New R36 cat-back exhaust

**Billcat** · 23-04-2009, 08:07 AM

I was wondering how to keep the lovely burble at idle, while the choke is running going for the rest of the drive. Now we have an answer! How much and can we do a twin turbo setup?

**Autopia** · 23-04-2009, 11:54 AM

Originally Posted by Lance B

That is an "at the wheels" torque figure on the graph, rather than "at the flywheel" figure which is what the VW quoted figure is. Suffice to say that the torque is higher by about 30-40Nm right across the range, so about a 8% increase which is not to be sneezed at.

Sorry but the "at the wheels" power and torque figures are always lower than flywheel readings not higher.
So if the R36 has 350Nm (as stated by VW) at the flywheel then the "at the wheels" measurement should be less due to the transmission and driveline.

It's been explained by the dealer anyway.

**DiMmY** · 23-04-2009, 04:22 PM

Originally Posted by Autopia

Sorry but the "at the wheels" power and torque figures are always lower than flywheel readings not higher.
So if the R36 has 350Nm (as stated by VW) at the flywheel then the "at the wheels" measurement should be less due to the transmission and driveline.

It's been explained by the dealer anyway.

Power will always be lower at the wheels, torque no.

Torque depends on gearing, you could get a torque reading a of over a 1000Nm with the right gearing and diff ratios.

**Wolfman_36** · 23-04-2009, 09:03 PM

Warning - Science content

(1) Power = torque * rotational speed
ie (Watts) = (N.m) x (radians per second)
(2) You can have torque without power (ie stalled electric motor)
(3) transmission efficiency always less than 100%
so you will always lose power progressively thru the drivetrain
from the crankshaft to the wheels
(4) For manual (ie no slip) rotational speed ratios fixed, so
(5) Power losses appear as torque losses, superimposed on (1)

QED if you do the maths on the gear ratios

**gead** · 23-04-2009, 09:05 PM

yeah, but how good does it sound....

**Lance B** · 23-04-2009, 11:38 PM

Originally Posted by Autopia

Sorry but the "at the wheels" power and torque figures are always lower than flywheel readings not higher.
So if the R36 has 350Nm (as stated by VW) at the flywheel then the "at the wheels" measurement should be less due to the transmission and driveline.

It's been explained by the dealer anyway.

NO!!! Power will be lower, but torque is higher due to the multiplying effect.

Here is an example:

http://www.car-videos.net/articles/h...wer_torque.asp

Flywheel Torque in this example above in 1st gear is 154.7ft-lbs and wheel torque is 1,735ft-lbs!!!

Flywheel Torque in this example above in 5th gear is 154.7ft-lbs and wheel torque is 382ft-lbs!

This is why you can get a car moving in 1st gear quicker than in 5th gear due to the multiplying effect of torque.

**dubbed** · 24-04-2009, 11:56 AM

Originally Posted by GT3

We've completed development of our R36 cat-back exhaust - should be ready for release soon. Here's a sneak preview of what it sounds like (goes pretty good with the tune too

). ..more info will be available once all testing is complete.

See the video here

Wow. I think that must be the best sounding V6 I've ever heards. I can't stop listening to it

**Black R36 Sedan 09(alfie)** · 25-04-2009, 11:43 PM

Hey guys i am loving the new cat-back on my R36... The boys down at Evolve-Technik have done a brilliant job.. The new exhaust and tuned ECU definitely gives the car more grunt.. Stock BMW 335i's are given a run for their money.. Next up is H&R height adjustable coil overs and H&R adjustable anti-sway bars.

**Autopia** · 26-04-2009, 10:27 AM

Originally Posted by Black R36 Sedan 09(alfie)

Hey guys i am loving the new cat-back on my R36... The boys down at Evolve-Technik have done a brilliant job.. The new exhaust and tuned ECU definitely gives the car more grunt.. Stock BMW 335i's are given a run for their money.. Next up is H&R height adjustable coil overs and H&R adjustable anti-sway bars.

Thanks for the feedback.

ECU tune, cat-back exhaust, H&R coil overs and sway bars....spend spend spend. Way to go.
Where are you getting the H&R gear from?

**zsolt_downunder** · 26-04-2009, 07:02 PM

Originally Posted by Black R36 Sedan 09(alfie)

Hey guys i am loving the new cat-back on my R36... The boys down at Evolve-Technik have done a brilliant job.. The new exhaust and tuned ECU definitely gives the car more grunt.. Stock BMW 335i's are given a run for their money.. Next up is H&R height adjustable coil overs and H&R adjustable anti-sway bars.

Good luck with the rest of your tuning/modification endeavors and keep us posted.