitted (said it had too much body roll, with wheels still upright) but they thought duncans race car was awesome.
The turbo busa is the best bike engine car available imho, full boost is available from 4000-10500rpm. With that amount of revs available its got to be nothing like driving a normal turbo car, my dax has full boost from about 3500 to 5500-6000.
I'd love to have a go in it
Duncan Cowper has been using a cc suspension turbo busa in some sprint series (can't remember which one), anyway he blitzed everything he came up against including single seater pilbeams and the like. although a spectacular achievement i dont think that it can be attributed solely to the cc suspension (777bhp/ton might have a lot to do with it
) I too reckon that we need a back to back test to prove the benefits of cc. CCC magazine didn't like the feel of the road car with cc system fitted (said it had too much body roll, with wheels still upright) but they thought duncans race car was awesome.
The turbo busa is the best bike engine car available imho, full boost is available from 4000-10500rpm. With that amount of revs available its got to be nothing like driving a normal turbo car, my dax has full boost from about 3500 to 5500-6000.
I'd love to have a go in it
lexsport,
it might be a combination of the engine being further back and my considerable bulk just in front of the back axle
still not sure though, i'm not that well up on chassis dynamics. i reckon that were gonna go even quicker round the bends with these new sticky tyres.
i can't wait to get out in it again.
it might be a combination of the engine being further back and my considerable bulk just in front of the back axle
still not sure though, i'm not that well up on chassis dynamics. i reckon that were gonna go even quicker round the bends with these new sticky tyres.
i can't wait to get out in it again.
Book me in for a ride will ya 
enginearin said:
If you want a dax for trackdays i'd go for the cossie version (of course i would i've got one
The westfield s-eight's are quick in a straight line but round the bends they had no chance against my cossie rush.
I've driven a 3.9 v8 rush when i was buying mine, and although it feels quick, its far more sedate than the cossie.
I'm bringing the rush up to leeds in march, if you can wait that long i'll take you out in it and show you what i mean
Tim.
Depends what the Seight has had done to it. Stock ones are considerably done on power to your Cossie, and since most get used as road cars, they are not usually set up for it, or wearing the right boots.
Holding onto a barrel of torque through a corner is easier than looking for the next gear IMO.
Gassing Station | Kit Cars | Top of Page | What's New | My Stuff