Hi, i have a problem with my Magnuson Supercharger. I put smaller and smaller pulleys, and my maggie gives only 10-11 PSI... My setup now is Overdrive crank pulley ( 8.0") and 2,8" Charger Pulley. Rear Pulleys 1:1.

LS2 Engine with Magnuson Supercharger.

What You think, is it finished? I checked how it looks like today. Se photos:

 

Put a whipple 2.9 on it

 

Make sure that you don't have a light spring bypass actuator on it and it is opening because of inlet depression cased by the throttle. You could disconnect the vacuum line to the bypass for one run to check if it is a problem (don't leave it disconnected though). Are you running an M112 or M122? How much power are you looking to make?

 

Your done.
Trust me ... No more to be had.
At this point by reducing your pulley size your just creating more IATs & probably belt slip.

 

Balancer pinned?

 

I want to make 600HP/800NM...
What You think about photos? The rotors are not much worn out??
What You mean Ballancer pinned? I don't understand.

NitrOmm, what You mean, "Your done"?

 

I would be concerned with the rotors being worn. I suspect that you over revved the blower, which created extra heat and this caused rotors to expand and make contact with the blower case.

LS engines have a press fit balancer and there is no key. With the case of a supercharger, the lower pulley should be pinned (adding a key) in order to keep it from rotating under the load of the supercharger.

http://www.superchargersonline.com/i...ual-hotrod.pdf

See steps 51 for crank pinning instructions.

Andrew

 

Bless you for asking this. I am assuming that English is not your first language because you have Cracow as your location. If I were to ask this same question it would be sarcastic whereas coming from you, I assume it to be an honest one. It is a result of our splendid public education system that so many are typing phonetically ie NitrOmm cannot tell the difference between "your" and the contraction of "you are" which is "you're." In other words I assume he meant to say "You are done" or in other words you are at the limits of the supercharger. Of course if he were to use the proper slang or typing short cut he would have just typed "UR done." You=u and r=are.

 

Now I understand.

Yes, my balancer is Pinned.

My maggie is M122

 

I cannot argue with you ... you're right.
And yes, my point is that the blower is maxed out.

Tony, a few months ago it was suggested that you upgrade to an 8 rib pulley system. From the photo it seems that your are still running the original 6 rib pulley system. There is a strong possibility of belt slip. If that is the case, you may be able to get just a little more out of the blower. My system was very similar to yours and in spite of utilizing the 8 rib system with an 8" OD crank & 2.9 upper pulley, I could not squeeze anymore out of the blower. I cannot remember which cam you have & if you are running headers. Those two components can effect boost level ( which is not horsepower). My point being, I've seen stock motors make a littler more boost than 10 lbs. With that being said, you may have a little room for boost when the belt slip is taken care of. My concern is that your goal of 600 HP may be on the edge of the limits.

Comparing this to my experience: my set up was the same blower, forged LS2, blower cam ( low overlap), heads ( 11.2 CR) & headers. Spraying meth to combat the IAT's. I saw no more than 10.5 lbs boost & made 550HP/500TQ on a Mustang dyno. On a different day & DynoJet dyno ... I may have been a little closer to your target numbers. But that was it.
I was done ( in regard to more HP & blower capabilities).

For me the last option was to add a small shot of N2o. It was a great way to increase just a little more HP when needed. That put me over the 600 HP goal.

You mention the target of 600 HP. Where are you now in re: to HP/TQ.
Is the vehicle not performing as you would like, or are you concerned that the motor has another issue ?

 

Thakns for answer.

What You mean maxed out? ( i don't understand this "maxed out" - sorry I am from Poland ) You mean that this blower is broken?? Tell me is it dangerous to my engine to run it with this maggie?

I have install the 8rib system, the photo in first posts is old. So i think that i don't have the belt slip problem ( and my boost is constant to max RPM )

I have LS9 camshaft, pac 1218 springs, and some drilled input and exhaust ports.

Below I add my best dyne test, and more photos of my blower. Help me, is it ok to put it back to my Engine???

For good drift I need that 600PS and -700-800NM

 

Anyone else besides myself that's worries about the scratches on the case and the rotor tips? Is this just "normal" wear? I wouldn't think so.

Andrew

 

I can't truly speak to that. The scratches don't look good but .... Tony did not mention a vibration or grinding sound. The fact that he is holding 10-11 lbs of boost tells me that the blower is working & doing its job.

 

Tony,
Maxed out = blower is at its maximum limit. There is no further boost to get from this blower. Attached you will find a chart that speaks to pulley size and RPM of the blower. The red exeeds recommended maximum RPM. You are a little over the safe limit.
The fact that you are consistently making & holding 10-11 lbs of boost tells me your blower is working. I believe it is safe to put it back on the car.

Sorry, I don't know how to convert HP & TQ from NM & PS but the chart shows
( what I believe to be ) a good TQ curve. I can tell you with certainty that an LS2 6.0 with this blower on top will be at its maximum limit at 10-11 lbs. boost. The limits of HP will be about 500 - 550 maximum. Typical results range from 450 - 500 HP on mildly modified motor as yours.

 

I should add, the 2.9" or 3" pulley should keep you within the remanded limits.

 

rotor wear doesnt look excessive imo

i had the exact same setup as you. ls2, 122, 1:1 rears, 2.8 upper, 8 inch crank pulley. it made 12 psi

spraying nitrous through it was the only way to make more power
head unit was way overspun passed efficiency

 

Have you done anything with the intake temps? Get those down and add meth injection . This will net you some more. Hp.

 

I have three radiators which cool down the compressor, and on two of them I have fans. Now I have good IAT's ( somewhere about 20* above ambient).

 

Even with good AIT you are just running out of capacity on the blower. The only way to make more power is to increase airflow through the engine. I would consider ported heads (or good aftermarket heads) or more cam...

Andrew

 

That's right about where they should be. Did you notice a difference, power wise?