I was wondering what you can and can't do to the exhaust system on an 86-88 n/a if you want the 5th and 6th ports to still work. Can you do any reliable mods to keep them still working? I would like to know what others have done as well and what kind of power loses is the ports don't open? https://www.nopistons.com/forums/pub...#>/biggrin.png

I hear you can use the Racing Beat Header/Precilencer setup and the ports will still open. If you want to do something like straight pipes, then you can always wire the ports open. It's pretty easy. You'll notice a very slight drop in low end torque, but all the HP will still be there. You can add any cat-back and the ports will still open. Hope that helps a little.

I thought that applies for s4? isn't he asking about s5?

thanks for the advise. And Baldy it is an S4. The S5 were from 89-91

https://www.nopistons.com/forums/pub...#>/biggrin.png

yeah, as long as you have the backpressure tube hooked up from your main cat or presilencer with at least 2-3 psi, your 5/6 ports should open.



I am against wiring the ports open if you can avoid it since all you are doing is losing low end and gaining nothing at all..... plus one of my S4's right now has no backpressure/split air pipe hooked up and when I wired them open temporarily, the torque loss was just too much for me... not worth it.

Ok what are they. Are they on the exhaust or on the intake? can someone tell me how to tell if they are working or not.

they are for the intake, the run off acuaters(did i spell that right?)the open and close for more air and fuel to get in to the cumbustion chamber

they are located above the exhuast manifold. you can try greasing them and then driving the car and see if the grease moved.

They should open around 5000rpms. if they dont work you would probably notice it becuade the car wouldnt pull as well as it did in the lower rpms. Im sure someone else can give you a better discription if needed.

Yep, what everybody else said. You can't see the sleeves because they are in the lower intake manifold. But you can see the vacuum actuaters that turn the sleeves. Here is a pic of the actuators. I painted mine blue to let a little bit of the ricer in me out https://www.nopistons.com/forums/pub...R#>/unsure.png

Here is another pic that might help. This is with the LIM (lower intake manifold) removed. You can see the end of the sleeve sticking out of the secondary hole on the engine side.

Alright one more. Here is a pic of what the 5th and 6th port sleeves look like. I put some pineapple inserts in mine and that made a nice difference. You can also check the ports by spraying some condensed air into the 5th and 6th port hose. You dont need very much psi to do it, I think even one of those cans of compressed air would work.

Nice. What did you use to secure the inserts, loctite?

I used red loctite for mine...did you notice any sound difference? when mine kick in, I here a higher pitched rev sound on top of the normal engine sound...I like it https://www.nopistons.com/forums/pub...IR#>/bigok.gif

Thanks, I didn't get there yet... I'm pretty much following suit on what you did and removing more emissions stuff. I have the UIM runners ported a bit with a die grinder, the TB done and I didnt get to the LIM yet. Can't wait to drive the car again...

yeah, I didn't feel comfortable removing the emissions stuff, just cleaned everything up and replaced hoses



how did you port the intake runners? I couldn't even get anything but a pipe cleaner up there, around those curves

Same here, red loctite. I think that is what Pineapple recommends. I don't know if the sound changed on mine. I really can't hear anything over my exhaust, lol. Before I put the sleeves back in I coated the outside with some marvel mystery oil since there was already some gunky buildup on the sleeve holes. I figured it would help them turn better.

i just took mine out.

no sleeves.

everybody said i would lose low end power but i didnt notice at all.

https://www.nopistons.com/forums/pub...IR#>/smile.png

The ports should open with about 3 psi, at around 3500 - 4000 rpm.





LOL!!

Actually my friend took it to his job and did it on some die grinder (I've never seen this thing). I saw what he did on his turbo and manifolds and I couldnt believe how smooth it got them so I figured what the hell. It was a minor port job, more polished smooth than anything, not too much metal removed. He was only able to go down to the bends on the runners where it meets the dynamic chamber and the LIM but I figure if he matches the LIM and with what I did to the TB, it should help. I polished and removed some metal from the inside of the TB too with a rotary tool. I think Pengaru has a pic of his where he did similar.

i really wouldnt spend time porting the TB if arent displacing a large amount of air vs the stock motor. Pengaru has a nice porting setup in his motor and that is why he did it. Uprated turbo motors will benefit from it much more than a NA motor..



just my shithead advice..

I hear ya.. I really didnt port it, I just polished the bores down smooth. I have a bunch of spare intake parts so why not. I figure with the TB mod, all the polishing, and the pineapple inserts, it has to help power even on a non ported NA. I'll have to take side by side pics so I can show you what I did so far.

What if i just take the sleeves out of the engine. Any power gains?? /any power loss???





how well do those pinapple racing inserts work. they seem pretty cheap, i would like to purchase them



When the Pinapple inserts are in, are they still functional? do they still turn?



whats makes them better than stock sleeves? Man i'm confused.

If sleeves are taken out I heard there is a power loss



Pineapple sleeves work great, and they work just the same as the stock units.



They are better than the stock units because they have a little incline made into them, smoothing out the flow of air...

I saw mention of my ported TB, just wanted to mention I'm not even going to use it on my car since I've got the TWM throttle body setup now...



maybe I'll sell it, it has the double throttle removed and the thermowax gone, holes welded and it's ported, also has a brand new TPS on it. PM me if interested.

how hard is it to just block off the 5th and 6th and just loose low end but gain alot more top end.?

Remove the sleeves and go for a drive. Not hard at all. You don't want to block off the port sleeves since they already block the port as it is then reopen when they are actuated. You want them open all the time (as you mentioned).



Pull off the LIM, stick your finger in the top port, wrap your finger around the arm in the sleeve, pull them out, bolt it back up, go for a drive.