No noticable change in fuel economy, still rolls as easily as ever off idle. All I know is that when the wheels are off th eground, you turn one and they both turn the same way now. Peloquin himself: (I think this was up earlier in the thread)
[SIZE=-1] Gary Peloquin described customers' reactions to the Stage II Diff Upgrade this way:
"The first reaction is that people really notice the difference in the steering response under power. The car steers tighter - on the throttle the car goes toward the apex. The guys who live in the snow and the ice really love the added winter traction". If those descriptions sound to you like the way people describe the action of the high-priced Torsional differential, you're on the right track. Make no mistake, this under $100 easy to install product is no substitute for a $1,000-plus Torsional installation. However, it's a great alternative for the person on a limited budget or the racer in classes that do not allow a full-on limited slip or special differential.
The original pre-load differential was introduced with the second year GTI, back in 1983 on the 1984 models. New, it felt like a limited slip on the rack, but one turn by hand and it was clear that the two or three pounds of preload it offered was of little or no value as a limited slip. It was probably added by the factory to reduce vibration, but that didn't stop the less-scrupulous tuners from touting it as a limited slip, even with only 2%.
This upgrade isn't something new, either. Peloquin's came out with a Stage I version with about 25 pounds of breakaway torque some five years ago, after a solid year of development and Peloquin's-style testing - which is to say severe testing. In February of 1996, Peloquin introduced the Stage II 80% Diff Upgrade with about 85 pounds of breakaway torque, obtained by further modifications to the brass washers and more preload.
The 80% is obtained by the aluminum puck seals being bolted to the differential, and doubles the pressure on the brass shims.
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I see no mention of these wearing out or a recommended replacement period on any of thes ites I have read, not even the peloquin main page. If anyone finds something do post.