Oh, right the race sleeves. Pineapple racing makes replacment 6 Port Induction sleeves for the 5/6th ports. You remove your actuators, and pull out your old sleeves, put in the pineaple racing sleeves, and reinstall the stuff. You can leave them inactive and in the open position or put it all together and have them open as they normally would. The difference is that the Pineapple sleeves are modified versions of the Original sleeves w/ aluminum inserts and have curved ends inside the port which help direct the airflow thru the sleeve as opposed to mazda's dead-end inside the sleeve which creates turbulence and decreases smooth airflow.

chris
click here to see the
Pineapple racing 6PI sleeve

 

Thank you for the link......how much of an improvment is known with the Pineapple Sleeves....and is anyone using them? I can understand why they may be better and they seem like they are one of the cheaper mods you can do.

 

You make some very good points flubyux2. Some of them are hard for me to convince others about. This mod is not for everyone. Anyone worried about losing stock drivability will probably not like it. Drag racers probably will. Not everyone would have to do every little mod that I have to still get a benefit. We have 3 piece manifolds so any combination can be used. At the very least I recommend doing something about the stock location of the secondary injectors. Get them out of there. It would be very easy for me to go back in and relocate them to the original spot on the manifold without having them protrude in any way into the airstream. This would probably appeal to more people. A lower manifold can be modified yet still retain the actuation system. The actuators are the biggest restrction however. The factory dynamic chamber is the highest flowing stock manifold piece. Yes I will admit that! But that doesn't mean that I can't still make it affect the powerband. When I modify them I am changing the tuning effect of the plenum and shifting it up a little. The goal is to equalize the speed of air through all 3 throttle plates. The primary plate feeds 2 ports all by itself while the secondaries (depending on which manifold you have) feed their own port respectively. Air moves much faster through the primary plate than the secondaries which in turn makes it a little restrictive when airfow demands are high. Ted did point out that this is for low end drivability. I agree but it doesn't bother me and doesn't really hurt that much anyways. When the plenum becomes one chamber airflow is equalized speed wise through all 3 plates. The air does have to move a little faster through the secondary plates but the air slowed down through the primary making it less of a restriction. Sounds a little messed up and may not seem to make sense at first. Its just one of those things you have to stare at until it makes sense. This isn't a really accurate comparison but it does work in a similar fashion: On my friends Stroker 383 he had a dual plane manifold originally. It was good for low end and idled good. When he changed to a single plane the car completely came alive. The car revved faster had more power and the draw through the same carb was night and day different. Low end suffered a little but it didn't matter. He also has gobs of torque anyways! Ultimately rejetting the carb will yield the best performance but the gain was nice without. I know its not an accurate comparison since the dynamics were different between the two engines but I noticed a similar effect when I did mine just not to the same extreme.

I know that the g-tech isn't the best device in the world but it does show me if something I did had a positive effect from the drag racing point of view. Things might be different though on an autocross course for most people. My engine is also a GSL-SE which has smaller intake runners on the primarie ports and a very small afm. My afm is about 25% smaller than the 2nd gen at about 4 square inches. My opinions about wheel dynos are based on shady results and inconsistencies that I personally experienced a few years ago when I took my car to get done. It probably was operator error though but it still left a bad taste in my mouth when it comes to those devices. I would prefer to use an engine dyno since they are most accurate. I would like to know how much power the engine actually makes. There is NO accurate formula for determining drivetrain loss. The same tranny on one car my have more loss than an identical one on the next car. I haven't really had the time to do all the work I need to do lately between school, work, g/f, and other things. Not to mention the fact that I am working on both of my RX-7s at once, a friends house and a few things for other cars. I need a 36 hour day! When I get done with everything on my GSL-SE I will get it dynoed. My second gen is a turbo monster so it would not be a good baseline to judge anything off of. If I would have saved the original modified manifold I did a few years ago I could just swap out one for the other and go but I didn't. Oh well. Just needs a little more patience.

Oh yeah..."Office Space" that movie rocks!

 

post your MAF mod please

 

in reply to mazdaspeed and the porting of the MAF,

what is the point in porting the area in front of and behind the MAF, you still have that damn flapper door in the way, unless it is S5. regardless i dont think there is any porting on the MAF that could possibly increae airflow without messing up the sensors.

Justin

 

RX7Impreza, it would make a difference by porting the in/outs of an AFM.

If you beveled the inside edges of the AFM inlet/outlets, it would allow the airflow in and out of the AFM to be more laminar and create less turbulence. As it stands, the air close to the walls of the intake tube run into a 1/4" ridge and must figure out a way to merge w/ the rest of the incoming air. Its like if you were trying to merge with traffic on a freeway from a stop on a cross-street. Now if you beveled the edges, it would be more like trying to merge with traffic on the freeway using a standard on-ramp. The same principle applies for any kind of air/fluid flow, of course in the simplest of terms...

This is quite a miniscule gain, and some people may not even think its worth their time...but its kind of like shaving weight, it all adds up in the long run. Especially since we are dealing with less than 200 WHP, every little thing can help. Ill take any tip or trick i can get my hands on to gain that little extra HP...as long as the price is right =o)

Chris

 

I was wonderign how ya did it without messing up the sensor, thanks for explaining flubyux, i just dont like how small my MAF looks

 

i fully understand the concepts of airflow, i just think there are more valuable things to be done. example, i dont think porting the intake runners is useful at all unless you can cut them in half take out at least an 1/8 all around and weld them back together then extrude hone them, by the time you do that you would have spent enough time and money to do a good port and rebuild for FAR less noticeable gains.

port matching is another story, and i can see grinding down those types of things in the throttle body and after, but i fail to see the point in porting the AFM. it is like me going out and porting the stock filter box

my $.02

Justin

 

First off I like the effort you are putting into your mod. I haven't read all the posts. My lunch is not that long. (maybe tommorow)

My question is about the series 4 lower with the series 5 upper. More detail on this please. Did it bolt right up??

Second as an engineer you have to get past this:

Management is not likely to treat your designs or ideas with even one shred of delicately. At one company I worked for we called the design reviews "beat me - kick me" as that's how we all felt afterwards no matter how good the design was. Fact is until it hits the factory floor and works people will always be critical (sometimes even after it works, look at what some people say about the RX-7 engineers).

P.S. I thought you were going to say you used an EDM to cut the dynamic chamber. Jigsaw? I was so disappointed. Keep up the good work.

 

Thaniel: I understand criticism. Its all good.

RX-7Impreza: The gains ARE miniscule for the afm porting. You will not feel it. Butt dyno won't even be fooled. Most people should be too scared to try it. That thing is expensive and easy to mess up. It makes a small amount of difference. Like flubyux said, many small gains will equal a larger one. Other things need to be done with it as a group to even begin to feel it.

I've been really busy this week and haven't had time to work on anything lately. I did fiqure out how to keep the injectors on the top manifold but not have them intrude to the airflow at all. Would make adding forced induction on an n/a easier since the injectors would be out of the way. Also figured out how to bolt on a stock T-II turbo directly to the engine without a spacer on the n/a manifold equipped cars! I'll work on it later.

 

I cut up the plenum off my extra S5 n/a manifold tonight. Metal bandsaws kick *** But after I get my motor broken in, Ill have a back to back comparison of stock vs ported plenum on my ported motor.

 

It's funny because it's true!!

RotaryGod, I finnally read all the posts. Didn't see if you had to mod, port the S4 lower or S5 upper to fit. Bolt pattern match?

I have thought of putting on the S5 upper. Keeping the S4 lower seems to make sense to me but most writeups for putting on the S5 upper say to replace the lower.

I would Also like to polish the intake runners. I thought of trying to use a bottle brush hone. Any thoughts?

 

Thaniel: The runners and all but 1 of the bolt holes line up. The rear one does not. I drilled a new one in the S5 upper manifold but it is EXTREMELY close to the rear runner. I used an allen head bolt since the head was small. Very tight fit. For polishing I use a 4" abrasive disk on a right angle die grinder. Most people don't have one but they work really good. Then I go back by hand with various grits of sandpaper before polishing. Very time consuming.

Mazdaspeed7: Good luck. I hope you like the results as I did. If you don't then at least you can go back to your stock one. Spend alot of time at the intake runner openings. Give them the most gentle radius that you can for good airflow. This is where I spent alot of my time.

I have gone back and re-evaluated the intake porting on the S5 manifold that was posted in another thread. I did do it to mine and found that the top end did improve at the expense of midrange power. Since I removed the location of the secondary injectors and ground out their intrusive mounts I don't need the runners to be larger (ported) here. I went back in and filled in the port job with epoxy (Damn brave of me!!!) and actually filled in farther up the runner to the point it begins its little expansion. The stock runner cross section area gets bigger before it gets to the injector. Now mine have a constant cross sectional area through the whole length. The short turn radius on the lower was restored back to the factory specs as well. What I found by doing this is that not only is my midrange power back but the top end is STILL as strong as the ported one. Velocity, gotta love it! Don't know if it would have been as successful with the stock injector location in the way though. Hmmmm?

 

well I hate to dig up a really old thread but I am curious about the s4 turbo intake compaired to the s5 intake.

it appears the s4 intake secondaries are towards the outside, and the primary throttle body bore is broken off into the two inner intake runners.

now when I look at the s5 cut in half it is the total oppisit?

are my eyes playing tricks on me?

also why on the s5 does the primary bore break to the two outer runners and the secondary bores into the two center runners when it appears the two secondary fuel injectors are placed on the two outer runners while the two primary injectors are placed on the two inner runners?

 

On S5, the position of the runners change at the VDI valve, so where the secondary injectors are is really the secondary runners.

 

so they basically criss-cross back into the proper positions?

thanks