VSS drops 10-40 mph during pass..

s300 and SManager software questions & answers
Post Reply
mo_spec
Posts: 31
Joined: Sun Oct 14, 2007 5:07 pm

VSS drops 10-40 mph during pass..

Post by mo_spec »

So as of the end of last season we have been noticing the VSS signal has been sporadic. The car is on s300 and we use the pwm boost by gear. So when the vss signal drops say 30 mph that will put the PWM % at a lower % because its sampling from the next gear down. Timing and boost are affected as well as any gear comps I have set up.

Here is the set up:

92 civic
S300 v1 in a p28
built sleeved gsr
liberty trans
24.5 tire
850-900 hp


Any one seen this before? any suggestions?
Attachments
nayr_one mod 11_27_11.skl
(34.05 KiB) Downloaded 123 times
lvsw 2.s3d
(293.6 KiB) Downloaded 117 times
Last edited by mo_spec on Fri Mar 23, 2012 1:23 pm, edited 1 time in total.
PFC hatch 9.04@163 "True Street" trim
User avatar
Spunkster
Site Admin
Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: VSS drops 10-40 mph during pass..

Post by Spunkster »

Please don't just post screen shots as it makes it very dificult to help with any issues. Please follow the posting instructions at http://www.hondata.com/forum/viewtopic.php?f=19&t=3772
mo_spec
Posts: 31
Joined: Sun Oct 14, 2007 5:07 pm

Re: VSS drops 10-40 mph during pass..

Post by mo_spec »

All fixed sorry about that.
PFC hatch 9.04@163 "True Street" trim
User avatar
Spunkster
Site Admin
Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: VSS drops 10-40 mph during pass..

Post by Spunkster »

This looks like you are getting wheel spin and then the VSS will read lower once you get traction.
mo_spec
Posts: 31
Joined: Sun Oct 14, 2007 5:07 pm

Re: VSS drops 10-40 mph during pass..

Post by mo_spec »

I don't think it's wheel spin. The car has a respectable short track, especially for a small tire. Also the issue is occurring in 4th gear, and I doubt it's spinning at 160mph

1.50 60ft
4.1 330ft
6.1 @ 124 at the 1/8 mile

Is it possible that there could be electrical interference causing this? I am thinking of making a separate harness for the vss to isolate the signal wire....
PFC hatch 9.04@163 "True Street" trim
mo_spec
Posts: 31
Joined: Sun Oct 14, 2007 5:07 pm

Re: VSS drops 10-40 mph during pass..

Post by mo_spec »

Bump.. I feel like some one else has had to have run into this before...
PFC hatch 9.04@163 "True Street" trim
hondatechpr
Posts: 27
Joined: Thu Feb 28, 2008 6:54 am
Location: Guayama P.R.
Contact:

Re: VSS drops 10-40 mph during pass..

Post by hondatechpr »

Check the speed sensor or the plug, sometimes get loose on the pins
Post Reply