1.5 KB people - what pulley size makes what boost?

[Toasty]

So I have my 1.5 installed and running. I'm fairly happy, but I dont yet have a boost gauge installed so I went back to my KB install guide to confirm how much boost I am making on paper at least.

Now about two months ago I called KB and told them I had a 1.5 (provided the model stamping from the side of the blower) and a *stock* bottom pulley. I then asked them to provide me with a SC pulley to make 6-7 PSI. They shipped me a 3" pulley and thats what I am running today.

Looking thru the matrix in the install guide, there isnt a 6-7 psi listing with a 3" SC pulley AND a stock 6.5" bottom pulley. There is a 7psi listing with a 3" SC pulley and a 5" KB bottom pulley.

I'm confused. Did KB screw up royally? Are the docs outdated because I have an older 1.5?

What are you 1.5 guys out there running in terms of SC and crank pulley sizes to get in the 6-7 PSI range?

TIA

P.S. Please dont post the link to http://www.kennebell.net/superchargers/ford/mustang-cobra46/mustangcobra46.htm, since I think that boost chart is for the new 2,1l big bore.

 

[venom1997]

3 1/4...5-6#
3 1/8...6-7#
3........7-8#
2 7/8...8-9#
2 3/4...9-10#
2 5/8...10-11#
2 1/2...11-12#

these are the supercharger pulley size to psi ratio for the 1.5l with stock 6.5 inch crank. i am running the 2.5in s/c pulley with stock 6.5in crank and i am at 12 psi so your 3in should give you 7-8 psi:beer:

 

[Toasty]

3 1/4...5-6#
3 1/8...6-7#
3........7-8#
2 7/8...8-9#
2 3/4...9-10#
2 5/8...10-11#
2 1/2...11-12#

these are the supercharger pulley size to psi ratio for the 1.5l with stock 6.5 inch crank. i am running the 2.5in s/c pulley with stock 6.5in crank and i am at 12 psi so your 3in should give you 7-8 psi:beer:

Awesome. Can I ask where you got the info? I trust your numbers, but I'm curious as to the original source.

 

[cobra4v]

Yes...those numbers posted are the same info given in the installation manual of the KB 1.5 S/C kit.

 

[venom1997]

yes these are the ones in the manual and are really accurate i have the 2 7/8 pulley and i seen around 9psi also the 2.75 i seen 10psi and now i use the 2.5 and im at 12 psi

 

[Toasty]

Yes...those numbers posted are the same info given in the installation manual of the KB 1.5 S/C kit.

Cool. When I ordered an install manual from KB for the used 1.5 I picked up KB must have sent me the latest install manual for a 1.7 or 2.1 as the pulley chart in my guide is whats posted on their website for the 2.1.

 

[venom1997]

i would still use the 3 inch if thats what you have it will be safe on your set up even the 2 7/8 would be safe i know you said you wanted the 6-7 but you have the 3 in 7-8 which is 10 more hp vs the 6-7 you will be fine with the 3 in

 

[Toasty]

i would still use the 3 inch if thats what you have it will be safe on your set up even the 2 7/8 would be safe i know you said you wanted the 6-7 but you have the 3 in 7-8 which is 10 more hp vs the 6-7 you will be fine with the 3 in

Yep thats whats on the car now. Cheers!