Lumpy cams but keeping vvti

[barryogen]

I have some cash to spare, and am looking at the japanese TRD site and came across these fullas.

http://trdparts.jp/english/parts_engine-3s-ge.html

Camshaft, intake 13501-TF130 Ｃ 1 65, 000 For operative VVT-i Angle 280° Lifting 12.2

Camshaft, exhaust 13502-TF130 Ｃ 1 65, 000 For operative VVT-i Angle 280° Lifting 12.0

Anyone know whether these will kill drivability too much when compared to the stock cams?

[Mr Revhead]

It's required to make enough space on cylinder head for cam operating correctly.

you may need to do some machining
and some form of tunable ECU would be a goer

[rollaholic]

thats some pretty aggressive numbers!

[RomanV]

thats some pretty aggressive numbers!

Enough about the price, what about the spec of the cams?

[Lloyd]

Mmmm.... no torque under 5k. You sure you want that kinda engine on a street car?

[Mr Revhead]

Mmmm.... no torque under 5k. You sure you want that kinda engine on a street car?

hows that different from stock?

[Lloyd]

Heh, fair point. Just going to make it a lot more obvious I guess. Pretty big difference in compression ratios on those 2 dyno runs, obviously to make the most from the cams. I wouldn't have thought it would make for a nice road car, maybe in Chch with no hills it would be alright

[nz_climber]

Talk to RA45 on here, he knows alot the beams 3sge, and would be able to comment on the cam specs, and weather they are suitable for everyday use.

http://forums.toyspeed.org.nz/viewtopic.php?t=62952&highlight= gives a little bit of on factory cam specs and toda cams so give you something to compare to.

[AceSniper]

just do-it
I think there to small
but if you want vvti guess that's your option
not 100% sure but I think you will still be left with enough power capable of street driving, but will need ecu. 13.5:1 I think thats abit steep? Id be thinking 12.8

[rollaholic]

13.5:1 is pretty high for something you'd want to be running on pump gas!

[barryogen]

the car has a power FC, so tuning would be a matter of another $800+ ish or so.

From reading of others that that done this, some head work(internal grinding) is needed, not to mention a port and polish to make it breath enough to keep up with the cams.

Might be a bit more expensive once all that is done... and yeah, nothing under 5k would suck even compared to the stock engine that has not a lot under 5k.

Thanks guys.

[RedMist]

The ramp to ramp figures aren't that bad. Pretty agressive but not full race. Its the lift that worries me. Smallish duration with very big lift means you'll need some bloody strong springs to keep the bucket on the lobe.
You'll also want to look at your dynamic compression. With bigger duration dynamic compression drops and as such you'll loose horsepower without a suitable increase in static compression.
With cams of that nature you'll also have to have a very good look at your exhaust and intake (ram tubes) any minor hinderance to such big valve open times will drop huge figures off your power curve.
Polish is dead. Everyone is striving for a boundary layer now. Porting... I probably wouldnt go down that route either. In some instances they head developers fill ports (much as my old 4age was). Flow benching is the only way to tell which way to head.

Rather than pick on a single component, why not choose a HP figure and build the engine around that goal (keeping in mind attempts to keep as much torque mid end as possible)

[Celica RA45]

the cams will fit on the head ok .no machining needed for the 280 profile
on vvti you cant use it as you will smash the valves into pistons
and you will need valve springs as well
on vvti as you go up in lift and duration you cant move the cams as much .the vvti controllers need to be modifyed so they cant move as much like in std form
so from 26 cam back to about 12 cam
i use my own profile from billetts and these are 503 thou just under 13mm of lift and i modify the cam controllers as well and i supply good quality german valve springs for these motors

[barryogen]

wow, handy to know, thanks.