xman

Hey guys,

I've got an 84 GSL-SE and I've finally got around to removing/replacing and repainting my exhaust: from Intake to Muffler! I Picked up some Racingbeat flanges and I'm gonna run with a: Header-Presilencer-Muffler set-up similar to the RB short primary one.

My problem is that I'd REALLY like to have my 5th and 6th ports functional.

My cats were replaced by the previous owner and the actuators were seized! After removing the upper and lower intake manifolds I managed to free the actuators and clean all the carbon from the 5th and 6th exhaust ports! I've decided to try to fabricate the header with a similar a set-up to the Mazdatrix Header below.

What I'd like to know is whether or not I can remove the ACV with no ill-effects? I'm assuming that this won't be a problem as it wasn't connected to the air pump before, although I do remember reading somewhere that the ACV "boosts" the signal to the aux ports? Does anyone know if this is true?

If it's not, I'm assuming that I could just fab a block-off plate and plug the 2 vacuum lines on the lower intake manifold as I don't think my ACV valve is working? Any help would be GREATLY appreciated!!!

Oh, and as far as the connector on the ACV, is it okay to just have it unplugged (I can't even remember where it plugs into). Thanks in advance, (and sorry for the epic post)!










I had removed the airpump and blocked the hose to the ACV valve.

John64

No prblem, If you want the 5th and 6th ports to work you will need to have a retirn from your presilencer to activate them.

Jeff20B

iTrader: (13)

No. Take it from the header. It's closer and works better. Mazdatrix even sells a header with a fitting on it specifically for a GSL-SE's aux ports.

xman

Yeah, I believe the input from the header is better at activating the aux ports than an input from the presilencer, but it's too pricey to ship one to CANADA and I should be able to fabricate something for much cheaper (famous last words).

As far as the ACV goes, could I just remove it and use a blocking plate or is that going to cause any problems? There's isn't really anything regarding the ACV on a GSL-SE and the emmissions removal tutorial doesn't really say too much about the GSL-SE (perhaps removing this stuff's not recommended?)

xman

What I meant to say in that last thread is that when searching the posts, I couldn't find a lot of info on the removal of the ACV for a GSL-SE..........

trochoid

iTrader: (6)

I tap a 1/8" brass compression fitting just after the curve on the header, then run an 8-12" piece of 1/8" copper tube to the rubber hose that goes to the aux ports. Works well on both the SE and S4s.

If you need a pic, I can look for one, I deleted a lot of pics on my comp and may not have it any more. I have posted it before though.

jarath

I don't mean to derail the thread but for my own information, isn't the ACV attached to the BAC valve?

John64

Nope

xman

Thanks trochoid, and if u could find any picks I would be 4-ever in ur debt. I wuz thinking of using stainless steel brake line insead of the copper tubing though(figure it's easier to find?), or do u think copper's the way to go? I wuz thinking of following the info from part of a thread that I cut and paste onto my desktop a while ago:

"The pickup is about 5/8ths of an inch in diameter, and then funnels down to the size of the pickup tube hose (I think 5mm) using a bung attached to a piece of brakeline. This seems to be the best method for actuating the 6ports, as it works pretty much no matter what."

Not sure which post it came from, but whomever's info it is....thx, and props to u! (whomever....is that a word?).

jarath, ACV stands for Air Control Valve. It's located on the lower intake manifold between the two actuators that activate the auxillary ports. It has wires and a connector coming from the Split air solenoid valve that's located on it. The ACV functions to direct air to various areas of the exhaust for emmissions, etc. I think.

The Air Supply Valve is what's attatched to the By-pass Air Control Valve (or BAC). I believe the Air supply valve functions to by-pass air to the Dynamic chamber when increased load is placed on the engine from the air conditioning, etc.

xman

trochoid. just saw pics of ur ride on another thread. Looks F-A-S-T. What kind/colour of paint is that on ur intake manifold and alternator/thermostat housing? Like the look.

trochoid

iTrader: (6)

Pic is in this thread. https://www.rx7club.com/2nd-generation-specific-1986-1992-17/6-port-gorus-help-404297/

Engine parts are powdercoated. Intake manifold is a silver, other parts are a candy teal.

John64

The bung at the presilencer works fine, full operation.

xman

Thought that looked like powdercoat. Nice!

John64, heard that the presilencer method requires proper tube size and placement or the pressure's not high enough?

Rx-7Doctor

iTrader: (13)

The header/pre-silencer from Mazdatrix is the Rb setup. The pre-silencer has the attachment for the stock air tube. The actuators use the same source as if the system was stock.

Xman. When you purchase a RB header it comes with a blockoff plate for the ACV and you also remove the air pump. The 6 ports will continue to operate as normal as long as there is a pressure port for them. IE: The stock air tube that went to your cats as long as you were using the appropriate pre-silencer for the SE.

John64

Yep^^^

Jeff20B

iTrader: (13)

rx7doctor, this page shows what I'm talking about. http://www.mazdatrix.com/r-exh-85.htm The header Mazdatrix modifies is part of this complete system. 16-MZTX-4230

thekyl

Yea im curious as well I have removed my aux ports and my ACV just not sure what else I need to do to make it function properly. Any help is much appreciated.

xman

rx7doctor, I'm using a presilencer from my 82 (God rest her soul), that doesn't have the backpressure tubing attatched. As a result, I wuz going to fab a header like the Mazdatrix one Jeff20B is talking about. I'll add a bung for the stock 02 sensor and that way I won't have to mess with the proper placement for the tubing on a presilencer.
I think I have an ACV block-off plate as wel, so I'll block that off and then cap the tube on the lower intake manifold where the split air pipe (from the cats) would have attatched to. Hopefully everything will function a-okay? I don't think I'm missing anything.........