Real dyno results on modified 3 valve 5.4 V8?

renjaminfranlkn · May 10, 2020

I'm skeptical of claims of torque + horsepower gains on modern normally aspirated engines like the 5.4 V8 I have in my 2010 expedition.

Say i'm willing to spend up to 1k on parts and up to 10 hours labor (i'm doing it myself but I don't want to spend more than a weekend dealing w it). Everything on the table.. tune, pulleys, headers, intake... gotta run on 87 octane with no highway mpg reduction.

Can I get a legitimate HP+ torque increase, and are there any independent tests available?

JExpedition07 · May 10, 2020

You aren’t making any big power increases on 87 octane if you aren’t going to buy premium gas. Slight gains are seen with 91+ octane tunes @25 horsepower or so. I suppose you could gain some power with 87 but imo it isn’t worth the $$ and time you’ll sink in. The stock intake is about as good as it gets for torque. Headers and tune will be doing the most on that list.

Adieu · May 11, 2020

Without a turbo or supercharger, it's not gonna give you any significant gains

It's already crazy fast for a six-and-a-half-foot tall brick. Plenty of power to merge, accelerate, switch lanes, pass, easily spins tires, etc.

If yours hesitates and doesnt accelerate, you need a tune up not a tune

grumpyoldude · Jun 2, 2020

change the rear ratio, biggest gain in feel

Real dyno results on modified 3 valve 5.4 V8?

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