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I just installed a blue led vtec indicator on a 02 EX coupe. I followed the instructions from a website. I used a 330 ohm reistor on the led and tapped it to the green w/yellow stripe wire of the ECU. And grounded the other end of LED. NOW,,, the problem is that the LED comes on around 2,500 to 3,000 rpms depending driving conditions. It stays on all the time on the freeway going 70 mph @+ or - 3000 rpms. Isn't the vtec engagment at around 4,500 RPM ? Did I tag the wrong wire? BTW, I looked under the hood at the vtec solenoid, the color of the wire is also green w/ yellow stripe.

 
Rep Power: 347

Well, you did it exactly right
VTEC engages around what you are saying but it doesn't kick in fully until around 4500+ rpms.

 
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yep... u did right

our motors seem to have a sorta ivtec ... I don't think it's 3 stage ... maybe 2 stage (2500, 4500 rpm)

 
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you did it right...mine does the same thing...kicks in at about 3k....you cant "feel" it kick in it about 4.5k though. vtec stays on when you are cruising above 65-70 mph to.

 
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what is the whole point in having one in your car? it doesnt do anything special

 
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Looks, I get comments on how it is cool, and I don't want to take it out and leave a hole in my dash, thats the only reason it is still there.

 
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Thats pretty cool I wouldnt mind building a setup sort of like how a bimmer has lights going backwards the closer you get to redline on the tach.

 
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My LED in located inside the instrument gauge cluster between the tach and speedo. Anyways, how do I get it to light up at 4,500 rpms instead of 2500+rpms? I am currently using a 5 volt LED, would say a 12 volt LED keep it from lighting until 4,500rpm? thanx. If it doesn"t work, i might convert it into a shift light instead.

 
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they say thats right.

vtec does engage at that point and the other points..

diff. stages.. still debatable on our vtec stages... is certainly not totally like the prevoius gen.

 
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you cant change the led and get the computer to change when it engages VTEC. it doesn't work like that. The general assumption is that the timing advances when the light comes on, and the cam profile is shifted later on in the process... probably by some kind of oil pressure sensor.

 
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SO WHAT WE NEED is that SIGNAL from the oil sending unit that pushes the cam over,, anyone know which wire this is?

 
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The Vtec timing part engages at full throttle above i think 2500 or so, then at 3000-3200 no matter what.
I think it actually switches to the other lobe at 4400.

I think the signal from the oil sensor goes to the ECU, then to the solenoid.
Im not sure how it works, but i would rather that the light come on at 4400 than all the time at 3K, wouldnt you?

 
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The wire color of the VTEC oil pressure switch wire is blue w/ black tracer. It's located on the same ecu (white) harness plug. I tried tagging that wire instead and the LED still lights up at around 3,000 rpms regardless.

 
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what about that VTEC (blue wire) solenoid wire under the hood? what if we tap into that...

 
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That might work.
Give it a try and let us know what happens.