Underdrive pulleys

[steveb24]

Hey im new on here, just got a 02 gt 5spd..been saving for a while for it (about 4 years)..im 16 and that is my first car and im wondering about underdrive pulleys.. from my understanding i hear the alternator pulley messes with your headlights/electronic accesories.. are they worth it and do they acctually mess anything up?

 

[STNG_96]

There worth it, the only time that you will have issues with charging, is when your at a stop light, while your driving, no problem whatsoever. For me, the performance gains were deffinately worth it.

 

[steveb24]

that was fast reply..so if im playin my mach 1000 system, headlights on, and all that good stuff..it wolnt be a big deal..also what if i just put the water pump and crank pulleys on there..can you do that?

 

[03ghoststang]

you shouldn't have a problem with charging that because we have a high output alternator that even with the pullies you wont see your lights dim. I have them and everything is working properly on my 91' fox body though they do i have to get a bigger output alternator...

 

[mustanggt3685]

I have em as well. The only time I notice anything is when it idles for a long period of time, the battery charge goes down a bit, but nothing major. I'd go for it.

 

[Kilgore Trout]

I do not recommend underdrive pullies to anyone. The cost and the risk to your car are not worth 5 horsepower in my opinion.

 

[Newbie143]

I have them with NO Problems at all. I changed all 3 pulleys on my 04GT.Dont get anything besides Steeda's U/D pulleys

 

[csledd]

I also have Steeda U/D pulleys and they didn't effect any of my electronics in the car. It runs just the same as before.

 

[timeless2]

They (UDP's) are fine unless forced induction is in your future. Be sure to keep your stockers, no matter what.

 

[03ghoststang]

They (UDP's) are fine unless forced induction is in your future. Be sure to keep your stockers, no matter what.

yup that is a good point if your going forced inducted keep the stockers just place them somewhere for use.

 

[ponysarepretty]

I don't it should be an issue unless you idle your car for hours on end, which is in itself an issue. I am pretty sure the Bullitt was underdriven from the factory and it has not had any recalls due to improper charging or anything of that sort.

 

[mexis97gt]

why cant you use UDP'S with forced induction? someone please explain im kinda retarded when it comes to forced induction

 

[ponysarepretty]

why cant you use UDP'S with forced induction? someone please explain im kinda retarded when it comes to forced induction

the blowers aren't made to be used with the underdrive pullies.

 

[Crzyhrse]

Nice job on saving your own money for your own car. UDP's are one of the cheaper mods for a nice little gain.

 

[STNG_96]

Do not only use two pullies, and leave off the alternator pully. The aftermarket underdrives will be different sizes from your stockers, but in the end, they yeild the same distance for the belt to travel. So, you will need all three two prevent problems with them.

 

[kstng50]

Get them i have them with a system and have no problems

 

[Maza4ever14]

i have bbk udp, i had the alternator on there for a minute and had problems when starting my car. i would turn the key..and just get that tryin to wake up sound. i just swithed out the bbk alt. pulley for the old one and no problems whatsoever.