What do you guys think is the smallest pulley can be safely run on a MP122. I have seen pulleys as small as 2.5'' but I hear you have to grind down your blower. Also do you think you would recieve a decent gain in power or can the maggies not flow enough air for it to be worth it?
A 2.5" would be ALOT of boost on a M122............the larger case of the 122 might be able to flow that.....the case of a 112 is too small for that size pulley. I don't know of anyone running a pulley that small on their magnuson.
A 2.5" would be ALOT of boost on a M122............the larger case of the 122 might be able to flow that.....the case of a 112 is too small for that size pulley. I don't know of anyone running a pulley that small on their magnuson.
On a built 408 how much psi do you think it will push out of the 122
Location: Valencia Calif....., 585 RWHP and 567 TQ!!
Quote:
Originally Posted by Bushong572
A 2.5" would be ALOT of boost on a M122............the larger case of the 122 might be able to flow that.....the case of a 112 is too small for that size pulley. I don't know of anyone running a pulley that small on their magnuson.
,I'm down-sizing to a 2.8 in a few weeks on My 112.
well guys
i am running 3.10
and my post is five but my car 520 HP
only with Kooks and cheatr cam
and you can check my signature
almos i think the supercharge can run more then 10 psi
but there is a BOBRING ( sorry i dont know how to spell it )
inside the super
this one may get break
i will ask Lingenfelter and see
because i am also Confused cuz i am running 5psi on pully 3.1 ( should be 8 )
and the guy who i bought the magna from him was running exactly the same and his psi was 8 !
but his number was less then 500 !
any explain ?
__________________ C6 Z51 Package M6
Procharger F1C | Custom camshaft l | AFR 72CC heads | 403 Stroker
FAST 92 MM intake | Wet Nitrous Direct Port ( fogers ) | Headers kooks 1 7/8
X pipe + cutback C6 Zo6 | F1-C 11PSI | Ram Twin Disk | Custom fuel System | 75 Shot if Dry Nitrous on F1-C cooler | ARP STUD | Moizer water Pump | Flip Drive | FAST 92 has killed me by leaking air and losing Boost !
RWHP 720 | RWTQ 725 On Dyno Jet ( with Drifiting on dyno)
Did he have a cam and headers on his car? most likely not...
when you reduce your backpressure, your "boost" will be effectively lowered. You are flowing more air at less boost, thus more efficient. put a smaller pulley, up the boost to about 8 pounds and then see how she flies...
Quote:
Originally Posted by vvette_c6
well guys
i am running 3.10
and my post is five but my car 520 HP
only with Kooks and cheatr cam
and you can check my signature
almos i think the supercharge can run more then 10 psi
but there is a BOBRING ( sorry i dont know how to spell it )
inside the super
this one may get break
i will ask Lingenfelter and see
because i am also Confused cuz i am running 5psi on pully 3.1 ( should be 8 )
and the guy who i bought the magna from him was running exactly the same and his psi was 8 !
but his number was less then 500 !
any explain ?
Mr restoman45
my cam is 215 intake 230 exhust
lift 604 584 and lope 117
do you mean if i have changed my CAMshaft
i will get more post ? is that what you mean ?
if yes ,,, what camshaft you recommend ?
my friend had a camshaft and headers same as me ,,, but his camshaft was different
i will be waiting for your replay
__________________ C6 Z51 Package M6
Procharger F1C | Custom camshaft l | AFR 72CC heads | 403 Stroker
FAST 92 MM intake | Wet Nitrous Direct Port ( fogers ) | Headers kooks 1 7/8
X pipe + cutback C6 Zo6 | F1-C 11PSI | Ram Twin Disk | Custom fuel System | 75 Shot if Dry Nitrous on F1-C cooler | ARP STUD | Moizer water Pump | Flip Drive | FAST 92 has killed me by leaking air and losing Boost !
RWHP 720 | RWTQ 725 On Dyno Jet ( with Drifiting on dyno)
If your friends cam was much smaller it could make a difference, but i dont know about 3psi less when yours already isnt real big with a 117 lsa if that was the only difference between your motors. do you know what his cam specs are? do you both have cats? does one of you have a much better flowing cat back than the other? did either of you have better flowing heads or intake than the other? all of those could make a difference. I think that camshaft is a fine choice for a boosted motor, but i am not a camshaft expert either. with that cam you shouldnt bleed off much boost compared to bigger cam designed for a natural aspirated motor.
if you are making 520 at 5 pounds you are MUCH better off than someone making 500 at 8 pounds. you can put a smaller pulley on, make about 8 pounds of boost, and make more power...make sure you can get enough fuel though
Quote:
Originally Posted by vvette_c6
Mr restoman45
my cam is 215 intake 230 exhust
lift 604 584 and lope 117
do you mean if i have changed my CAMshaft
i will get more post ? is that what you mean ?
if yes ,,, what camshaft you recommend ?
my friend had a camshaft and headers same as me ,,, but his camshaft was different
i will be waiting for your replay
my camshaft is 215 230 Lope 117 lift 604 584 my cutbck and exhust is borla i have kooks headers
his car is cammed with Comp 114 222 228 lift 566 571
both got headers and his exhust is flowmaster
the intake is Linginfelter
i took his blower with everything and install it in my car ,, which is i bought used one
and he boost 8PSI!!
do u think its hooses or Camshaft problem ?
__________________ C6 Z51 Package M6
Procharger F1C | Custom camshaft l | AFR 72CC heads | 403 Stroker
FAST 92 MM intake | Wet Nitrous Direct Port ( fogers ) | Headers kooks 1 7/8
X pipe + cutback C6 Zo6 | F1-C 11PSI | Ram Twin Disk | Custom fuel System | 75 Shot if Dry Nitrous on F1-C cooler | ARP STUD | Moizer water Pump | Flip Drive | FAST 92 has killed me by leaking air and losing Boost !
RWHP 720 | RWTQ 725 On Dyno Jet ( with Drifiting on dyno)
What do you guys think is the smallest pulley can be safely run on a MP122. I have seen pulleys as small as 2.5'' but I hear you have to grind down your blower. Also do you think you would recieve a decent gain in power or can the maggies not flow enough air for it to be worth it?
Thanks
The smallest pulley that we offer is 2.80" diameter. There may be smaller aftermarket pulleys available but, as you mention, you would have to modify the supercharger housing. We wouldn't recommend that.
The manifold pressure produced is a function of rotor speed (which you can establish with proper pulley selection), but it's also a function of engine airflow requirement. In other words, increased displacement, ported cylinder heads, aggressive camshaft profiles, free-flowing exhaust systems, and other factors will all contribute to an engine's demand for increased rotor speed to maintain manifold pressure (boost).
A rule of thumb: Once you establish a baseline maximum boost for any given engine, each 0.100" decrease in pulley diameter will result in an increase of approximately 0.5 psi boost.
Well thats kind of odd. unless you have a bigger motor than he does, or your heads are better, or you dont have cats and he does, I dont really see much else besides maybe a small leak somewhere maybe at one of your hoses? Check them to make sure.
Quote:
Originally Posted by vvette_c6
my camshaft is 215 230 Lope 117 lift 604 584 my cutbck and exhust is borla i have kooks headers
his car is cammed with Comp 114 222 228 lift 566 571
both got headers and his exhust is flowmaster
the intake is Linginfelter
i took his blower with everything and install it in my car ,, which is i bought used one
and he boost 8PSI!!
do u think its hooses or Camshaft problem ?
The smallest pulley that we offer is 2.80" diameter. There may be smaller aftermarket pulleys available but, as you mention, you would have to modify the supercharger housing. We wouldn't recommend that.
The manifold pressure produced is a function of rotor speed (which you can establish with proper pulley selection), but it's also a function of engine airflow requirement. In other words, increased displacement, ported cylinder heads, aggressive camshaft profiles, free-flowing exhaust systems, and other factors will all contribute to an engine's demand for increased rotor speed to maintain manifold pressure (boost).
A rule of thumb: Once you establish a baseline maximum boost for any given engine, each 0.100" decrease in pulley diameter will result in an increase of approximately 0.5 psi boost.
So lets say hypothetically if were looking at a large engine (400+ ci) a blower cam, high flow heads and a high flow exhaust. Do you think that the MP122 with a 2.8'' pulley can support enough boost for this engine to make 8psi? Also lets say a 2.8'' can support 8psi on this setup do you think getting the 2.5'' to work and deliver 10-11psi would make more HP or would the size of the MP122 case cause it to reach it's full potential with the 2.8'' pulley?
Location: Valencia Calif....., 585 RWHP and 567 TQ!!
mcv,...are You saying that when I change My pulley to a 2.8 in a couple of weeks,I "don't" have to do any "grinding" on the 112?
Thanks for the advice!
well guys i changed my cam
222 228 the intake and exhust ,, to make the camshaft open faster
but i think i have one of the pully is not fitted good ,, which is it is moving ,, that could be the problem ,, my hoses all are fine ,,
__________________ C6 Z51 Package M6
Procharger F1C | Custom camshaft l | AFR 72CC heads | 403 Stroker
FAST 92 MM intake | Wet Nitrous Direct Port ( fogers ) | Headers kooks 1 7/8
X pipe + cutback C6 Zo6 | F1-C 11PSI | Ram Twin Disk | Custom fuel System | 75 Shot if Dry Nitrous on F1-C cooler | ARP STUD | Moizer water Pump | Flip Drive | FAST 92 has killed me by leaking air and losing Boost !
RWHP 720 | RWTQ 725 On Dyno Jet ( with Drifiting on dyno)
Corvette Store
Smallest pulley for 122
,I'm down-sizing to a 2.8 in a few weeks on My 112.
