E30 obd2 vss

[hoveringuy]

Its still getting 'a' signal. Just a fractional one of the correct speed so as i mentioned it doesnt care in my experience.

So, if you're using the existing e30 signal, do you have a threshold speed where you can't rev over whatever rpms? Ie, can't rev over 5400 below 25mph?

[nando]

Yeah something like that.

[Mr.SWISS]

So, if you're using the existing e30 signal, do you have a threshold speed where you can't rev over whatever rpms? Ie, can't rev over 5400 below 25mph?

Yeah something like that.

WTF?!?

Never had that problem with my car and I used Dave's wiring chart for VSS.

[nando]

maybe you need really short gearing to notice it. Or it could be a specific DME coded to a specific ABS module.

It does seem odd that nobody noticed this before. Also I spit out a 9-tooth signal to an MSS54 dme and it read pretty much normal, so I don't really understand why BMW would have done it this way for basically 3 years of E36 production only.

[328ijunkie]

So, if you're using the existing e30 signal, do you have a threshold speed where you can't rev over whatever rpms? Ie, can't rev over 5400 below 25mph?

Well thats whats happening to the OP but as ive said 234234 times. never EVER had this happen. I can hit 7400 at any speed on my drift car. and all my other customer cars and all the people ive done flashes for have never had this issue either? Obviously the ECU is seeing not 100% the correct signal but all it uses it for is a soft rev limiter if it does in fact code (soft or hard) which ive never had happen.

[alndks]

So, if you're using the existing e30 signal, do you have a threshold speed where you can't rev over whatever rpms? Ie, can't rev over 5400 below 25mph?

I have this problem in traffic. When i have slow speed for 10-15 minutes (under 8km/h) and i suddenly hit the 1st gear to redline it stops in 5400. Then code 0500 stored and no cell. After a while it revs to redline on all gears with no cell.
But i have to clear the code because it is still stored. It does happened very often but it happens

[Wanganstyle]

for OP-

are you using a E30 speed sensor in the diff or a E36 unit?

there are 2 e30 speed sensor styles and also more than 1 part for e36/e36-7 speed sensor.

the tone ring is smaller for the e36 units and the sensor changed. e28/30/34 all use a larger diameter tone ring than e36

[alndks]

I have e30 sensor and I also have orig cluster

[Mr.SWISS]

maybe you need really short gearing to notice it. Or it could be a specific DME coded to a specific ABS module.

It does seem odd that nobody noticed this before. Also I spit out a 9-tooth signal to an MSS54 dme and it read pretty much normal, so I don't really understand why BMW would have done it this way for basically 3 years of E36 production only.

I rock the ZF with my 3.73LSD :-? shopping for a 420 now finally.

[evandael]

steve/hoveringuy.. with your converter circuit, how would you wire it to run the ABS sensor wires into it, and the converted speed signal to the DME out, while also still having a complete circuit for the ABS sensor?


i've tried to look at it for a while now but my brain is not cooperating.

[hoveringuy]

steve/hoveringuy.. with your converter circuit, how would you wire it to run the ABS sensor wires into it, and the converted speed signal to the DME out, while also still having a complete circuit for the ABS sensor?

.

It just taps the ABS signal, tees off it. One wire of the ABS pair is the signal and the other is common with ground. The ABS doesn't "see" the tap and will continue to work normally. The circuit amplifies the signal strength into something that is useful for the ECU.

The circuit works fine, I'd still like to know why some OBD2 cars have this issue and others don't...

[Wanganstyle]

I have e30 sensor and I also have orig cluster

Perhaps change to obd2 sensor from e36 and the smaller diameter sensor ring Inside the diff.

[alndks]

And then the cluster and obc will not work correctly

[328ijunkie]

Yes. You can verify with the contact I sent you.

The ABS "sees" very high impedance with circuit connected, almost nothing is drained from the ABS so it works normally. The output signal will be a pseudo-VR signal.

What is everyone else with OBD2 doing for the VSS signal???

Wheres my PM :(

[Wanganstyle]

And then the cluster and obc will not work correctly

cluster does work properly; This worked on my own e30.

obc.... who knows; but I'd guess it would work just fine