Semi AMG related..Supra twin-charged
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Senior Member
Joined: Jan 2011
Posts: 302
Likes: 1
From: Pittsburgh
'20 GLE350, '21 F150 Raptor, '03 BMW M3, '22 KTM 890 ADV, '23 Triumph Trident 660
I get the "because I can", but not very efficient. Plus, the S/C belt and pulley setup sucks. Needs more wrap at the pulleys, unless its not being driven very hard. To each their own.
Super Member
Joined: Sep 2010
Posts: 798
Likes: 4
From: HTX-->ATL -->CHI
2015 E63S 4Matic
From OP in SF thread:
The route is simple, this is a sort of compound setup. A SORT OF. The supercharger vacuum the air from the turbo. There is a line passing thru the charger and a parallel line bypassing it. The supercharger have a clutch also. On the way to the engine there is a one way valve. It works this way: up to xxpsi of boost the air will pass thru the charger. As soon as the turbo will build 1psi more than the charger boost the charger will be switched off and the valve will open. Then the charger will be bypassed and the air goes striaght from the turbo to the engine.
Pretty easy and very effective to make the turbo spool WAY sooner and to create huge torque at low rpms.
The charger will create about 19psi. While the turbo at low rpms create about 4psi. Remember that the boost created by a compound setup is -->NOT<-- the SUM of the 2 boost levels but the MULTIPLICATION of the PRESSURE RATIO levels. So just to make it in numbers 19+4psi will create 28psi as soon as the charger will be switched on. 28psi at 2k rpms could be too much stress for the rods so that's why we needed that wastegate!
Pretty easy and very effective to make the turbo spool WAY sooner and to create huge torque at low rpms.
The charger will create about 19psi. While the turbo at low rpms create about 4psi. Remember that the boost created by a compound setup is -->NOT<-- the SUM of the 2 boost levels but the MULTIPLICATION of the PRESSURE RATIO levels. So just to make it in numbers 19+4psi will create 28psi as soon as the charger will be switched on. 28psi at 2k rpms could be too much stress for the rods so that's why we needed that wastegate!
Super Member
Joined: Sep 2010
Posts: 798
Likes: 4
From: HTX-->ATL -->CHI
2015 E63S 4Matic
Someone asked him why use a supercharger re: parasitic losses:
you are completely right about the parasitic losses. But we are going to use the charger just to spool the turbo so I guess to around 4k rpms. After that the clutch will disengage it and there will be no loss.
We didn't opted for the nos cause 1) it's totally illegal here 2) With nos u have to fill the bottle every now and then 3) I prefer to have a "mechanical" setup rather than a nos setup (it's more intriguing!
)
We didn't opted for the nos cause 1) it's totally illegal here 2) With nos u have to fill the bottle every now and then 3) I prefer to have a "mechanical" setup rather than a nos setup (it's more intriguing!
)
