In Reply to: Underdrive Pully? Worth It? posted by John Owens on October 25, 2000 at 13:09:06:
I've done about everything you can for a 98 2.8 or atleast looked into it.
I needed more power in my 2.8 so my upgrades went as follows.... Dinan intake.... Supersprint exhaust.... Jim C ECU.... ERT Underdrive pulley..... MechTech turbo.... RPS clutch (stock flywheel)... UUC tranny enforcer..... M roadster shifter..... Aquamist water injector.... now waiting for my 26# fuel injectors.
Of all the mods made before the turbo... the underdrive pulley made the biggest difference. Not... "seems like it has more power"... but a definate.... "DAMN, it's got more power". I dynoed the car multiple times. ( I have free access to a Dynojet) The ERT pulley gave me 7 hp and an 11 ftlb torque increase. The torque was improved throughout the entire rev range and very noticable. The runs were made about an hour apart. My final normally aspirated numbers were around 182 hp and 190 ft lbs of torque at the wheels. Same power to weight ratio as a stock E36 M3.
I have over 15,000 miles on the car since the underdrive pulley. All stop and go city traffic, hot turbo under the hood, upgraded stereo/amp along with multiple runs in the ad hoc street drags and sponsered track drag racing. No problems with the underdrive pulley causing an overheat condition, no problems with power steering, no problems with dead batteries, and no broken crankshafts. The only problem associated with the underdrive pulley is slightly dim lights at idle... normal at >1000 rpms.
Cheuk in Seoul
98 2.8 Z3 Turbo
93 RX-7 single turbo conversion