Another Pace427 heading to Vic

[Paintwerks]

Andrew, I purchased some 'Remflex' 3000 degree Fahrenheit gasket sheet from Eagle Auto Spares in Dandenong. $85 for 6" x 24".

Cut them out with a scalpel and utility knife. Just be super careful not to bend the material as it will break.

[Zarf]

Hi Guy
Have you checked into wether both signals are digital or one digital & the other analog if so a convertor may be required i think they are called ratio boxes..
regards Andrew

[Gav]

You may find that the speedo is wired back to front, try changing the polarity.
The factory wiring and the wiring to my trans controller are opposite to one another, it's worth a go.

[MikeFromPerth]

i know nothing and am totally guessing here, but maybe it said "no signal" because there was indeed no pulses being sent from the VSS, on account of the fact that the vehicle was stationary at the time? i.e. do you need to press the calibration button when it's moving?

[guye]

Zara, Gav. I have already tried both wires. Only thing I've yet to try though is the 'negative' wire with a pill-up voltage. I'm going to try that tomorrow night.

Mike - how silly do you think I look ? But to be clear, yes, you pick a speed (I tried 40kmh and a few others to be sure), use your gps or the obd2 scanner to measure 40kmh (while your driving), then press the 'speed matched' button, and it is supposed to then read the signal and lock it in, but obviously it fails.

[MikeFromPerth]

Originally Posted by guye

Mike - how silly do you think I look ?

not as silly as i look! haha. i had no idea about the 'speed matched' thing. live and learn! sorry i couldn't help.

[guye]

All good Mike!

So did more research tonight, and universally the word is that either wire from the vss sensor on the tremec should be fine to use, and then the other wire from the sensor should be grounded. I haven't expressly done that, because both wires are hooked into the ECU. Do you think I'll damage anything if I try that though? I can't easily disconnect the ECU front the vss, even temporarily. I'd need a second plug or I'd need to cut both wires, which I'm loathe to do - yet.

Any thoughts? To be clear, I'm suggesting a run one vss wire to the gauge, ground the other wire, and leave both ALSO connected to the ECU.

[gjkrv8]

Guy, I reckon you are close.

According to the diagram on the LS1 ECU one of the signals is grounded inside the ECU anyway. (assuming your later model ECU does the same thing)

I wonder if you have the wrong wire? I assume you have tried either wire?

[Gav]

When I was sorting mine, I disconnected the ECU.
I then worked out how to get the signal to the new appliance to work and then got them working together.
I also had all sorts of issues with getting my speedo to work.
After spending countless hours I worked out it was rooted and got another one which worked straight away.

[spookypt]

Originally Posted by Gav

After spending countless hours I worked out it was rooted and got another one which worked straight away.

Also generally applicable to ex wives and GF's.....

[deano59]

i was under the impression you entered your tyre size and diff ratio into the ecu and wired the speedo up to the ecu speedout put wire and away ya go ? . i was going to send my ecu to sideshow to have him do this to mine ?

cheers dean

[Modena]

The ecu puts out 4000 pulses per mile, the speedo needs to be calibrated to this.

[guye]

Dean and Ben are right, however my ECU doesn't have the PINS wired on the plug for VSS output. The Commodonor (VF) does need it, cause it uses the CAN-BUS and BCM for all things speedy.

So even if I got my ECU programmer dude to enable the VSS output pin, my cable and plug isn't equipped and I haven't worked out how or if I can add another PIN to my ECU plug. (I tried that last year for something else, but failed!)

Anyway, thanks Gregg and Gav and all. I am going out to the shed tonight to Edison it (eliminate all options), and either make it work or deduce the speedo is faulty! Watch this space...

(By the way, the fuel gauge is in that gauge too and it also doesn't work - but I haven't started debugging that yet!).

[guye]

Oh - by the way, my IM240 wasn't successful but only because we couldn't keep the car on the dyno! Turns out i stuffed up somewhere along the way and had my rear end toe +40mm LHS and -40mm RHS! Duh! At least they were parallel!

All realigned today (and geez it drives heaps better!), so back again tomorrow for the IM240. Then all I need is noise and speedo check hopefully Friday.

[gjkrv8]

Mate, what you really need is an oscilloscope (CRO) on the speedo signal then you'll know once and for all. Sorry I don't have one. I had to borrow one when I couldn't get my Tacho going - found out the signal peak-to-peak was too low and had to get the Tacho input modified.

Wish there was an iPhone "App for that" :-(

[Tenrocca]

I sent my Vss signal straight to the speedo. Means the \ECU isnt getting a speed signal that Ive heard can impact on things but at the time it was the only way I got it to work and it hasnt seemed to be an issue. One of those things I was going to look at when I got time so be interested what you figure out.

Cheers

[Modena]

Guye have a read of this, our friend Tim over in WA...in short, drive it in calibration mode, or have you already done that?

Speedhut Speedo to LS1-7 GMPP ECU - FFCars.com : Factory Five Racing Discussion Forum

[albanycobra]

yeah getting my speedhut into cal mode was a bit of hit n miss, got it in and did the 2 mile thing via gps and works spot on

[guye]

Ok I fixed it. I am a Legend! Anyone need help with vss stuff and digital speedos, call me. $200/hr! Minimum 4 hours.

Of course, if the manual with the speedos was better I could have worked earlier that the fuel level sensor and the speed sensor are not the same thing! I had the senders swapped! Funnily enough once I changed that BOTH gauges miraculously started working!

And I also fixed the stereo system! The remote control had a flat battery! Duh!

Righto - off to Vipac tomorrow. And noise test and show off my fantastic new speedo to the engineer on Friday and I should be done!

[Modena]

Don't forget to calibrate it buddy, we wouldn't the enginer drive test to be done at 240kmh

well done.