Magnuson 2650 pulley chart?

swisstyphoon · 08-13-2020, 01:05 PM

Hi
I will order a Magnuson 2650 for my ZL1 soon.
Is there a chart for pulley vs. boost out yet?
Maybe you guys that own one can post their upper, and lower size, belt length/partnumber, and boost level to help others pick the right parts.

What boost level is recommended having a JMS Voltage booster only? Currently have a 15% lower, what upper do I need with the 2650?

IneedAZ · 08-13-2020, 03:46 PM

I will be using a 90mm with a 15% lower. For fuel, I'm adding the dsx aux pump and Lingenfelter high flow check valve, lastly cam with 38% lobe.

laynlo15 · 08-13-2020, 05:41 PM

Not sure but I've run 75 to 90 so which one do you need to know about? I ran all mine with a stock lower.

laynlo15 · 08-13-2020, 05:50 PM

I didn't get a chance to run the 70 mm because I didn't have enough fuel system to handle 20-21 psi of boost, the 75 mm is about 17-18, 80 is about 13-14. The 90 about 8-9 on. I didn't have a chance to run an 85 because we had none available when I put my 2650 on. Much depends on the header size, cats no cats, cam, ported heads or not. Elevation, Etc. So I'm trying to say your results may vary. I would order any additional pulleys from Griptec and not from Magnuson. Its only because once you get to higher boost the grip tech is not going to slip.

laynlo15 · 08-13-2020, 05:52 PM

I would stay with the 90mm since you have a larger lower. You will probably be 13 psi with the 90 and 15% lower. Buy a boost gauge or have HP Tuners to data log to know exactly what your boost is.

ExorsistzL1 · 08-13-2020, 09:07 PM

Whats interesting is i 1st ran 80mm and stock lower and was seeing 19 to 21lbs i went to 85mm and still hitting 17 to 18 . I currently have texas speed heads 19 zr1 cam 2650 with 103 nick williams TB AR headers cattless x pipe alky meth DSX low side aux fuel 93 im about to put a cam with 38% lobe so ill drop psi and get off the methanol. ( worried about pump failing on WOT) The kit came with 90mm but i think ill stay with 85mm and hope im around 13 to 14lbs

08-13-2020, 01:05 PM	#1
swisstyphoon Former GM Technician Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009 Location: Switzerland Posts: 341	Magnuson 2650 pulley chart? Hi I will order a Magnuson 2650 for my ZL1 soon. Is there a chart for pulley vs. boost out yet? Maybe you guys that own one can post their upper, and lower size, belt length/partnumber, and boost level to help others pick the right parts. What boost level is recommended having a JMS Voltage booster only? Currently have a 15% lower, what upper do I need with the 2650? __________________ 2018 Camaro ZL1 A10 Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, JMS Voltage Booster, Lingenfelter high flow check valve, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can 791whp, 772ft-lbs SAE Just added 30% XDI Injectors, LPE big bore hpfp, Flex fuel. Elite tuning, results coming soon. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: Swisstyphoon1980

08-13-2020, 03:46 PM	#2
IneedAZ Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009 Location: Tampa Posts: 5,110 View My Garage	I will be using a 90mm with a 15% lower. For fuel, I'm adding the dsx aux pump and Lingenfelter high flow check valve, lastly cam with 38% lobe. __________________ Sold 2012 2LT RS 12.3@112 old setup Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 Born 3/17/17Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. 807hp/762tq on 93 gas and 848hp/792tq on e47 Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive

08-13-2020, 05:41 PM	#3
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	Not sure but I've run 75 to 90 so which one do you need to know about? I ran all mine with a stock lower. __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

08-13-2020, 05:50 PM	#4
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	I didn't get a chance to run the 70 mm because I didn't have enough fuel system to handle 20-21 psi of boost, the 75 mm is about 17-18, 80 is about 13-14. The 90 about 8-9 on. I didn't have a chance to run an 85 because we had none available when I put my 2650 on. Much depends on the header size, cats no cats, cam, ported heads or not. Elevation, Etc. So I'm trying to say your results may vary. I would order any additional pulleys from Griptec and not from Magnuson. Its only because once you get to higher boost the grip tech is not going to slip. __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

08-13-2020, 05:52 PM	#5
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	I would stay with the 90mm since you have a larger lower. You will probably be 13 psi with the 90 and 15% lower. Buy a boost gauge or have HP Tuners to data log to know exactly what your boost is. __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

08-13-2020, 09:07 PM	#6
ExorsistzL1 Drives: 2018 zl1 10 speed Join Date: Oct 2018 Location: Georgia Posts: 86	Whats interesting is i 1st ran 80mm and stock lower and was seeing 19 to 21lbs i went to 85mm and still hitting 17 to 18 . I currently have texas speed heads 19 zr1 cam 2650 with 103 nick williams TB AR headers cattless x pipe alky meth DSX low side aux fuel 93 im about to put a cam with 38% lobe so ill drop psi and get off the methanol. ( worried about pump failing on WOT) The kit came with 90mm but i think ill stay with 85mm and hope im around 13 to 14lbs

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