Holley EFI System - A Stroke Of Efi Genius

We Test The Hye-Tech Performance 391 Stroker With Holley's New EFI

Sucp_0211_11_z Holley_efi_system Seal 1/17

Two gaskets are supplied to seal the plenum to the base. Don't use any sealer on them. Just four stainless steel bolts are needed to hold the top down.

The cool thing about tuning an EFI motor is that you do it while the engine is running. Also, the perfect tune-up is usually just a few keystrokes away, but it may take a while to get there if you're not careful. That's because it's just as easy to go way off base with your fuel map as it is to get the thing right in a matter of minutes. Holley has gone to great lengths to supply what it feels will be a reasonable fuel map for each particular EFI kit, but just like with a carburetor, there's always some power to be found with tuning somewhere. However, unlike tuning a carb with traditional jets and air bleeds, tuning EFI takes only seconds, and the results can be felt instantly.

In the end, this stroker Mouse made some great power, and the fact that it idled incredibly smooth at just around 600 rpm points to its being a great daily driver.

Sucp_0211_12_z Holley_efi_system Throttle_adjustment 2/17

The throttle position sensor (TPS) goes on the side of the throttle body and tells the computer how far the throttle blades are open. This can be roughly translated into how much power your foot wants the engine to make.

Sources

JE Pistons
Huntington Beach, CA 92649
714-898-9763
www.jepistons.com
Holley Performance Products
Bowling Green, KY 42101
270-781-9741
http://www.holley.com
Vrbancic Brothers Racing
909-930-9980
www.customcarbs.com
Total Seal
Phoenix, AZ
(800) 874-2753
totalseal.com
Hye-Tech Performance
La Puente, CA 91746
C.A.T. Power engine parts
Baldwin Park, CA 91706

MORE PHOTOS

VIEW FULL GALLERY

COMMENTS

subscribe to the magazine

get digital get print
TO TOP