ok, I have a 90 GTU, with a Bonez race pipe on it, under partial throttle, I can feel the 5th and 6th ports kick in at 5500 rpm, but for some reason, under full throttle, I don't feel that same kick, and it almost seems like it isn't accellerating as fast, could that be from running too rich? I always thought the ports should open regardless of the mixture though. Any suggestions on how to tune the car to run better under full throttle? S-Afc maybe?

5500 rpm is awful high man.....they should open up at 3400-3800 rpm....you aren't creating enough back pressure to open them up with the air pump....just wire them open

umm, from everything I have heard, the aux ports are supposed to open at 5500 rpm, the secondary injectors activate at 3800 rpm, maybe that is what you are thinking of? and wiring them open just makes me lose low end power, which there is far to little of to begin with.

edit: and since I have a series five, my 6th ports are not opened by backpressure. they operate of the vdi, which works, at least at 1/2 to 3/4 throttle, it just doesn't kick like it should when I am at full throttle, maybe I just can't feel it, but it is almost like I lose some power by pushing the pedal all the way down

they will open regardless of the mixture. To see if they are functioning fully use an air compressor and blow air into the vacuum hose. To see if they work under load put a some grease on them and go for a drive then come back and see if its smeared. I forget exactly when they open but i thought it was somewhere near 4000rpms.

well i know they work, at least at partial throttle, I will be accellerating, then, at exactly 5500 rpm, my car kicks a bit, and I am suddenly accellerating faster, but, i don't feel that added acceleration at full throttle.

maybe u don't have enough backpressure until 5500rpms. Thats too high its supposed to be way lower. Somethings wrong, go fiddle with it.

hmm, even when I had the stock exhuast, it did the same thing, except it worked at full throttle, and I am not going to mess with it now, it is dark, and raining, and I have no garage. when is your car gonna be running?

soon as i get some more C@sh, need k2rd rail, and some adapter for stock primary rail, then im pretty much set, still need to wire it though, so soon.

on a 90 there are 2 different things. the 5th and 6th ports and the vdi. the 5th and 6th ports are the rotary valves in the intake and they open at 3600-4000rpm and they are actuated with the air pump and a solenoid. the vdi is also activated by the air pump and a solenoid, it turns on at 5500rpm. the vdi you can blow into it opens at about 1psi.



mike

So his ports should be opening between 3600-4000 and not at 5500 like they are now then?

that, or I am feeling the vdi kick in at 5500 rpm. not sure what it should feel like, maybe I will go screw with them tomorrow, since I don't have class.

and where is this stuff located? I have never messed with it before.

what year is your car? only s5 have vdi. These things are located on the intake plenum. Do u have a haynes manual? if not you should get one, they are like $10 and very worth it.

I have a question relating to this: when changing my oil, I was trying to find where the six-port actuator was located, just so I know. I thought I found it, and had my wife rev the engine real high to see if something moved. it did, so I want verification: is it on the passenger side of the engine, closer to the firewall, with the cylinder pointing to the right side of the vehicle, with an arm that pushes out to spin the cylinder?

yes baldy you have discovered the 6 ports, lol j/p that would be them above the exhaust manifold

the vdi is on the upper left of the motor, its a round thing with a vacuum line going into it



mike

ok, having located the 6 ports, I took the actuators off, and tried to move them by hand, using a screwdriver as a lever, I was barely able to move them at all, though, I am not sure which direction they are supposed to be going, I assume clockwise, since that is the direction I was able to nudge them, now, how do I clean them so they will move? and what should they look like when fully open?

there are stoppers so they can only rotate one direction. if you take the actuators off you should be able to move them with your fingers. if not they are dirty, the only way to clean them is to take the manifolds off and clean it all out with solvent. if you are lucky you will move them and it ill free up enough that a few high rpm runs will clean them out



mike

No luck, they were so locked that I actually sheared one of the levers off, so I didn't mess with the other one, the actual actuator (thing with vaccuum hose on it) is moving now, after a WD40 bath, but it looks like I have j00red my 6 ports from working for quite a while. if ever.

now you are going to have to open the whole intake manifold and clean it from the inside, that should be done from a tech though, you will also have to buy the the 2 intak gaskets when doing this also. And i dont think this is too cheap also but you will feel a difference when finished

aaaaahh!! to many "also's" I can't comprehend what you said!!!