Supercharger
08-05-2012, 02:01 PM
#31
Registered User
Thread Starter
Good to know. I was planning on overdriving the heck out of mine but don't have the ratios worked out yet.
08-06-2012, 01:15 AM
#32
Registered User
Join Date: Jan 2012
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
i believe 14k s/c rpm is safe, and 16k is doable but heat n reliability start mattering.
Thats what ford guys have said, but were feeding it psi and have large i/cs so depends on when you want x amout of boost and how safe ya want to play up top.
Thats what ford guys have said, but were feeding it psi and have large i/cs so depends on when you want x amout of boost and how safe ya want to play up top.
08-06-2012, 10:12 AM
#33
Registered User
Thread Starter
That's great info, thanks!
08-07-2012, 01:42 PM
#35
Registered User
Thread Starter
I haven't seen the map for the M90, but I would guess the map will be similar. Looks like I need about a 7K speed limit.
08-08-2012, 12:26 PM
#36
Registered User
Join Date: Jan 2012
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
stock mustang pulley ratios pull the m112 all the way to 14k in stock form. "Stock pulley @ 6500 rpm blower rpm is 13535" These guys arent afraid to spin these at 21k rpm with supporting mods.
i know that contradicts your map a little
i know that contradicts your map a little
08-08-2012, 01:02 PM
#37
Registered User
Thread Starter
I was thinking about welding a second alternator pulley on and just driving from that, but I have to figure out the ratio first.
08-08-2012, 07:21 PM
#40
Registered User
Thread Starter
I will have a 1.77 ratio with my setup, which means 5,300 RPM blower speed at 3,000 RPM. That will probably be under boosted, but it's a good starting point maybe. What do you guys think?
Although, maybe it'll be perfect.
Although, maybe it'll be perfect.
08-08-2012, 08:08 PM
#41
Registered User
Thread Starter
Oops, I needed to multiply 2.6 * .833...
It's actually 2.17:1
I'm math challenged....
That will give me a 6,500 at 3,000 crank speed. That should be actually perfect.
It's actually 2.17:1
I'm math challenged....
That will give me a 6,500 at 3,000 crank speed. That should be actually perfect.
08-08-2012, 08:34 PM
#42
Consistant pessimist here again...
The blower moves 90 cu inches of air per rotation.
your engine displaces 180 cubic inches per rotation.(-some ve)
an approx 2:1 ratio will only get you to about atmospheric pressure. You can do that without a blower.
The blower moves 90 cu inches of air per rotation.
your engine displaces 180 cubic inches per rotation.(-some ve)
an approx 2:1 ratio will only get you to about atmospheric pressure. You can do that without a blower.