15 Mar - Rolling Road Session

Folks,

Onno has done us proud having a wee dig about to sort out a RR session. A number of you have asked over the past wee while if we were going to organise one. The BMWCC committee are up for supporting it in our events this year and Shorty's having a wee swatch at 'the book' to see where to squeeze it in.

The plan is to go to Hypertech in Bonnybridge who will do sessions on a Sunday for £40 per car. You get 3 power runs with the owner in the car for a full explanation of what is happening. Spectators can watch performance on 40" TV screen. Also includes tea / coffee / biscuits.

Onno reckons there's nice friendly service and the owner will take time out to talk to you about any improvements which can be made and explain should there be any problems with the car.

The owner also can arrange for a hot roll caravan to be on site between 9 and 12 should we want anything to eat.

We need 10 cars or more to do this. So if you're interested then please get £40 to a committee member to confirm your place. We need the funds in hand to pay a deposit and firm up the date with Hypertech. If the event were not to get the numbers required then the £40 will be fully refunded.

Cheers,

Duncan

Sign up :

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Edited by nero

No date in mind yet - Shorty will come up with one *ahem* shortly. Will be checking out autos and modern M cars feasability on the RR

Will bring "The Book" on Sunday for a "chin wag " to see what  Date 's we have to hand

Edited by shorty

Why would ther be an issue with modern M cars?  Is there too much bhp produced?  Might be just worth checking bhp and torque limits on RR.

Ah, hmm, 4th gear I suppose is 99 times out of 100 a direct drive thru the gearbox.  It certainly is on Beamers.  The only gear reduction would then be the differential.  I suppose this would eliminate drag in the gearbox making for a more accurate reading of engine bhp.

Potentially two cars for me - both tiptronicy, one 4x4...

Webdunk wrote: With M cars my understanding is that it is the level of electronics in the car itself which causes the issue. Fundamentall, the front wheels not moving causes the car's brain to get very upset when the rear wheels are doing many MPH...

This may also be true on automatics....bummer 

On E39 and E60 the front wheel sensors provide the information to the ECU for front wheel rotation speed.  This is used as inputs for ASC, ABS and the automatic transmission.  The input from the front sensors is used to determine the gearshift points.  Having as you say the rear wheels doing loads of rpms and the front wheels doing nowt could potentially upset the car big style.

Another thought.  When the traction control kicks in it is measuring the difference in wheel rotation speed.  When the difference between front and rear wheels is sufficient it then thinks that the rear wheels are spinning, cuts the gas and applies the rear brakes.  Now this 'control' won't happen when the traction control is off.  This would allow the rear wheels to spin (on a rolling road?) with the front wheels not moving at all.  But then saying that, when doing a wheelspin with the traction off it's not like the rear wheels are doing 70 mph which I imagine will be needed on a rolling road.

Hmmmm.

Webdunk wrote: Fundamentally RR days are a PITA for RR owners so if they choose to limit participants by number or complexity of generating an honest run then fair play to them.

No problem with that Duncan, the RR owner calls the shots and I'll go along with that.  Hence all the questions before forking out 40 notes.

I've always been interested in finding out what my cars can produce in terms of bhp so I guess I'm jumping at the opportunity.

Keep us posted.

Andrew

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Interested pending Technical discussion :

Fluffy - E39 Alpina
Fluffy - Tiptronic Legnum
Andrew R - E60 545i SE Steptronic

If my can't go on the RR without upsetting the car, I'll still come as a spectator if that's o.k?  Would be interesting to see Stevie's M5 in full flight on the RR.

Andrew