Here is a 3.6 Throttle Body. Notice how it has the one large port in the middle
To the left and to the right of that there are no ports at all.
Now on the B38 3.8 Throttle Body they have a vacumn bar accumulator that runs the length of the throttle bodies, with each set of two having a little box that connects to it.
Then when you compare the other side of the throttle bodies, the 3.6 has the one port and two smaller ones above it:
The 3.8 throttle bodies do not have this on this side.
Now I have to admit, I haven't really researched this yet, nor have I even attempted to install and figure it out...which Im sure I could. Just looking to see if anyone else has done it already and can provide some input. I'm assuming the easiest way to do this, is just use all of the 3.8 hoses etc etc etc.
Im aware of the porting necessary, and I know they bolt up. What I was trying to figure out was the best way to adapt / modify the 3.6 setup to the 3.8 setup / or just use all the 3.8 vacuum hoses, ICV etc etc... Does it make sense what Im asking...because Im starting to confuse myself
You should connect the fuel pressure regulator to the vacuum bar and the vacuum reservoir line with the check valve to the port on the number three throttle body. The IAC valve plugs into the rail as well instead of onto the cast throttle port on the 3.6. But after the vacuum reservoir you still have to use the plastic T to feed the solenoid for the air injection pump and for the resonance flap. On the 3.8 this isnt needed because it uses the ECU to control the variable resonance flap assembly.
I honestly couldnt tell you man, ive been dreaming of throwing some 50mm on my 3.6 to but i just cant convince myself to spend so much money for an extra 2mm per throttle. Ive got a 3.6 head that im gunna be developing some throttle slides on this year, custom port shaped to match the intake port and not stay round but oval to keep air velocity up .
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Engine : S38B36 - MM 296° Rally Intake Cam, E28 Exhaust Cam (248°), Race Port (31mm) , High Lift Valve Springs, High Performance Rings, Refreshed Bottom End, Port Matched Throttle Bodies, BMC CDA Intake
You should connect the fuel pressure regulator to the vacuum bar and the vacuum reservoir line with the check valve to the port on the number three throttle body. The IAC valve plugs into the rail as well instead of onto the cast throttle port on the 3.6. But after the vacuum reservoir you still have to use the plastic T to feed the solenoid for the air injection pump and for the resonance flap. On the 3.8 this isnt needed because it uses the ECU to control the variable resonance flap assembly.
Awesome, that's exactly what I was looking for.
Last edited by jibbajabba; 2nd July 2009 at 23:01.
Reason: because I can't spell for ****.
After re-reading my post I got a little confused when I was explaining the actuation of the resonance flap for the S38B38 it is also actuated by a vacuum solenoid its just that its switchover points are controlled by the ECU and not a separate control unit like the 3.6. None of that changes what I told you I just didn't want someone to get misinformation.
Linear Mode
