cam shaft?

[superlara]

wondering if any of you guys know where i can get an aftermarket camshaft? seen a celica and a spec-v with hks cam shafts and wow it made a difference on their car. and the best thing is they told me replacing the cam shafts would not set off the engine warning light. hopefully thats true.

so can anyone help?

[Sebas007]

Consider the VVT-i controler...

[Jackass-Jeff]

Agreed. VVT-i controller from CAMCON is a lot beter than cams for the VVT-i units. Do they even make 3.3L 3MZ camshafts? =P

Let me know if you want the VVT-i controller. I can get them for a pretty good price.

[Midias]

when I could not find a replacement for my accord I contacted the people at www.coltcams.com for a regrind. They may be able to help you too.

[superlara]

now what exactly does this vvti controller do? i see its only about 330...

nvm...i get the idea of it...

pretty nice piece of equipment but u kno anyone that has it yet?

[Biggi_e]

what kind of power will it increase on our solara? im not too familiar with camshaft work

[Wang2k]

cams open and close the valves. the difference between stock and aftermarket cams is the amount of lift(how far the valve is opened) and duration(how long) there are other variables such as lobe separation(just what it sounds like) and the type of ramp used on the lobe(it can open slowly and hold peak lift for a short time, or just ramp the valve open and hold it at or around peak lift longer) all these things working together help determine the character of an engine. on older engine the factory used tame cam specs to create great off the line power and efficiency. That left alot of room for hp improvements, especially when the other restrictive factory items were removed. on a small block chevy you can gain about 30-40 horses just by swapping out the stock cam(if you have headers and a nice intake manifold already) but if you have a good set of heads on that chevy you can easily pick up 100 horses. Note though that the stock cam may only make power to 4000rpms, the new lumpy one pulls to 6500.



Now lets cross reference that info to our platform. We use small displacement engines that already benefit from free flowing intakes and exhaust, and along with 4 valves per cylinder our engines are pretty much like a race engine(lol). the cam specs for our engines are made to breath on the top end(upper rpms) and can easily pull 6500rpms if there was no rev limiter. What does all this bull ive been typing mean? Our cars have relatively hot cams, intake, exhaust, and heads from the factory that leaves almost no room for improvement. i could see like a 10 horse gain out of swapping all 4 cams, after lots and lots of R&D to get the specs right.

sorry for the book

[Sebas007]

It is the controller that open intake valves and exhaust valves. Just take a look to this you'll learn a lot in short time !!! An agressive camshaft will offer better performance at high RPM because it can open sooner and close later for the intake valve.

what kind of power will it increase on our solara? im not too familiar with camshaft work

Camshaft
http://auto.howstuffworks.com/camshaft.htm
http://www.compcams.com/information/tutorials/
http://www.ul.ie/~kirwanp/animationofthefullmechanism.htm


Engine (look the little blue almost circle shape...it is the camshaft)
http://auto.howstuffworks.com/engine.htm

Sequential Tranny
http://auto.howstuffworks.com/sequential-gearbox.htm

DOHC
http://auto.howstuffworks.com/question562.htm

[Down2TheC]

...sorry for the book

Damn good book. Fine explanation. How about a VVt-i 101? That just advances or retards the spark timing depending on a bunch of inputs, right? I'm guessing RPM, Torque maybe, driving history (the learning crap), certainly gear, speed, Throttle Pos, and maybe a/f ratio. Makes for the most efficient or powerful burn depending on how they programmed it. (lets face it... Toyota would program for the efficiency/reliability before power.)

[MikeATL]

you learn something new every day.

[Sebas007]

VVT-i VS VTEC link
http://www.billzilla.org/vvtvtec.htm


BTW

VVT-i + turbo

http://www.clublexus.com/forums/archive/index.php/t-26479.html

[Wang2k]

the timing part of vtec isnt refering to spark timing, but rather valve timing. the cam on an engine with continously variable timing adjusts the centerline of the cam a few degrees to improve low end power(by advancing the cam slightly) while also improving mid and upper rpm power by optimizing cam phasing at those rpms(hence continiously adjustable.

the variable lift function i dont think is continous, but rather an abrupt change of lobes to a more aggressive profile at a set rpm. if there is actually contiously variable lift on an engine, it most likely works by increasing or decreasing lifter preload, which would make the valve open or close more.

[NeFaRiOuS_SLE]

Also, another piece of trivia: VVT-i has got even i-VTEC beat, since VVT-i (and even Nissan's C-VCTS) are continuously variable, but i-VTEC only has 6 preset configurations.

[XEusioN]

...sorry for the book

Damn good book. Fine explanation. How about a VVt-i 101? That just advances or retards the spark timing depending on a bunch of inputs, right? I'm guessing RPM, Torque maybe, driving history (the learning crap), certainly gear, speed, Throttle Pos, and maybe a/f ratio. Makes for the most efficient or powerful burn depending on how they programmed it. (lets face it... Toyota would program for the efficiency/reliability before power.)

Actually the VVT-i phases (advance/retard) the cam timing not the ignition timing.

And the thing that VVT-i lacks over i-VTEC/VTEC is variable lift. The only Toyota engine that had that was the Celica GT-S and it's VVTL-i engine.

The variable lift is what makes the high strung dohc vtec honda engines start screaming at the changeover (3500-6500rpms)