As if now, im running stock exhaust manifold ti straight pipe to stock mufflers. The stock split air pipe was welded to the straight pipe. Needless to say, the six port induction was not working. With a boost gauge, i was measuring 1psi full throttle, in all gears. Good for flow, bad for the six ports.

When i traded for this car, the exhaust was already done. Air pump removed, and block off plates installed. I have since reinstalled the BAC and have sold idle even with a/c on.


Anyways, ill just get to the point. I drilled and tapped the ACV block off plate right where the exhaust flows. Retested; 2psi by 3000rpms, 5-6 from about 4000rmp to redline in second and third gears.

Hooked everything up, with a few dabs of grease on the actuator rods and took it for a spin.

FINALLY! This car had hreat low end for an N/A but now it pulls to about 7100rpms before it dies off.

So if you already have the ACV blocked off, all you need is 1/8npt tap, 1/8th npt nipple and less that a foot of vacuum line for functioning 6PI.

 

Dude. This is awesome.

 

Nice. I always thought that would work but I have never needed to try since I race in scca solo STR class and have the emissions system intact with high flow cat. I knew that spot would be referencing exhaust pressure at the sleeves, and now we know the pressure is enough to actuate the auxiliaries.
Thank you for the info. Can it also actuate the VDI?

 

Are you using s5 upper and s4 lower? Unless I am not remembering the differences correctly.

Nevermind I just looked at my s5 intake.

 

hopefully it doesn't cook the actuator diaphragms or fill them with carbon deposits..

sorry for the negativity but i think this is a short term solution. best case is you will just have to clean out the steel rail splitter periodically.

 

I think if that was the case then the racing beat 6 port header would burn them up as well. My diaphrams have survived 4k miles of nonstop racing so i think theyll be fine.

 

perhaps, i think it really depends on how long you will expect them to last. there's already a lot of carbon floating around in that passage and the benefit of the silencer using backpressure is that carbon doesn't accumulate that far down the exhaust compared to inside the irons via the port openings.

the heat would also be less from the mid section of the car versus taken directly from the ports.

 

That is excellent. I'll likely run into a similar challenge, so thanks for posting.

 

I think the diaphragms should be alright. I mean the actuators are already in a pretty hostile environment.

But carbon build up is a legitimate concern. Right out the exhaust port is a very carbon rich location. I'll check it in six months to see if its all good in the hood.

 

It has only been a few weeks but it's all hood so far.