Spinning an MP122 fast?
07-31-2010, 06:14 AM
#11
According to that chart boost pressure is a greater factor than rotor speed in heat BUT thats a tvs chart, the HH group is efficient but not as much as the TVS obviously. If his 122 follows about the same path obviously the spike in iat is going to be more pronounced as boost pressure goes up.
In short with your setup if it has a chart close to the tvs you should be fine at the boost pressure you will theoretically be running. Only problem i see with the 2.6 is belt slip since I believe youre still on a 6 rib setup.
In short with your setup if it has a chart close to the tvs you should be fine at the boost pressure you will theoretically be running. Only problem i see with the 2.6 is belt slip since I believe youre still on a 6 rib setup.
07-31-2010, 07:18 AM
#12
The new motor is in the truck and running. The 2.6" pulley installed. I ordered a 2.7" pulley also, but the outfit I bought them from shipped the 2.7 with the wrong shaft hole. The 2.6 has the correct hole.
Yes, I'm still 6 rib. If the boost is the same as before, would the belt load be similar? I know the smaller pulley has less for the belt to grab. Hoping to get away with it if I keep the boost under 9psi.
Truck is at Allen Nelson's shop for tune tweaks and fuel pump upgrade. I'll let you guys know how it turns out. It took him weeks of test driving my vette before he got the tune right.
Hope this one isn't "tested" quite as much....
Yes, I'm still 6 rib. If the boost is the same as before, would the belt load be similar? I know the smaller pulley has less for the belt to grab. Hoping to get away with it if I keep the boost under 9psi.
Truck is at Allen Nelson's shop for tune tweaks and fuel pump upgrade. I'll let you guys know how it turns out. It took him weeks of test driving my vette before he got the tune right.
Hope this one isn't "tested" quite as much....
08-01-2010, 11:28 PM
#15
If he is was only pushing 5 or 6 lbs of boost, I doubt he would get much slip even with a 2.6" pulley. The belt slips because most of the time, when you use a smaller pulley the boost is increased as well. Drive power is directly proportional to boost level. And of course the surface area of the pulley on the belt is smaller with the smaller pulley so that just makes it worse, but the difference in driver power resulting from the boost increase is the main cause of slip.
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