mitsubishi VTEC?
- Thread starter tcfridaydawg
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JimmyRos.
07 BMW 328Xi
AMEN TO THAT MAN! :lol:R1DC2 said:V-TEC is the *king* of Variable Valve Timing!
dc2GS-R
Super Moderator
AGREED 100%!!!aspec said:doesn't matter what the new eclipse has, it still looks like shit. i never thought it could get worse after the 00-05 models. Well, leave it to mitsu to prove me wrong. God i loved my 99 GSX... the eclipse name is tainted to me now...
For sure :lol:TurboGST said:wow... good thing us 1-2G don't have vtech. Turbo Power all the way!
Only one mod has a mitsu (speedin). I'm not a mod :lol:JDM_Conv3rsion said:but two of the mods actually own mitsu's.....
I hate to bust your bubble but BMW Valvetronic owns VTEC. It doesn't limit itself to only 2 seperate cam profiles and variable timing. It is infinitely variable for LIFT and TIMING and complete eliminates the need for a throttle body which serves the only purpose of being a restriction in the intakeR1DC2 said:V-TEC is the *king* of Variable Valve Timing!
JimmyRos.
07 BMW 328Xi
:smackself i should've known! but your knowledge in performance is way out of my league.dc2GS-R said:Only one mod has a mitsu (speedin). I'm not a mod :lol:
so im pretty sure you'll be a mod sooner or later. :lol:
JdmITRCinci
JDM Bliss
Well you know Honda didnt create vtec. Ford and chevy were tyring to develop Vtec in the 70's and Fiat was the first automotive company to perfect vtec in the early 80's. But honda has the most powerful and most effective vtec. If you look at other cars dyno statictis yoll see their vtecs dont make that much power.
03dc5Integra
New Member
hahahah it's funny how people is saying all these other company was the first to create vtec hahahaha um no HONDA did, they created "VTEC" people hahahahah everything else is just a variationg of valve variable timing technology which is not called vtec by the company that produced them. So people HONDA created VTEC and toyota created VVT-I and so forth so please do not use the term VTEC with other automotive company. O yeah GM tried to create it back in the days but like everything else they failed n HONDA dropped the 1st b16a and that thing was a hit then into the NSX baby.JdmITRCinci said:Well you know Honda didnt create vtec. Ford and chevy were tyring to develop Vtec in the 70's and Fiat was the first automotive company to perfect vtec in the early 80's. But honda has the most powerful and most effective vtec. If you look at other cars dyno statictis yoll see their vtecs dont make that much power.
g3teg97
Super Moderator
No one else had "VTEC" except for Honda. It was only patented by Honda.JdmITRCinci said:Well you know Honda didnt create vtec. Ford and chevy were tyring to develop Vtec in the 70's and Fiat was the first automotive company to perfect vtec in the early 80's. But honda has the most powerful and most effective vtec. If you look at other cars dyno statictis yoll see their vtecs dont make that much power.
Other companies had "Varible Valve Timing" such as Toyota, BMW, etc.
History:
Fiat was the first auto manufacturer to patent a functional variable valve timing system which included variable lift. Developed by Giovanni Torazza in the late 1960s, the system used hydraulic pressure to vary the fulcrum of the cam followers (US Patent 3,641,988). The hydraulic pressure changed according to engine speed and intake pressure. The typical opening variation was 37%.
In September 1975, General Motors patented a system intended to vary valve lift. GM was interested in throttling the intake valves in order to reduce emissions. This was done by minimizing the amount of lift at low load to keep the intake velocity higher, thereby atomizing the intake charge. GM encountered problems running at very low lift, and abandoned the project.
Alfa Romeo was the first manufacturer to use a variable valve timing system in production cars (US Patent 4,231,330). The 1980 Alfa Romeo Spider 2.0 L had a mechanical VVT system in Spica fuel injected cars sold in the USA. Later this was also used in the 1983 Alfetta 2.0 Quadrifoglio Oro models as well as other cars.
In 1986, Nissan developed their own form of VVT with the VG30DE(TT) engine for their Mid-4 Concept. Nissan chose to focus their NVCS (Nissan Valve-Timing Control System) mainly at low and medium speed torque production because the vast majority of the time, engine RPMs will not be at extremely high speeds. The NVCS system can produce both a smooth idle, and high amounts of low and medium speed torque. Although it can help a little at the top-end also, the main focus of the system is low and medium range torque production. The VG30DE engine was first used in the 300ZX (Z31) 300ZR model in 1987, this was the first production car to use electronically controlled VVT technology.
The next step was taken in 1989 by Honda with the VTEC system. Honda had started production of a system that gives an engine the ability to operate on two completely different cam profiles, eliminating a major compromise in engine design. One profile designed to operate the valves at low engine speeds provides good road manners, low fuel consumption and low emissions output. The second is a high lift, long duration profile and comes into operation at high engine speeds to provide an increase in power output. The VTEC system was also further developed to provide other functions in engines designed primarily for low fuel consumption. The first VTEC engine Honda produced was the B16A which was installed in the Integra/CRX/Civic hatchback available in Japan and Europe. In 1991 the Acura/Honda NSX powered by the C30A became the first VTEC equipped vehicle available in the US. VTEC can be considered the first "cam switching" system and is also one of only a few currently in production.
In 1991, Clemson University researchers patented the Clemson Camshaft which was designed to provide continuously variable valve timing independently for both the intake and exhaust valves on a single camshaft assembly. This ability makes it suitable for both pushrod and overhead cam engine applications.[1]
In 1992 BMW introduced the VANOS system. Like the Nissan NVCS system it could provide timing variation for the intake cam in steps (or phases), the VANOS system differed in that it could provide one additional step for a total of three. Then in 1998 the Double Vanos system was introduced which significantly enhances emission management, increases output and torque, and offers better idling quality and fuel economy. Double Vanos was the first system which could provide electronically controlled, continuous timing variation for both the intake and exhaust valves. In 2001 BMW introduced the Valvetronic system. The Valvetronic system is unique in that it can continuously vary intake valve lift, in addition to timing for both the intake and exhaust valves. The precise control the system has over the intake valves allows for the intake charge to be controlled entirely by the intake valves, eliminating the need for a throttle valve and greatly reducing pumping loss. The reduction of pumping loss accounts for a 10% increase in power output and fuel economy.
Ford became the first manufacturer to use variable valve timing in a pickup-truck, with the top-selling Ford F-series in the 2004 model year. The engine used was the 5.4L 3-valve Triton.
In 2005 General Motors offered the first Variable Valve timing system for I-head V6 engines, LZE and LZ4.
Src: http://en.wikipedia.org/wiki/Variable_valve_timing
ddawgs2000
New Member
damn now thats a history lesson. good read. good find.
brandon mitchel
Banned
Do you guys know where to get good mitsubishi parts? I'm looking for a replacement part and still no results. Thanks.
mirrorimg
Well-Known Member
Figured I would quote it for more visibility.The goal of VTEC:
To combine fuel efficiency and greater HP output from a small displacement engine, that's about it.
I agree VTEC is overhyped, mostly by people who don't know what it VTEC is, and also by haters who just want to trash it and they by the guys who want to defend it when neither know exactly what it is.
A variable valve timing engine was attempted by GM back in the 60's, but they couldn't make it work reliably. Honda was the first to offer a variable valve timing engine to the public in a mass produced car. First in the NSX, and then in the 1992 GSR.
VTEC is what it is, it's a good thing to have, I'm glad I have it rather than not, my favorite color is blue and the Yankees suck. Life goes on...
Small lobes on the cam for daily driving/fuel efficiency, larger lobes for more power. Thats all VTEC is. The benefit of a VTEC motor over non-VTEC is that the head flows better, the components in the head were designed better in terms of strength, and the fact that it helps with fuel economy and you dont have a horrible lopey idle.
TheNailGuy
Yes im a NailTech
Well...In all honesty i didnt know what VTEC really was, but now i do lol Thanks for the learning lesson!