kenne bell boost level help - 2003-04 Mach 1 Registry Owners Club

MUSCLEMUSTANG65 · 06-20-2013, 01:38 PM

I have a stock GT engine with a KB 2.1 w/ mammoth inlet/cobra tb. Currently its pushing 15psi with a 3" sc pulley and 7" crank. Im trying ti find out what boost level it would be running with a 2.76 sc pulley and 10% over crank pulley. According to KB tech it will be around 17,500 rpm and the max is 18,000 so ill be ok but im unsure of the boost level.
Yes itll be forged before i do this.

try846 · 06-23-2013, 08:29 AM

I have the Innovators West 10% overdrive with a 2.93 with my KB 2.1 and I made almost 17 lbs of boost, the KB site lists there pulley combos and amount of boost and HP. Soon to be on Dyno to see how much power it will make. I am running 9.5 compression so the chart is for 8.5 but it seems boost level is pretty close. I also converted to 8 rib as I had belt slip over 12 psi.

06-20-2013, 01:38 PM	#1
MUSCLEMUSTANG65 Registered User Join Date: Oct 2007 Location: WOODVILLE, AL Posts: 700	kenne bell boost level help I have a stock GT engine with a KB 2.1 w/ mammoth inlet/cobra tb. Currently its pushing 15psi with a 3" sc pulley and 7" crank. Im trying ti find out what boost level it would be running with a 2.76 sc pulley and 10% over crank pulley. According to KB tech it will be around 17,500 rpm and the max is 18,000 so ill be ok but im unsure of the boost level. Yes itll be forged before i do this. __________________ 2002 saleen S281SC

06-23-2013, 08:29 AM	#2
try846 Registered User Join Date: Aug 2005 Location: Massachusetts Posts: 414	Re: kenne bell boost level help I have the Innovators West 10% overdrive with a 2.93 with my KB 2.1 and I made almost 17 lbs of boost, the KB site lists there pulley combos and amount of boost and HP. Soon to be on Dyno to see how much power it will make. I am running 9.5 compression so the chart is for 8.5 but it seems boost level is pretty close. I also converted to 8 rib as I had belt slip over 12 psi. __________________ 2003 Azure Mach1 Fully forged shortblock w/ ARP hardware, JAN 05 heads, 8 rib setup IW 10% OD CS, RR 2.90 Pulley, Thump RR tensioner with KB 2.1 @18psi ,Accufab TB;AFCO dual pass HE,SCT X3,FAST 02 meter, Full JBA exhaust,Centerforce DFX Cl, Fidanza al FW, FRPP al. DS, FRPP traction lok rear w/FRPP 3.73 gears and FRPP 31 spline axles, FRPP rear axle girdle, UPR coil overs with tubular K member, Wilwood 6 pis. calipers w/ 2 piece , 03 cobra bumper. DYNO 550/550 16PSI

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