Just curious if these will work with the whipple that's on my truck? Edit: and does anyone know what size is stock on my model?

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we have 4.250 pully stock. and looking at the pullys for the cobra i'm pretty sure they will NOT work. if you go to the whipple site you can kinda see the two.

 

Yeah, I used the calipers and could see it was close to 4". Didn't know what part they measure from though to get the the size. Just wondering why it's so difficult to find pulleys for our setup.

 

Whipple is the only source that I've found. What size are you looking for? I'll be getting rid of my 4" pulley in the next month or so. 12 psi here I come.

 

how much boost were you making with the 4"

 

6.5 psi

 

Yes - Whipple is the only place I have found them also.
For every change in diameter of 1/8 inch- it changes 1 lb of boost.
Stock should have been 4 3/8 or 6 psi on a 2300 axo unit

So a 4 inch will make 7.5 psi

I have if needed...
4 3/8-6psi
4 1/4 -6.5psi
3 7/8-8.0psi

Hope this helps

 

thank you for the info.

 

Ideally yes; but the cam, exhaust, etc. will make the numbers sway a little. This is being discussed more in the thread about adding headers in this section.

If you don't mind me asking... What did whipple charge you for the pulleys? When did you purchase them? I've seen a range of $60-140 for each pulley. I was the 140.

 

Same here with shipping-who has them cheaper like $60???