Giro

Hey guys, I bought an 1990 rx 4 months ago (stored) so i'm still getting familiar with it. Now I noticed my auxiliary actuators are all seized so i'm thinking of just rigging all the ports to FULL AIR all the time. Has anyone done this? How does it run less torque at low rpm I imagine. Thanks boys.

RxFC3S-13B

It gets done all over the place. Its not uncommon for them to seize up. Unfortunatly when they seize up and don't move for many years, aux port rods and sleeves can also get seized up which would require you to remove the entire intake.

Keeping them open changes the intake velocity which from what I hear is why lower RPM power is affected.

arghx

iTrader: (3)

wait, what's seized exactly?

Pull the actuators off and see if you can rotate the rods by hand. If you can't, then you need to pull the manifold off to fix the problem. If they are in fact moving, physically check to see if the actuators move when you miss with them by hand. Finally, I think there's a solenoid on the s5 that switches the air (i've had trouble with my s4 ports before but have never messed with the aux ports on an s5). Make sure that's working too.

lupin

iTrader: (3)

you will have a better low end if you pull the manifold off and fix them. Also buy new gaskets and buy new vac lines.

Use the fsm in the faq for info on removing and installing the manifolds.

goodluck

Sideways7

iTrader: (7)

Just fix them right, it takes little extra time and less than 40 bucks, if anything.
Pull the actuators. If you can rotate the rod thingy, then the actuators are bad. Replace them, they are cheap. If they don't move, you need to pull the LIM to free them up, so there's no point in wiring them open.

Giro

Allrighty boys thanks for your input.

coldfire

iTrader: (1)

i actually find that leaving them open all the time is not so bad on the S5, since they have VDI. i have tried it with an S4 intake manifold also and it is noticeably worse.

it's best to get them working perfectly, but if you can't for whatever reason, just rig it up to be open all the time. having them not open properly will really hurt your top end.

arghx

iTrader: (3)

^ on my ported s4 motor the car is horrible to drive with them wired open. I had to downshift all the time going up hills and stuff because there was just no low end. That's how I had it set up for a while until I finally got my electronic setup working

lupin

iTrader: (3)

For the longest time they were stuck shut on my s4 and 1st gear sucked horrible and my airpump hose broke one night. I swear as soon as I hit 4k rpm it was like I wasn't in gear lol.

again goodluck cleaning them

Giro

I'm leaning twards fully open all the time. I mean it's a glorefied version of vTEC sort of. My last car civic SIR I tried running my VTEC so it would acctivate earlyer then 5000 rpm , wasn't so bad. It's funny i'v allready put more money in new parts then I bough the car for.

coldfire

iTrader: (1)

like VTEC? well, although it is RPM-based the principle is totally different.
VTEC tries to optimize the powerband by changing intake/exhaust timing. the 6pi and VDI system on our NA cars optimizes the power band through intake air velocity and pressure wave resonance/reflection.

raksj04

iTrader: (1)

is there anywhere you can buy them with out going thru a dealer??

scathcart

Auxilary ports (6PI) don't change intake timing?
I think you're a little confused. The auxilary ports add duration to the intake timing.

scathcart

Take the actuators off and move them in and out by hand. keep doing this until they move freely.
Take off the lower intake manifold, and then remove the actuators rods and sleeves. Clean them, polish them, put in the sleeves dry and the rods with a light coating of your favourtie synthetic grease, then reassebly with new gaskets. Coats the new gaskets with that syn. grease while you're at it... you'll never scrape another gasket again, and it makes them completely reusuable.

Don't rig them to full open. Only time to do that is when you're running nitrous.

Sideways7

iTrader: (7)

Yep, the aux ports change the timing. Its only the VDI that changes the intake runner length. In fact, the FC is the first production car with variable intake timing.

coldfire

iTrader: (1)

yup, sorry i didn't explain very well. the 6pi DOES affect intake duration. this is not a full timing change though since it is not changing when the intake port "opens".
with piston engines timing, lift, and duration are basically the factors that systems like VTEC try to optimize.
they've developed a more advanced system for the RX-8 Renesis, although i forget exactly how that differs to the S5 NA system.

i do know that it feels cool when i hit ~5500 rpm in my car .