Im looking for an underdrive pulley set for my 1987 Trans-am ..Any suggestions, Can you really tell increase in HP..Ive got a little work like flowmater, straight pipe, 160 stat, KN.,..im going to port plenum and runners too...
How much and where to buy and how much gain?
ALSO any other mods for my car that would help it out
THanks
AJ

Looking for a rear end also
aj

 

Dont waste your money on the pullies. Get yourself a set of Flowtech or Headdmen headders. Cheap and easy, just the way I like it. $200 bucks total. Best bang for the buck mod I've done yet.
Later Barrett

 

IMO every bit counts. If you are willing to spend the money buy the March Power and Amp 3-piece set. They will give you 11 HP (aprox) and look pretty good too. If you use the March Performance set which has a larger than stock alternator pulley, the alternator will not turn fast enough and you'll get on the red on the gauge.

http://www.marchperf.com/pg1.html

I have a set in my GTA and I'm very satisfied with it. For price you'll have to call around.

Ozzy

 

Not worth the money. Everyone I've talked to never saw any HP gain.

 

SOP feel was a little gain but i also did the k&n at the same itme so im not sure
but i agree with wataru get some flowtechs gut your cat and get a flowmaster and you will pick up gobes of pawer and also get rid of your smog

 

Agreed, you will get more gain from a set of headers, but get them ceramic coated and save yourself some grief.

You'll get some HP from underdrive pulley(s) and a little quicker rev. Consider that most are 20% underdrive and how much HP is used to spin the accessories. If you normalize trap speeds for weather you will see a slight increase but the SOTP won't feel it. Summit sells March sets; March makes a very nice product.

I run March underdrive on the IROC and on the Vette; indeed, every little bit adds up.

 

I liked my march pullies, the gains I realized are in my sig. Just get the 2 piece set, the ALT. pulley is actually smaller to speed it up more. If you get the 3 piece set, the water pump pulley will be smaller also to speed it up.

Headers will also help.

nick

 

Unless you changed the pullies at the track the same day & ran back to back runs. Your increase could be very well due to some other factor such temp, humidity, barometic pressure, wind, etc.

 

I had the same results when I put pullies on my 85 TA.