CPS (Cam Profile Switching) vs VVTI vs DVVT

[GSR06]

Hi Guys,
Just wanna know if anyone had any experience on the new Proton CPS engine management?....

If compared to VVTI or DVVT, would it have any advantages or disadvantages?... how about fuel comsumption and how about the performance in terms of acceleration and top speed...?

Just share your inputs...this is an open discussion..


Cheer

 

[am_izham]

i have no experience on any of the systems you mention but then,

there's always Wiki http://en.wikipedia.org/wiki/Campro_engine#Campro_CPS_and_VIM_engine

 

[Yong_5290]

think it tis way..vvti is from toyota...how long have they been in auto-maker?
CPS...wats tat???zzzz

 

[SkYwAlKeR]

cps = mivec = vtec

vvti = dvvt = vvt

cps =/ vvti


understand??

 

[GSR06]

Guys...pls share your thoughts on my questions...

 

[JackWaiKit]

VVT is means variable valve timing...the actual function in only on the Cam gear of the inlet
DVVT means inlet & exhaust camgear will also advance after reach certain RPM
The power of example 4A series...
but not that power as i tried...

Cps is more or less same like VTEC...but not that powerful
It will give u another power or torque in the high RPM
Roughly bout 5000 to 6500RPM...
But engiine will ramp like hell...

This is based on my foreman
Correct me if i' wrong

 

[xtremeleo]

CPS isnt equal to a mivec / vtec, its just a simple cam profiler witout any valve lifting mechanism

vvti = dvvt = vti, all similar lah

 

[UDT-SB]

VVT-i...is to save fuel only...

yong 5290,
give chance to let proton prove that cps does work....ppl ask opinion not ask u to giv lame opinion or shooting blanks.....

 

[EvolutionZ]

get all 3 owners of such engines to give testimony of the engine performance, torque, fc and accelerations to conclude it.....

 

[EGNINE]

CPS isnt equal to a mivec / vtec, its just a simple cam profiler witout any valve lifting mechanism

vvti = dvvt = vti, all similar lah

proton claim it was valve lift...more confure now bout cps

 

[soulblade]

CPS isnt equal to a mivec / vtec, its just a simple cam profiler witout any valve lifting mechanism

vvti = dvvt = vti, all similar lah

actually, cps works exactly the same as vtec, which provides variable valve lift. the different is at the mechanism. the cps actuation is in the bucket tappet while the actuation of vtec is in the rocker arm. proton cps has the cps mechanism at the intake only.
cps is actually the lotus technology, which if im not mistaken, the same technology used by porsche (except the porsche also incorporates the valve timing adjuster).

vvti, dvvt varies the valve timing but not the lift, except vvtl-i which is found in toyota celica.
the vtec and cps can vary the timing a bit depending on the profile of the cam lobe.

thats all i know. please correct my mistake.

 

[GSR06]

Hi Jack, UDT-SB,
Thanks for inputing your comments and opinions and thanks also for clarifying what this thread is all about...this is a forum to share and not to 'ding' people here and there...pls give people a chance to prove their worth though.

Hi Evolution Z,
Thanks for your input and that is why I am still waiting for the appropriate owners to give his or her comments if they had any.

So now, I am getting mixed responses from other people... bottom line is, is CPS comparable to VVTI or DVVT?.... I am sure it can't be comparable to Mivec or VTEC in terms of performance though...

Just share my thoughts..

Cheers !!!

 

[EvolutionZ]

actually i've driven the campro cps neo & gen2,
the response actually not much different from the previous iafm model.
the only thing is when at rpm 4.5k to 5k, it will have a surge of power and can feel the FW pulling....greater torque at high rpm. if in technical explanation, i am not good to explain.
juz drop by any proton showroom to test drive the car.....or i can assist to arrange if u guys want to.

 

[ham_m2]

ive driven a cps gen2 bfore...The power only comes on high RPM say like 4300rpm like that...
But below that rpm,its less powerful...
Driven a Kembara DVVT before,the DVVT kick in when i press the pedal hard to the floor...It kick in around 3000...So u get the power to overtake earlier than cps...

btw,proton are only new to this kind of technology...So of course CPS arent that powerful...Give it time to proton to improve their technology....

 

[achmedrauff]

Honestly all the technologies mentioned depends on what are the requirements thus the state of programming and tuning are different for each application. For VTEC, MIVEC, VVTi and even VANOS... aftermarket tuners had years of accumulated research and experience plus all are already competition proven for performance.

I say lets give this CPS a chance with tuners and have privateer and factory teams enter it into competition to see what is the ceiling for the CPS. I have driven all sorts of cars with all sorts of technologies and trust me outright power is not what you want everyday. Reliability and consistency is far more important.

 

[EvolutionZ]

true, reliability and consistency ......coz no point inventing a car that can have all sort of technologies but end of the day laying in workshop more than we driving it...

for CPS the power comes around 4500rpm until bout 6500 to 6800rpm then u its cut off...

 

[9266]

My point of view, CPS is just a correction done by proton to improve the torque curve of their old campro engine. Have tested the Waja with CPS engine b4, quite impressive with the respond from the CPS. or i would say very-very respondsive if compare to old campro engine, which have no power/torque at lower rpm 3000-4000 rpm.

Engine roars like hell, but i like it. Feels like driving a pure racing car on the street. hehehe. For thread host, if u want to compare CPS with, VTEC kecik, yessss... CPS performanace is almost the same. ( not the one with i-vtec haaaaaaaaa) hehehhehe

Bump: My point of view, CPS is just a correction done by proton to improve the torque curve of their old campro engine. Have tested the Waja with CPS engine b4, quite impressive with the respond from the CPS. or i would say very-very respondsive if compare to old campro engine, which have no power/torque at lower rpm 3000-4000 rpm.

Engine roars like hell, but i like it. Feels like driving a pure racing car on the street. hehehe. For thread host, if u want to compare CPS with, VTEC kecik, yessss... CPS performanace is almost the same. ( not the one with i-vtec haaaaaaaaa) hehehhehe

 

[GSR06]

I fully agree that reliability and durability are the key points when a technology is tested to its limit...no point having a car which has many hp but always, 'gantung' in the workshop for repair...

I hv driven a GEN 2 with campro engine....the feel of the engine, was like really heavy when the RPM reached around >5k... of course, the sound of the engine was like screaming out loud..haha... I would say, it has a mid range torque, bad acceleration and for top end, I should say it is not bad at all since most of the times, I observed Waja and Gen 2 were always on the overtaking lanes...

Also, if we compared the performance in terms of power to weight ratio, maybe Satria Neo with Campro CPS has a better advantage though...what say you?

I am sure those high performance workshops would consider adding more horsepower to this CPS technology by all means of modifications...anyone heard of B.O.T. on CPS engine thus far?...

It is interesting to know, how well we know about our local flavor of CPS engine...what could be done to further enhance its performance to gain a respectable hp.

I am not sure how I-VTEC would perform....but the new Honda City has the highest HP in its 1.5L catergory...salute..

Hope to get more discussions on this topic...

 

[papagoines]

from what i've heard.... the CPS used now is not the full blown one... same as 9266 sez, the current CPS implementation are used to address the weakness of the current campro...

maybe the full blown one will be use in the rumored neo gti? even R3 is hinted that they are researching the full CPS capabilities...

at least what i've read in a magazine recently :hmmmm:

 

[achmedrauff]

cant agree more...

Pushing the limits of CPS from the get go would be tough and could cost a lot of damage. However it would be very interesting to see what a unichip or piggy back ecu could do to a stock CPS. Then we have R3 fettling freely coupled with the best resources to go about tweaking the daylights out of the CAMPRO+CPS block. Mind you that unlike vtec that only has variable cams CPS has variable intake as well which is very much a proven concept by BMW with their Vanos engines.

Variable Cams + Variable Intake = Possiblities?

Just hope the stock standard units are engineered to a very high treshold. Otherwise its back to the drawing board to re-engineer the innards with stronger parts.