Picked of a 09 srt8 6.1 with a forged internals, cam, all supporting mods and a tvs2300. It has kooks 1 7/8 headers, catless to 3” exhaust. The Maggie has a 2.8 griptec pulley but the car won’t boost past 5psi. Any thoughts as to why it won’t boost any higher? Engine I believe was built by Arrington. I know it has upgraded fuel pump, braided fuel line, FPR bigger rails and injectors. I checked for vacuum leaks haven’t found any.
slickwillie
6.1 boost question
Picked of a 09 srt8 6.1 with a forged internals, cam, all supporting mods and a tvs2300. It has kooks 1 7/8 headers, catless to 3” exhaust. The Maggie has a 2.8 griptec pulley but the car won’t boost past 5psi. Any thoughts as to why it won’t boost any higher? Engine I believe was built by Arrington. I know it has upgraded fuel pump, braided fuel line, FPR bigger rails and injectors. I checked for vacuum leaks haven’t found any.
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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.
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.
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.
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.
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.
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