Have a '91 GTA 5.0TPI HO car with a '96 6-speed and '96 3.42 disc rear with headers, catback, air foil, plugs, wires, good tune up, coil, K&N, and other "little stuff", but am building a L98/ZZ4 for it and wondered if a set of pulleys would help. A lot of local guys I talk to say that ignition system and pulleys make a big difference (each seperately added). What ya guys think? Also, March or what? 2 or 3 piece? Any problems? Summitt, Jegs? Thanks for the help guys! Later

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'91 GTA:
www.fbody.com/members/91WS6GTA

 

Ignition helps to a point

pulleys....... spend the money on something else.

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1985 IROC-Z, nuff said :P

 

I have the March Power and Amp pulleys on my L98. If I gained any power, it was not enough to feel. I've heard guys say that it helps more on the top end since they have less drag and the higher the rpm's, the more they help. I don't know, but I would say definitely save your money for something else. I have not had any problems w/ them or any ill-effects (low batt. charge, etc.) at all, but I just didn't feel any SOTP difference.

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89 IROC 350 TPI, 700R4, 2.77 9-bolt w/ full exhaust, some bolt-ons, and free mods-G-Tech timed 14.8 @ 96 w/ terrible tires...Parts currently being shipped: AFR 190's, SuperRam, LPE 219/219 cam, Vigilante TQ converter, a "beefed up" 3.42 10-bolt, and some Spohn suspension parts

 

I would just sell it and get a 96 Trans am!!! j/j You will have to race me sometime so I can see how bad you will beat me.

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85 305tpi Trans am
flowmaster exaust
K&N air filter, 4:11 rear gears
Best 1/8mile 9.842@71.1mph
2.232 60ft.

 

I have put Underdrive pulley's on my present TA and my old 85 and both realized a .2 tenth gain in the 1/4 mile. They were both the march 2 pulley set, maybe I am the exception, but I have had good luck with them!

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14.48@93.72mph

 

Pulleys are one of those little things that help with a bunch of other **** thrown on with it. I have the power and amp series and they work just fine. The 3 pulley system is just for show they are not worth the money at all there is no reason to underdrive the water pump IMHO. I personally didnt notice any SOTP increase but I am sure it did help a bit. I am now however having problems with charging since I removed the smog crap.