Billet flow pulleys

[q8sniper]

Hey all I have 2004 cobra with billet flow pulleys and stock idler
Kenne bell 2.4 with 2.76 uber and stock lower its make 14psi
is this normal ? If yes what pulley should I go with to make 18-20 psi and what belt number
thanx all

 

[Zemedici]

you have a kb 2.4?

 

[q8sniper]

you have a kb 2.4?

Yes 2.4 kb blowzila

 

[cj428mach]

I wouldn't think thats right. My 2.3 Whipple makes 18+ psi when I had the 2.8" pulley on it for like a day lol. Your 2.4 should be generating more boost since its a bigger displacement.

 

[bigmoose]

I'm guessing belt slip since you don't have an idler. My 2.2 with a 2.76 does 18-19#

 

[q8sniper]

I'm guessing belt slip since you don't have an idler. My 2.2 with a 2.76 does 18-19#

I just called Lethal and they said I'll need to change crank pulley to get 18 psi

 

[bigmoose]

I just called Lethal and they said I'll need to change crank pulley to get 18 psi

That's not right. Kenne bell specs say you should see 21.5# with just a 2.75" pulley with the 2.4 Blowzilla.

Something is broken or you have belt slip.

http://kennebell.net/KBWebsite/Common/pdfs/CobraBigBoreBoostPulleyRatio.pdf

 

[bigmoose]

Have you verified your bypass is closing all the way? For a quick test you can zip tie it closed and see if your boost comes up.