heinrich

LOL Louie ... well, I use my WOT switches very often. I think I'd know if they were inop. I meant I might not see you again because you may never drive your Porsche!!

Louie928

I have others than *that* one I can use. Between my neighbor and myself, I think we'll never run out of 928s.

derporsche928

Hey Louis, PorKen, Heinrich,
You guys are definitely beyond my tuning knowledge and abilities here, but what the heck, I'll try to play with the big dogs..... Till I get sent back to the porch.... tail between legs.....
I too was thinking as a work-around for varying requirements, or as a function-test for the average-joe, wiring in an extra set of switches (idle / WOT) right on the throttle cable bracket, or as PorKen suggests, tied to the accel pedal.... You could wire them in a switchable, parallel circuit, and then tune or test with / to each set..... Like one set for street and one for race.....
I also thought about revising the WOT plastic slope in the factory switch to modify when it makes.....
This thread is getting better all the time......
Just a little puppy now, but one day......
Best,

SeanR

Bump.

Fantastic thread.

Here's one I've not found yet and it sort of is along these lines.

TPS/WOT test on the hammer. Idle switch works great, opens/closes as it should. Test the WOT and it shows "open" no matter the position of the throttle. Now is this telling me that the WOT switch is sending the signal the gas is down at 70% or more, even at idle since it's reported as open?

Any thoughts on this one?

Louie928

The WOT switch is telling the LH & EZ-K that you never open the throttle above where the WOT switch should operate (close), or around 70%.

SeanR

Ahh. So I was reading it in reverse, basically this switch is faulty and the Hammer is telling me that WOT is not opening (closed) at all.

Correct? Or did I just flip it again.

jon928se

At wide OPEN throttle, the WOT switch contacts CLOSE, making the circuit.

At small to medium (exact point varies as noted earlier) throttle openings, the contacts are OPEN breaking the circuit.

ew928

Just checking.
Are you testing the WOT activation (as in closing) at just the throttle pedal or by rotating the throttle quadrant as well?

Bunch of us ran the computer test at Frenzy this weekend. Quite a few had no WOT signal at LH. Think many were found to have less than optimal tightness on the throttle cable. At least mine was. Unscrew out the adjuster some and all is good again.

Much easier faster cheaper fix than a dead WOT switch or bad wiring.

Louie928

Yup. You have it right.

Alan

Jumping back in time here - I believe the updated variable position detection TPS is only installed on AT cars while MT have the old style switch - the schematics don't show it this way in '94 but it would make sense since only the KD relay (not featured on MT) uses this extra variable signal. It would also mean the TPS connector would need to be different between AT & MT of course.

My car certainly has the simpler 3 pin switch (I had to change it out already).

Alan

Bill Ball

When I put my SC back on recently, I cut open the WOT switch which no longer worked. Nothing was obviously wrong inside. I re-soldered all the butt joints noted earlier in this thread and it started working, tripping WOT at about 3/4ths throttle.

So, one of the butt joints had separated even though it was not obvious. For those who still have some WOT switch function if they really snug up the throttle cable, but it comes on late, this is a sign that the switch is failing, probably due to a weak joint, and it will eventually fail completely.

Louie928

Yes, I think that is all correct.

SeanR

Thanks Louie,

Wanted to make sure what I was reading and my thoughts were correct. The hammer doesn't give step by step instructions.

Glenn M

Mine was one of the ones which read bad at Frenzy.

Glenn

John Speake

Thanks Alan for that useful info ! Logical, as you say.....