Excelerate

iTrader: (1)

CleanCL was kind enough to purchase a factory crank pulley and send it to us and we have confirmed with UR that the pulley is the same as the one for the 3rd gen TL (04-08). Maybe CleanCL can chime in but I assume he got the pulley for the AWD TL; we will have to cross reference the #'s for the FWD but I'm sure it will be the same.

On a positive note Acura actually took a hint and lightened up the factory pulley; this pulley was more than 2 lbs lighter than the 3rd gen TL OE pulley.

Iceman52489

So whats the difference between UR's crank pulley and the stock pulley? What benefits would be gained?

CleanCL

iTrader: (4)

Yes, the pulley I sent over was for the AWD model. Someone will have to verify the part numbers for the 3.5L motor.

Excelerate

iTrader: (1)

The stock pulley is heavier. The UR crank pulley is just under a pound so the lighter weight results in less spinning weight and better throttle response.

Bearcat94

Also the energy to move that extra weight can now be directed to the drive train. Ulimately, some will make it to the wheels.

If forget precisely for the 3G (which had the somewhat heavier OE Pulley), but I think the dyno gains were somewhere in the 7 - 10 WHP area (UR's site estimates 10 - 14 "HP Increase").

Assuming that is in the ball park (Josh perhaps can confirm or eloborate), the 4G gains should be slightly lower due to a little less wieght differential between the UR and OE pulley's and an assumed greater drive train loss in the 4G AWD.

Excelerate

iTrader: (1)

Yes the gains might be slightly less since the factory pulley was a couple pounds lighter from the factory but there will still be gains and the throttle response is definitely improved.

CleanCL

iTrader: (4)

I'd say the gains would be almost identical. The simple fact that the factory pulley is lighter weight than the previous generation is a moot point. The motor is 3.7L with totally different intake, camshafts, internals, etc, etc.