Performance cams for 2 litre GT

[PHAT GT]

Fuck I love your work Mick, drunk or not.

Let's talk more about these when I see you next.

Mick

Sorry Mick i think i just hammered your thread/???

[dr20t]

Yeah it was bound to get hammerred.

Just pay me back by throwing in a few goodies when my cars there next week I won't mind

[Rome_BRZ]

I think PHAT is drunk!
Taking a page or 50 from my book

no as im still spelling words right.....i think???

but i can crack open a bottle of JD

i have 3 liberty's here , 1 QLD ,1 ACT and a SYD lib so i must be doing somthing right

You never told me you were a JD drinker! I knew we'd have something in common

[kiahatsiu]

Well, it has been about one week since I undertook any modification to my Liberty, so I guess it is time to start looking at cams. As it sits the setup comes on well at around 3.5k, but seems to run out stomp up top. So, I am thinking a set of 264ish 10.somethingish cams, some ID1000s and another day on the dyno might be the go.

Phat, or anyone who is in the know, do the liberty motors have smaller cams than the the wrxs with the same/similar engines?

[dr20t]

Well, it has been about one week since I undertook any modification to my Liberty, so I guess it is time to start looking at cams. As it sits the setup comes on well at around 3.5k, but seems to run out stomp up top. So, I am thinking a set of 264ish 10.somethingish cams, some ID1000s and another day on the dyno might be the go.

Phat, or anyone who is in the know, do the liberty motors have smaller cams than the the wrxs with the same/similar engines?

Yes - smaller lift albeit longer duration to suit the lower peak torque and the dual avcs means a leas aggressive cam profile is used to scavenge as much bottom end rev range efficiency as possible.

One thing to remember with cams is the overall benefit to the motor ( to a point).

When overlap is introduced, and a higher lift is used at the same time, the effective dynamic compression ratio reduces. For example, a cam with say 300thou lift at 0.50" and say overlap of 8 degrees, on a motor with static compression of 9.5:1, would have a dynamic compression ratio at peak excursion of about 9.2:1.

This is due to some of the compressed mixture on compression stroke being reduced slightly as the exhaust valves start to open and assist with the venturi effect to raise volumetric efficiency. This is especially so at higher rev ranges where the motor is choked.

So such an environment allows for greater boost and or timing, which has a compounding positive effect on performance.

But to answer the question yes libs have aller cam profiles than wrexes

Mick

[senator]

Well, it has been about one week since I undertook any modification to my Liberty, so I guess it is time to start looking at cams. As it sits the setup comes on well at around 3.5k, but seems to run out stomp up top. So, I am thinking a set of 264ish 10.somethingish cams, some ID1000s and another day on the dyno might be the go.

Phat, or anyone who is in the know, do the liberty motors have smaller cams than the the wrxs with the same/similar engines?

Yes - smaller lift albeit longer duration to suit the lower peak torque and the dual avcs means a leas aggressive cam profile is used to scavenge as much bottom end rev range efficiency as possible.

One thing to remember with cams is the overall benefit to the motor ( to a point).

When overlap is introduced, and a higher lift is used at the same time, the effective dynamic compression ratio reduces. For example, a cam with say 300thou lift at 0.50" and say overlap of 8 degrees, on a motor with static compression of 9.5:1, would have a dynamic compression ratio at peak excursion of about 9.2:1.

This is due to some of the compressed mixture on compression stroke being reduced slightly as the exhaust valves start to open and assist with the venturi effect to raise volumetric efficiency. This is especially so at higher rev ranges where the motor is choked.

So such an environment allows for greater boost and or timing, which has a compounding positive effect on performance.

But to answer the question yes libs have aller cam profiles than wrexes

Mick

You would also need the heads ported to get the full advantage of such are cam

Mick, it’s an endless cycle ……….. next will be a stronger bottom end for even MORE POWER

[dr20t]

It sure is Tony.

This car as I said to you was meant to be a downgrade so as to save some cash. Pfft what a lie that turned out to be.

Problem is once the heads and bottom end are done, everything else needs to be supersized to take advantage of that potential according to our messed up minds!

[Gambit]

And down the rabbit hole we fall

[coyote]

Didn't see this thread before.

There are soooo many other things you do to these engines before changing the cams.

Mick, you must be made of money. Go back and see Pulse, that's something they CAN fix.

[kiahatsiu]

And down the rabbit hole we fall

Not my first rodeo cowboy.
I am thinking cams next and another tune, and a new fuel system and some ID1000s with corn juice a little down the track. And to start building a 2.5 bottom end in my spare time, you know, just in case.
As it sits now with the vf34 the car is a somewhat inhibited up top, making 180kw @ 5500 rpm, so i am thinking some mildish cams may be the answer. I had been hoping for more power, but it is fun to drive around corners like this. So, as i see it, I can do a little more work, or take it to another tuner with a pulsating dyno.

Off to do some internet research. Those Jun 260s on page one sound useful though.

[PHAT GT]

And down the rabbit hole we fall

Not my first rodeo cowboy.
I am thinking cams next and another tune, and a new fuel system and some ID1000s with corn juice a little down the track. And to start building a 2.5 bottom end in my spare time, you know, just in case.
As it sits now with the vf34 the car is a somewhat inhibited up top, making 180kw @ 5500 rpm, so i am thinking some mildish cams may be the answer. I had been hoping for more power, but it is fun to drive around corners like this. So, as i see it, I can do a little more work, or take it to another tuner with a pulsating dyno.

Off to do some internet research. Those Jun 260s on page one sound useful though.

for the price of removing the engine to fit the cams and bucket setting you would be better off changing the turbo to a bigger one which would leave you some $$$ in your pocket. a unopened 2.0Gt lib engine is good for 240-250wkw with the right turbo and other bolt ons. Once at this level a set of cams,pistons and fresh set of bearing will be needed to go any further at a minimun

so to wrap up cams with the power your at is a waste of money

[kiahatsiu]

Mr GT, thankyou for that.
Hmm. A rethink is required here. Maybe a pulse tune .

[PHAT GT]

Maybe a pulse tune

than you wont need to spend any more money to get 3000wkw ............ besides the $1300+ you get raped when you walk in the door ..OH and the money lost by not going to work when you have to go back 3 more times to get the tune fixed

[kiahatsiu]

3000kw for 1400 is outstanding value.

[dr20t]

Just trade your car in for a washing machine it's better value and usage.