Fast Intakes

[r8black]

Does anyone have the fast intake fitted to the LS3 and if so does it improve performance or not worth the hassle and money, I have heard good reports about these and am looking to have it fitted to mine soon.
As I've read also that the Ls3 Heads have exceptional breathing almost compared to the LS7 heads so wondering if a value mod or not.
Stuart

[gsd2000]

My understanding is that the standard LS3 intake flows very well as standard, unless your going for a max effort setup then it might be worth it otherwise stick to standard.

Ringram will most likely know the flow rate of the intake

Edited by gsd2000 on Sunday 29th June 18:16

[KMud]

gsd2000 said:

My understanding is that the standard LS3 intake flows very well as standard, unless your going for a max effort setup then it might be worth sticking to standard.

Ringram will most likely know the flow rate of the intake

[ARAF]

From what I've gleaned, the standard intake flows approximately 300CFM, but the heads flow 335CFM, so a different intake (or a modified standard intake) should get rid of the bottleneck.

[r8black]

So I'm proberly looking at gains of approx 15 bhp
Not worth the effort I think

[ARAF]

Not if you've got half a mind to get a supercharger - though you could then sell the s/h Fast.

Also, you'll only see an increase at the top end, when the engine is trying to flow everything that it can.


FYI, the standard camshaft and valvetrain are supposed to be 285cfm, so a small increase in flow can make a big difference.

Edited by ARAF on Sunday 29th June 18:34

[SturdyHSV]

As above, only if you're chasing every horsey and money's at a surplus

If you'd had an LS2 on the other hand, that intake is piece of crap.

Apparently a ported ls3 is very close to the FAST, and considerably cheaper if you've got a dremel handy

[MyM8V8]

r8black said:

So I'm proberly looking at gains of approx 15 bhp
Not worth the effort I think

Little effort required to fit one TBH. Just whether hp gain of an intake alone for the money is worth it? You might get someone to port your LS3 intake???

[ringram]

Yeah assuming you are LS3 already just throw a small cam in. Intake is pointless without a cam anyway.
Something girly like 218/226 if you want it near stock drive ability.

Dont bother with the intake unless you are doing, heads, cam, full exhaust etc.

[ARAF]

ringram said:

Dont bother with the intake unless you are doing, heads, cam, full exhaust etc.

Engine is LS3 (IIRC) so heads are as good without spending loads, Magic put headers on, and it's just had a cam.




BTW, are my flow rate figures correct, or have I been reading BS on the internet please?

Edited by ARAF on Sunday 29th June 20:40

[ringram]

ARAF said:

Engine is LS6 (IIRC) so heads are as good without spending loads, Magic put headers on, and it's just had a cam.




BTW, are my flow rate figures correct, or have I been reading BS on the internet please?

Ah ok, in which case if its a small cam then the LS6 is fine. You would have to go heads and reasonable cam to take full advantage of a last on the LS1.
The LS3 intake of course is not an option.

Your figures sound about right to me for the LS3 top end. Should also apply equally to your L76 as in effect the parts are the same dimensions.

[jonnM]

r8black said:

So I'm proberly looking at gains of approx 15 bhp

That's a bit optimistic, probably less than 10 at the wheels.

[SturdyHSV]

For what's it's worth, seat of the pants feel, going from an LS2 to the FAST 102 made a noticeable difference from about 4k onwards (peak torque)

Just felt properly urgent, and also keener to light the tyres up. Got mine cheap though so that helped

[ARAF]

ringram said:

ARAF said:

Engine is LS6 (IIRC) so heads are as good without spending loads, Magic put headers on, and it's just had a cam.




BTW, are my flow rate figures correct, or have I been reading BS on the internet please?

Ah ok, in which case if its a small cam then the LS6 is fine. You would have to go heads and reasonable cam to take full advantage of a last on the LS1.
The LS3 intake of course is not an option.

Your figures sound about right to me for the LS3 top end. Should also apply equally to your L76 as in effect the parts are the same dimensions.

Sorry, that is a typo, LS3.

[ringram]

Shocking ARAF!

Well Id be asked what the expected power output is intended to be and what it was before and after mods?
North of 400rwhp is piss easy cam only.

Fast wont do much by itself.

[ARAF]

R8 plack has the car that we had before and after the cam for (a couple of months ago) - but both were corrected for flywheel.