Jump to content

Photo

Throttle Position Sensor - '99 - Traqmate

- - - - -

  • Please log in to reply
8 replies to this topic

#1
Muda

Muda

    ComingToAMirrorNearYou

  • SMembers
  • PipPipPip
  • 365 posts
  • Location:East
  • Region:WDC
  • Car Year:1999
The throttle position sensor on my '99 isn't giving me accurate data on my Traqmate. At rest everything seems fine but it is producing graduated lines when used on track, as if the voltage is slowly rising and receding. I have included a 1000 ohm resistor in line with the signal wire as recommended in an older thread. Should I remove the resistor or is there some other problem? Traqmate setup is straight forward, .16v = 0, 3.4v =100. This is the range I get, engine off. Here's a pic of the graph:

Posted Image
Make it Rain - Made Paypal donation of $100+ Bona fide - A bonafide Spec Miata driver

#2
Duncan

Duncan

    Member

  • Members
  • PipPipPip
  • 251 posts
On my 99 removing the resister put the car into limp mode. I have the same variation as you with my stock TPS into my AIM system. I've just learned to live with the noise. Since there is no variation with the car not running I suspect the variation is from the alternator output voltage changing.

Duncan
Series Champ - Won a points based series in a Spec Miata Bona fide - A bonafide Spec Miata driver We have a Winnah! - Won their 1st race... Congratulations!

#3
Chris Price

Chris Price

    Member

  • Members
  • PipPipPip
  • 35 posts
  • Location:Bloomfield Hills, MI
  • Region:Great Lakes
  • Car Year:1999
  • Car Number:3
I don't have a Traqmate so this is a bit of a guess, but have you checked that the software isn't applying a smoothing filter / rate of change filter to this input/variable?

1999 Spec Miata: East Street born and V2 Motorsports raised
2010 NASA Great Lakes SM Champion
2010 NASA Great Lakes Rookie of the Year

2013 NASA Midwest SM Champion

Series Champ - Won a points based series in a Spec Miata We have a Winnah! - Won their 1st race... Congratulations! Bona fide - A bonafide Spec Miata driver

#4
Muda

Muda

    ComingToAMirrorNearYou

  • SMembers
  • PipPipPip
  • 365 posts
  • Location:East
  • Region:WDC
  • Car Year:1999
Filter was on high. Traqmate is new to me. Looks perfect now with no filter. Thanks for the kick Chris!
Make it Rain - Made Paypal donation of $100+ Bona fide - A bonafide Spec Miata driver

#5
Danny Steyn

Danny Steyn

    Zulu rain warrior

  • SMembers
  • PipPipPipPipPip
  • 2,405 posts
  • Location:Fort Lauderdale
  • Region:FL
  • Car Year:1999
  • Car Number:39
Muda - please would you post a new screen capture without the filter - would like to have something to compare to
thanks

Danny
Danny Steyn Racing | DSR YouTube Channel
Danny Steyn Photography | Adept Studios | Ocean MachineryOPM AutosportsRossini Racing Engines | G-Loc Brakes | 

2018 SCCA Runoffs Champion, NASA Champion, Hoosier Super Tour Champion, June Sprints Winner

2016 June Sprints WInner, ARRC Winner, NASA Eastern States Championships Podium

2015 Eastern Conference Majors Champ, June Sprints Winner, ARRC Winner

2014 NASA Eastern States Championship Runner Up.

2013 SEDiv Driver of the Year, Eastern Conference Majors Champ, SEDiv National Champ, ARRC Winner, Runoffs Podium

2011 SEDiv Driver of the Year, SEDiv National Champ, ARRC Winner, Palm Tree Quad National Champ, SEDiv ECR Champ
2010 June Sprints Winner, ARRC Winner

2009 SARRC Champ, SEDiv ECR Champ, FES Champ
2008 SEDiv ECR Champ

June Sprints winner  - June Sprints winner Series Champ - Won a points based series in a Spec Miata ARRC Champion - Won the ARRC Race in a Spec Miata We have a Winnah! - Won their 1st race... Congratulations! Bona fide - A bonafide Spec Miata driver NASA Champs Winner - NASA Champs Winner June Sprints winner  - June Sprints winner ARRC Champion - Won the ARRC Race in a Spec Miata ARRC Champion - Won the ARRC Race in a Spec Miata Majors Winner - BFG Supertour Winner -

#6
Muda

Muda

    ComingToAMirrorNearYou

  • SMembers
  • PipPipPip
  • 365 posts
  • Location:East
  • Region:WDC
  • Car Year:1999
Velocity - Filter = Low
TPS - Filter = None
Need to raise voltage at 100% a bit to see top of graph.

Posted Image
Make it Rain - Made Paypal donation of $100+ Bona fide - A bonafide Spec Miata driver

#7
Roger Caddell

Roger Caddell

    Member

  • Members
  • PipPipPip
  • 120 posts
  • Location:Graham, WA
The downside/risk of over filtering. I always like to look at data without any filtering to start with and then filter if desired. Glad you found the issue!

#8
Cy Peake

Cy Peake

    Member

  • Members
  • PipPipPip
  • 280 posts
  • Location:West Simsbury, CT
  • Region:NER
  • Car Year:1999
  • Car Number:7
Which color wire was tapped and where? No resistor, correct?

-Cy
Supported by LTD Racing

2011 + 2013 NER STU Champion


#9
Muda

Muda

    ComingToAMirrorNearYou

  • SMembers
  • PipPipPip
  • 365 posts
  • Location:East
  • Region:WDC
  • Car Year:1999
TPS is on front of intake manifold, drivers side.
Lt Green/Black stripe.
Add 1,000 ohm resistor, in line.
Connect to analog input on Traqmate.
Turn key on, observe max voltage at full throttle.
Set low voltage at 0, high voltage a couple of 1/10's higher than max voltage observed.
Set scale to PCT
No filter in software.
I use shielded cable for all sensor wiring.

Posted Image
Make it Rain - Made Paypal donation of $100+ Bona fide - A bonafide Spec Miata driver




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users