Mustang V6 underdrive pulleys

sunriser123 · 10-11-2008

Hi ya'll! I have a question which I hope you can help me with. I have a 2006 4.0 V6. I can't figure out whether to get 42% underdrive pulleys or 25% under drive pulleys. I'd also like to know the best tuner I can get for my car. I don't know if this makes a difference, but in about a year, I plan to install a supercharger. So far, I've installed a cold air intake, dual exhaust and lowering springs. Thanks in advance forall your help.

sk8boardpunk220 · 10-11-2008

you can go to www.americanmuscle.com they have a few different tuners there. thats where im getting all my stuff.

heavy metal · 10-11-2008

Welcome to the site!!!!

**stlwagon** · 10-11-2008

Welcome... Go with the 25%.

sunriser123 · 10-11-2008

Thanks for the help......

**stlwagon** · 10-11-2008

Are the underdrive pulleys still $200+ for the V6?

63Bmechanic · 10-12-2008

hey dude, if your planning to supercharge, dont waste the money on under drive pulleys, they will under drive your SC.

LedZepplin77 · 10-12-2008

Any good installation guides out for the UDP install? I really want to get one because it is a great deal for 275 bucks, 10 more hp and 2+ mpg's. However, I am waivering on buying because of the difficulty involved, was wondering if there are any guides out there, because I can't find one.

**stlwagon** · 10-12-2008

Here's a good writeup for a GT.
Steeda Underdrive Pulley install (with pics) - The Mustang Source Forums

billthecougnut · 10-12-2008

Quote:

Originally Posted by 63Bmechanic

hey dude, if your planning to supercharge, dont waste the money on under drive pulleys, they will under drive your SC.

I was wondering....... Since you can get smaller pullies for the superchargers to increase bost, theorretically cant you use an underdrive crank pully with a higher boost pully and end up with a simmilar net boost on the supercharger for less of a parasitic loss at the crank? (theoretically of course)

63Bmechanic · 10-12-2008

im not quite sure it works that way.

billthecougnut · 10-13-2008

Quote:

Originally Posted by 63Bmechanic

im not quite sure it works that way.

Seriously though, if you bought a .42 underdrive pully and a 14 psi pully for the supercharger, then the net boost would be 8.2 psi (if you wanted only to run 8 psi) and you would have the benefit of the boost AND the benifit of the reduced drag........ neting 10 more hp at the flywheel than if you used the stock pullies

RIGHT???

(not really planning to do this, but it COULD be done right?)

Mr. Ugly · 10-13-2008

That can work, in theory. But you have to be careful of going too small on the blower pulley. Harder to turn the blower, and you can get belt slip, I believe.

63Bmechanic · 10-14-2008

Quote:

Originally Posted by Mr. Ugly

That can work, in theory. But you have to be careful of going too small on the blower pulley. Harder to turn the blower, and you can get belt slip, I believe.

yeah thats what i thought too.

**stlwagon** · 10-14-2008

I don't think you ever want to underdrive a supercharge.