go my route!

5lb Lower!!!

I may sell mine if my truck get totaled

 

"In stock form, the Lightning engine spins the M112 at about 13,000 RPMs at engine redline. The M112 is therefore already being substantially overdriven with the stock pulleys.

With the maximum boost setup tested by Holdener above, the M112 was spinning at 17,672 RPMs--WAY off the chart!"

So, if the Lightning overspins the Eaton from factory, why stop at a 4lb lower? Like I said in an earlier post, it will be interesting to see what Rob02 does when he goes to the track and tries a 4 & 6 lb lower back to back.

 

Blown347Hatch,w ithout a Retune, Rob cannot do that, as he is running a DUB 2.80" Upper Pulley on his Lightning right now and the addition of a 6 lb. Lower Pulley, over the 4 lb. he already is running, he will in fact be overdriving the supercharger.

Needless to say the most, not having a retune to accomodate the added 2 lbs. boost by adding the 6 lb. Lower Pulley to his configuration, he will be running in a not so safe condition.

Hope this helps, as I was the guy who contributed the Upper and lower DUB Supercharger Pulley Units for all of Richard Holdeners testing in FF&MM Magazine, for all 3 Articles on the 4V - 4.6 supercharged engine.

 

Rob is always way safe on the tune side.

 

i'm just taking a random stab at it, but the rotating mass of a 4lb lower is less than the rotating mass of a 6lb lower. in theory wouldn't that allow it to spool up faster, aka take less energy to do so? i don't know all of the technical terms, but an analogy would be running 18s as opposed to (most) 20s on the track. Faster with 18s right? anyone else with more technical knowledge want to back me up on this/disprove this theory?

 

I agree ALSO,

THATS WHY I HAVE TERRY'S 4+2 with the option of 4 + stock
(and switch back and forth)

And IMO, 4+2 DEF gives you boost QUICKER

Thats based on me running it for well over 2-1/2 years now.
I've said it a million times, I make over 10lbs of boost at @ 1/4 throttle when running the 4+2 set up.
AT WOT, GOT DAM CAN YOU SAY AN EASY 15-17 lbs

I don't think OVER SPINNING or OVER HEATING is the correct
way to always look at this. And high RPM may not be directly to blame either. Lets take me for an instance, I'd bet anyone my last buck that ""IF"" I had a built Motor, I could run a 10 with the Eaton and Nitrous, and will prob get to prove that some day In my case spraying sub zero would make the diff,
trying to do it with 10 lbs of boost WOULD BE inefficient, and prob
lift a head trying.

Is more boost faster ??
Quick answer --> YES OF COURSE <--

Is there a such thing as Too Much Boost
Quick answer --> YES OF COURSE <--

Can you over Spin and Over Heat the Eaton as a result
Quick answer --> YES OF COURSE <--

Does RPM effect this
Quick answer --> MAYBE <--

What I do know is, with a 4lb lower, the Cool Air Induction,
the Mother of all Ports, and the Upper, "on top of the MOST n20 I've ever sprayed", when I looked down a few weeks ago @ the 1000FT mark, HOLY SCHITT did I have MORE boost than I felt
was safe at the moment. (THIS IS ONE OF THOSE TIMES I FEEL
I CAN RUN AS GOOD OR FASTER WITH 4LBS ONLY)
I hope to prove that Friday. To tell you the truth, I kind of had one eye closed just waiting for IT to happen. I'm not saying
my boost is getting inefficient, I just think too much is looking for trouble "at those moments" and I can run as good or better AND SAFER with less, "at those moments" On the street I will always
run 4+2 and benefit from it. (But in the winter I do only run 4)

As I've always said, there is CLEARLY two sides to this.
People like Gator, V, and thousands of others have proved
"FOR YEARS" that Boost along can give you a consistant 11 sec L,
so we know more boost ='s better ET's Right ???
Yes for people with the proper and Modified Cooling Systems to
make use of all that Boost, WITHOUT making it nothing but hot
air.

BUT
For idiots like I was back in early 02, who would drive on the parkway to the track, immediatly tech in and keep the truck running all through it, AND in the staging lanes with the A/C on (because it was 85 degrees out), and then make immediate passes, SOMETIMES ONLY MINUTES APART.
Times like this, in the Hot Summer Heat, the extra Boost can
actually working against you, if you dont have cooling Mods,
or do proper cool downs like I WASN'T

Blown ,
I don't think I can directly point a finger at RPM,
IMO 6lbs is totally efficient in most situations, but any more
and I think you will not benefit without the proper Cooling Mods

 

Nicely said Rob

 

We are talking grams here. The marginal weight of a larger aluminum ring hung on the end of a 10-lb crank assembly is a nonfactor.

 

Good point. Also note that the spinning crankshaft which the lower pulley bolts to weighs over 100lbs by itself. The weight difference of the lower pulley would never show up on the dyno.