Kmelthratter

Hello,

Noticed after a decade of ownership that lowering VTEC would increase midrange, is the car mapped for lower VTEC engagement? What is the most simple way to do this? Is it possible to have a trigger button in the cabin, or will it usually cruise on the low-cam at low load?

s2000Junky

I'm a bit unclear of the run up to your question so I will assume you are not currently lowering vtec via some device but are interested in doing so. The simplest way is to pick up a Apexi VAFC or NEO. The NEO is the preferred as it does the same basic thing as a fuel controller and vtec signal modifier, but does the vtec control with both rpm and throttle position settings to get a much closer to stock tune, vs just based on rpm such as the previous vafc models- which means your always running in vtec if you are cruising in your new lowered setting. These controllers do not effectively add fuel though, only cut it and you could be running lean in the lowered vtec range if your running a 04-05 and some breathing mods. The earler ap1 years, especially the 00-01 ran stupid rich so it only helps.

Manga_Spawn

It is not possible without some kind of tuning device like the ones Junky suggested.

zeroptzero

you can lower the vtec engagement point 500-600 rpms without any tuning on a stock setup with basic bolt-ons, you can lower it more with tuning and additional aftermarket parts (straight pipe etc). You can get more gains with some leaning out of the air-fuel mixture but you need to do some tuning to know for sure and to do it safely. Any basic vtec controller like mentioned above will work, I've been running mine for a while now and I really like it. I also prefer a smooth vtec engagement point at lower rpms rather than a harsh one at higher rpms, it helps with handling in long sweeping curves, and in wet weather conditions, smooth is better IMO.

Chuck S

My FlashPro allows me to enter the software and type in whatever RPM I want for VTEC to engage. Dirt simple! Also useless unless the fuel tables are adjusted (and I've no clue what else). This is why you need a knowledgeable tuner for the car. If what you propose was possible it would have been done 17 years ago maybe with something like a micro switch on the accelerator to trip VTEC at full throttle regardless of what the ECU wants.

If you have a 2006 or later a Gernby FlashPro tune will transform your car. Otherwise you need an aftermarket ECU. Horsepower per dollar price is much more expensive than supercharging. Per dollar.

-- Chuck