Which speed sensor? Wheel or gearbox?

just bought this

http://www.specialstage.com/classifi...uct=935&cat=23
(score! don't really need it now, but I just can't pass up good deals...)

specifically, I'm trying to figure out what sensor to use with it (not included).

either the wheel sensor:
http://www.cp-racing.com/product_det...ID=106&PID=276

or 'jap gearbox sensor'
http://www.cp-racing.com/product_det...ID=106&PID=270


can anyone shed any light on which is easier to install? more reliable? I doubt either can take much 'abuse', but is one stronger or less likely to break than other? I'm assuming the japanese gear sensor will work with my tranny? If not, I guess that makes the decision pretty easy.

They're both the same price....but the wheel sensor needs a custom bracket and some welding, I assume.


Thanks!
Jon

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Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

Both. One for backup.

you know, I was kind of thinking the same thing......install both, calibrate both.....wire them both up using a toggle switch in a control panel (that I haven't made yet, haha).........thx.

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Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

I do not know if you have awd or not but if you do not have AWD you NEED a wheel sensor on the undriven wheels.

I did my first rally with the gearbox deal on a RWD car, by the end of the 1st stage we had over 1 mile of error.

AWD car gearbox is easier.

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In the long run reality always wins.

I've got both. Started with a speedo cable sensor, found it was sortof ok for gravel events in a lower powered fwd car, but totally useless on the winter events. Installed a rear wheel sensor and wired them both into a toggle switch for redundancy. The rear sensor failed in the middle of a rally once, it was nice to flick a switch and still have a working odo, as long as you have the calibration factors for both sensors handy. Incidentally, the rear wheel sensor isn't all that accurate for winter events either as you tend to have the rear wheels dragging a fair bit with the lfb'ing. We run all recce and pace note events now, so my odo is really just a $500 clock.

thanks guys, now I just have to find where it goes on my tranny.

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Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

I'd go transmission for only one reason: it's easier.

Many discussions could be (and have been) had about accuracy of various setups, but since by the time you get to the speed where that accuracy would be important, you're running on stage notes, the odo accuracy is more moot now than ever.

(My run-on sentence skillz, let me show you them. )

Cheers,
Anders

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Grassroots rally. It's what I think about.

derek Wrote:
>
> I did my first rally with the gearbox deal on a
> RWD car, by the end of the 1st stage we had over 1
> mile of error.
>
Actually it depends on the brake setup too. We always lost miles from braek lockup by driving off the front wheel of an earlier RWD car. But when doing a speedo drive on the Starion (turbo, lots of wheel spin), heavier rear brake bias, and consequent occasional rear whell lock-up, actually made things equlize out.

Jon, did you specify your drive configuration?

Wheel mounted is much more subject to damage than a trannie drive.

Regards,
Mark B.



Edited 1 time(s). Last edit at 06/27/2008 11:49AM by starion887.

starion887 Wrote:
-------------------------------------------------------
> derek Wrote:
> >
> > I did my first rally with the gearbox deal on
> a
> > RWD car, by the end of the 1st stage we had
> over 1
> > mile of error.
> >
> Actually it depends on the brake setup too. We
> always lost miles from braek lockup by driving off
> the front wheel of an earlier RWD car. But when
> doing a speedo drive on the Starion (turbo, lots
> of wheel spin), heavier rear brake bias, and
> consequent occasional rear whell lock-up, actually
> made things equlize out.
>
> Jon, did you specify your drive configuration?
>
> Wheel mounted is much more subject to damage than
> a trannie drive.
>
> Regards,
> Mark B.
>
>
>
> Edited 1 times. Last edit at Jun 27, 2008 by
> starion887.


AWD.....stock WRX set up, so open diff in the front, stock 160R LSD in the rear. 4K center diff.

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Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

Hey,
I can't get yer links to work, so I don't know what you bought.

I run a cheezy looking terrortrip box that reads off a wire coming off the tranny on my WRX. Still works fine for me after 15 events.

I don't run a back-up anymore. I did on the first two cars that used hall effect sensors which read the wheel stud heads on my old front drivers. They got banged around.

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Ted Mendham
www.rensport.net

ah, the SS.com ad got pulled.

it is a brantz laser 3.

where on the WRX tranny does that thing go? easy to get to? I assume you just used the whole in the firewall underneath the brake pedal to run the wires?

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Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

I don't know much about Brantz.
I think we tapped into a green wire coming off the tranny.
Into a Trratrip DSI and on to a 202+.

www.rallylights.com has the DSI and instructions. Good people, but they don't sell Brantz.

Brantz has an equivalent interface.

Just remember it's the green wire on a rex.

This is a link to pretty much what we did.
http://users.sosdg.org/~melody/Rally/probe/

---

Ted Mendham
www.rensport.net



Edited 1 time(s). Last edit at 07/01/2008 12:25PM by tedm.