Don't know, but the L's sure are fast.....from what I've been told, faster than a RCSB with a Radix. Maybe it's forged and lower compression to start with, which makes it easier to run more boost. And since it's a smaller motor (4.6L?), more potential for boost as well, right? Like 15+ psi from what I remember....

 

i'm not sure about them being all that much faster on average. I mean there was a L at the track with motor work and 14psi running high 11s@114mph. I don't see why a similarly equipt RCSB 5.3L wouldn't do the same or better.

 

Pretty sure they are 5.4L. Is it possible that the L guys can change upper and lower pulleys to get more boost out of the unit where you can only get 10# or so from the Radix before it starts to slip???

 

any slip is due more to the size of the pulley your running rather than boost.
If you are experiencing slip, there are remedies.

 

So, the question I have now is....how can you have 13-15 psi going through a 5.4L (Ford) but nothing close to that going through a 5.3L (Chevy) with the same blower (Eaton 112 ci)? What's going on?

And all this bragging about how the MP112 is more efficient.....if this is the case, where is all this extra boost/power going? If the L truly has a 5.4L, then there is no disparaty in displacement, so the difference in boost is not explained here. Why the difference between the two?

 

The L and Kobra motors are built for the blowers. And they run more boost on them because of the stronger internals. Guess you could try and punch 13 into a stock 5.3 and see what happens.

 

Remember boost is a measure of resistance....or pressure, hence PSI. Now lets say you have 10psi, then you add headers. Most likely your boost will drop, put your power will increase. You can't compare two totally different motors like this. A pushrod OHV 5.3 vs. a OHC 5.4 with two different blowers is like comparing apples and oranges. Especially since one engine is built for boost.

Also, who says L guys aren't spinning the blower out of its efficiency range. Boost is just like nitrous, it gets addicting and people get greedy. I'm sure a lot of them are spining them hella hard to get 15psi, but who cares if its effciency is 50%.

BTW, I don't think the M112 has the twisted rotors, so some of the MP112's efficiency comes from that.

 

Just asking.

Would like to hear from the horse's mouth here...

So if the MP112 is more efficient, then why isn't it making more boost and more power?

This is exactly the kind of discussion I was hoping to have with L guys in the house....the reason this board was created (I would think). So where are they?

 

lightnings.com???

 

There is not any need to port a Radix, the Radix is already s ported for performance.