Speed sensor 1g w4a33 in 1g 3s awd

[Hard AttacK]

Hello I have been putting around town breaking in the engine of my Stealth with no tach. I am getting ready to do some more stuff before taking it to get tuned and would like a tachometer that communicates with the ECU.

The 1g 3s uses the same connector as the 2g DSM for the speed sensor. I have a early 1g awd w4a33. Has anyone used a 2g DSM speed sensor on the 3s plug and play?

 

[steve]

None of the USDM cars got automatic AWD's, they were all Turbo Manuals, either 5 or 6 speed depending on the year.

I believe there were NA auto AWD in other markets outside the US. Is your car one of them?

The tachometer on the 3S is driven from the power transistor module just like the 91-99 DSMs. The Speedometer was electric like 2G DSMs. I don't have CAPS/ASA handy to check if the sensor is the same and which set of gears would be used. Those differed based on the gearing.

 

[Galant665]

I sold a 2g GST auto speedo gear to a guy with a similar type project last year. He was trying to get a signal for his haltech. Can’t remember what all he did to make it work.

 

[Hard AttacK]

None of the USDM cars got automatic AWD's, they were all Turbo Manuals, either 5 or 6 speed depending on the year.

I believe there were NA auto AWD in other markets outside the US. Is your car one of them?

The tachometer on the 3S is driven from the power transistor module just like the 91-99 DSMs. The Speedometer was electric like 2G DSMs. I don't have CAPS/ASA handy to check if the sensor is the same and which set of gears would be used. Those differed based on the gearing.

Thanks for the reply! Originally a 91 3s AWD 5 speed manual, now swapped to 6bolt/early W4A33. With the DSM auto ratio you have to swap to the 2nd gen 3s 6 speed rear end which i have done. I have been reading about the ratio differences/tooth count.

Lots have upgraded to the 2nd gen speed sensor for ECMLink correct?

I sold a 2g GST auto speedo gear to a guy with a similar type project last year. He was trying to get a signal for his haltech. Can’t remember what all he did to make it work.

Messaged back thanks for the heads up would definitely be interested in knowing as much as possible.

 

[steve]

Lots have upgraded to the 2nd gen speed sensor for ECMLink correct?

I've not read much about it. The ECUs don't depend much on the VSS signal unlike the TCU.

I'm still confused by by your first post stating "would like a tachometer that communicates with the ECU". The VSS doesn't play anywhere in that. The ECU gets it's engine speed information from the CAS on a 1G or the Crank and Cam sensors on a 2G. The gauge cluster tachometer gets it's signal from the Power Transistor on 91-99 cars and from the tach gate on the 90 cars. The 3s tachometer might have issues with the 4G63 output vs the 6G72 signals from the PTM.

So what issue are you trying to solve? Needing a working VSS for things like launch control shouldn't be too critical as long as there is a signal but there are several other systems in the 3S that do depend on the VSS and that it's normal to what they expect WRT pulses/tire RPM.

 

[Hard AttacK]

So what issue are you trying to solve? Needing a working VSS for things like launch control shouldn't be too critical as long as there is a signal but there are several other systems in the 3S that do depend on the VSS and that it's normal to what they expect WRT pulses/tire RPM.

Ok Thank you so much it seems I am I'll informed. I was under the impression I needed a VSS for launch control and ECU input for tuning.

Currently the issue I am trying to solve is I have no speedo or tachometer. Not worried about a speedo as much since I can use GPS. There is a rev limiter on the car it feels like around 4krpm I assumed it was set to a default rpm because no input from VSS, but I guess that is incorrect.

The 3s tachometer might have issues with the 4G63 output vs the 6G72 signals from the PTM.

Ok perhaps this is an issue? Others are using the stock 3s PTU. Seems there's quite a few swaps out running now I would love to know how they are configured.

Also I have no TCU just using a shift box lite with buttons for now

 

[steve]

If the issue you're trying to solve is "There is a rev limiter on the car it feels like around 4krpm I assumed it was set to a default rpm because no input from VSS" post the ECMLink log. You may in fact have a limiter configured.

With ECMLink there is an option to disable launch at or above X mph and that does depend on having a working VSS but the rest of the limiters are RPM based and the ECU get it's RPM input from the CAS sensor(s). There are some options for Antilag/FPS/EGR that can use VSS input too but those aren't limiters.

I expect the factory cluster tach is going to have issues due to the 4/6 cylinder pulses from the PTU, I don't know how others got around that.

With the speedometer the factory gauge should function fine with a 2G VSS as long as you have the correct gears.