Thread: Lightweight rotor pack

Once you drill holes in anything you weaken it and make it prone to stress cracks

I'm running a lightweight rotor pack from MACE engineering here in Aus. I can't tell how much the lighter rotors themselves contribute to performance... but when I had them fitted to a brand new blower which was fully ported I gained 32hp up top and about 20 - 25 across the rest of tbhe rev range.
And on the dyno sheet it looks like the limiter could have been raised a bit and got maybe another 5 - 10hp out of it.. I just think my tuner didnt want to spin the stock bottom end too high.
So I do believe they help a bit. Once you make over 300rwhp every hp is hard to come by anyway

Wow, that sounds pretty substantial. Not sure what tbhe means

Think he was trying to type, "the"
Just my guess though, unless he typed that on purpose =P

^ this guy ;P

My brain has been malfunctioning a lot lately

Also how will it effect balance?

I did a fair bit of reading on the topic a while back... came across a thread somewhere where some dude did testing stock vs. drilled out rotors. Cant remember if it was m90 rotors though.. but the principal would be the same I guess... anyway, the drilled lighter rotors showed less flex and vibration.

Also, of the people I know here who are using the MACE Engineering lightweight rotor pack none of them have had any problems. One guy is using a 2.4" pulley and overdriven balancer and even the coating on his rotors is still flawless after a year or so... he's making 450rwhp with the m90 lol

As for myself, ive been using the light weight rotors for a month now.. and no problems as of yet.. and i'm not expecting any dramas at all.

If shipping wasn't so bad I would be willing try one of those rotor packs

how much do they want for shipping?

I'm not sure but international shipping is bad

can't imagine it being much more than a hundred bucks or so...

That's probably about right, a rotor pack shipped here in the states would be about 30 at the most

But to make use of it you'd want to be running a pretty small pulley... on a 3.4" it probably won't make any noticable difference.
The harder you spin the blower the more the HP savings add up exponentially.
here in Aus we a2a cool our m90s, pulleys in the range of 2.4 - 2.55" are common

I'm running a 3.2 pulley and a full size intercooler

full size w2a IC should be able to drop to a 2.8"? Properly tuned of course...