wthdidusay82

iTrader: (15)

I am considering keeping my 5/6 ports but then again i am considering taking them out... still not 100% sure yet, give me your opinions on the differences with them in vs out and what you think is better

I know people say it gives u more top end is this true or myth ? and how much does it affect drivability with them out ?

with them in will i be makin alot less hp ?

Syonyk

Keep them, fix them, and run them off a small air pump & RPM switch.

I have mine on a switch right now (haven't gotten around to building the RPM switch), so I can play with them at will. I also have Pineapple inserts, which are well secured. I also have no cats.

With the ports closed, the engine is fine down low, reasonably fine up high, but doesn't have any real interest in making big power past ~6500 RPM.

With the ports open, the engine is absolutely gutless down low (below about 3000 RPM). The pedal has less feedback to it, and you have to add a lot more throttle to get anywhere. Not enjoyable, IMHO. However, up high, it makes a big difference. Around 5000 RPM, you feel a bit of a surge, and the engine just pulls hard up to redline.

For a purely track vehicle, sure. Take them out. For a street driven vehicle, leave them in and make sure they work.

-=Russ=-

wthdidusay82

iTrader: (15)

with the ports still here will i still be able to make power up to redline or possibly past redline, my car is mild streetported so i figure i should make power at higher rpm than i did stock

Syonyk

Yes, you'll flow just fine. You might gain a *few* HP at the top end by completely removing them, but that's debatable, because the airflow through those ports is kind of crappy, and with them removed it's even worse.

However, the tradeoff for that few HP up at the very top end is gutless bottom end. And, especially for autocross & such, you'll probably be spending some time at slightly lower RPM, and you'll end up just waiting for the engine to get into it's revised power band.


-=Russ=-

lastphaseofthis

iTrader: (8)

i have them removed on my 88 GXL, and there is a big diffrence.
pros=
lots power from 4.5k to 8k, no doubt about it.
no worrying with extra equitment(switchs, pumps, actuators)
no cost of the extra stuff
less weight( although not alot)
Cons:
idle is so so when cold,
very poor response >4k
.
unless you bridge port your engine on the aux. ports, i would take them out, you will gain a good bid more then ppl think up high. pineapples are a must.

wthdidusay82

iTrader: (15)

i want to get mine engine started this weekend though, i dont get why the pineapple sleeves supposedly give more hp... is there proof ?

if i keep my stock 5/6 port setup how can i get it to run without using my airpump ? i took mine off and i broke the bolt for the bracket for it so i cant put it on

ireally want to have my car running this weekend , if i use the 5/6 port setup it wil have to be without the pineapple inserts, i could get them later on and put them in

either that or take out the 5/6 ports , but i hear its not good for streetdriving

how much does it affect your street/highway driving ? since most of that is below 4k, cuz i may just keep them out just since i dont have the time to wait for the parts to come in that i may need

Syonyk

As I said, I've driven around at low RPM with them open, and I don't care for it.

A lot of people get used to it, but... it's not like there's a lot of torque down low to begin with.

-=Russ=-

lastphaseofthis

iTrader: (8)

i drive my 7 every day to and from work, to and from ppls houses, its absolutely fine i would depend on this car from here to canada.
its just the performance down low isnt great, i probably have less torque now then stock.

SureShot

You want them working.
They are you friend.

The piston guys spend big bucks in search of the broad power band we get with the rotary.
Don't give it up.

wthdidusay82

iTrader: (15)

yes true but the rotary doesnt make much power down low anyways...but i heard taking them out can give your more power from 4k-8k , and if youre racing that would give you the punch you need to win wouldnt it ?

pineapple sleeves claim to make 5hp at top end but with the ports out completely u will probably make that or more wouldnt u ?

i wish someone had proof on this from a dyno but i think with them out you will yield more hp than with them in

for a mild streetported car, would it be more beneficial to keep them or take them out ? its mild ported by kevin landers aka rotaryresurrection

edit - im planning on having my car pretty decently modded so i think i would be benefiting on the peak hp

mods so far are - mild streetport rebuilt engine, lightweight flywheel (17lbs), centerforce dual friction clutch, mazdaspeed hardned motor mounts, ported tb and butterflys removed , k&n filter (have cone one and one for stock airbox), magnecor 8.5mm wires, ps - ac - airpump removed, and about another 25 lbs of weight reduction

future mods - rb header/collector w/straight pipe , safc, 2.5" single exhaust