Probably Arrington tuned it to be safe?

That same 2.8 pulley on my 5.7 would supposedly be 12psi which is way past what it could/should run as I am running a 3.2 which is supposed to be a 8lb pulley, and it actually tested does reach 8psi at 6K rpm.

I met a Challenger owner with a 6.4L stock engine running the TVS 2300 with the 3.2 pulley and I asked him about it since the 6.4 is not supposed to safely run 8psi.
He told me Steve White installed the Magnuson for him and told him the tune was dialed back so he would not have problems running the 3.2 pulley.

So that's why I said it is probably tuned that way.

Just an observation it makes little sense to me to run the 2.8 pulley and seriously dial back the tune, because spinning the Magnuson all the time at higher rpms is definitely going to shorten its life span. I feel that Magnuson also takes into consideration how long their product is expected to last when they factory install the pulleys in relation to the lower engine pulley versus the speed of the impellers.

Tested they know exactly how fast the impellers are spinning at the pulley size and how long time wise they can endure that, bearing wise etc..

Seeing as how if bought straight from Magnuson there could have been a 3 year warranty on the blower, the only way they could safely do that is by knowing the MTBF (mean time before failure), taking the tested spin rate of the impellers into account.

The smaller the pulley the faster the impellers spin inside the blower casing.

I don't think many actually think about that in their quest for more power, just Ohh Ahh just a pulley swap and more power, to hell with the consequences.

 

Probably Arrington tuned it to be safe?

That same 2.8 pulley on my 5.7 would supposedly be 12psi which is way past what it could/should run as I am running a 3.2 which is supposed to be a 8lb pulley, and it actually tested does reach 8psi at 6K rpm.

I met a Challenger owner with a 6.4L stock engine running the TVS 2300 with the 3.2 pulley and I asked him about it since the 6.4 is not supposed to safely run 8psi.
He told me Steve White installed the Magnuson for him and told him the tune was dialed back so he would not have problems running the 3.2 pulley.

So that's why I said it is probably tuned that way.

Just an observation it makes little sense to me to run the 2.8 pulley and seriously dial back the tune, because spinning the Magnuson all the time at higher rpms is definitely going to shorten its life span. I feel that Magnuson also takes into consideration how long their product is expected to last when they factory install the pulleys in relation to the lower engine pulley versus the speed of the impellers.

Tested they know exactly how fast the impellers are spinning at the pulley size and how long time wise they can endure that, bearing wise etc..

Seeing as how if bought straight from Magnuson there could have been a 3 year warranty on the blower, the only way they could safely do that is by knowing the MTBF (mean time before failure), taking the tested spin rate of the impellers into account.

The smaller the pulley the faster the impellers spin inside the blower casing.

I don't think many actually think about that in their quest for more power, just Ohh Ahh just a pulley swap and more power, to hell with the consequences.

Yeah, and then it gets fixed...

 

It could be that it has a boost controller.
Possibly an underdrive crank damper. possibly the bypass is not functioning correctly. could be your boost gauge itself has a leak so it's not reading properly.
Belt slippage ( doesn't always squeal)
Leaking or worn out seals on the sc itself.


if the engine is stroked/ bored to a larger displacement will lower boost level "some". Ported heads and headers will also loose "some" boost is just a measure of resistance. Calling something " X lb." Pulley is a jumping off point . But I wouldn't think that would drop it to that degree.

 

May be your air filter, looks pretty nasty in the picture?

 

What's the condition of the SC belt?

 

Brand new green HD belt.

 

Could your boost guage be bad?

Has it always read 5 psi or is this something new?

 

Not sure. Previous owner said he seen 8psi.

 

You'll only see Max boost at redline. Remember as well boost is just a measurement of resistance. While your SC may be flowing what would be 10lbs on a stock engine. It will be less with a higher flowing engine.

 

Thank you!