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cliff67 04-05-2018 06:39 PM

Speedmaster downdraft
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Hello is anyone running a speedmaster downdraft injection system.

YoungPup1977 04-05-2018 07:35 PM

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 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....

cliff67 04-05-2018 07:53 PM

Re: Speedmaster downdraft
ya I agree it sure has eye appeal and I never liked the way my stock ls intake looked

Bigdav160 04-06-2018 10:35 AM

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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