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Old 04-05-2018, 06:39 PM   #1
cliff67
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Speedmaster downdraft

Hello is anyone running a speedmaster downdraft injection system.
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Old 04-05-2018, 07:35 PM   #2
YoungPup1977
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Re: Speedmaster downdraft

Its to good looking to have a hood over it covering it up...this injection system belongs on a vehicle that is open in the engine compartment, my opinion only....it sure is pretty......I installed a Holley EFI sniper on my 1972 blazer 4x4, for the money I think I made the right choice....I was not impressed with the HP increase on the speedmaster downdraft injection system but it sure looks great....
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Old 04-05-2018, 07:53 PM   #3
cliff67
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Re: Speedmaster downdraft

ya I agree it sure has eye appeal and I never liked the way my stock ls intake looked
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Old 04-06-2018, 10:35 AM   #4
Bigdav160
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Re: Speedmaster downdraft

I bought one for a Ford 302 on close out. I paid about $400. Intake, throttle bodies, stacks, and fuel rails.

While you can't see it there is a common plenum connected via 1/4 holes to the individual throttle openings for a good vacuum signal (MAP)

There's also individual vacuum ports on each of the throttle bodies to help balance the throttle openings. I am using a megasquirt/microsquirt for a controller. I planned on installing it in my '50 Ford coupe but other projects keep getting in the way.

ooops, it that for an LS? No common plenum for that setup.
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