Stillen Underdrive Pulley - Review/Pics/Dyno/Vid

semtex

I'm not seeing the connection. What does a UD pulley have to do with oil temps?

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316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

wstar

He might be thinking the water pump is belt driven for some reason. I can't recall any car I've owned where that was the case (including the new Z), but I suppose some car must be set up that way.

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ZKindaGuy

Yes I wasn't aware that the water pump on the Z is electric (I assume then?).

It isn't that "some car must be set up that way". Many cars are still set up with the serpintine belt driving the waterpump. That is why I asked the question. Putting UD's on a car using a belt driven waterpump, the pump turns much less than with the stock pullies on the car. So the cycling of water is much less.

Higher temps is something a person running UD's on a belt driven waterpump always has to keep in mind particularly if the owner decides to put a blower on a car after installing UD pullies on a car that has a belt driven waterpump.

1slow370

ok the water pump is driven by the timing set(chains)

the power brakes run on engine vacuum

Why not make a pulley for the supercharger kit that overspins the blower to work with the underdriven crank?

Is the rubber harmonic section on the stock crank pulley just there for show?

Does a brother have to kill to get a timing scale instead of three stupid dimples?

How accurately is the zero timing mark located in relation to TDC (like less than a degree?)

ZKindaGuy

And the overspinning of the blower would just generate a ton of additional heat on top of what a blower would generate without the overspin. So why make a pulley to overspin the blower?

1slow370

I'm sorry if you don't understand these things but if the crank is putting out 20% less belt speed and you install a 20% overdriven pulley on a supercharger they cancel out and it like having stock pulley only you gain the 5hp from slowing down the accessories. More heat? the blower won't be turning even 1rpm faster than would be with stock pulleys. Its called not wasting a $250 underdrive pulley. You must be a turbo guy.

Besides that they use a smaller pulley to go up in stages with the power so along with more heat there's a lot more air but that's irrelavent to my earlier post.

ZKindaGuy

I didn't read the post thoroughly enough to put it together that one pulley percentage would cancel out the other. All I did was immediately zero in on the "overspin the blower" text. Yes that is my bad for not reading the entire context of the message but but that is certainly no reason to prefix yopur answer with a degrading barb. And don't even try to say that wasn't your intention because I just won't buy it.

As someone once posted here previously that hiding anonimously behind a computer screen certainly makes some folks awfully brave.....and just plain rude