im porting my lim and im wondering if i should take out my port sleeves i know mazdaspeed7 did it im also know ill lose alittle bottom end but will it be worth it for the gain i see up high?please let me know and im sorry i dont have time to search just going on what i already know ....so should i do it?

87 gxl
tb mod
k&n intake
2 3/4 inch piping from cat to straight through muffler
ported uim

 

A little? Try like 20hp+.

 

so ill lose about 20hp down low!!!? so that a no huh

 

... you'll lose 20hp, and gain .5 hp up high. Your call.

I gauruntee if you remove them and go driving, you'll be tearing your intake manifolds back down so you can reinstall them and actually be able to move off the line faster than handicapped grandmothers cross the street.

 

ok thanks ill leave them in

 

good call

 

Taking out the aux sleeves or wiring them open or worse, hogging out the aux runners after removing the sleeves is the worst mod you could ever do to an NA FC!! Case in point: My friend and I have identical street ports done to our cars. His is S5, mine S4 with the lower compression rotors. W/o his aux sleeves, his car is an order of magnitude less burly below 6k rpm (his VDI valve is wired open too).

Don't disable or remove the aux port system! If you do, you will have a car that feels like a Honda, and you'll have no midrange, just top end power.

 

^ top end power that you would normaly have anyhow

 

See it doesn't really bother me...

I have a combined secondary/aux port streetport with no actuators or sleeves and combined ports on the manifold to engine part of the LIM. I also have an aluminum flywheel with this (even more difficult down low to some) and I must say it didn't even faze me. I daily drive this and don't care, top end power feels great, powerband feels very smooth through the whole rpm range.

Just giving the other side to this, the side that has it and drives it every day.

Also, before doing the port I ran with no sleeves either and I honestly can say I didn't notice a DAMN difference between having them working properly and being fully removed. And before anyone says something like "well obviously they werent working before" I did check them via the how-to on Aaron Cake's site with lithium grease and confirmed they were opening and closing properly.

 

I actually removed my sleeves. A couple reasons

My presilencer pipe was not activating them.. I don't know why, maybe a leak somewhere in the rubber piping that I used...
Also, im adding my turbo in this summer, so I don't give a **** if they're in or not, cause they won't be when the turbo is planted. Plus, I still don't even have my licence! lol, so im just finishing up my car and getting it drivable before I plan on registering it and such..

 

You need to drive my car Ddub when I finish the latest build. You know how big my ports are, bwahahaha. Get ready, we're talking nearly flat torque from 2.5k up to 7.

 

I'd love to drive your car man. Actually, what I'd love more is having the time to tear my engine back down and port more, going as huge as you did on the primary and extending the aux ports up higher. And then boring out the runners a bit more and moving the divider back farther... damnit now you got me all anxious to do it again.

 

I hardly ever make the runners bigger. They control a large part of the torque curve. Port timing is fair game though, and stock port volume is too small for the runners, so it doesn't hurt to make port volume a little bigger. too bad ur not down here now while the engine is apart, because my ports look a lot bigger in pics than in person. The way they ramp out makes them look huge, but they're not.

 

Interesting. One of these days I should make a trip down to Oregon to talk rotaries with you and Zach, he keeps trying to convince me to switch schools and come down there