Come spring I am going with a smaller pulley. Current Mods, SD headers, FWI, Gen V supercharger w/L32 intake, 104 Autolite plugs, 180 stat. I have no KR with this set up.
My question is the pulley size on my next Mod, 3.4, 3.5 or 3.6. Obliviously I want the largest possible without damage to engine and excessive KR. Most suppliers say a 3.4 but that is with the Gen III not the Gen V. I will add a modular hub, so I can change if needed. I need help on determining the right size of the pulley. I will be doing a tune after the install.

Your thoughts or comments greatly appreciated.

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1997 SSEI 3.8 L67 149,000 miles Moonroof, Polished Gen V w/L32 intake, 3.5 mod. Pulley, SD Headers, Intense Stage 1 tune, MagnaFlow Cat 94109, Catco catback, Autolite 103s, 180 stat, Intense FWI, 1995 OEM trans cooler, Cleared corners. KYB Excel G struts and shocks.


2006 Malibu SS 3.9 60 degree V6, Variable Valve, Tap shift Trans, 100,000 miles Bone stock

SOLD - 1992 SSEI FWI PEM Catco Cat NGK TR55 180 stat Original owner 209,000 miles Original Engine and Trans - Still strong when she left

as a general rule of thumb, you upsize .2 from the Gen 3 pulley. With the headers I wouldn't be afraid of a 3.4

Thank you, Just do not want to overdue it. With the Gen V being more efficient, I worry that the 3.4 might be too much.

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1997 SSEI 3.8 L67 149,000 miles Moonroof, Polished Gen V w/L32 intake, 3.5 mod. Pulley, SD Headers, Intense Stage 1 tune, MagnaFlow Cat 94109, Catco catback, Autolite 103s, 180 stat, Intense FWI, 1995 OEM trans cooler, Cleared corners. KYB Excel G struts and shocks.


2006 Malibu SS 3.9 60 degree V6, Variable Valve, Tap shift Trans, 100,000 miles Bone stock

SOLD - 1992 SSEI FWI PEM Catco Cat NGK TR55 180 stat Original owner 209,000 miles Original Engine and Trans - Still strong when she left

3.4" but you really should add an aeroforce scan gauge to monitor KR after heat soak conditions

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2000 SSEi - SilverBullet - 78,000 kms, 4" "straight shot" custom headlight ram air inlet, TOGs, 1.9's, Lsd, 2.9-3.4"MPS 10-15 psi, Ported GenV, EGR eliminated, OR pushrods, oil volume kit, trani cooler & shift kit, Titanium retainers, 90 lb springs, 160 Stat, 42# injectors, Fuel pump voltage increase, Wideband O2, 3" to dual 2 1/2" Magnaflows, Snow Meth/water injection, after SC temp gauge, 255/50WR17, timing commander set 15-18*@WOT, 2 speed Fan over-ride, disabled DRL, Solid motor mount, Meziere Electric water pump, adjustable fuel pressure regulator, Drilled & slotted rotors/ceramics, GXP sway bars and STB, Upgraded and rebuilt transmission with ZZP 2500 rpm stall TC, Pioneer Bluetooth stereo with sub and 800 W amps, PB 13.5 quarter, (April 2014 car of the month)

Thanks for the reply. I have torque pro app. with blue tooth OBD2 adapter, I know that is not the same as Areoforce guage but it does show KR. If I am reading it right, I currently have zero KR. Areoforce would be a great plus but it is a little pricey. Needing some new struts as well (hole in bellows of rear shock, ERC), and funds are not unlimited. May have to reorder my priorities on upgrades. This is a long term project, I really love the Bonnie, trying to make it my last car. It is my DD but I only have a very short drive to work. Again thanks.

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1997 SSEI 3.8 L67 149,000 miles Moonroof, Polished Gen V w/L32 intake, 3.5 mod. Pulley, SD Headers, Intense Stage 1 tune, MagnaFlow Cat 94109, Catco catback, Autolite 103s, 180 stat, Intense FWI, 1995 OEM trans cooler, Cleared corners. KYB Excel G struts and shocks.


2006 Malibu SS 3.9 60 degree V6, Variable Valve, Tap shift Trans, 100,000 miles Bone stock

SOLD - 1992 SSEI FWI PEM Catco Cat NGK TR55 180 stat Original owner 209,000 miles Original Engine and Trans - Still strong when she left

I run a 3.4" on my GenV but I'm at 5000+ Ft Elevation. I have Plog/Downpipe, Intake and a Custom tune. 0 KR. Did dyno/Tune with 3.25" but not able to run as much timing so I went back to 3.4" and more timing, only like a 5-10HP difference and I feel its safer for the motor.

Depending on where you are, you may want to run a 3.5" but it depends on your tuning abilities, where you live and whatnot.

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Shane "RedZMonte"
2004 Z16 Z06: Virgin
2000 SSEi: Kenwood DDX512, 3.25" MPS, ZZP DP, PLog, Puck Mount, NGK TR7's, DHP Tuned
1995 Monte Z34: T04e "60" turbo, 42.5# injectors, Borla Catback, OBDII swap, DHP Tuned, Much more...

I think I'm going to go with a 3.5 inch with a modular hub for now. Maybe add 1.9 rockers down the road then drop a size. Have to replace the shocks and struts first.

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1997 SSEI 3.8 L67 149,000 miles Moonroof, Polished Gen V w/L32 intake, 3.5 mod. Pulley, SD Headers, Intense Stage 1 tune, MagnaFlow Cat 94109, Catco catback, Autolite 103s, 180 stat, Intense FWI, 1995 OEM trans cooler, Cleared corners. KYB Excel G struts and shocks.


2006 Malibu SS 3.9 60 degree V6, Variable Valve, Tap shift Trans, 100,000 miles Bone stock

SOLD - 1992 SSEI FWI PEM Catco Cat NGK TR55 180 stat Original owner 209,000 miles Original Engine and Trans - Still strong when she left