Reply to thread

See what others are reading now! Try Forums > Current Activity

Message: <blockquote data-quote="Fluffy" data-source="post: 1767242" data-attributes="member: 12697">i dont think rsm have vtec control.apex have their own vtec controller.----------------------------------------------------VTEC ControllersA few people have asked what VTEC controllers are, and how they affect the engine. A VTEC controller is basically just a RPM activated switch that connects to the VTEC control valve and switches cams at a pre-determined engine speed, rather than letting the ECU figure things out. I have reverse engineered a commercial VTEC controller to see how one works, and found that they also look at the oil pressure and water temperature sensors like the ECU normally does, so that the cams are not switched if something is wrong. I have heard of people using an off the shaft rpm switch as a VTEC controller.VTEC controllers are useful if the engine has been modified, and the ECU switches cams too early/too late, and for certain engines where Honda has got the cam switch point wrong. The only example of this that I know is the VTEC prelude, which has a huge jump in the torque curve because the cams are switched too late. Rumour has it that Honda did this deliberately to get a good EPA gas mileage, but there definitely are benefits from getting the prelude to switch cams earlier.With the stock B16 engine this is little to be gained from changing the cam switch point - the ECU does a much better job than a VTEC controller because it can compare the torque curves of each cam and switch where they overlap. If you need a VTEC controller then it will be evident from a jump (up or down) in the torque curve when the cams switch. This may be difficult to judge even from a dyno because the cams should switch at different speeds with different engine loads, but a dyno print out would be the way to check.-just extra info.</blockquote>

Verification

The Marketplace Latest

original rare Rays Volk Racing ZE40 17x9jj offset...
- Started by david tao
- Chassis and Wheels
original rare Rays Volk Racing INGS TS06 18x8jj...
- Started by david tao
- Chassis and Wheels
New original Defi Advance A1 NA package triple...
- Started by david tao
- Engine and Performance
original rare Rays Volk Racing CE28 16x7jj offset...
- Started by david tao
- Chassis and Wheels
Honda Jazz/Fit JSracing GTwing Spoiler
- Started by jeff6126
- Exterior and Body
Toyota Vios NCP93 front bonnet hood
- Started by jeff6126
- Exterior and Body
Honda civic fc varis spoiler
- Started by jeff6126
- Exterior and Body
BMW F10 Msport front bumper set
- Started by jeff6126
- Exterior and Body
BMW F30 M3/GTS front bonnet hood
- Started by jeff6126
- Exterior and Body
BMW F10 vorsteiner rear bumper diffuser
- Started by jeff6126
- Exterior and Body

Posts refresh every 5 minutes

Murcielago Involved in Yet Another Superbike Showroom Crash

https://www.zerotohundred.com/wp-content/uploads/2012/07/murciecrash_1.jpg

Remember the incident earlier this year in Cheras where a woman went panicking after crashing into a few cars which includes an XC60 before...

Next Generation Evo gonna be hybrid?

http://www.autocar.co.uk/News/NewsArticle/AllCars/259686/

http://cdn.images.autocar.co.uk/612x408FFFFFFF/Car/Mitsubishi/Mitsubishi-20101111244503181600x1060.jpg

The next Mitsubishi Evo will be powered by a hybrid...

More Shots of the Carpark at Ferrari Challenge Trofeo Pirelli Sepang