Thread: Cam or rockers? Topswap or HV3?

This ^^^^^

i disagree with installing a cam or rockers equal improved mpg. yes they allow more air, but with this comes more fuel. flow mods that do increase mpg are fixing flow restrictions. like headers, air intake, TB, porting of tb, LIM, heads. these allow the car to breath easier. cam and rockers cause the car to breath more... the only explanation i can think that would justify that a cam or rockers make better mpg is that they improve the usable power range. or that without proper fueling you are now getting more air at a lower rpm/tp% and the car is now leaner.

if mpg is a concern, then your first major mods should be a wide band and tuner. you can aim for a safe conservative AF and then plan other mods from there.

Originally Posted by Z34Phoenix

...the only explanation i can think that would justify that a cam or rockers make better mpg is that they improve the usable power range....

Thats what I just said... There are plenty of 3.8s that are cammed or have rockers that are pulling upwards of 5mpg more than stock

What's a factory GTP rated at on the highway?

Also...

Ported heads and headers help a ton on the MPG side...FLOW FLOW FLOW.

I saw 29 MPG AVERAGE on the way to the Iowa meet last year.

Lean burn cruise tuning anyone?

Exactly.

440+ miles to a tank FTW.

Originally Posted by Kolton Lock

A stronger trans than the gtp, it's not the HD, or am I just being an idiot?

Yes to the last part.

The better question. What would ever lead you to believe the GT trans is better?!

it has a better gear ratio

Not nesc.

yep.