Underdriven pully kits

[VX SS 340 HP]

Just wondering if anyone new anything about them or has one on there LS1...What are price like on the kits

[helicraze]

I really don't think they are needed unless your car is revving fairly high most of the time

[HRT 666]

Cost Is around $300

[soop]

Benifits????

[BradSV8]

My personal opinion is they are not worth it unless you are fitting a cam. The power difference you will not notice only about 2-3 rwkw.

[GenReaper]

My personal opinion is they are not worth it unless you are fitting a cam. The power difference you will not notice only about 2-3 rwkw.

I only fitted one cause i dont trust the stock one

[soop]

Why do they make more of a difference with a cam?

[GenReaper]

Cause stock engines wont rev to 7,000rpm where the accesories take power out of the engine due to higher rpm and loading.
As accesories do a much higher RPM due to pulley gearing.

[soop]

ahh fair enough.
So basically no point on a road car at all then. Because at 7000rpm in first gear you're going to fast anyway...

[BradSV8]

ahh fair enough.
So basically no point on a road car at all then. Because at 7000rpm in first gear you're going to fast anyway...

No speed limits on a track.

[soop]

That's why I said on a road car...
It's not something you'll notice everyday. So why spend the coin on it.

[BradSV8]

As I said its a waste of time unless you are fitting a cam cause the balancer has to come off anyway....

[HRT 666]

To many people are only thinking of the 3rwkws you will gain but what about the other components that will now last a bit longer as they are now turning 25% slower like the power steer pump, alternator, water pump, dont you think these parts will now have an easier life?
Worth it for the $300ish I say.

[GenReaper]

To many people are only thinking of the 3rwkws you will gain but what about the other components that will now last a bit longer as they are now turning 25% slower like the power steer pump, alternator, water pump, dont you think these parts will now have an easier life?
Worth it for the $300ish I say.

He He, if i was worried about that ide be driving a Prius.

[BradSV8]

You make a good point Steve but if you dont put a cam in chances are that you are not going to be reving the car that hard anyway. I reckon Holden/GM would have done a lot of testing to ensure the water pump etc etc would be up to the task in factory trim. I still do not think it is worth it unless you are doing a cam due to the parts and labour cost to fit the balancer for no real gain.

[soop]

Wouldn't it put more load on them things at low RPM because they're spinning slower, so you're essentially going to be forcing the issue (PS pump).

[SIG-054]

well if your putting a cam in, your bumping up the idle speed anyways, so the accessories will be spinning no slower than usual at idle.

[HRT 666]

You make a good point Steve but if you dont put a cam in chances are that you are not going to be reving the car that hard anyway. I reckon Holden/GM would have done a lot of testing to ensure the water pump etc etc would be up to the task in factory trim. I still do not think it is worth it unless you are doing a cam due to the parts and labour cost to fit the balancer for no real gain.

Yes I take it for granted that the car would be at least be cammed.

[VX SS 340 HP]

Thanks for the insights and point of views i think i will give it a miss for now as i am planing a cam upgrade in the near future...i might look at doing it at the same time....THANKS