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what is the ratio of the Vortech FMU?

 
Old 08-02-2007, 11:13 AM
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what is the ratio of the Vortech FMU in Greddy kit?
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Old 08-02-2007, 11:15 AM
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12:1 is stock, as shipped, with the GReddy kit.
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Old 08-02-2007, 03:36 PM
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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, 02:51 AM
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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, 03:56 AM
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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, 04:00 AM
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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, 10:07 AM
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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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