Has anyone seen the dyno graph on UR's website? That's a scary AFR!

 

You might wanna re-torque the crank bolt after a little bit of driving. My Stock OEM pulley came off and with it detroyed the key on the crank shaft and spun my crank bending all the valves just a month ago or so. I had to replace my motor. There had not been any work done on the lower end of the car at all. It just came loose. Weird I thought.
Here are the pics as I was removing the motor.





and then the re-install with a new undersdrive pulley. I torqued the he!! out of that bolt....I pray it doesn't ever come back off.

 

ati crank pulleys are dampened, but they are a bit pricey

 

i have the stillen pulleys. can say that when i got them, i definitely felt an increase in HP. 2nd gear just pulls on you, its awesome

,... but now that im used to it, my car feels slow again

 

BTW Do u need to remove the engine to install these pulleys?

 

No, you can reach the crank pulley bolt from under the car.

 

I had a before and after dyno when my UR underdrive pulleys were installed and the shop said that there were no gains.

 

^ so what's the point in the first place?

 

^I won't be able to dyno my car till 3 weeks from now. I'll post the results on here.

 

Cool looking forward to it

 

The lower the inertia of a rotating object, the easier it is to spin. Imagine if I put carbon fiber wheels on you bicycle - you still have the same power but you're going to get going a lot quicker. The down side is that as soon as you stop pedaling you lose momentum quicker.

Same idea behind lighter flywheels and wheels.