Dash2 - How To Configure 28,023 Pulses Per Mile

[356speedster]

As the title says, how do I configure the Dash2 to accept 28,023 pulse per mile for the speedo? The dash's internal config stops at 12,000...

.... I did see another (old) thread discussing this and it looked like there was a secret solution, but this wasn't discussed on the forum. Does anyone know what it was?

I'm using the RT hall sender connected directly to the Dash2. My car has 2.067m rolling circumference rear tyres and a 36 tooth trigger wheel fitted to the drieshaft, from which the ECU takes it's speed reading via it's own hall sender..... I've had a nice billet custom bracket made to hold both hall senders together over the trigger wheel and have less than 2 weeks to my IVA test!!!

Can anyone else help me get the dash configured correctly, pls?

[striker]

I think your out by 2 decimal places as it should be cm not meters

1609/206.7 x 36 = 280.23

HTH

[356speedster]

I think your out by 2 decimal places as it should be cm not meters

1609/206.7 x 36 = 280.23

HTH

Hi Striker.... so are you saying the manual is wrong then?? Copy/paste directly from my Dash2 manual states:

"measure on the ground the distance travelled during one complete wheel rotation in metres or inches and use one of the following formulae:

Distance in meters: Pulses per mile = 1609/rolling circumference of wheel"

As such, I have (1609/2.067)*36 = 28,023

I'm now considering cutting 24 teeth out of my trigger wheel to get it down to 12 teeth, which would then give me an in-range calculation of 9,341 (again, assuming the manual is correct at wheel circumference in metres). Granted the ECU would then need to be tweaked too, but seems like the easiest option at this point.

[cguenther]

same problem here, solved with this one:

http://www.zmm-electronic.de/products/en/moduls-for-Speedometer/digital-frequency-converter-speed-changer.html

best regards
carsten

[Turby]

You could try this one http://www.race-technology.com/content. ... &cat=30606

or google for frequency divider. You should be able to build one for "not a lot" or buy one ready made.

[356speedster]

Hi folks, thanks for the replies. After a chat with Race Tech, I decided that rather than adding more "kit" to work around the problem, I've given my trigger wheel some dentistry, courtesy of my friend Mr Dremel!

So now my 36 tooth trigger wheel is down to 12, which allows me to drop down to 9,341 pulses per mile. The car is due an engine re-map this week too, so the ECU will be amended to react to 12 teeth too.

Probably the easiest fit to the problem.... now I just need to get the damn re-flashing process to work!!

[Turby]

I'm intrigued how you fitted the sensor pick up ring to the driveshaft...

[356speedster]

Here's a pic of the original installation......
https://www.facebook.com/photo.php?fbid=435230626527056&set=pb.227986643918123.-2207520000.1369856724.&type=3&theater

The wheel is bolted between the driveshaft and gearbox drive outlet. The sensor on the left is for the Dash2 and the one on the right is for the ECU. Only difference now is the lack of teeth on the wheel, LOL!![/url]