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Old 08-02-2007, 12:13 PM   #1
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Default what is the ratio of the Vortech FMU?

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what is the ratio of the Vortech FMU in Greddy kit?
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Old 08-02-2007, 12:15 PM   #2
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12:1 is stock, as shipped, with the GReddy kit.
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Old 08-02-2007, 04:36 PM   #3
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Adjustment is done by replacing the disc and spacer inside the unit, as per http://www.vortechsuperchargers.com/...p=31&cat_key=5
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Old 08-03-2007, 03:51 AM   #4
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if i have replaced fuel pump, do i have to go lower ratio FMU?
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Old 08-03-2007, 04:56 AM   #5
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Shouldn't have too unless your boost tune was on a weak pump.
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Old 08-03-2007, 05:00 AM   #6
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Please, Correct me if im wrong.
The 12:1 Disc is the most agressive. So it will depend exactly on Which fuel pump you go with, HP or Not HP, Injector Size Etc. I belive in scotts Faq there is a formula so you can figure out how much Psi of fuel you want at the rail for a certain amount of boost with your chosen injectors. But I dont remember.
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Old 08-03-2007, 11:07 AM   #7
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Quote:
Originally Posted by lazzer408 View Post
Shouldn't have too unless your boost tune was on a weak pump.
Or on a pump that had a much lower maximum pressure. If the 12:1 disc was taking your old pump to its maximum(Like a stock pump would be at ~80psi max), and you added a 190LPH HP pump, you would be running much too much pressure above 5psi of boost or below 12psi of boost.
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