ok i posted a while back about doing this.... when i port my manifolds i will have most of the motor apart and might as well do it then if neccessary. i had alot of opninons of people reply to my thread saying, they think its a good idea or a bad idea... i want people with experience not hearsay...

its a stockport motor with
CAI
TB mod
Ported intakes
Header
Test pipe
RP 50mm catback
Removed most engine bay crap
Rats nest removal
EGR blockoff plate
No ACV

and will soon have
SAFC controller or standalone
New injectors
ignition amplifier
8.5 mm wires
new plugs
and later on a 75-100 shot of n2o

so would i benefit removing the 5th and 6th ports entirely? thanks in advance

 

Highly modified NA? Good Idea.
Ive done it and have no regrets here!

 

What would the benefits be, instead of just removing them, of leaving them in place but open, with Pineapple racing inserts? Smoother flow - the stock arrangement is particularly bad for airflow, or so it seems.

-=Russ=-

 

I aggree with Dezerte.. But *Properly* working 6 ports do feel nice. I have a large SP s4, and it felt great for a while, but after a few months of messing with it, it felt slower.. So i tied the ports open to see what it would feel like.. the car felt and sounded different. So i said screw it, and i pulled the LIM off and ripped them out, and blocked off the actuators.. everything is removed.. and the car has never felt so good.. it pulls so much harder and pulls up to 8KRPMS, although it still needs to be tuned badly. I haven't noticed any loss of low end power.

If i had to do it again, i would.

Justin

 

I removed mine when i had my na, it felt nice for a while, but i definatly missed the low end power. I had no power till about 4k. If you dont mid reving high to make your power go for it but if you want to beable to punch it below 4k then leav ethem working.

 

I used to have a similar setup in my vert except my motor has a mild streetport and true duals on it. I took a noticable hit in torque down low, you might not lose as much because of the stock porting. It did pull a bit harder at higher rpms though, just make sure you get rid of the rods and everything in there.

When I swapped my engine into the GTU I went back to 5th and 6th ports w/ an S5 manifold, I miss my torque.

 

Earlier this year I removed the 6 PI sleeves while doing other maintenance on the intake manifolds. Up to that point the sleeves were stuck closed. I personally did not like the loss of low RPM torque, so I put the sleeves back in with the Pineapple Racing inserts (properly installed with green loctite). My car was weak up to about 3.5k RPMs without the sleeves.

I like the working version of the 6 PI system, because it makes the car easy to drive smoothly around town. If you want maximum peak horsepower though, you may want to eliminate them. I did notice slightly more pull in the higher RPMs without the sleeves; however, I will never remove the sleeves from my car. I prefer the broad, usable RPM range that the 6 PI system provides over the high RPM punch resulting from removing the sleeves.

 

Gain in middle and high end cannot be denied.

But the loss in low end makes me decide to keep mine in my modified N/A . . .

 

True.. Definatly lose lowend torque but your widening the bore of the auxilery ports by almost 2mm each as a result of removing the sleeves
Frank

 

There is no gain unless your ports are broken to begin with. Removing the ports will result only in loss. If you must do something, get the Pineapple sleeves.

 

I tend to disagree with you Aaron, sorry. The sleeves/rods/etc themselves can become a restriction as an N/A becomes more and more modified. At a high level of modifcation you might actually show top end gains by removing these minor restrictions. However, at a low level of modification you are correct.

As to the thread starter. I believe last time you asked this I pointed you in the direction of the archived thread on removing the sleeves completely along with everyone's arguments as to whether it is good or not and discussion on when, if it should, be done, etc etc etc. That thread is all the information you really need.

 

They will only be a restriction if the engine is ported. The stock ports simply cannot flow enough air to make the sleeve matter.

 

Oh yah just came to mind. With your exhaust setup are your aux ports even opening? Might wanna check that out as you have a testpipe now (no cat) which I'm guessing means no split air pipe and no backpressure to open the ports. Or are you running them off of the airpump? Or are they wired open? Removing them completely would be better than wiring them open if that's the route you've taken.

 

I agree with you there

 

if the car is a nuch lighter then stock do it, if it isnt u might want to think about it, as teh low end does get affected a good amount.

 

that is simply not true.

 

yes i remember that thread doub but i had very few replies and i dont remember if you said you had done it or not.... well i will be removing them then because i have the ports wired closed right now because it idles better and is nicer to drive in the morning... thanks for the replies, it was really all i wanted to know from the experienced people that have done this... thanks again

 

OK.....Proof?

Edit...My experience with this is that removal of the sleeves results in a car that is overall slower in the 1/4 mile. However, your mileage, as always, may vary.

 

I anticipated not using the 5th/6th port on my engine before the rebuild. I use a ramp of Devcon to smooth the transition into the chamber. Haven't made it to the dyno yet but the car is drivable at lower rpm. But, I didn't build it or port it to drive at lower rpm's. It will spin safely and reliably to 8500 rpm and thats why we choose the porting we did. Over 4K rpm the engine really comes to life. Lower and middle intake pieces are port matched. Very free flowing exhaust and a fuel computer to top it off.

 

i do not have the stocm manifolds on the car anymore, i woudl then show you teh dyno diffrence. the cross section of the 6 port sleeve and the port hole diffrence is exactly half. i dynoed 165 with the stock port motor and the pineapples sleeves in place when i took teh sleeves out as teh only mod, i did feel that there was more top end, i didnt feel that there was more top end because the low end wasnt as good, but you could tell the diffrence as i first approached this with just slowly gettign some speed and then downshifting and doing a WOT run. thi smight not be enouf to show you that there is a diffrnce, but i sure did feel it. i suppose i coudl install them and do a run on the dyno to see what teh diffrence would be on my custom manifold. mayeb ill do that next time. though i think most peopel woudl be interested to see the diffrence with them in and out on a stock manifold.

 

thanks again guys... after i do this im going to make a thread listing my mods and my results, however they wont be dyno results but i can maybe explain it better and honestly so that questions like this can be answered better