[sprintamx]

Ok folks, post HB pulley install report . . . $%^_)%$#%_&@##$!!!!!


How's that for a disciplined, scientific, data-driven report!


Install was straightforward as expected; with the right tools and practice the pulley swap really can be done in 5-10 minutes. New tune by Mike at Moto-East. Upgrade fuel pump and injectors from original install with flex-fuel. Currently running on e85 but will likely run 93 oct most of the time.


Power band and progressive power development through the band is essentially the same, there's just much more power everywhere. The power is now neck-snapping! Excellent response throughout the rev range, great roll-on power and an absolute blast (on public roads mind you) from 3500 rpm and beyond. There is just no question that the HB pulley produces much more power with the JRSC set up.


Ambient temps were around 43 F, and I did not experience any clutch slip in my 10 miles of testing. This is likely to become an issue, but I won't take any steps until slippage starts occurring.


With the amount of power now on tap and how much quicker the car is as a result, I think supporting systems such as brakes and suspension are going to become interesting limiting factors. We'll have to see how that plays out.


One immediate practical benefit is gaining clearance between the intake tube and the rotrex pulley because of the smaller diameter. I noticed contact between the standard pulley and the tube, and that the pulley was starting to cut into the clamp and tube. This suggests a need to pay attention to the installation and check on the location regularly. I admit I never looked that closely before. Shame on me.


Ultimately, the pros, cons and potential dangers have been well-discussed. But this is a terrific and very entertaining upgrade if you already have the supporting components or are ready to take the plunge with pump, injectors and an appropriate tune.


Thank you JR and Moto-East!