Why is it that our M45 blowers on LD9's cant push furthur then 10psi efficiently? After finding out that the Mini Cooper S uses an M45 stock, I was surprised to see that they are pushing boost levels of 15psi and up by changing pulleys. Those cars are 1.6 SOHC's, 8.5:1 compression ratio, and they have a water pump running off the S/C. I honestly dont understand why our LD9's dont even come near those boost levels. I understand the MINIs have intercoolers mated to the M45 (sucks that GM couldnt be that innovative) yet im still suprised how the M45 can spin as fast as yielding 18 psi! Is there something were missing?
Seriously, alot of people tell me the M45 was a waste of money, but there are some MINI's out there with it who are running 13s in the 1/4 mile and pushing 230hp+ with no juice. I honestly thought the 2.5 pulley was pushing it!! Has anyone ever screwed up an M45 blower?
Link to Mini forum
http://www.northamericanmotoring.com/forums/showthread.php?t=87457&highlight=psi
Boost is only a measure of resistance. The 2.4 flows more air than the 1.6 so the blower builds less pressure. As you do more mods with the 2.4L such as head/cams/exhaust and allow it to flow even more air than it did stock the boost pressure would go down even more. I'm sure the mini is a lighter car so that helps with the 1/4 mile times.
I don't think anyone said it's a waste of money. However if you have high power goals the M45 simply won't cut it. It has a limit and it's not upgradeable like a turbo...
12.770 @ 111.99 Intercooled Eaton M62
math...1.6L allows the M45 to build more boost due to the motor not being able to take all of it.
The 18 psi they are talking about on there would result in a lower numbers and higher heat (due to the efficiency dropping) on the 2.2L or the 2.4L
It works like the M90 on the 2.3L Quad4. With the stock pulley (3" dia. from a T-bird) retained on the motor and the supercharger, the boost number rockets up to 24psi. With the motor stroked to 2.6L, the boost drops to 22psi, no changes to the pulley size. Those numbers are with the stock pulley, so efficiency should also climb.
The M45 is a pump, just like a turbo, or even a water pump. if you restrict the flow (to a point), the pressure will rise, but the resulting output with also rise.
Theres a guy on the quad4 forums running 2 M90s on a modified 2.3L estimates are in the 60PSI+ range on several calculators.
sunfiresam wrote:Why is it that our M45 blowers on LD9's cant push furthur then 10psi efficiently? After finding out that the Mini Cooper S uses an M45 stock, I was surprised to see that they are pushing boost levels of 15psi and up by changing pulleys. Those cars are 1.6 SOHC's, 8.5:1 compression ratio, and they have a water pump running off the S/C. I honestly dont understand why our LD9's dont even come near those boost levels. I understand the MINIs have intercoolers mated to the M45 (sucks that GM couldnt be that innovative) yet im still suprised how the M45 can spin as fast as yielding 18 psi! Is there something were missing?
Seriously, alot of people tell me the M45 was a waste of money, but there are some MINI's out there with it who are running 13s in the 1/4 mile and pushing 230hp+ with no juice. I honestly thought the 2.5 pulley was pushing it!! Has anyone ever screwed up an M45 blower?
Link to Mini forum
http://www.northamericanmotoring.com/forums/showthread.php?t=87457&highlight=psi
Send me links to the 230+whp guys. I just searched the site and the best i found was.
Quote:
the record holder is 228whp at 8k rpm with a perfect tune done on the dyno and a laptop when driving around.
quickest and fastest non-turbo, non nitrous assisted MINI 13.2@105.5
- 93 mph in the 1/8 mile
Member of J-Body Of Michigan.
hmmmmm..... CFM is what you should be talking about..CFM.. not pis the higher flow cfm of the charger is what you want to talk about.. psi is the extra air the engine can not displace at that time.
horsepower is how hard you hit the wall, Torque is how far you push the wall with you
Josh Csepegi (CUYOTE) wrote:hmmmmm..... CFM is what you should be talking about..CFM.. not pis the higher flow cfm of the charger is what you want to talk about.. psi is the extra air the engine can not displace at that time.
higher PSI due to the engine flowing a lower CFM with the M45 flowing the same CFM. 1.6L will never flow as much as a 2.4L, hence the higher PSI in the 1.6L.
