C32 AMG on a Runway.

[marty359]

Well ive wanted to take the car on a runway for a long time and last weekend I did Im amazed at how well it will pull all the way to 150mph then change into 5th and after a remap and delimit the day before managed to get to 160mph at 7.2mpg before running out of road.No timed runs with a passenger but i managed a 13.2 quarter mile with a little rolling start.

There was a nice line up of cars on the day including a GT2,Supercharged E-Type,Holdens galore and nice VXR8's.The GT2 was breathtakingly fast off the line and a VXR8 managed 193mph.I sat in the supercharged E-type which was capable of 165mph and its a bit of a squeeze getting out of it when your 6ft 2"


Anyway i like my vids so heres another one.......complete with commentary from my mate first officer Reid

Viddyou.com: Woodbridge Runway

 

[trapperjohn]

Watched them all Marty. Loved them. Especailly the "chuckle" at the end of your most recent one. Sounded like a grand day out. Thank you for posting them.

 

[Mark300SL]

Nice vid Marty - I always like to see a decent day out at an airfield be it a Woodbridge style brute force day or an airfield trackday like Brunters or Elvington

C32 looked and sounded good and I bet it surprised a few that were not in the know!

 

[Bobby Dazzler]

Well done - told you you'd make it!!

 

[JonMad]

Excellent. Very impressed with the 1/4 mile time and top speed. What power is your car running, do you think, and how much does it weigh?

Is it me or in the first vid did you go flying past the chequered flag and not brake until the last possible point at a brake board? Was that the idea or were you supposed to slow down after the chequered flag? (It might not have been chequered flag at all - was a bit of a blur!)

 

[Gridlock]

Where did you go to get it delimited, and what did it cost?

I don't want a remap or anything, just for it to be able to run to VMAX.

And who organises airfield days?

Cheers

 

[Bobby Dazzler]

I don't want a remap or anything, just for it to be able to run to VMAX.

You'll find that the cost of the de-limit will be the same as re-map and de-limit.

Remember you'll need a very long straight to exceed the limiter, and the limiter is in realitly set slightly higher than 155 mph road speed, which would be even higher as displayed on the speedo.

You may find that some runway/VMax days won't actually have quite enough room to hit the limiter, unless you have mods.

PS Don't forget your tyre ratings need to be appropriate for your top speed too, to be safe.

 

[Gridlock]

Depends what speed you join the runway at - and don't underestimate the in-gear on the C43, I've been surprised (where legal) just how fast it gets to the top of 4th (145mph)..

What does the C32 go on to? C43 tops out at 186, from memory, although I suspect that's at Nardo and nowhere else.

Tyres are rated for 190mph, didn't make that mistake.

 

[Adam230K]

Depends what speed you join the runway at - and don't underestimate the in-gear on the C43, I've been surprised (where legal) just how fast it gets to the top of 4th (145mph)..

What does the C32 go on to? C43 tops out at 186, from memory, although I suspect that's at Nardo and nowhere else.

Tyres are rated for 190mph, didn't make that mistake.

I'm not sure if a 300bhp 4.3 V8 can top out at 186, i might be wrong though. I've seen screenshots of a W202 doing 300ish km/h but i'm so sure that must've been the W202 C55.

P.S. Thanks for the Vid!

 

[marty359]

Excellent. Very impressed with the 1/4 mile time and top speed. What power is your car running, do you think, and how much does it weigh?

Is it me or in the first vid did you go flying past the chequered flag and not brake until the last possible point at a brake board? Was that the idea or were you supposed to slow down after the chequered flag? (It might not have been chequered flag at all - was a bit of a blur!)

I had the car remaped at the same time as having the limiter removed,figures given were

Standard and Modified
Engine Size 3199 3199
Power (BHP) 354 374
Power (kW) 260 275
Torque 332 ft/lb (450 Nm) 358 ft/lb (485 Nm)

It definatly feels a bit friskier.I think it weighs roughly 1600kg off the top of my head plus 2 bags of whickes sharp sand in the tyre well


In the video i left the braking as late as i possibly could going way past the chequered flag and first brake board to go as fast as i could,you can hear my friend getting worried


Gridlock. I only really wanted the limiter removed but all the places i spoke to said it was the same price as a remap, i had it done buy a nice chap called Simon from CCCTech for £295
Ive been keeping an eye on the VMAX section on the Piston Heads site,im waiting for a 2 mile run at Bruntingthorpe where you can enter the start of the runway at speed.

 

[GrahamC230K]

Glad you had fun, knew you would. As you know you'll get a better run at Brunters.

 

[Bobby Dazzler]

Depends what speed you join the runway at - and don't underestimate the in-gear on the C43, I've been surprised (where legal) just how fast it gets to the top of 4th (145mph)..

What does the C32 go on to? C43 tops out at 186, from memory, although I suspect that's at Nardo and nowhere else.

Tyres are rated for 190mph, didn't make that mistake.

I'm not underestimating the C43 - it's powerful and torquey motor in a compact car.

With these VMax runs it's not really about what the top speed your car can do, it's how much speed you can build up before you run out of runway!!

Very high speed runs are all about power and aerodynamics, and so progress will be blunted dramatically as speeds rise.

Each speed increment takes progressively longer to pass, and the ground is covered incredibley quickly and so without a banked oval you need a very long straight to reach the true top speed.

 

[Bobby Dazzler]

What does the C32 go on to? C43 tops out at 186, from memory, although I suspect that's at Nardo and nowhere else.

Never done it, so can't be sure. I can have a guess though in the absence of anything better to go on...

Calculated theoretical top speed for C43 AMG is 169 mph
Struggled to find all data from one reliable source, so used C36 track/height
transmission losses 18%
engine power (at the flywheel) 306 BHP
engine power (at the wheels) 251 BHP
vehicle track 1.497 m
vehicle height 1.412 m
maximum vehicle cross section 1.90 m*m
vehicle mass (weight) (kg) 1569 kg
drag coefficient 0.32

Calculated theoretical top speed for C32 AMG is 187 mph
Data taken from Autocar Road Test
transmission losses 18%
engine power (at the flywheel) 349 BHP
engine power (at the wheels) 286 BHP
vehicle track 1.493 m
vehicle height 1.475 m
maximum vehicle cross section 1.98 m*m
vehicle mass (weight) (kg) 1560 kg
drag coefficient 0.26

I'm happy to have a similar 'guess' for any car if you can provide the information above - whether standard or modified.

The cross section is very difficult to find though, so I can approximate that from the track and height. Also only need power at the flywheel or wheels - no need for both.

 

[Gridlock]

Hmm, my curiosity is piqued now

Vmax High Top Speed Mercedes C43 AMG 300 km/h - Need4speed.ws

That's a C43 doing 300km/h (186) - I guess a 5% margin of error at that speed is probably pessimistic but still gives a range of 175+?

I really shouldn't be interested in this, it won't end well

Bruntingthorope sounds good - will meander over to PH and take a look.

 

[Bobby Dazzler]

Hmm, my curiosity is piqued now

Vmax High Top Speed Mercedes C43 AMG 300 km/h - Need4speed.ws

That's a C43 doing 300km/h (186) - I guess a 5% margin of error at that speed is probably pessimistic but still gives a range of 175+?

I really shouldn't be interested in this, it won't end well

Bruntingthorope sounds good - will meander over to PH and take a look.

I'm not suggesting it's not possible to go faster. Of course modifications to increase power, changing the final drive ratio, changing gearing with different wheels could all increase the top speed.

As you say speedos are often optimistic, and so what the driver sees will be higher than the true road speed, so 10% on top of 169 mph would be 186 mph on the speedo.

If you do take a look at PH, check out the results to one of the VMax events, and have a look at which types of car break speed thresholds.

A true 180 mph is 500bhp plus territory: 996tt, SL55 AMG, Vanquish, E60 M5, etc.

A true 160 mph is 300-400bhp territory: M3 CSL, Z3M, E39 M5, etc.

Hence the reason I say unless the limiter hits at exactly 155mph which isn't always the case, then you may not need to remove the limiter to reach your maximum speed on the runway, unless it's a really big 'un!!

Remember some cars won't actually reach their true VMax - just not enough space to achieve it - it's really VMax given over a particular distance.

 

[Mark300SL]

The problem with the CRX is that we reach Vmax roughly by the 1/2 mile distance or just past it

It is good for about 155/160 flat out depending on rev limit - but gets to 120 before the 1/4 mile marker, so we find ourselves knocking on the limiter a long long way short of the flag/cones


Mark

 

[GrahamC230K]

My best at Brunters is a true 167mph (limited by distance), that's with about 330-340BHP and ~400NM torque.

You should better that in the C32 I'd hope.

 

[Sp!ke]

Looks very relaxed and stable at speed.

Surprised you didnt use all the runway... We use absolutely everything we can doing the straighlining stuff on bikes at woodbridge.

We started on the rough stuff a few hundred yeards behind you, so by we are already doing around the 100mph mark by the time we get onto the tarmac at the start of the runway. It makes for a pretty bumpy launch but gives you that extra time on full gas in top.

 

[Sp!ke]

The problem with the CRX is that we reach Vmax roughly by the 1/2 mile distance or just past it

It is good for about 155/160 flat out depending on rev limit - but gets to 120 before the 1/4 mile marker, so we find ourselves knocking on the limiter a long long way short of the flag/cones


Mark

You need to look at your gearing then no?

 

[JonMad]

I had the car remaped at the same time as having the limiter removed,figures given were

Standard and Modified
Engine Size 3199 3199
Power (BHP) 354 374
Power (kW) 260 275
Torque 332 ft/lb (450 Nm) 358 ft/lb (485 Nm)

It definatly feels a bit friskier.I think it weighs roughly 1600kg off the top of my head plus 2 bags of whickes sharp sand in the tyre well


In the video i left the braking as late as i possibly could going way past the chequered flag and first brake board to go as fast as i could,you can hear my friend getting worried

Thanks, that's impressive. I reckon on 100 in 12.7 and just under 13.5 standing quarter in mine, which I guess weighs about the same, but haven't done that officially yet.

I did my first ever car control learning at Brunters. I only hit 148 in my BMW 540, with a gear to go. Needed to round that bottom corner a bit faster!