Brake Pressure Sensor

[Ross_328i_sport]

Evening,

I am looking to add a brake pressure sensor onto the C400 and connect this to the Vbox system for comparison against tutors laps to understand where improvement can be made.

Does anybody have a good reliable system that works with the Vbox and what sensor have you used?

Thanks

[BertBert]

One of the weaknesses I've found of the Vbox world is the lack of suitable analogue sensors available and the help from the guys on finding them. I've had a go at Aim temp and oil pressure sensors. The temp sensors are hopeless and need Op Amps to get a sensible voltage change. The OP sensor was better with a reasonable voltage change to measure. So maybe look at Aim brake pressure sensors?

What about this?
http://www.aim-sportline.com/download/doc/eng/sens...

Output 1V-5V.

The problem is there is no data to calibrate absolute pressure. But if you are looking for comparisons of brake pressure, perhaps that's not an issue?

HTH
Bert

[David Rowe]

Hi, we have done exactly this on our r300 race cars for a few years now. Drop me an email at [e-mail] and I'll send over the details.

Cheers
David

[poppopbangbang]

Assuming the Vbox has analogue inputs for 0-5V sensors then any 0-160bar or similar pressure sensor with a linear scale will work quite happily.

Most Variohm and P&G sensors will scale from 0.5V - 4.5V so worth checking there is some way to calibrate the sensor within the Vbox.

[DCL]

poppopbangbang said:

Assuming the Vbox has analogue inputs for 0-5V sensors then any 0-160bar or similar pressure sensor with a linear scale will work quite happily.

Most Variohm and P&G sensors will scale from 0.5V - 4.5V so worth checking there is some way to calibrate the sensor within the Vbox.

Vbox can deal with offsets and add formulas in a maths channel if you need to. I've seen solid state sensors work well in the brake line. Even just logging the brake switch is useful. My only word of warning is that the video graphics are delayed in the video processing (IIRC up to about 5 frames) so are best not used for serious analysis. Best to log and view on a graph.

Edited by DCL on Friday 15th January 00:16

[BertBert]

So has anyone found a temp sensor that works with the vbox?

[David Rowe]

I haven't with a temp sensor yet but the principal is exactly the same, variohm may do a good solid state temp sensor 0-5v. Or I would just use a stack st991 as works well. Stack should also have the calibration.

http://www.stackltd.com/accessoriesandspares.html

Again need to plumb the sensor +5v, gnd and signal through via a micro input module.

Can interface may be the answer however if the ECU is compatible in order to log engine temps easily.

[BertBert]

Thanks David,

looks like the Variohm one might be ok (if I can find out that it is linear). The Stack one is M6 and I'd rather use M10 to save using a converter. Do you know who sells them?

Cheers
Bert

[David Rowe]

Whenever we have bought the stack st991 temp sensors we have used demon tweeks, there are also m10 adaptors for them which work ok. From experience these sensors are accurate and rarely fail if looked after.

[BertBert]

Thanks, I'll go down that route then.
Bert

[Ross_328i_sport]

Thank you David for the advice it has been greatly appreciated going further than was required to help. Thanks must also go to DPR Motorsport for providing the equipment in a quick and efficient way.

Thanks