Brother just bought a used 300C SRT8 and wants to install a GCM supercharger

[vvv90]

Originally Posted by NYC_SRT8

I bet neither of you guys had a 9th injector wedged in between the throttle body and the intake manifold shooting gas in a place where it was never meant to be...

Nope!

Did it the right way with larger injectors and tuning.

[NYC_SRT8]

Originally Posted by vvv90

Nope!

Did it the right way with larger injectors and tuning.

As I thought...

[mjr5150]

Shortcuts usually fall where they belong....directly on there face.... . Must have been a mean ride.....that vette.....

Originally Posted by vvv90

Nope!

Did it the right way with larger injectors and tuning.

[vvv90]

Originally Posted by mjr5150

Shortcuts usually fall where they belong....directly on there face.... . Must have been a mean ride.....that vette.....

Oh I still got it...In fact, I just got the brakes bled, tranny fluid changed, and clutch hydraulics refreshed. It's all ready for the season....Just gotta get the body work done. She runs mean!

[Chase300]

"It appears to me that there are two major problems with supercharging these engines. The first is lack of tuning capabilty (particularly fuel management) over the entire rev range, and the second is powdered metal connecting rods. If you check with the Mustang crowd(I still have one) where SC or turbo is the preferred power adder, you will find that the non forged motors with cast pistons don't tolerate forced induction very well above about 6-8 psi(about 360 CSHP). On those motors running higher boost a bent/broken connecting rod was almost a certainty at some point. With forged internals reliability has been good up to 600+ HP with proper tuning. My personal feeling is that a motor capable of 500+ HP and 6500 rpm needs forged rods, crank, and pistons. But that's just me."

I believe the 6.1L Hemi's have forged parts...its the 5.7L's that are cast...or so I thought? Anyone confrim this?

[vvv90]

Originally Posted by Chase300

"It appears to me that there are two major problems with supercharging these engines. The first is lack of tuning capabilty (particularly fuel management) over the entire rev range, and the second is powdered metal connecting rods. If you check with the Mustang crowd(I still have one) where SC or turbo is the preferred power adder, you will find that the non forged motors with cast pistons don't tolerate forced induction very well above about 6-8 psi(about 360 CSHP). On those motors running higher boost a bent/broken connecting rod was almost a certainty at some point. With forged internals reliability has been good up to 600+ HP with proper tuning. My personal feeling is that a motor capable of 500+ HP and 6500 rpm needs forged rods, crank, and pistons. But that's just me."

I believe the 6.1L Hemi's have forged parts...its the 5.7L's that are cast...or so I thought? Anyone confrim this?

Generally yes, that's a good rule of thumb. Forged components can generally take more power than cast. However, cast components are not the problem themselves. It's purely in the tuning. a stock mill 6.1 should be able to handle the amound of power. The problem is that cast pistons are less tolerant of detonation and then the con rod or ring land goes. You can still blow a forged component with detonation.

I know someone who has hyper cast pistons running 750HP at 8000RPM's. There's nothing generally wrong with cast components as long as they're not run past their power rating or abused. In the case of 6-8psi hemi's, it's abuse.

[Sled]

Nice setup vvv90!

[Sled]

BTW,

I understand that the supercharger isn't so much the problem on the 6.1L mill but its the difficulty in tuning the engine with available tools. So the natural question is when will tools become available to allow the full range in tuning capabilities look those currently available for LSX series engines?

[vvv90]

Originally Posted by Sled

BTW,

I understand that the supercharger isn't so much the problem on the 6.1L mill but its the difficulty in tuning the engine with available tools. So the natural question is when will tools become available to allow the full range in tuning capabilities look those currently available for LSX series engines?

"tools" as in Edit software will be a while. B&G seems to have a monopoly on tuning the PCM. I have no doubt that if you brought them a blown hemi they could put it on the dyno and tune it properly......WILL THEY? That's probably not a possibility.

[Sled]

Originally Posted by vvv90

"tools" as in Edit software will be a while. B&G seems to have a monopoly on tuning the PCM. I have no doubt that if you brought them a blown hemi they could put it on the dyno and tune it properly......WILL THEY? That's probably not a possibility.

If given the opportunity, companies like EFILive and HPTuners could develop kick ass software, scanners, and programmers for the 6.1L. Little B&G flash upgrades just don't cut it for big time forced induction and nitrous applications.