Here's a question I see asked frequently. How much boost does your car make? So instead of asking how much MY car makes, I thought of a better idea. How much boost does an Eaton M90 make with a 3.8" pulley? How about a 3.5? 3.4? So on and so forth. This thread can be a reference for those of us who want to know.

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2012 Ford Focus SE Sport
2012 MINI Cooper Clubman

I have ADHD and drive a Focus. Ironically.
Although gold dust is precious, when it gets in your eyes, it obstructs your vision.

Its gonna be different from car to car. I have a local guy was hitting 13-14 lbs on a 3.4 where I was seeing 10lbs on a 3.4. lots of differences to factor in exhaust work, intake work, etc and which M90 gen 3 or gev V.

I hit 12.5-13 lbs on a Gen V 2.75 pulley

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15 lbs on a Gen V 3.8... But were think valve float may be causing this so LS6 springs and retainers are going on.

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GPDIY - For All Your DIY Needs
VS CAM|3.4|HEADERS|FWI|42.5#|HPT|6000k LOWS|8000k FOGS|

it depends on the specific setup...i have a 2.9" on a genV and see 10-11 lbs of boost. if you put a 2.9" pulley on a completely stock car with a gen V you will probably see 20+ lbs and blow everything to pieces.... like it was said above, camshaft choice cylinder head flow, exhaust flow charge temps etc etc all have an affect on boost levels.

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1997 GTP L36, NIC cam, genV, ZZP headers, N*, 42#'s,
359.6 WHP
12.11@111 1.72 60' without genV or zzp headers

I have been trying to see what KR I have. Tried the Droid with Torque ap, didn't show anything. I bought an aeroforce gauge. Didn't show anything. I've been showing 11.2 boost on both gauges. This morning, 34 degrees outside, on the aeroforce I hit 13 lbs of boost and as much as 4.5 to 5.0 in KR. I'll try it again when it warms up outside. Opinions?

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'05 Grand Prix GTP Comp G. PLOG, 3" DP, ZZP PCM, K&N Drop in Filter, ZZP strut braces,
10.4 wires, cooler plugs, 3.5 dual SS tips, SPO Spoiler, 180 thermostat, ZZP MPS 3.6 pulley,
F-Body brakes, 18" Moda wheels with 235/50ZR18 Conti DW..

The cold weather will increase knock, because it messes with the tune, and cold air requires more fuel.

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One Big Ass Mistake America

3.2Lbs on a stock setup .... but I think I got a bad BBV gonna be changing that today or tomorrow so we will see

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I was seeing about 11.5 with the 3.8 and 14.7 with the 3.5. Now without changing anything, I'm around 11-12 with the 3.5. Go figure.

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

Isn't each drop 2-3lb of boost?



Pulley Suggestions Per ZZP:
97-03 Grand Prix & 04+ supercharged Impala & Monte Carlo SS
3.5 pulley totally stock car
3.4 pulley Colder Tstat & spark plugs, downpipe, Cold air intake (still could have KR)
3.3 pulley all of the above plus a VS cam, SS intercooler, or headers
3.2 pulley 3.4 mods and a XP cam
3.0 pulley 3.4 mods and a fullsize intercooler or an SS ic and a VS cam.
Anything smaller than a 3.0 pulley will require a camshaft, headers, intercooler & injectors.



04-05 GTP or Comp G & 06 GT supercharged
3.8 pulley totally stock car
3.6 pulley Colder Tstat & spark plugs, downpipe, Cold air intake (still could have KR)
3.4 pulley all of the above plus a VS cam, or SS intercooler
3.3 pulley 3.4 mods and a XP cam
3.2 pulley 3.4 mods and a fullsize intercooler or an SS ic and a VS cam.
Anything smaller than a 3.0 pulley will require a camshaft, headers, intercooler & injectors.

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I have a stock 97 GTP I hit 9Psi on a cold day

my buddy's bonnie with a 3.5 or 3.6 (i dont remember) otherwise stock is close to 10

my 3.0 (cam,headers ect.) i hit about 12

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

Since the BBV change i'm at 4lbs

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