I'm not a very smooth or consistent driver. :(

No kidding! Sheesh! :shocked:

No kidding! Sheesh! :shocked:

Admittedly I'm not quite as bad as Chris but hey, gotta start somewhere :(

Admittedly I'm not quite as bad as Chris but hey, gotta start somewhere :(

:slap:

:P:rofl:

Chris

Song by Yazz from August 1988

:rofl:

Chris

But as soon as you go beyond 4000rpm power drops whereas changing up sooner would mean your increasing power & your totally excluding the fact that at those revs Torque is low however changing up sooner you have the blend of torque & power increasing.

1. The gradient of power is irrelevant. It's the absolute power value that is important.

2. Yes, I am ignoring the torque - power is derived from torque, so whatever that torque value is doesn't really matter.

Rob.

1. The gradient of power is irrelevant. It's the absolute power value that is important.

2. Yes, I am ignoring the torque - power is derived from torque, so whatever that torque value is doesn't really matter.

Rob.

But Torque and Power are directly linked

i.e.

BPH = [Torque/5252]*RPM

or

Torque = [5252*BHP]/RPM

So on your point 1 you are stating that youd ideally want to change up hitting max power i.e. 4000rpm however any rpm above this power is falling your rate of change of acceleration is decreasing whereas if you had changed up sooner your rate of change of acceleration would be increasing

When driving a TDI quickly aiming for max power is not the quickest & lets be frank about this that form of driving does not show the TDI in its best light whereas driving in gear i.e. riding the torque does.

The other thing who unless on a race track would be driving their cars with EVERY gear change up to 4500rpm... its crazy and really its admitting you are lacking power. If the vRS isnt quick enough for you then buy a faster car that way you could drive with the revs at 50-70% of what you do here.

Hey here's a thought buy a 335D M Sport and use the slush box to hold the revs to take it to the red line in every gear change - no more relaxed driving instead v Loud engine noise and high fuel usage ROFL again

power is derived from torque

But Torque and Power are directly linked

i.e.

BPH = [Torque/5252]*RPM

or

Torque = [5252*BHP]/RPM

I'm glad to see there's agreement

I think Other person is thinking that in the ideal world you would run an engine at max power and then have a constantly varying gearbox.

That certainly would be the "Best" method however round a track using that method vs a CVT holding it at max torque which would be quicker and you cannot ignore the fact that the max power method would be more fuel inefficient and thesefore over race distance the additional fuel stop may result in less distance completed over the 6 hour race.

So on your point 1 you are stating that youd ideally want to change up hitting max power i.e. 4000rpm however any rpm above this power is falling your rate of change of acceleration is decreasing whereas if you had changed up sooner your rate of change of acceleration would be increasing

But if you changed down at your peak power output and dropped to 3500rpm, the power delievered will be lower anyway...so your accelaration would decrease.

Like I said (several times), the rate of change of power isn't important.

It's the absolute power being delivered.

Frankly though, I'm not really @rsed about what really is rather an academic debate...drive it like you want to, if you believe your way is more efficient then .

Rob.

I think Other person is thinking that in the ideal world you would run an engine at max power and then have a constantly varying gearbox.

That certainly would be the "Best" method however round a track using that method vs a CVT holding it at max torque which would be quicker and you cannot ignore the fact that the max power method would be more fuel inefficient and thesefore over race distance the additional fuel stop may result in less distance completed over the 6 hour race.

I wonder how the Le Mans Audi drivers drive their cars :rubchin:

My Merc varies its shift point based on how it is being driven. Drive it gently and it wafts along shifting up at peak torque, drive it like you stole it and it shifts at peak power.

But if you changed down at your peak power output and dropped to 3500rpm, the power delievered will be lower anyway...so your accelaration would decrease.

Like I said (several times), the rate of change of power isn't important.

It's the absolute power being delivered.

Frankly though, I'm not really @rsed about what really is rather an academic debate...drive it like you want to, if you believe your way is more efficient then .

Rob.

One of the main reasons why a Diesel lasts far longer than petrol is that its fuel is a lubricant the other is that its average revs are far lower and as such take longer to wear out. If anybody drives their car to the red line on every gear change then I really hope you have let it get to the correct operating temp its fully services all fluids are at the correct level and then you let it cool for a few mins otherwise the oil will bake in the Turbo.

On a different note Ford ran one of their Focus ST's engine's on a test bed with gear box (clearly hardly any resistance) but they ran it up to the red line. It was sercived as per the intervals and they ran it like this day & night for nearly 200,000 miles.

One of the main reasons why a Diesel lasts far longer than petrol is that its fuel is a lubricant the other is that its average revs are far lower and as such take longer to wear out.

One of the other reasons is that they are built for strength rather than lightness due to the way that they "ignite" their fuel by pressure rather than by spark.

I wonder how the Le Mans Audi drivers drive their cars :rubchin:

I read A McNish's pre race article in Autocar last year and he said one scary thing about the car is going down the straight its earily silent vs petrol also until he was in 3rd gear he couldnt give it the beans as the torque was too much + it didnt rev beyond 5,000rpm however the change up point in racing condtions was well below peak power.

Usable rev range was 3000 - 5000.

So based upon that if a highly tuned racing diesel engine runs at those revs in the super smooth V12 formation why do you think the relatively harsh 4 cylinder should be used over 2000-4000rpm? And note the 3000-5000 was for racing your using this car on the main road are you :ukliam: :bonk: :pillepall

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One of the other reasons is that they are built for strength rather than lightness due to the way that they "ignite" their fuel by pressure rather than by spark.

This is also true.

And note the 3000-5000 was for racing your using this car on the main road are you :ukliam: :bonk: :pillepall

I don't own any diesel cars

why do you think the relatively harsh 4 cylinder should be used over 2000-4000rpm...your using this car on the main road are you

Probably worth pointing out I don't drive a "relatively harsh 4 cylinder" diesel...

Rob.

So based upon that if a highly tuned racing diesel engine runs at those revs in the super smooth V12 formation why do you think the relatively harsh 4 cylinder should be used over 2000-4000rpm? And note the 3000-5000 was for racing your using this car on the main road are you :ukliam: :bonk: :pillepall

Gearing? :P

Chris

your using this car on the main road are you :ukliam: :bonk: :pillepall

Yes.

HTH

If you're changing at below peak power you are not using the maximum available performance. Simple as that.

The torque just gives you a hard shove & makes you feel like you're going fast.

If you're changing at below peak power you are not using the maximum available performance. Simple as that.

The torque just gives you a hard shove & makes you feel like you're going fast.

But surely on a day to day and gear change to gear change basis you do not need to use all the power available?

Depends on the route, the conditions and the traffic.

For example, my daily commute takes me cross country from t'other side of Chesterfield to Knutsford over the Cat and Fiddle. I do a few cut throughs on B roads. I sometimes need to overtake slower moving traffic (ie most other vehicles )

Best time so far? Not telling, but I only got 16.3mpg for the trip

try listening to this when driving the catt'n'fiddle jon, see if it improves your fuel economy...... lol...

YouTube - MACC LADS - NO SHEEP 'TIL BUXTON

edit... just putting this in for 'funnys' sake......

YouTube - MACC LADS - Monkees

Nah, Prodigy - Diesel Power or Smack your bitch up