Underdrive Pulleys and RWHP ???

BelueLX

Founding Member

Jul 10, 1999

1,195

1

0

Oct 24, 2004

#1

• Oct 24, 2004

• #1

Ive had a few sets of underdrive pulleys on various Mustangs and seen some pretty good results as far as ET and trap speeds (like .1 / nearly 1.5 mph...). Has anyone actually taken the time and trouble to do a before and after dyno? Just wondering not that its of any importance just wondering if anyone that doesn't sell these for a living has done a dyno run. Thanks,

Cody B

 

Reactions: phil03mach1

-86GTStang

Member

Dec 27, 2003

165

0

16

Norway, Scandinavia

Oct 24, 2004

#2

• Oct 24, 2004

• #2

Dyno result..

Well, found a dyno test regarding this in a Super FORD ,
5.0 Magazine, April -97.-BOLT ON POWER.
This test was done with a -95 GT, and they used Auto
Specialties pulleys. ... boosted horsepower and torque across the rpm range. They started with a 2hp increase at 2000rpm and ended with a big 11rwhp improvment at
5000rpm (14-degree Timing, 196hp/229Tq before pulley install)

 

89MustangGX

I have nothing productive to add!

Jul 3, 2001

10,262

1

0

Mill Creek, WA

Oct 24, 2004

#3

• Oct 24, 2004

• #3

-86GTStang said:

Well, found a dyno test regarding this in a Super FORD ,
5.0 Magazine, April -97.-BOLT ON POWER.
This test was done with a -95 GT, and they used Auto
Specialties pulleys. ... boosted horsepower and torque across the rpm range. They started with a 2hp increase at 2000rpm and ended with a big 11rwhp improvment at
5000rpm (14-degree Timing, 196hp/229Tq before pulley install)

Click to expand...

Most of the ones I've seen are between 7-9hp in the higher RPM range, so I'd go along with that as well and say it's not uncommon.

 

90mustangGT

I felt sorry for girls because

Founding Member

Jan 15, 2002

2,773

17

89

Dallas, GA

Oct 24, 2004

#4

• Oct 24, 2004

• #4

U/D's were my first mod, made a very noticable difference in a stock 5.0. A few months ago I bought thier 3" Crank pulley, made a good difference even more on a modded car where the rpm's are rising quickly.

 

WhiteStallionGT

Member

Aug 19, 2004

465

0

17

Northern VA / VT

Oct 24, 2004

#5

• Oct 24, 2004

• #5

Do you guys think pullies on my 94 gt AODE would be worth it?

 

TrickStang37

New Member

Oct 17, 2004

292

0

0

Oct 24, 2004

#6

• Oct 24, 2004

• #6

Heres some dynos i have:
5.0 - Mods
73mm MAF
Pulleys
March Ram Air

RPM--------Stock----------Pulleys----|
----------HP----TQ-------HP----TQ---|
2500--|--116----244--|--118----248--|
2800--|--136----255--|--138----259--|
3000--|--150----263--|--152----266--|
3300--|--165----262--|--168----268--|
3500--|--177----265--|--180----270--|
3800--|--188----260--|--192----266--|
4000--|--194----254--|--198----260--|
4300--|--198----241--|--203----247--|
4500--|--200----233--|--205----239--|
4800--|--198----217--|--206----226--|
5000--|--197----207--|--204----214--|
5300--|--188----187--|--196----194--|
5500--|--176----168--|--187----179--|

 

TrickStang37

New Member

Oct 17, 2004

292

0

0

Oct 24, 2004

#7

• Oct 24, 2004

• #7

on a more modified car:

5.0 - Mods
Extrude Hone Ported Dart Windsor Heads (2.02/1.60 valves)
Extrude Hone Ported GT-40 Intake (upper/lower)
MAC shorty headers
10.6 compression
1.6rr
75mm TB
X303
77 ProM MAF
Pulleys

RPM--------Stock----------Pulleys----|
----------HP----TQ-------HP----TQ---|
2500--|--127----267--|--127----267--|
2800--|--152----285--|--152----284--|
3000--|--165----288--|--165----288--|
3300--|--198----314--|--195----311--|
3500--|--222----333--|--222----333--|
3800--|--241----333--|--243----336--|
4000--|--264----346--|--269----353--|
4300--|--293----358--|--295----361--|
4500--|--307----358--|--311----363--|
4800--|--317----347--|--322----352--|
5000--|--320----336--|--329----346--|
5300--|--325----322--|--334----331--|
5500--|--321----307--|--330----315--|
5800--|--315----281--|--319----289--|
6000--|--303----266--|--318----277--|

 

TrickStang37

New Member

Oct 17, 2004

292

0

0

Oct 24, 2004

#8

• Oct 24, 2004

• #8

i wonder why there was no gain till 3800+?

 

jb89coupe

New Member

Sep 3, 2004

416

0

0

CT

Oct 24, 2004

#9

• Oct 24, 2004

• #9

TrickStang37 said:

i wonder why there was no gain till 3800+?

Click to expand...

On the second one they actually killed power at 3300? Is that your car? Same day?

 

ponycar17

Founding Member

Nov 17, 2001

1,367

4

38

Upstate South Carolina

Oct 24, 2004

#10

• Oct 24, 2004

• #10

I've taken mine on and off several times, but I've never noticed any power difference at the seat of the pants, and no ET difference either... Maybe it's just me...

 

TrickStang37

New Member

Oct 17, 2004

292

0

0

Oct 24, 2004

#11

• Oct 24, 2004

• #11

the dyno runs are from a book I bought few years ago, "5.0L FORD DYNO TESTS" by Richard Holdener (has written in MM&FF, Car Craft, Super Ford, Mustang Illustrated blah, blah, blah tons of other ones). And that run was from an engine dyno runnin all accessories minus powersteering on the same day/conditions/probably minutes apart really.