Page 1 of 2

VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Jun 16, 2015 7:53 am
by sass
Hondata
Have you ever had the problem when speed sensor turns off after car reaches 250km/h? ( 155 mph)

Image

My speed sensor 78410-S5T-901
What could be a solution changing to some alternative more reliable sensor?
Thank

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Jun 16, 2015 9:37 am
by Hondata
The speed sensor will only read to 255 kph (internal limitation of the ECU), but it should not switch back to 0.

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Jun 16, 2015 11:01 am
by sass
I understand.

What might be an idea?

Image

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Jun 16, 2015 2:19 pm
by Hondata
What sort of speed sensor is it? The final drive or 3rd gear?

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Jun 16, 2015 10:23 pm
by sass
My speed sensor 78410-S5T-901
Image
My gear NPR3
1
3.226
2
2.130
3
1.517
4
1.212
5
0.972
6
0.780
final drive
4.105
Image

Speedometer Drive
41312-PE6-310
Honda CTR JDM 4.764


–°ar used in races on the mile
https://www.facebook.com/revSpeed.eu

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Wed Jun 17, 2015 6:09 am
by Hondata
The next step is to try another speed sensor.

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Sun Aug 21, 2016 4:48 am
by sass
Hondata wrote:The next step is to try another speed sensor.
Hello hondata,

still have the same problem with speed sensor: i have changed 2 sensors but still do not work propeply.

2015
Speedometer correction 12%
1 race
Image

2 race
Image

2016
http://www.onemile.ee/?lang=en&page=res ... 2016&acm=1
New gear
Speedometer correction 9%
1 race
Image

2 race
Image

https://www.facebook.com/OneMileChallenge/

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Mon Aug 22, 2016 12:59 pm
by Hondata
We've run multiple vehicles over 255 kph and the speed usually pegs at 255 kph. I would consider raising the front off the ground and running it in top gear to see if the problem is load or speed dependent.

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Aug 23, 2016 1:19 am
by sass
I would consider raising the front off the ground and running it in top gear to see if the problem is load or speed dependent.
can you explain?
Thank

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Aug 23, 2016 9:16 am
by Hondata
Pick a place where the neighbors will not complain. If you are 4WD then you'll need to disconnect the rear driveshaft. Jack up the front of the car and support the lower arms so that the axles are straight (to keep the CVs happy). Put in top gear and run then engine to 260 kph. If you're close to redline at that speed then I'd be a little careful as the engine is less happy at high rpm under light load than full load.

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Aug 23, 2016 12:20 pm
by sass
Sorry.
I am not crazy.
I will think about it on the dyno.

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Thu Sep 01, 2016 12:31 pm
by sass
Hondata
I'm sorry for the delay
I have no answers

I know that this is not a problem speed sensor. What frequency (kHz) you are using for the speed readings?
Image

Image

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Thu Sep 01, 2016 1:01 pm
by Spunkster
Post your calibration as well

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Thu Sep 01, 2016 1:27 pm
by sass
ok
The speed sensor will only read to 255 kph (internal limitation of the ECU), but it should not switch back to 0.
it looks weird
https://www.youtube.com/watch?v=bjVjWMT ... e=youtu.be

Re: VSS 155 mph Off= N2O, VTS,RVS,BC Duty

Posted: Tue Sep 13, 2016 12:37 am
by sass
Hondata
how it's going with that issue