Question for the DTA boys

[B20GT]

How does it engage the V Tec?

By wiring the vtec solenoid to the aux2 output, and set it at a specific rpm number to engage as desired.

[BassAddict]

Just out of interest, can the DTA cope with connecting directly to the vtec solenoid or does it need a relay ?
Regard,
Richard

Through a relay..sorry..forgot to mention that.. :oops: Same kind as used for the ecu power circuit..

[BassAddict]

Thanks ! No where near that stage yet - but nothing wrong with foreward planning !!! :)
Rich

[JoeT]

Am I right in thinking that it's not advisable to adjust the vtec point more than about 500rpm either way from standard? as the cams are made in a very specific way so that they are designed to run at very specific rpms, and anymore could be dangerous?

As far as I have learned according to different forums and other sources, it seems like it doesn`t damage the engine by lowering the rpm engagement point. It only alters the power curve accordingly. Depending on how low you set it of course. But you can`t lower it too lets say 1000 rpm or even 500 for that matter, because then it would be engaged all the time and increase the wear of the engine dramatically! You can look at the vtec system as a 4 cam setup..first you have two (one exhaust and one intake) mild cams for everyday use, and when stepping on the pedal a second set of aggressive cams shows up. Thus the power increases and also wear and lower mileage. You don`t get anything for free in this world :wink:

It seems like the commonly accepted engagement point for optimal performance is in the 4000 to 4500 rpm range. People who set it lower has reported a stronger mid-range but lost the top end power greatly and made it doze off earlier..If you want to make it as healthy as possible for the engine, you shouldn`t use the vtec at all, because it does wear the engine out a bit more, but not much. So a reasonable point to set it would be anywhere from 4000-6000. Depending on needs and demands..The OEM one is set at 5500 I believe. On the Honda ECU you also have some additional parameters which needs to be fullfilled before engaging the vtec. I think those were: Engine temperature above a certain level, sufficient oil-pressure, a certain speed on the wheels, I believe it`s about 60kmh or so..And last but not least, rpm. When all this is fullfilled, the vtec engages. Hope this clarified a bit! :)

Best regards
Chris!

[B20GT]

SpoonSports have taylored V Tec controllers for all V Tec hondas, They allow in car adjustment between 3-8.5K. APEXi also have one which is plugged to the OEM ECU, This allows you to adjust the car whilst in motion, and was developed to allow spoon to dominate the standard car touring series in japan, another reason why not to fit DTA IMHO, Scott G

[duck]

Can anyone verify that the Honda ECU needs 60kmh before the VTEC can engage, this seems high as you would not get the VTEC working in first gear :?

[duck]

I have posted a question on the HondaRevolutions forum about the speed needed for the Honda ECU to engage the VTEC and it appears to be 18mph for a CRX.

DTA....Honda ECU who cares as long as it's a 16v mini, I'll be happy with either as long as it works :P