How to drive a 3R

[timb551]

Hi

May be a silly question but let me finish

My mate has just got his new 3r and he has been driving it for a few weeks now, but he is not sure when to change gear. He asked me to do some investigation into the best revs to change gear.

hope that makes sense.

thanks

Tim

[joust]

Max power is around 6500 - so around there if you are going for "full launch mode".

Otherwise just change gear whenever you want to - the torque in the engine means you can pretty much go from 1st into 3rd at 20mph without any problems.

Or did I missunderstand your question?

J

[pbrett]

joust said:

Max power is around 6500 - so around there if you are going for "full launch mode".

How's the clutch with this sort of thing? Having an EVO6 before (with tons of grip off the line) I'm a bit shy of doing this. You get approx 10 full launches with the standard clutch.

Thanks

Phil

[joust]

No - I meant *change up* at 6500 if you are going for maximum acceleration - don't try sidestepping the clutch at that point!!!!

J

[pbrett]

I did think it was a bit strange! I guess it's more of a 3 - 3.5K revs usual smooth start idea. I'm also guessing the small amount of lag works like traction control (well a bit anyway).

Thanks

Phil

[joust]

Yep - that seems to give good "traction"

J

[DanH]

Surely optimal change up point is when the torque at the wheels is greater in the next gear than it is in your current gear. This doesn't necesarily equal peak power.

Need cascade curves taking into account transmission losses as revs rise and everything else!

Not sure I'd encourage revving to 6500 much, unless the new exhausts are much improved. The baffles got blown out if you did it too much in the old version. Its been changed but I've not looked into whether its much better.

[joust]

DanH said:

Surely optimal change up point is when the torque at the wheels is greater in the next gear than it is in your current gear. This doesn't necesarily equal peak power.

Of course power and torque are related so that's a moot point becuase you are looking for the optimum *force* point....

DanH said:

Need cascade curves taking into account transmission losses as revs rise and everything else!

Yes, but of course you are looking for the optinmum *force* point, which is a combination of torque and gearing

Look at http://vista.pca.org/jsr/jsrpca/ElecShoreline.html for an example on a porsche - spooky how the shift point for the 996 is always at 7200 regardless of gear!

DanH said:

Not sure I'd encourage revving to 6500 much, unless the new exhausts are much improved. The baffles got blown out if you did it too much in the old version. Its been changed but I've not looked into whether its much better.

New ones are fine - I've not had a problem with mine despite serious reving by the one and only Mr Hucknall

J

[m12_nathan]

Exhaust number 5 is dead on mine

This one lasted all of 4 hours. As my car comes out of warranty soon the factory have kindly said I can have the next replacement exhaust off the car to keep for incase I ever want to sell it.

My car is loud

[DanH]

Ok so you are agreeing with me now Justin? Because optimum torque and optimum power aren't the same (and you said the latter originally). I agree it involves gearing which is why I said torque at the wheels...

As to the Porsche, I'm sure they have the money to pick the ratios perfectly