Another build thread

[Johno]

Hi,
Correct me if I'm wrong but I reckon Skov is replicating the clutch switch fitted to the MX5 with a pressure switch.
On the MX5 there is a mechanical switch which the spring often fails and causes problems when the clutch is engaged with regards to engine revs I believe, some sort of emission thingy.

Johno

[skov]

Hi David,
Here's a slightly better picture of what I've done:



I've got the clutch master going to a t-junction, which then goes to a flexi hose to the slave cylinder and a brake pressure switch to replace the clutch switch I lost from the MX5 pedal box.
I'm not convinced there's going to be enough pressure to operate the switch, but it's worth a try!
It won't do any harm sitting there if it doesn't work, and the t-junction puts the flexi hose in a better position anyway

[skov]

Originally Posted by Johno

Hi,
Correct me if I'm wrong but I reckon Skov is replicating the clutch switch fitted to the MX5 with a pressure switch.
On the MX5 there is a mechanical switch which the spring often fails and causes problems when the clutch is engaged with regards to engine revs I believe, some sort of emission thingy.

Johno

You beat me to it Johno!
That's exactly what I'm trying to do. Still not sure it's going to work mind!

[Johno]

Hi Skov,
Sorry about butting in....
I can't see a problem with the switch idea as I guess it's the same switch as the one used on the brake pedal.
Had another bash this weekend with the wiring and think I have removed most of the redundant wires but only time will tell.
The way you are going you better be booking the IVA soon....

Keep up the good work...Johno

[skov]

Originally Posted by Johno

Hi Skov,
Sorry about butting in....
I can't see a problem with the switch idea as I guess it's the same switch as the one used on the brake pedal.
Had another bash this weekend with the wiring and think I have removed most of the redundant wires but only time will tell.
The way you are going you better be booking the IVA soon....

Keep up the good work...Johno

No worries

It is the same one I used for the brake, I'm just worried there's not going to be enough pressure in the clutch line to operate it.

Leaving redundant wires in the loom isn't a problem, it's removing ones you do need! Already had to put a couple back in where I got a bit carried away with the scissors

[Davidbolam]

what does the switch in the clutch do? I was hopeing this could be bypassed

[skov]

Originally Posted by Davidbolam

what does the switch in the clutch do? I was hopeing this could be bypassed

It's an emissions / fuel economy thing. Most ECU's will stop injecting fuel when you're slowing down on closed throttle - but will start injecting again if it's put in neutral or the clutch is depressed (to stop the engine stalling).
If you just leave the switch out the revs will dip, and possibly stall when you stop.
If you bypass it it'll probably be fine, but use more fuel.

[motomaniac]

Skov, i would think there'd be no problem with the switch, i have them fitted to my bikes and you just need the slightest of pressure to get them working and light up the rear light, so it should work ok..

[Johno]

Hi John,
Looking good as usual..
My colleagues at work have issues with hydraulic pressure switches saying they will fail but like you I will be fitting them... Good idea about the clutch switch by the way. that's what I will be doing now

I believe the only reason they fail on older vehicles is because of debris in the lines built up over the years. With new lines and new fluid this should not be a problem... just my thoughts.

Johno

[SeriesLandy]

Ash said he has had 3 fail and changed his (brake) switch to a mechanical one.
Also Coozer over on LB Link