Re: Hellcat help, someone smart explain
[Re: AeroMonte]
#2547773
09/09/18 12:36 AM
09/09/18 12:36 AM
|
Joined: Nov 2006
Posts: 2,255 IL
furious70
top fuel
|
top fuel
Joined: Nov 2006
Posts: 2,255
IL
|
I'd be interested to learn why the oem setup is that way. But wouldn't you be ok with a conventional bov that vents to atmosphere?
70 Sport Fury 68 Charger 69 Coronet 72 RR
|
|
|
Re: Hellcat help, someone smart explain
[Re: AeroMonte]
#2547841
09/09/18 10:50 AM
09/09/18 10:50 AM
|
Joined: Jan 2008
Posts: 4,255 Canada
WO23Coronet
master
|
master
Joined: Jan 2008
Posts: 4,255
Canada
|
Isn’t it a bypass that opens and bypasses the rotor pack under light throttle so the supercharger isn’t trying to compress air when it’s not needed? It keeps the supercharger from heating up and working so hard (trying to suck through a partially open throttle body). It also helps gas mileage when it’s open because the blower is now just freewheeling and not compressing anything. How do you have the blow off valve hooked up? Can you set it up to open under vacuum? MMX has a vacuum operated bypass for the HC
Last edited by WO23Coronet; 09/09/18 10:53 AM.
|
|
|
Re: Hellcat help, someone smart explain
[Re: AeroMonte]
#2547867
09/09/18 11:43 AM
09/09/18 11:43 AM
|
Joined: Nov 2006
Posts: 2,255 IL
furious70
top fuel
|
top fuel
Joined: Nov 2006
Posts: 2,255
IL
|
something in front of the throttle blade can't create a vacuum leak. But you'd have to cork the other part I suppose and use a conventional bov. The OEM system sounds like a nifty efficiency trick, great if the aftermarket ecu can control it.
70 Sport Fury 68 Charger 69 Coronet 72 RR
|
|
|
Re: Hellcat help, someone smart explain
[Re: furious70]
#2547890
09/09/18 12:25 PM
09/09/18 12:25 PM
|
Joined: Nov 2003
Posts: 6,427 S.E. Missouri
AeroMonte
OP
master
|
OP
master
Joined: Nov 2003
Posts: 6,427
S.E. Missouri
|
something in front of the throttle blade can't create a vacuum leak. But you'd have to cork the other part I suppose and use a conventional bov. The OEM system sounds like a nifty efficiency trick, great if the aftermarket ecu can control it. I have it behind the throttle body. I was told it would damage the throttle body if it was in front of it at wide open then suddenly let off the throttle. I can't find a reference to an MMX bypass either.
|
|
|
Re: Hellcat help, someone smart explain
[Re: AeroMonte]
#2547935
09/09/18 02:12 PM
09/09/18 02:12 PM
|
Joined: Jan 2008
Posts: 4,255 Canada
WO23Coronet
master
|
master
Joined: Jan 2008
Posts: 4,255
Canada
|
I don’t think it’ll affect it at all, just gives it abit more volume before the blower. The MMX bypass is a brand new thing and probably isn’t on their website but is on Facebook (that’s where I saw it). They showed it as part of their Hellcat blower swap to a 6.4 kit
Last edited by WO23Coronet; 09/09/18 02:14 PM.
|
|
|
Re: Hellcat help, someone smart explain
[Re: AeroMonte]
#2548077
09/09/18 08:37 PM
09/09/18 08:37 PM
|
Joined: Feb 2005
Posts: 5,207 Menomonee Falls
DemonDust
master
|
master
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
|
If I'm seeing this correct, this thing will never make boost since you removed the bypass throttle body. The boost air will be returned to air inlet. Your BOV will do nothing since it already has no boost.
Last edited by R5P7Duster; 09/09/18 08:37 PM.
|
|
|
Re: Hellcat help, someone smart explain
[Re: WO23Coronet]
#2548082
09/09/18 08:39 PM
09/09/18 08:39 PM
|
Joined: Feb 2005
Posts: 5,207 Menomonee Falls
DemonDust
master
|
master
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
|
I don’t think it’ll affect it at all, just gives it abit more volume before the blower. The MMX bypass is a brand new thing and probably isn’t on their website but is on Facebook (that’s where I saw it). They showed it as part of their Hellcat blower swap to a 6.4 kit Not brand new, Whipple uses them.
|
|
|
Re: Hellcat help, someone smart explain
[Re: DemonDust]
#2548104
09/09/18 09:14 PM
09/09/18 09:14 PM
|
Joined: Nov 2003
Posts: 6,427 S.E. Missouri
AeroMonte
OP
master
|
OP
master
Joined: Nov 2003
Posts: 6,427
S.E. Missouri
|
If I'm seeing this correct, this thing will never make boost since you removed the bypass throttle body. The boost air will be returned to air inlet. Your BOV will do nothing since it already has no boost. The bypass has been hollowed out and capped off inside. Basically just using the modified body. Air goes into the supercharger, squeezed up into the plenum and down into the heads. I blocked the bypass at the bottom before the supercharger and added the tube for the BOV on the topside from the plenum. It is vacuum controlled and plumbed back behind the throttle body into the supercharger inlet. Under part throttle it should bleed off the pressure but under hard throttle it should close to build pressure. At least in my mind that's how I have it figured but just want to be sure. That's the best way I can describe it in my non technical way. That's why I'm here asking, because I know there are some really sharp people here that can tell me yes or no. I do appreciate all the input. I'm learning .
|
|
|
Re: Hellcat help, someone smart explain
[Re: DemonDust]
#2548135
09/09/18 10:22 PM
09/09/18 10:22 PM
|
Joined: Jan 2008
Posts: 4,255 Canada
WO23Coronet
master
|
master
Joined: Jan 2008
Posts: 4,255
Canada
|
I don’t think it’ll affect it at all, just gives it abit more volume before the blower. The MMX bypass is a brand new thing and probably isn’t on their website but is on Facebook (that’s where I saw it). They showed it as part of their Hellcat blower swap to a 6.4 kit Not brand new, Whipple uses them. I mean it’s a new kit for MMX specifically for the Hellcat, I realize they’ve been used forever (Eaton used them way back in the 90’s and maybe even before that)
|
|
|
Re: Hellcat help, someone smart explain
[Re: Dragula]
#2550423
09/15/18 08:42 PM
09/15/18 08:42 PM
|
Joined: Jan 2003
Posts: 1,938 Sonora CA
Mopar_Rich
top fuel
|
top fuel
Joined: Jan 2003
Posts: 1,938
Sonora CA
|
Should work....Rich at Fastmanefi did somthing similar. Yes the Dominator will drive both the DBW throttle body and the bypass valve, but that is NOT what you want to do. The OEM ECU keeps the bypass closed most of the time. They open the bypass to control the rate of boost and serve as a blowoff valve on throttle release. The Dominator would drive the bypass valve proportionately (in a linear fashion) which you do not want to do. I have done two Hellcat swaps and I replaced the bypass valve with a generic vacuum operated blowoff valve. That works GREAT and since the blowoff bleeds back into the same port that the bypass valve did, it's very quiet with no blowoff hiss. The Holley tune needs to take into consideration that the boost will come on quick and timing must compensate for any condition where the engine might be lugged at a lower RPM, but that's normal stuff. Both cars are a blast to drive. BTW: I have done this with both stock and Magnuson blowers and I tuned both knock sensors as a precaution because increasing the boost is very easy to do. Last one was 850 HP at the rears. If you want more info just contact me.
|
|
|
Re: Hellcat help, someone smart explain
[Re: Mopar_Rich]
#2550597
09/16/18 12:53 PM
09/16/18 12:53 PM
|
Joined: Nov 2003
Posts: 6,427 S.E. Missouri
AeroMonte
OP
master
|
OP
master
Joined: Nov 2003
Posts: 6,427
S.E. Missouri
|
Should work....Rich at Fastmanefi did somthing similar. Yes the Dominator will drive both the DBW throttle body and the bypass valve, but that is NOT what you want to do. The OEM ECU keeps the bypass closed most of the time. They open the bypass to control the rate of boost and serve as a blowoff valve on throttle release. The Dominator would drive the bypass valve proportionately (in a linear fashion) which you do not want to do. I have done two Hellcat swaps and I replaced the bypass valve with a generic vacuum operated blowoff valve. That works GREAT and since the blowoff bleeds back into the same port that the bypass valve did, it's very quiet with no blowoff hiss. The Holley tune needs to take into consideration that the boost will come on quick and timing must compensate for any condition where the engine might be lugged at a lower RPM, but that's normal stuff. Both cars are a blast to drive. BTW: I have done this with both stock and Magnuson blowers and I tuned both knock sensors as a precaution because increasing the boost is very easy to do. Last one was 850 HP at the rears. If you want more info just contact me. Thanks Rich. The smart guy helping me with this build is Bervil Hillis. He has been in contact with you and will probably be again when he sets up the tune. We have a basic tune installed and the car runs but we have not driven it yet. Just happy to hear it run for now. I'll post pisc in a bit of the BOV setup we made. I would like your input if you don't mind.
|
|
|
|
|