Ceasars Chariot

iTrader: (16)

Im going to have my Greddy Emanage Ultimate installed and tuned real soon. I had a question. I dont know anything about tuning. My vehicle speed sensor is out of whack and I have that code.

For example my rpms and mph is off or doesnt display the acurate mph. 5500 is 6000 for example on rpms.

Is this something I need to fix before having a Greddy Emanage Ultimate tuned? I have only dynoed twice and I dont know if they are able to see what rpms the car is running bypassing, or not looking at my gauge display or reading.

my rev limit hits at 7000 rpms which makes me believe im 500 rpms off. Will this need to be fixed before hand in order to extend rev limiter acurately, set activation point for 00VI switch over, and 2 step launch limiter ?

95BLKMAX

iTrader: (10)

Is the ground for the VSS at the transmission corroded (its towards the driver side from the actual VSS)? I know with that ground off the speedo doesnt work. But no you should not have to mess with that signal at all for the EU (someone correct me if Im wrong).

The RPM signal comes from the CPS' output (if Im not mistaking). Im sure the ECU reads it fine (your car would run like crap, IF it even ran with a bad CPS). So its just a matter of figuring out where the tach gets its signal from (not sure if its split to ECU & gauge at the CPS or if the signal goes into the ECU, THEN up to the speedo on a seperate wire- pretty sure its the 2nd scenario). If not that maybe your gauges are crapped out from all that bouncing off redline

Hoooper

most likely, the problem is with the guage and not the ECU, many people that take an RPM sample from their datalogger see a difference between the datalogger value and what the tach says. since the EU runs off the ECU, youll most likely be fine and the EU will get the right number. however, with the rev limit extended the tach will probly end up even further off at the top, so you might want to check it out anyway, just dont call off the tuning session for it.

nismology

iTrader: (8)

This is how it works....the vehicle speed sensor sends the signal to the gauge cluster which then sends the signal to the ECU. And for the tach the CPS sends the signal to the ECU which then sends the signal to the tach. Since the speedo and tach circuits are completely unrelated, i say the gauge cluster itself is acting up. And no, this won't affect tuning since the EU deals directly with the sensors/wiring.

Hooper: The A32 tachometer is VERY accurate when it's functioning properly.

Ceasars Chariot

iTrader: (16)

okay, right now i keep a piece of black tape even with 7000 rpms to remember its rev limit, lol !

95BLKMAX

iTrader: (10)

:rolf:, please i'd love to see a picture of this!

Hoooper

yeah i knew that, just wanted to give another possibility.