.::evil inside::.

Hey guys,

I've just purchased a couple of Honeywell GT101 hall effect sensors to monitor the driven wheel speed, however I bought two in case I wanted to try out traction control by gathering undriven wheel speed data. So my main focus is on setting up the one GT101 on the driven wheels and I'm at a loss as to what might be a good way to achieve this.

My first thought was to set up the sensor to pick up the shield on the yoke of the driveshaft, at which point I remembered that my custom driveshaft doesn't have one

My next thought was to try and mount it so that it picks up the uni joint lobes. Can anyone tell me if this will work?

It seems like it's going to be pretty involved if I try and set it up around one of the rear hubs, so I figured I'd stick to trying to pick up a signal from the driveshaft.

Oh, the other idea I had was making a trigger wheel and pressing it on to the driveshaft yoke in place of where the original dust shield would have been. Not sure how I'd do that without damaging the surface of the yoke though.

So if anyone has done this before or has any ideas or input on a good way of mounting a GT101 to pick up the driven wheels that would be awesome!

Cheers.

RGHTBrainDesign

I can't really think of an economical way of doing this (yet), so I'm holding my thoughts here. Subscribed. Definitely interested to see what you find out. I'm using a Toyota 8" Solid Axle rear out of a 4Runner, and front is FC S4 without ABS hubs.

Something I can think of off the top of my head is doing a search for "Ford Tone Ring" on eBay and they come up for $10. Machine the hub to place them/press them on and build dangly brackets for your GT101s.

chuyler1

iTrader: (1)

I don't know if this applies to all model years but the '85 gauge cluster has a speed sensor in it on the speedometer which sends a signal to the factory ECU under the passenger seat. I don't know whether that signal will play nice with Adaptronic, but it was my intention to find out this fall when I start my build. Page 23 of the '85 Body_Electrical PDF shows pin 7 on the connector is a speed sensor. Page 23 of the '85 Electrical Diagrams PDF shows it ending up at pin h on the ECU.

For my build, I'm going EFI and direct fire on a street ported 12a using a 440d Select. I hope to pull the factory ECU and make use of most of its connections for the Adaptronic ECU. There are a bunch of leads that go right to the engine bay for the various solenoids and carburetor stuff that I obviously don't need anymore. I've started mapping them out so I can just build a harness that connects to the factory plugs in the car and the engine bay. I have all the harness plugs already, ordered from www.mouser.com.

.::evil inside::.

Thanks for the replies fellas.

Unfortunately I have factory(ish) 82 parts in my car. I think it's equivalent to a GSL or similar in your market. So I'm not sure I'll have any real provision for a tone ring to be installed on the hub. I've been having a lot of difficulty finding some sort of range or specification for what wheel signal the GT101 would like to see so I'm not entirely sure what I can get away with here with clearance etc.

Here's a picture of the back of a brake rotor for reference.


As I mentioned, it's the driven wheels that are the priority for me anyway, but it would be nice to come up with a solution for the front too.

With regards to the ECU signal on the gauge cluster, we didn't get the updated dash that you guys did and unfortunately this sensor isn't present on Australian delivered cars.

If I get the chance I think I'll have to wire up one of the sensors with a long loom and just hold it next to the front driveshaft uni and see if I get a signal while the car is running on stands or something

KYPREO

Speed output is on Australian-delivered series 3 clusters for factory cruise control. That is what I will be using for ECU vehicle speed functions.

.::evil inside::.

Oh, perhaps I should get my hands on a series 3 cluster then!

chuyler1

iTrader: (1)

@KYPREO Any luck getting this to work? I connected the original emissions computer speed sensor input (pin h black/red) to MVSS1 (pin 1M yellow/brown) on the Adaptronic Select 440d. I got the car up to speed and clicked "Learn All" but got nothing.

Update: I switched the MVSS mode from Reluctor to Digital and started getting a signal. Even when I click learn it seems to think I'm going about half the speed I'm actually going, but the big win is that it knows when I'm moving and when I'm stopped so I can use that to program the idle control.

KYPREO

@chuyler1 I haven't played with this yet, as I'm not up to the ECU/wiring stage, but thanks for the update - it may come in useful for me as well. Another option is to use an adapter on the speedo cable from the gearbox. I believe Autometer makes one, designed for retrofitting electronic speedos into cars with mechanical speedo drives.

Also, doesn't the Adaptronic Modular an accelerometer and gyo meter inbuilt to measure vehicle speed & acceleration?

chuyler1

iTrader: (1)

Not sure about the Modular ECU, I'm working with an older Universal Select 440d.

KYPREO

Ah ok, understood. Glad you have got it halfway sorted so far.