Effects of no SPD signal to ECU?

[CrUZida]

I'd of thought it was the same for the MA70 too.
Yeah the 1jz has it's own PPS ECU aswell, but it needs the speed sensor wire hooked up to it so it can disengage the PS at about 65km/h or there abouts. I'm not sure how the MA70 one works as my ma70 didn't come with PPS, surely it'd be the same tho, and requires the spd signal?

You've gotten yourself confused i think.

This thread is about hooking up the SPD to the Engine ECU after an engine conversion.

Where a car has a seperate PPS ECU, there is already a connect to it, and thus nothing is needed to be done.



And Norbie, the dash has a 4pulse/rev output for the factory cruise control, just use that.

[The Witzl]

There are, most GOOD instrument shops will have them (example, Mobile Instrument Services in blacktown NSW)......

GT - sorry, you are correct about the 7800rpm cut on the 20v.... however that SHOULD be 8200rpm!!!

Josh is also correct re. idle functionality.

It IS worthwhile doing. You will also find that on a majority of EFI toyota post 1985 that the speedo, although mechanically driven, has a "4P" output!! (4-pulse/revolution) Have a search around for the 20V "speed signal fix"

[ra23celica]

And Norbie, the dash has a 4pulse/rev output for the factory cruise control, just use that.

What would be a good option if you did not have this to use, say on a RA23?
Thanks.

[Cool1]

Holy crap, the MiNES ecu must have this crap feature removed.

Has anyone tried just giving the ecu a dummy pulse?

[The Witzl]

yes - plenty of people have...... but it's still a signal that's relatively accurate to the actual signal the ecu should be getting.....

http://www.twincam.org/forums/index.php?showtopic=397

[CrUZida]

but never actually seen one.

Thats for a Delco ECU, not sure of the output ($115)

Sideshow also has Toyota ones I believe.

[CrUZida]

yes - plenty of people have...... but it's still a signal that's relatively accurate to the actual signal the ecu should be getting.....

http://www.twincam.org/forums/index.php?showtopic=397

Quick note here Karl.
The dash output is 4 pulse per rev of the speedo cable, which is usually doing ~1/3 the revs of the driveshaft.

So for every 3 turns of the driveshaft, the dash output is 4 pulses.
Putting 2 magnets on the driveshaft would give 6 pulses per 3 turns of the driveshaft, so you'd be better off to use 1 magnet on the driveshaft, and one bit of similar weight alloy on the other side to keep the shaft in balance.
This is what old Toyota auto's have, and its what GT did to his Crown box to get it to work.

[-GT-]

GT - sorry, you are correct about the 7800rpm cut on the 20v.... however that SHOULD be 8200rpm!!!

Really? I thought that was only blacktops, and silvers were 7800? I've been searching and can't find anything to confirm either way (except something i said on the old forums, so that doesn't count).

As to the timing change, would it be retarded, and costing a bit of power?

[urantia]

You've gotten yourself confused i think.

This thread is about hooking up the SPD to the Engine ECU after an engine conversion.

Where a car has a seperate PPS ECU, there is already a connect to it, and thus nothing is needed to be done.



And Norbie, the dash has a 4pulse/rev output for the factory cruise control, just use that.

Right you are.

[wilbo666]

Hmmm, sounds like it might be worthwhile hooking up my speed sensor one of these days.

Has anyone successfully done this in conjunction with an old-style speedo cable? I've heard there are adaptors that allow you to run both at the same time, but never actually seen one.

The MA61 dash has an output norbs...but that would mean you would need to fix ur speedo anyway (on that note, now that I have an alloy plate box as opposed to a steel plate one my speedo no longer works...similar circumstances to you...perhaps the steel plate speedo drive bit is shorter / longer? I know it is not the cable / drive...!).

I tried looking into what the spd signal actually did and no one could tell me. Mine isn't connected, however I ran a wire over from the dash area so that I could hook it up one day...

Cheers
Wilbo

[JustCallMeOrlando]

I'm using my factory 1GEU speedo gear and cable from an alloy case W57 in a steel plate W58. It works fine

[Drifty Midship]

This is on a stock 1st gen 4agze, 'cept for a HKS pulley. The sender and gearbox output shaft (E51) are stuffed with little to no chance of getting the speedo to ever go again in OEM config... Basically I was trying to see if leaving it with no speedo will have adverse performance affects.... beside error light always coming on.

Cheers

[Norbie]

The MA61 dash has an output norbs...but that would mean you would need to fix ur speedo anyway (on that note, now that I have an alloy plate box as opposed to a steel plate one my speedo no longer works...similar circumstances to you...perhaps the steel plate speedo drive bit is shorter / longer? I know it is not the cable / drive...!).

Stuffed if I know what's wrong with my speedo, but I'll worry about that when the Getrag is installed. One day.

Is this speed output from the dash the same one which goes to the cruise ECU?

[JustCallMeOrlando]

Yep, that's the one they're talking about bud.

[Hydra]

I hooked up SPD to the dash sender in my GA61 only because the check engine light was getting annoying. I can live with the speed limiter (I doubt it's accurate in my car anyway, I need to test this).