Dyno'd New Engine

[devincox]

Last year I bought a long block from Modular Head Shop for my 97 EB 4wd. The stage 1, 5.4 with ported PI heads. I had a hard time finding someone to tune the engine. Nobody around Oklahoma wanted to purchase the equipment to tune the older fords with the SCT tuner. I finally found a guy, Bo at APS, and he tuned the engine for me this week.

Specs:
Mild-ish bullet cams
24lb inj
K&N cold air
99 stock expedition intake
BBK Ceramic coated 1 5/8" shorty headers
Gibson high flow cats and pipes
Gibson exhaust

It made 228HP / 345TQ to the wheels. Max torque happens at 3250rpms. The HP is a little lower than I expected (I figured it would be around 250HP) but the torque is right where I expected it to be.

I'm taking it get 4.56's next week and then some paint. It should be a decently responsive yet dependable ride once the 4.56 gears are in.

 

[stamp11127]

To quote Smokey Yunick "horsepower sells engines - torque wins races"...

 

[ExplorerTom]

You're putting down 2 less HP and 20 more TQ at the wheels than what the engine was rated for at the crankshaft.

Not bad.

 

[rjdelp7]

Why would you take time and spend money to "dyno" this motor? The 5.4l is not a HiPo motor, it is a work horse. 228hp is pathetic, for that displacement.

 

[devincox]

I guess I should have titled it "Dyno Tuned new engine". You don't have to tune on a dyno but it safer and easier. I don't care about the HP numbers, I wanted some torque to haul a boat and for the truck to move more quickly when merging into traffic. Which with 345TQ to the rear wheels it does just that.

 

[ExplorerTom]

And if you go with 4.56 gears it'll really move.

 

[devincox]

I'm having a hard time deciding on 4.56 or 4.88 for the gears. I like to travel in this and not sure if 4.88's and 31" tires are a good fit for the highway.

 

[ExplorerTom]

4.56s and 31s won't be good on the highway. I had 4.56s and 30s on my Explorer. It would leap away from a stoplight but going over 70 mph seemed like pushing it.

33s and 4.56 are pretty close to an effective ratio of 4.10. Is 4.30 available for your axles?

 

[devincox]

I put some values in an rpm calculator:
3.73 @ 75mph = 2122 RPM
4.30 @ 75mph = 2400 RPM
4.56 @ 75mph = 2595 RPM

2595RPM's @ 75MPH is a little high.

 

[reece146]

3.73s or 4.10s.

Take a look at what the rpms are when the trans is in direct drive for towing. I kinda hate towing with my Cherokee (32s and 4.56).