Thunder Racing had their grand opening today (new shop). They had a dyno day also.

Since my car is down for a new low-compression all-forged 383, I decided to dyno my work truck, a 2000 Lightning, stock with 62,000 miles.

First pull: 433 ft lb and 347 rwhp.

I removed the air filter (a cone K&N) from the MAF and. . .

Second pull: 400 ft lb and 305 rwhp.

Guess it liked the grimy old filter in place. . .


My brother dyno'd his 2003 Cobra with 200 miles (bought new last Tuesday). It did 350 rwhp.

Mike

 

It's the MAF that makes the difference

 

I don't follow. I left the MAF in place, along with a 3.5" tube on the inlet of it.

 

so what was the cause of the lost power?

 

That is extremely weird. Do you think it may have been picking up too much heat without a filter? How is your intake pipe routed? People tend to make more boost without an intake pipe. This is due to not have the restriction on the orange flex hose.

 

The air inlet pulls from the same location with and without the filter.

My theory is that either:

a) The sharp entry into the pipe causes a restriction, or
b) Ltrims had adjusted to the filter being in place, so removing it caused the A/F ratio to be off.

Also, Eaton supercharged Fords usually lose 10 rwhp from one run to the next due to heating of the water in the intercooler. That accounts for 10 of the 40 lost hp.

Mike

 

A common trick on supercharged mustangs is to twist the MAF. Usually done on 5.0 motors, but there is truth to the craziness. Twist it one way to lean, the other to richen it up. I guess its the way the air hits the sample tube or wire.