VTEC at 6100-6200rpm, why?

[Tim]

I know VTEC normally comes in at around 5600-5800rpm, so is there any reason (other than an inaccurate rev counter) why mine is different?

Thanks.

 

[Niall M]

what car??? EK4 comes in at 5800 and EK9 comes in at bout 6100...
Higher in the ctr because of the higher rev limit and more agressive cam profile which makes more power higher up then the B16A cams...

But honda clocks are also usually wrong by a bit too...

 

[Tim]

Says under my username buddy, EK9.

So it's normal? All the EK9 vids I've seen have VTEC change-over points well under 6000rpm. They must have lowered them, then?

 

[Tim]

Using rvm's vid here as an example: http://www.youtube.com/watch?v=NiqTGe77PSw

Clearly well under 6000rpm, and in his spec it says his engine is fully stock?

 

[ManosEK9]

Says under my username buddy, EK9.

So it's normal? All the EK9 vids I've seen have VTEC change-over points well under 6000rpm. They must have lowered them, then?

Honda set the vtec at 6200 rpm for the EK9, so any EK9 you see kicking below or over 6200 rpm has alrtered vtec point. Mine kicks at 5800 because I've changed it.
Vtec technology has some extra needs and perhaps peculiarities . Wrong quantity of oil or bad oil quality may result in VTEK (Variable Time Electronic Kick ) . You may experience different rpm vtec kick also when your try to race with cold engine(cold oil) or you might loose the vtec crossover . One day last winter, I tried to test the car being cold and I remember I reached 180 km/h without vtec. The engine was unable to enable vtec in every gear!! The car was accelerating more or less like a normal car
DC2 makes 130 bhp just before vtec and EK9 makes 125 hp(I think)

 

[blinx9900]

Using rvm's vid here as an example: http://www.youtube.com/watch?v=NiqTGe77PSw

Clearly well under 6000rpm, and in his spec it says his engine is fully stock?

rvm has a phearable ecu and chip, his vtec has been altered, when i was using a factory ek9 ecu it was crossing over at 6000rpm, most digital displays also show 6000rpm, i believe it looks like 6200 due to the inacurate factory tach, but i believe stock cross over is 6000

 

[ManosEK9]

rvm has a phearable ecu and chip, his vtec has been altered, when i was using a factory ek9 ecu it was crossing over at 6000rpm, most digital displays also show 6000rpm, i believe it looks like 6200 due to the inacurate factory tach, but i believe stock cross over is 6000

What you say most probably is true because analog and digital are just two different worlds!!! So, I believe that all EK9s have their needle pointing to 6200 rpm when it kicks but the actual rpm is 6000
You always have to trust digital stuff!!

 

[Georgio]

I had my vtec set at 5600rpm before i took out the afc neo, now it kicks in at 6000rpm on the analog tach. However the tach reads 9000rpm when the rev limiter kicks in, the car is currently 100% stock. Im guessing that my tach just becomes inaccurate in vtec or else theres something i don't know about.

 

[rvm]

Using rvm's vid here as an example: http://www.youtube.com/watch?v=NiqTGe77PSw

Clearly well under 6000rpm, and in his spec it says his engine is fully stock?

Hello! My engine is fully stock, but I have a chipped ecu, when I used the stock ecu, the vtec kicked in about 6000 - 6200 RPM

 

[Martin_EK9]

vtec is at 5900 and max revs 8900, but my car has a dc2 ecu.

 

[Tim]

Ah thanks guys, seems mines perfectly normal then

 

[ManosEK9]

Hello! My engine is fully stock, but I have a chipped ecu, when I used the stock ecu, the vtec kicked in about 6000 - 6200 RPM

Now?

 

[bosniacrx]

For the vtec to engage you must have following conditions:

1. More then 4500 rpm
2. Oil presure 65 - 80 psi
3. MAP - 0hg - or 3V sending to ECU
4. TPS - Full open - 4.5V sending to ECU
5. Cooling Fluid must be warm - Working temeprature
6. Vehicle speed (VSS) must show 20 miles per hour.

You have to have oil inside, but you do not have any sensor for oil temperature. Mine rpm is a little late behing the engine. When I push throtle to end and it comes to 6000 my engine is actualy running 6200 rpm.

 

[rvm]

Now?

5800

 

[babyface]

rvm: what does the chipped ecu do? remove rev limiter and lower vtec stage?

 

[ManosEK9]

5800

You should be if it was 4500

 

[jugbugz]

generally with the stock ecu mine kicks in at 6000, seldomly under 6k and one time 6200rpm due to jerky driving on a hot day.

 

[jugbugz]

You should be if it was 4500

hahaha, no power at all there..

 

[ManosEK9]

hahaha, no power at all there..

Some misinformed people though, hear the vtec noise and they think this is beneficial and safe to drop it that low!!! Not only its useless but also very dangerous for proper vtec functioning. I believe 5000 is the lowest rpm point you can drop it(EK9) to feel the extra kick there but its still a bit low I think.
Also I realised that the more you lower vtec the more you loose at high rpm but this might be a false impression I have. Do you agree or not?
A friend of mine did this to his SiR and I believe he lost some boost in high rpm
I general, I find this mod not beneficial at all and completely unnecessary!! If you just need more torque then install some aftermarket ECU and/or cams and you get more gains that this

 

[blinx9900]

vtec crossover should be determined by cam size and fuel/ignition tuning, a lower vtec point should not affect higher rpm but it certainly does feel that way.