If one were to bypass the clutch switch (making the computer think the clutch was depressed all the time) would there be any other effects aside from being able to start the car without depressing the clutch (which I realize is a bad idea)?

I'm wanting to use the stock clutch switch for a 2-step rev-limiter and just want to make sure I'm not going to get myself into a pickle with the ever-so-smart Honda ECM

 

Hmm, well I know that VTEC doesn't engage when you pess down the clutch and rev... even if you're moving, nough oil pressure, temp etc.

But I'm not sure if that's due to the clutch switch, or the fact that the engine isn't under load.

[e]I think VTEC does engage, but it's not "loud" because the engine isn't under load.


[Modified by sackdz, 8:32 PM 10/23/2002]

 

Basically; Does the clutch switch do anything aside from only allowing the car to start with it depressed?

 

I think that would be from the engine not being under load...but, then how does the engine tell when it's under load?

 

You must be doing over 15-20-25 mph (something like that) for vtec to work. Computer has to sense several things before vtec will engauge. I am not sure about the clutch disable deal. I don't think its going to hurt anything. Someone correct me if I am wrong.

 

I've heard that vtec checks for "gear selection" and it seems that an engaged clutch would be neutral. I haven't verifed this.

 

Well, I'm not specifically concerned about vtec, but that is certainly something I don't want to miss!!!

However, if the engine determined that it was in gear by the position of the clutch, it should engage vtec when you are going at speed/temp and put it in neutral and rev, but I doubt it does, because there is still no load. I'm thinkin that I'll just try it out, as I don't expect it to really matter...if I'm not mistaken don't earlier models (pre 92/93) not have a clutch switch? My car doesn't even turn if you don't have it depressed, but my dad's 92 Civic LX sure does and lurches like a ****! haha.

Anyone know for sure what purpose this switch serves besides allowing the car to start only when clutch depressed?

 

So, I guess the switch only serves a purpose when the car is being started?

 

Wrong


[Modified by CivicEx95, 10:08 PM 10/22/2002]

 

It does engage if the clutch is depressed and you rev while at speed? hmm...I guess I never noticed. If that is the case, then I don't see what else the switch does...basically, I am installing a hacked launch-control/full-throttle shifting system and just want to make sure I don't need a seperate clutch switch as I think Hondata might use? (do They?)

CivicEx95, whereabouts are you in portland? any pics of your car?

 

That switch does 2 things.

Disables cruise control, prevents car from starting until it's depressed.

Won't affect VTEC activation.

 

so, if it thinks that the clutch is depressed, it won't engage cruise control? if so, crappy. Plan B...is this a 12v switch or ground? could I still use it for my two-step (circuit only needs to create resistance) and leave it intact?

 

Wrong. There is a seperate switch for the cruise.

 

That's all it does. It's not connected to the ECU at all.

 

rock on then, I didn't notice a seperate switch for my cruise, however...I was hoping I wouldn't need another clutch switch for my 2-step

 

Doh, you're right.

 

if your moving fast enough to overcome the VSS guidelines, VTEC will engage.

Little light on the dash sez so!

 

so, just to recap...

There should be two switches on my clutch already, since I have Cruise Control? (I only recall seeing one). And if so, each of those serves only one function? (ie. starting or disengaging cruise?).

Now, I just have to figure out why the car won't start after the 6btm install, then I can worry about the 2-step

 

Edited my first post.

I think maybe VTEC does engage, but it just doesn't sound like it because the engine isn't under load... thoughts?

 

that makes sense I guess...also, I would only encounter this when I am heel-toe shifting, and at that point determining whether or not VTEC engages is not my highest priority, ie. staying on line

I also posted something, related, in FI because I am installinga MSD 6BTM and want to make my own two-step rev limiter to use with it, but I think I managed to fry my damned ICM (car just stopped running after idling for 2 min after install and won't start now)...any thoughts on how to avoid this or whether or not it is common with an internal coil?...

 

Hillsboro. http://home.earthlink.net/~civicex95/car.html

 

Um no
your wrong.
vtec dosent engage if the engine isnt under load.
even if your going 90mph if you hit the clutch and rev the engine, it wont engage.
I see you have a GSR, your butterflies open at idle (wich is 5700) but your vtec will not engage at idle(wich engages at 4400)


[Modified by KAMiN, 10:26 PM 10/23/2002]