Any of you Activate Vtec with a Tach?

i'm doing this for now, till i get a VAFC, but i was wondering if any of you tried using an aftermarket tach with shift light to activate it? What i'm using is a d16y8 engine with pm6 ECU in a 90 CRX. Does it suck horribly? or what, post your experience.

I dont really understand what your saying. Do you like set the aftermarket tach to say 4,500 rpm and when u go over that, that is when vtec kicks in?

it would be the same as using the external shift light with rpm plugs....i wouldnt say it sucks....works better than no vtec ;)

You do realise that the engine designers at Honda drew onan infinitely greater knowledge of the characteristics of VTEC to come up with the change over point don't you? The only reason you'd change it is if you went massivly different cams etc. Otherwise it's just stupid although I do understand that a lot of ricers like the sound coming in earlier and convince themselves that the car is making more power.

oops - I left out: Put the right bloody ECU in :?

Otherwise it's just stupid although I do understand that a lot of ricers like the sound coming in earlier and convince themselves that the car is making more power.


i wouldn't do that.....i'm setting it to kick in at 5200. I can't use the "bloody ECU" in because i would have to convert to obd2, i rather stay obd0.

blah some of us dont have the right ecu.....most have an after market tach so why not us it for the time being.....i say its worth it untill you can get the right ecu or a vafc of some sort.

yea, i'm getting a vafc right after i pay for my full body kit.

you can convert to OBDI.

Show before go, awsome.

nah, i had plans on getting shit done, and i can't just tell the guy that i bought the kit off of that i have to delay the payment by 2 weeks.

you can convert to OBDI.

Show before go, awsome.

thanks for the attitude.

*edit* took out some crap i said, not worth my time to get into an arguement.

So why did you even start this thread in the first place?

Those that know say go to OBD1, but you want to do it your way.

Waste of time

use the shift light and get your ECU chipped with b16 maps.

thanks for the attitude.

*edit* took out some crap i said, not worth my time to get into an arguement.


It wasnt an attitude, it was a opinion. Are we all not allowed an opinion? You prefer show before go, I prefer go before show. If you do a swap right, you will gain more out of it.

Okay, say you say cost is a big factor. If you were to pickup a RPM activated switch, and a set of pills, your knocking on $100. That $100 could be put towards a P28 ECU. Then, you seem to know a little bit about what you are doing. Hop on the forums, and read up on how easy it is to convert to OBDI. Or, save your lunch money for two weeks, and buy a conversion harness for $125.

Ouch, too much money is spent on trying to make your car, something you are using probably every day, to run correctly. :screwy:

Good luck with that body kit though. :bigthumb:

us newyorkers been doing that,wiring vtec to the tach light, u gotta make sure u do it rite because VTEC can stay on all the time,and thats not good for the motor

i know it's the ghetto way to activate Vtec, but i'm only doing it till i get the VAFC, which is in 2 weeks.

us newyorkers been doing that,wiring vtec to the tach light, u gotta make sure u do it rite because VTEC can stay on all the time,and thats not good for the motor
It's not that that its bad for the motor. It's perfectly fine. All you are doing is driving on the bigger cam lobe. It's not like nitrous where it wears your motor out faster.

why dont you just wait for it to come instead of chancing to screw something up

so is there an online instructions on how to do this? or any of you guys can explain how to instead of tell me i shouldn't do this.