I'm coming in late on this, but I agree with matrix... I installed modifry's shift beeper and connected a 12V radio shack siren under the cupholder that kicks in at 5k. My sister nearly died when I experimented on her! It's a great product

 

I was scanning the posts to see if this was mentioned. The coolant temperature sender is going to have a set voltage or resistance to indicate the coolant temperature. You could install a hidden dual pole switch that re-routes the signal from the coolant temp sender to a voltage regulator or resistor that is "tuned" to tell the ECU that the coolant temperature is about 130 degrees F. The rev limitter would kick in at 7K RPMs, and VTEC would not engage. The "offender" would also get a scare, and feel nervous about it.

 

Great idea! Too bad it doesn't work. If the engine is warm, and you tell it it's cold, it will run like crap even when below the cut-off rpm. And it could foul the plugs too and mess with your oxygen sensors and maybe even your ECM fuel trim settings. All bad news.

I tried a variation of this idea when developing the Redline shift indicator (referred to by others in this post - thanks guys for the plug). My idea was when engine rpm exceeds the user-set threshold, momentarily change the temperatue sensor and let the ECM safely limit rpm's the way the engineers designed it. What I discovered is that the temperature sender reacts instantly to temp changes, but the ECM does not. It takes the ECM a minute or more to "see" a significant temperature change.

I determined this by measuring the voltage sensed by the ECM during cold and warm conditions, and then substituted a circuit to simulate whatever temp I wanted. When you start the car, the ECM takes an "instant" temp reading to use for a starting mixture, but once running it is very slow to react. On a warm engine, if I changed the temp input voltage suddenly to simulate cold conditions, nothing would happen. If I left it "cold" for a while, after a good minute or so the engine showed signs of running rough. When the setting was changed back to "warm", it was almost 2 minutes before the idle cleared up again. Both of these time delays corresponded with the slowness of the dash temperature gauge to update the display, which makes sense, sinced the gauge is controlled by the ECM.

I have no doubt you could wire the output of my Redline module to a relay to disconnect the injectors and stop the engine dead in it's tracks, but I don't know what the consequences would be. Would the CEL come on because the injectors are missing? I don't think it would hurt the engine because it's basically the same condition as running out of gas (which I've "tested" on several occasions ).

.

 

[QUOTE]Originally posted by modifry
[B]Great idea!

 

I think the car already comes with a rev limiter that does this. When the car is cold it will only rev up to 6500 or 7000 and then hit it's limit. It only after the car warms up that it is allowed to rev up to 9000. When I just start up the s2000 and not warm it up I hit a rev limiter right around 6500 to 7000 RPM. If this is the case why can't we put a switch in the temp gauge to set it on cold and activate this?

Billy

 

[QUOTE]Originally posted by billyjoho
[B]I think the car already comes with a rev limiter that does this.

 

[QUOTE]Originally posted by dgarnett
[B]I wouldn't feel so bad about a Valet Parking Attendant taking my car if he could only hit 3k rpm

Ok, so is the S2000 drive by wire?

 

Even if no one wants to use my idea, please someone comment on it.

I think it would be convenient if I could flip a switch and drastically reduce my car's performance.

Anyone...

 

I will not mess with any after market limiters, alarms. Fook valet boys and girls. The ONLY time I will let someone drive my car is 1) close S2k owner for eval purposes. 2) dealer for eval purposes. If ether goes into vtec, fine. I don't think it hurt my engine. Hell, I vtec all the time. Wuz the prob?

 

Oh ya, vtec while testing the brakes. I'm sorry to hear about that. Find another dealer to go to and provide negative feedback for the one the screws you.