Reply to thread

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

Message: <blockquote data-quote="stimGILER" data-source="post: 922849" data-attributes="member: 18632">3-stage VTECExamine the SOHC VTEC and SOHC VTEC-E implementations. The clever Honda engineers saw that it is a logical step to merge the two implementations into one. This is in essence the 3-stage VTEC implementation. 3-stage VTEC is implemented on the D15B 1.5l SOHC engine in which the VTEC-E mechanism is combined with the power VTEC mechanism. Many of us probably has laughed at the poor ignorant layman who said "I want power AND economy from my Honda". We know of course that power and economy are mutually exclusive implementations. Honda decided not to abide by this rule. Now, with 3-stage VTEC, we get BOTH power and economy !. The diagram below illustrates the 3-stage VTEC implementation. The intake rocker arms have two VTEC pin actuation mechanisms. The VTEC-E actuation assembly is located above the camshaft while the VTEC (power) actuation assembly is the standard wild-cam lobe and rocker assembly. Below 2500rpm and with gentle accelerator pressure, neither pin gets actuated. The engine operates in 12V mode with very good fuel combustion efficiency. When the right foot gets more urgent and/or above 2500rpm, the upper pin gets actuated. This is the VTEC-E mechanism at work and the engine effectively enters into the '2nd stage'. Now D15B 3-stage works in 16V mode (both intake valves works from the same mild cam-lobe). Stage 2 operates from around 2500rpm to 6000rpm. When the rpm exceeds 6000rpm, the VTEC mechanism activates the wild cam-lobe pushing the engine into the '3rd stage', the power stage. Now the engine gives us the full benefit of its 130ps potential ! The 3-stage VTEC D15B engine is used on the current EK-series JDM Civic/Civic Ferio VTi/Vi together with Honda's new Multimatic CVT transmission. Stage-1 12V or "lean-burn" operation mode is indicated to the driver by an LED on the dashboard. The 2500rpm cutover from lean-burn to normal 16V operation in fact varies according to load and driver requirements. With gentle driving, lean-burn can operate up to 3000rpm or higher. Stage-3 may not always be activated. The Multimatic transmission has a selector for Economy, Drive, and Sports mode. In Economy mode for eg, the ECU operates with a max rpm of around 4800rpm even at Wide-Open-Throttle positions. The essence of 3-stage VTEC is power AND economy implemented on a 1.5l SOHC PGM-Fi engine. Many people mistakes 3-stage VTEC as a "superior" evolution of the power oriented DOHC VTEC implementation, describing DOHC VTEC as "the older 2-stage VTEC" and implying an inferior relationship. This is totally wrong because DOHC VTEC is tuned purely for high specific output and sports/racing requirements. 3-stage VTEC is in truth an evolution of SOHC VTEC and VTEC-E, merging the two implementations into one</blockquote>

Verification

The Marketplace Latest

original rare Black Racing Pro N1 16x6.5jj offset...
- Started by david tao
- Chassis and Wheels
original rare Rays Volk Racing TE37SL Black Edition...
- Started by david tao
- Chassis and Wheels
Honda city JSracing gtwing spoiler
- Started by jeff6126
- Exterior and Body
Honda civic fd ~car spray(Ferrari red)
- Started by jeff6126
- Exterior and Body
Honda jazz fit gk flrs body kit
- Started by jeff6126
- Exterior and Body
BMW F10 ~M5 front skirt lip with glossy black
- Started by jeff6126
- Exterior and Body
Kia Forte gtwing spoiler
- Started by jeff6126
- Exterior and Body
BMW F30 M3 front skirt lip
- Started by jeff6126
- Exterior and Body
Proton Saga VVT Evo Front Bonnet Hood
- Started by jeff6126
- Exterior and Body
Perodua bezza gear up body kit/spoiler
- Started by jeff6126
- Exterior and Body

Posts refresh every 5 minutes

WTA: lancer mx install FTO halfcut

just asking anyone been install FTO halfcut manual (200hp) to lancer mx? and is that good enough compare to 4G93/T? Im planning to get FTO to my lancer, coz bugget for 2.0 mah...anything else i need to...

<WTS> TRD T3 RIMS + Brand new Toyo T1-R 235/45R17

bros,

anyone interested? :-)

http://www.zerotohundred.com/newforums/chassis-and-wheels/160843-wts-trd-t3-rims-brand-new-toyo-t1-r-235-45r17.html

Garrett GT2835

hi, anyone tried this turbo before or heard anything about it ?

anyway, i just bought this item online, anyone know how to see whether it is a real GT2835 ? below are the specs and pics.

Specs are listed by seller...