Underdrive pullys

Hotroder383 · Apr 18, 2012

So i am going with an elctric fan to free up some HP and gain some MPG. I was thiking about goin with a set of Auto Specialties 504522 - Auto Specialties Underdrive Street Pulley Sets - Overview - SummitRacing.com Now i have never played with these before, are they worth the $180 with shipping? I see Jet has a set they say gain you 10-15 HP at the rear wheels. With a gain like that I'd be able to get my money back in MPG, yes I can actually keep my foot out of it LOL.
Just wondering if any one has used these and what they thought about them.

Graygoose · Apr 18, 2012

My son has under drive pullies on his Mustang, drags the engine RPM down alot at idle...so lower amperage output form his car, then adding electric fans, may have more 'power' when driving, but may concern me at idle.

talon6 · Apr 18, 2012

i had underdrive pullies once on my truck. and it also had charging issues. if you were going down the road it wasnt bad. but if you stop volts go right down. i took mine off. plus the hp they are telling you is way over exagerated. it might net you 5hp if you are lucky.more like 2-3hp. not worth the hassel in my opinion.

ohio mossy oak · Apr 18, 2012

talon6 said:
i had underdrive pullies once on my truck. and it also had charging issues. if you were going down the road it wasnt bad. but if you stop volts go right down. i took mine off. plus the hp they are telling you is way over exagerated. it might net you 5hp if you are lucky.more like 2-3hp. not worth the hassel in my opinion.

I was curious about that..And if anyone has had cooling issues(magnum engines mainly)....Did you have a load on the system like a large audio system..Or just normal accessories ?

Graygoose · Apr 18, 2012

my sons car was stock, no sound system at all...really slowed down components...

swamp_life hemi 05 · Apr 18, 2012

Wat is the ACTUAL help that the pulley will give? I don't see how a pulley can change performance???!?!??!

Sent from my ADR6350

talon6 · Apr 19, 2012

factory stereo. the only thing i had extra was a flexalite efan at the time. and it draws very low amps for a big fan.

Graygoose · Apr 19, 2012

swamp_life hemi 05 said:
Wat is the ACTUAL help that the pulley will give? I don't see how a pulley can change performance???!?!??!

Sent from my ADR6350

slows belt rotation, less drag on engine

ohio mossy oak · Apr 19, 2012

If I come across some cheap an used,I might try them..

Sent from my VM670 using Tapatalk 2

Hotroder383 · Apr 19, 2012

Ya I remember guys talkin about the charging issue. if 2-3hp is all that I would that is deff NOT worth the money. Even if I were to buy the crank and water pump pulley I wondered at the 10 HP they were saying. I'm with ya mossy, if I ran across a set used for around $75 I might try them but not payin that kinda money to not gain anything.

talon6 · Apr 19, 2012

i kinda think of 'em as a drag race thing.

Underdrive pullys

Hotroder383

Senior Member

Graygoose

Indecisive Car Owner

talon6

Senior Member

ohio mossy oak

Member

Graygoose

Indecisive Car Owner

swamp_life hemi 05

Senior Member

talon6

Senior Member

Graygoose

Indecisive Car Owner

ohio mossy oak

Member

Hotroder383

Senior Member

talon6

Senior Member

Similar threads

Latest posts

Members online

Forum statistics

Share this page