supercharger or turbo ?? help

The Stage-I SC compressor wheel is not only directly connected to the crank it is also internally overdriven 12.67:1 and can be overdriven an additional 1.18:1 with 26/22 pulleys. The Time to Spool from Idle (boost threshold) on the SCs compressor wheel should (figuratively) be light-years ahead of the exhaust gas driven turbos compressor wheel of the same size and flow capabilities. Setup correctly, it shouldn’t be getting beat out of the hole by turbos with the same size and flow. Maybe if the turbo is clutched to engage at 7000rpm but that’s not a real rider friendly setup. Depends on the circumstances I guess.
 
Ironman.

I don't have the same results. My buddy has a turbo RX1 when we raced last week I was quicker out of the hole but he could pull me mid and top. he had 12 lbs and I had 10lbs. I believe the numbers for a GOOD turbo kit is 10 HP per pound of boost and a supercharger is about 9 HP per pound of boost, which give the edge on max power to the turbo, but throttle responce goes to the supercharger. :D

I'm with you HAMMER
 
Take a good look at the MPI dyno test......They stop the test at 9900 rpms!!!!!!!!!! Most guys are running well over 10,500rpms and are getting more psi and HP then what MPI is saying :Rockon: One dyno test that I'm aware of had a 7psi SC at 10,800 making 215 hp and of course more preasure since the 7 psi kit is rated at 10k rpms 8)
 
T or SC

I would presume that during this delay there is some forward motion aka rollout that would help to limit spin - Just fishin for why the T would beat the SC off the line.
 
Silverbullet,
The reason MPI stops at 10,000 is the speed of the supercharger is exceeding its safe operating range and the life expectancy may be compromised. If your need is to make more power/boost then you may want to consider going to a Stage II blower you can spin that unit higher low on a Stage II is 10 lbs. and up to 16lbs. Fuel mapping may, for the time being, hold you down to 12 lbs however.

No games here guys, MPI won't release something they are not comfortable with. I have a Stage II I'm getting ready, as we speak, to put on my dyno for some testing and will keep you all advised with the results. I've been dying to play on the dyno with this all season just been too busy in the shop to do my own stuff. Thanks Greg Santry :D

GNS Enterprises
Custom engine builder
Superflow dyno service
 
TT....I understand that the 10 psi pulleys need to stop at 10k BUT the 7 or 5 psi pulleys should be able to rev higher due to their lower imput speeds 8)
 
Silverbullet,
Yes, your right, sorry misread I spun my Stage I with 6 lb pulley config. at 10,800 worked fine. MPI wants you to hold the 10 lb. config. to 10,000 RPM :D
 
Typical impeller speed is around 150,000 rpm with a max of 180,000. On the 10lb setting, if the engine is spinning at 10,000 the impeller is at 150k. The 9800 rating that MPI pushes is the rating of the actual pullys. If you take a look at them, they are stamped with 'Gates' and 'Max 9500 rpm' I believe.
 
Ran my Stage-I at 157,619 rpm for short runs and you could have fried an egg on the intercooler.

I believe that tells you something about both intercooler and compressor efficiency above 150,000 rpm.
It's overworking both...:exc:
 
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