is it possible to adjust vtec engagement?

**teggiboy** · 01-07-2006 02:29 PM

Hi there....

I've got a dc2r and as you guys know, vtec comes in fairly late at 5700rpm. Just wondering if there is any way to adjust this so it comes in earlier, eg 4000rpm. I know there are products such as vtec controllers to adjust it, but does that really make a difference? Vtec controllers basically tell the ecu to work a little differently, but if the hardware, eg cams are not designed to engage at that rpm, how can that work?

If anyone has got a similar setup to what i'm after, eg vtec @ 4000rpm, please let me know...thanks

**vtec_jet** · 01-07-2006 02:47 PM

why would u want to change the engagment of vtec anyway ?? dont you trust honda engineers? i really think its a bad idea IMO ..

**teggiboy** · 01-07-2006 02:53 PM

i'm just curious.... because I used to drive a 180sx and the turbo kicks in at 3000rpm.... now drive a dc2r, 5700rpm seems very late.... it would be nice if it kicked in much earlier

**bennjamin** · 01-07-2006 02:54 PM

you can , with a aftermarket ECU or piggy back computer. But unless the engine is moddified for this change in "engagement" why bother ?
As mentioned , Honda engineers developed the VTEC crossover at that exact point for a specific reason...leave it be.

**Menthu Rae** · 01-07-2006 03:42 PM

Originally Posted by teggiboy

i'm just curious.... because I used to drive a 180sx and the turbo kicks in at 3000rpm.... now drive a dc2r, 5700rpm seems very late.... it would be nice if it kicked in much earlier

Welcome to the world of highly tuned NA's - where peak power is near the rev-limit and peak torque is near VTEC engagement point. Very different power delivery from turbo as you've noticed - you don't like the VTEC engagement - but it's set at that point to match the car.

You're in an R... so my suggestion - don't touch it - unless you know what you're doing. Chances are, you'll lose power.

Understand the car, and change your driving style accordingly - and you'll be rewarded

**teggiboy** · 01-07-2006 03:52 PM

thanks for the feedback guys.... i agree... if honda designed this machine to have vtec come in at 5700rpm for optimal performance, then best not to touch it

**hondasaurus** · 28-09-2006 10:59 PM

If your engines stock, you don't need one.

**saxman** · 29-09-2006 07:55 AM

understand that lowering vtec like you want to will cause a SIGNIFICANT loss of power. The engagement occurs where one cam becomes more efficient than the other. It's not like the car makes more power with vtec engaged, and it's just held off for economy purposes.

**Q_ball** · 29-09-2006 09:05 AM

Yeh, unless modded, leave it as is.
VTEC isnt like a turbo spool where the lower it "kicks in" the better.
Jst search round the Integra and the Noob forum for related threads and you'll get a better understanding of the matter

**czy_sol87** · 30-09-2006 06:23 PM

just curious but is there a time where u would ever lower ur vtec point, i dont think so?, i know of ppl making the engines rev to 10k, but in that case u would increase rpm which vtec kicks in, cause vtec is only efficent for a certain amount of rpm

**aaronng** · 30-09-2006 09:13 PM

Originally Posted by czy_sol87

just curious but is there a time where u would ever lower ur vtec point, i dont think so?, i know of ppl making the engines rev to 10k, but in that case u would increase rpm which vtec kicks in, cause vtec is only efficent for a certain amount of rpm

It doesn't work that way. Read up on what vtec really is and you'll understand why.