Jump to content
SAU Community

Power FC speed reading adjustment? Is it possible?

NismoR31Jet

By NismoR31Jet,
in Car Audio & Electrical

 Share

Recommended Posts

NismoR31Jet Community Regular

NismoR31Jet

Posted
Posted

Hi all, Ive got an R31 with an RB26 in it with a power FC. Im also running an RB25det gearbox so my speedo is a mile out! at 100 KMH it showing 80 kmh and the stock speedo is never fantastic. I was looking at hooking up the speed signal from the gearbox to the Power FC, and using the speed reading on the hand controller. But, I was wondering can the speed reading be adjusted on the hand controller to be accurate?

I know I can just use a GPS speedo, which I am using my GPS for speed on the car, but id like a better option.

 

Thanks.

GTSBoy Grand Master

GTSBoy

Posted
Posted
1 hour ago, NismoR31Jet said:

Will it work with the PFC? I bought one of those to try and adjust my original speedo and it didn't work. 

I will type this out for the 300000000000668684873276347th time.

The signal from the sensor to the speedo head is a sawtooth (AC) voltage +/-1 volt. The speedo head converts that to a square wave PWM 0-5V signal for the ECU (and every other CU in the car that looks at speed). You have to set the Jaycar jobby up for the type of signal you are correcting, and you can't ever try to direct connect the sensor to the ECU, because they just don't speak the same language.

The Jaycar one, I think, works well on AC signals and not on PWM signals. If you have a need to convert a PWM, the smart approach these days would be to program an arduino to take in, modify and spit back out. Would only take a few dozen lines of code and possibly a variable resistor to allow you to adjust the effect without reprogramming.

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • TurboTapin
      boost source Size Garrett gt28 gen2

      By TurboTapin · Posted

      You just need to remove the compressor housing, not the entire turbo. I would not be drilling and tapping anything with the housing still on anyways. 
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      So, I put my boat on a boat. First of all, I'm going to come out and say it. Why is Tasmania not considered a holy goal, an apex that all road-legal modified cars go to, to experience? This place is an absolute wonderland of titanic proportions. If people are already getting club runs for once in a lifetime 30 person cruises to Tassy then I've never seemed to see it. It is like someone replaced the entire place with an idyllic wonderland for cars, and all of the people living there with paid actors who are kind, humble, and friendly. Dear god. After doing a lap of almost all of the place I've found that it's a great way to find out all of the little things that the car isn't doing quite right and a great way to figure it all out. All in all, I drove for 4 hours a day for a week and nothing broke. I didn't even need to open the engine bay. This is by all means a great success, but it has left me with a list of things to potentially address. I also now have a 3D printed wheel fitment tool which annoyingly hasn't got any threads in it to actually assemble it. I might be able to tape it together to check the sizing I actually want to use, but it'll likely involving pulling the shocks out to properly measure travel at least at the front, and probably raise the car while I'm at it, at least in the rear. I scraped on quite a few things and I'm not sure how else to go about it. I was taking anything with a bump at what felt like 89 degree angles. And address those 10 other tasks. And wash the car. God damn it is dirty. And somehow, the weather was perfect the entire time - And because I was on the top of Mt Wellington it turns out it was very much about to freeze up there. I did something I typically never do and took some photos up there in what must have been -10 and the foggy felt like suspended ice, rather than mere fog. If you own a car in Australia, you owe it to yourself to do it.
    • QB6SAGR
      Battle of the broken skylines

      By QB6SAGR · Posted

      Damn that was hilarious, and a bit embarrassing for skylines in general 😂 vintage car life ey. That R33 really stomped. Pretty entertaining stuff
    • cosline
      R32 gtr transmission strength, billet plate

      By cosline · Posted

      Hi, I have a r32 gtr transmission. Does any of you guys have an idea how much power it will hold with the billet center plate and stock gearset? At what power level and use did yours brake with or without billet plate? Thanks, Oystein Lovik
    • Rezz
      Spotted on the street....

      By Rezz · Posted

      Saw this replica police car based on a Mitsubishi Starion XX parked next to a 'police box' (it's literally a box) in Hirohata, Himeji City in Hyogo prefecture the other day. It's owned by Morii-san who is a local Mitsubishi Starion enthusiast. According to a local radio station blog post, he always wanted to make a police car himself based on ones he saw in his favourite Manga comics.  As it's illegal to modify a car to look like a police car and drive on the road, Morii-san tried many times to get permission from Aboshi police station headquarters nearby. They refused initially by after they got tired of that they granted him permission. However, the car can only be displayed on private property and obviously can't be registered as long as the police livery is present. The car was completed at a cost of 1.5 million yen (US$ 10,000) in addition to the car cost. A location was chosen outside Hirohata Police box where the car can easily been seen from the street. Morii-san has two other Starion road cars, both widebody GSR-VRs.
×
×
  • Create New...