To those who have installed underdrive pulleys on their cars, I was just wondering if i would notice an increase in power on my 06 gt 5sp with CAI and 91 oct tune?
99.9% of the people out there will not admit to making a bad mod and wasting their money. It’s probably not conscious. The subconscious part of their brain that helps them justify their purchases will make them believe anything.
There was a guy on here once that paid big money to have cams put in his car, which LOST him HP but worst of all torque down low. He was convinced the drivability of the car was better and was happy with his purchase. Clearly his wallet was doing the thinking for him.
I have never purchased under drive pullies (I have been doing this 20+ years now) but I have had lots of friends that did….and swore they were the most amazing thing in the world. I drove all of their cars and couldn’t tell the difference.
These aren’t the old 5.0 days where a couple hundred bucks would get you 10+hp. Ford designed a 4.6L that puts out almost 100 more RWHP than the 5.0L cars did. They did it by maximizing everything on the motor. There are no more free lunches. After a CAI and a tune get your wallet out and be prepared to spend a lot of $$/hp.
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Under Construction. Better, Stronger, Faster than it was before.
what about MPG? i was in the mid 30's, then i put new tires on (stock size) and i struggled for 27. i did CMCV deletes and mufflers and am now pushing 30 and so i have been looking at pullies.
99.9% of the people out there will not admit to making a bad mod and wasting their money. It’s probably not conscious. The subconscious part of their brain that helps them justify their purchases will make them believe anything.
There was a guy on here once that paid big money to have cams put in his car, which LOST him HP but worst of all torque down low. He was convinced the drivability of the car was better and was happy with his purchase. Clearly his wallet was doing the thinking for him.
I have never purchased under drive pullies (I have been doing this 20+ years now) but I have had lots of friends that did….and swore they were the most amazing thing in the world. I drove all of their cars and couldn’t tell the difference.
These aren’t the old 5.0 days where a couple hundred bucks would get you 10+hp. Ford designed a 4.6L that puts out almost 100 more RWHP than the 5.0L cars did. They did it by maximizing everything on the motor. There are no more free lunches. After a CAI and a tune get your wallet out and be prepared to spend a lot of $$/hp.
Squidd got it right,these cars take a lot of $ to make big HP !!!
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`06 Redfire GT Premium Coupe,398 Stroker,Whipple Supercharged,Comp Cams, Ford Racing CNC ported heads & throttle body,JBA longtubes,4:10`s with Eaton posi,Moser 31 spline axles,5R55S auto trans w/billet 3500 stall converter by Level Ten, TCI ratchet shifter,BMR K member ,A arms,trailing arms & drive shaft loop,aluminum drive shaft, ,BFG KDWS`s on Am Racing,CDC chin spoiler,Roush rear wing,custom roll bar by JW Racing & fabrication Shelton Conn, engine & tuning by Jannetty Racing Waterbury Conn.
Tlaked to a very knowledgeable Mustang guy at the local dealership(FRPP& Rousch dealer) He told me Id be better off advancing timing 2 degrees for a 93 oct tune with my Diablosport to get the 8-10HP Rousch claims to get with their kit. He told me pretty much what you guys did, that I really wouldnt notice anything and I,d be 220$ poorer! Do you guys agree?
If they give you 3-5 hp, that's 3-5 you did not have the way I look at it. They reduce accessory speed by 25% so they can't do anything but free up some power. Now I don't know whether the 3-5 is worth the cost of the pullies to you or not but I try to get every single horsepower that I can. But that is just how I look at it. Heck, I even removed my windshield washer tank to get 8 lbs of the front of my car!! (yes I weighed it!) Add that to the spare tire and jack that I took out, the lighter weight front radiator support and aluminum driveshaft that I installed and it starts to add up. Horsepower to me is the same way. Its the little things that add up. Also, I will add that everything that I have done has helped and it is not my imagination. Just ask the guy with the 2006 C6 Vette that I wasn't supposed to outrun!! JMO
what about MPG? i was in the mid 30's, then i put new tires on (stock size) and i struggled for 27. i did CMCV deletes and mufflers and am now pushing 30 and so i have been looking at pullies.
The point of UDP’s is that they accelerate faster because they are lighter and the accessories don’t have to accelerate as fast. That’s why you MAY see them on an inertia dyno. But once the motor is running at a steady state the fact that the accessories are running a little bit slower is so inconsequential that it would be almost impossible to come up with a way to measure it.
And if you could get any appreciable gas mileage gain by spinning the accessories slower at cruising RPM the manufactures would have a system to do it. They spend millions of dollars trying to get 1/10 more MPG out of cars. Setting up a variable ratio pulley is a piece of cake.
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Under Construction. Better, Stronger, Faster than it was before.
Muscle Mustangs and Fast Fords, October 2009, page 88.
Quote: " Next on the list was a set of underdrive pulleys from Steeda. The kit comes with a new crank and water pump pulleys, and reduces accessory drivespeed by about 25 percent. The pulleys have a great OE fit and finish, and install in no time. After reinstalling the serpentine belt, our '10 spun the rollers to just under 287 rwhp and 304 ft-lb of torque, netting us a gain of just shy of 10 rwhp and 8 lb-ft of torque." Unquote
Muscle Mustangs and Fast Fords, October 2009, page 88.
Quote: " Next on the list was a set of underdrive pulleys from Steeda. The kit comes with a new crank and water pump pulleys, and reduces accessory drivespeed by about 25 percent. The pulleys have a great OE fit and finish, and install in no time. After reinstalling the serpentine belt, our '10 spun the rollers to just under 287 rwhp and 304 ft-lb of torque, netting us a gain of just shy of 10 rwhp and 8 lb-ft of torque." Unquote
Yeah, that may actually mean something if. A) They did their dyno work in a way even resembling a scientific manner. I can show you 10-20hp swings from run to run WITHOUT making any parts changes. B) It was not an inertia dyno (which I mentioned above). C) It was not in the magazines best interest to make their testing results as spectacular as possible for the companies that pay them their paychecks (advertising) and throw tons of free parts at them. Magazines are not 3rd party testers.
Find a dyno graph without an agenda.
Better yet find me a poster without an agenda with a dyno graph without an agenda.
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Under Construction. Better, Stronger, Faster than it was before.
Underdrive pulley kit for 2006 Mustang GT 
,these cars take a lot of $ to make big HP !!!
