Quote:
Originally Posted by justjames80
The 5.4L will spool up a 76mm faster than a 6.0L. It's not the difference in cubes...it's the difference in stroke that's key. I wouldn't be concerned about lag running a single PT88 on a stock headed 5.4L. If keeping with a budget build then look at the Borg Warner turbos. T6 flanged 75mm turbo for less than $600 brand new if you don't shop around. Support all the power you could want and are very durable. Definitely the route I'm going with my truck.
|
The 6.0 is a push rod motor and 5.4 will not spool faster with stock 3v heads. Pretty bold statement for for an engine that moves less volume of air through cylinder heads that flow almost 100 cfm less. That's what spools turbos, volume. The more air that leaves given cylinder during exh. stroke, the faster the turbo will spool.
We did a 88mm on a stroked 4v Cobra Aluminator motor in my shop a few months back and through stock cams with virtually no overlap, spooled at almost 4000rpm. That's why I asked the the question, how much power do you want to achieve? An 88mm will definitely make more power, but if 6-700hp is what you want, then an 88 would be a stupid choice when a 76 will make that,(Mine dyno'd 645@ 10psi.) and spool sooner which is what you want for the street. All I have to do is take off my 76 and bolt on the 88, but it would be pointless because even running around with slicks, I still can't put the power to the ground, and it takes longer to spool. And the 76 makes more power than I can put down on pump gas.
And definitely stay away from the El cheapos and stick with the more efficient turbos like Garrett and Turbonetics. If you want to spend a little more on the ball bearing turbos, they will come in a hair quicker but they don't make any more power.