Upper pulley vs lower pulley???

[got_h8rs?]

If you had to pick which would it be and why?

 

[carguy19]

Lower.

No slip and makes more torque then an upper pulley.

 

[Ky GT500]

Yep,,,^^^^^^

 

[07 Black Beauty]

Agreed ^

 

[Blackdevil77]

Poll is tied, interesting.

 

[07 Black Beauty]

Poll is tied, interesting.

Most probably opt for the upper pulley because of cost and ease of install.

 

[little-dw]

Most probably opt for the upper pulley because of cost and ease of install.

also, because I did not want to shave off anything on the motor. Apparently you have to grind down the crank sensor mount in order to run the 10% lower (not sure how much). Also the 15% lower, which will not work on track pack cars without re-routing some lines

 

[07 Black Beauty]

also, because I did not want to shave off anything on the motor. Apparently you have to grind down the crank sensor mount in order to run the 10% lower (not sure how much). Also the 15% lower, which will not work on track pack cars without re-routing some lines

I thought you only needed to grind to fit the 15% lower?

 

[little-dw]

I thought you only needed to grind to fit the 15% lower?

I thought I read somewhere...

10%: grind to fit
15%: grind to fit and will have issues with track pack cars

 

[Blackdevil77]

How much grinding is necessary?

 

[Devious_Snake]

10% usually fits with no issues

15% requires the grind


For just basic bolt on's which a lot of guys prefer, upper pulley for me with a gates belt

 

[little-dw]

How much grinding is necessary?

looks like a 1/4 of an inch maybe?

this thread was where I seen it... http://www.svtperformance.com/forum...al-Write-Up-Installation-of-IW-10-OD-Balancer

 

[got_h8rs?]

Thanks for the feedback!

 

[got_h8rs?]

View attachment 41984

looks like a 1/4 of an inch maybe?

this thread was where I seen it... http://www.svtperformance.com/forum...al-Write-Up-Installation-of-IW-10-OD-Balancer

That's on an 2008 car not a 13-14. Does anyone have first hand experience if the 10% fits without grinding?

 

[VFORCEJOHN]

You have to grind for a 10%. THe 10% pulley will fit, but you'll never get a belt in there. So that's basically what you're clearance for. I learned the hard way...

 

[VFORCEJOHN]

My main thought about doing the 10 lower was belt grip. but also, the negative was heavier, larger, and it overdrives ALL the accessories it runs. Not just the supercharger.

the upper. it's lighter, smaller, and only overdrives the supercharger.

Now if I think about it. I'm not sure if I made the right choice?

 

[got_h8rs?]

My main thought about doing the 10 lower was belt grip. but also, the negative was heavier, larger, and it overdrives ALL the accessories it runs. Not just the supercharger.

the upper. it's lighter, smaller, and only overdrives the supercharger.

Now if I think about it. I'm not sure if I made the right choice?

I know the lower makes more torque but how significant is the torque/horsepower on the lower vs the upper?

 

[biminiLX]

Where's the choice for both? ;-)
I like the SFI lower as a foundation, love my 15%.
-J

 

[Blackdevil77]

My main thought about doing the 10 lower was belt grip. but also, the negative was heavier, larger, and it overdrives ALL the accessories it runs. Not just the supercharger.

the upper. it's lighter, smaller, and only overdrives the supercharger.

Now if I think about it. I'm not sure if I made the right choice?

I thought the 10% lower was lighter than the factory pulley (depending on which 10% you get) and the accessory belt was separate and doesn't get overdriven like the supercharger?

 

[got_h8rs?]

I thought the 10% lower was lighter than the factory pulley (depending on which 10% you get) and the accessory belt was separate and doesn't get overdriven like the supercharger?

X2

Can anyone chime in that knows for sure?