mike1324a

I have the umnitza carbon fiber intake and I just got dyno tuned yesterday by scott at mazsport. He was raising the numbers slowly and realized the intake might be holding it back some. Well he took it off and changed no timing or fuel and gained 5 horsepower at the wheels!!! We came to the conclusion that the filter elemant of the intake was very poor. I plan on going back to the stock box and getting the racing beat ram air duct until i can find a suitible replacement for that filter. He didnt believe the carbon housing was restrictive bue to its large opening but the filter is garbage! I thaught everyone might want to know this!

Razz1

Yep, that's the report on aftermarket intakes, except racing beat.

TeamRX8

iTrader: (25)

wrong, he's saying they just pulled the filter element off i.e. ran it without a filter on the end

Razz, please quit parroting that same BS over and over again, m-kay? It can be done ...

not surprisingly really, it doesn't seem to have much filter area, adapting something won't be easy due to the box shape, AEM dri-flo would be nice if it can be adapted/fit

VarneyMazda

What about just a screen over the intake?
probably not good for street driving the rain.

mike1324a

Correct. We ran it without a filter and gained 5whp. The filter size is bad but the flow is ever worse! I dont I love the housing but i will have to find some kind of filter that will fit in the box but like you said, it wont be easy. Anyone got any ideas?

TeamRX8

iTrader: (25)

based on what I've seen you need a flat plate with a tube extension that will mount up to the inside of that housing and allow a slip-on filter to be clamped on

1stgen8

iTrader: (1)

I have seen k&N filters that look like they will fit. I will do some research and let everyone know.

Moonrover333

welp my .02 is this. i have the first gen of this intake with the old big pipe and no screen and i just switched back yo stock box and filter. it feels incredibly slower and choppy powerwise. i don't get it. it may just be a dirty filter tho. ah well i can't trade car in so ill be putting it in again.

ddub

On every single aftermarket intake for the rx8? Proof? Show me data on every aftermarket intake available that proves your statement or please don't spout off lies.

otherside

CAI's suck!

Mazda-Rati

Makes one think if the K&N ver.2 is as restrictive since they seem to have the same filter design

mysql101

As long as it sounds louder, what's the problem with losing 5 or more horse power.

Less air flow means less chance of dirt getting into the engine. That's quality stuff.

mike1324a

I have one of the first that were available and like moonrover, my tube is bigger and it has no screen. An when it comes to horsepower on the 8, 5 matters alot for us N/A people who are uber lacking in power. When i get ahold of that mazsport turbo it will be a different story but right now i have to grasp every little horse i can get.

Moonrover333

welp after actually paying attention to my car more today. the stock airbox seems to pull a lil harder at speed but from a dead stand still the Simota feels alot better, especially when leaving a stoplite. hmm also i don't see the filter exit being too small. possibly is the huge nosecap. i'll snap some pics for reference

rotarygod

The Racing Beat system probably gives the best average power gain (which isn't much) but at the expense of not giving the highest peak gain. the K&N system should actually have a few more on the extreme top end but not as much over the entire powerband. Keep in mind that none of these systems is enough of a gain to feel so any power gains will only be seen on a dyno.

Red Devil

Another reason that I think I'll stick with my K&N panel filter.

maxxdamigz

iTrader: (1)

The question is: how much HP do other filters rob? All filters are a flow restriction. If this filter hits you for 5 but another filter hits for 7, this one would actually be better. You have to go dyno the stock air box with and without filter now! The carbon fiber intake box is pretty sexxy looking though.

j9fd3s

i drove a car with a mis-installed SR intake (afm was backwards) and while it didnt run under 4k, it was faster over 4k than it was after we put the stock airbox back into it.

it could also be that the non running, and then sudden take off just felt fast

Moonrover333

ok here are the pics
this is from the back of intake (looking from engine to filter) and my knee


and a close up of same view


and a side shot of just filter


i think its either the opening of intake or filter size or material that could be holding it up and btw ANY intake without a filter will def show a significant power gain

rotarygod

This is true but you need to put it into perspetive with a frame of reference. Yes all filters are a restriction to flow. However if a filter an flow as much or more air than the engine needs, it isn't a restriction to the engine. You only need as much flow as the engine needs. Anything more doesn't matter.

Lasse wankel

I have tested the K&N filter on a SUN rolling road and power went down 2-3 hp. Even took away the filter element and lost 3 hp. I have ordered the Simota carbon box will have it in a few weeks and put it to the test on my RotoTest dyno. Should be interesting to see the results!

/Lasse

rowteree

interesting..i too have a simota intake...makes me wanna get rid of it and put the stocky back on

TeamRX8

iTrader: (25)

their Simota intake cross-section at the MAF fitting is significantly different than OE, that's a big no-no IMO unless you recalibrate the software

gr8rx

I should be getting the intake in a few days from moonrover and I have an apexi power series intake in my other car which according to many tests Ive seen gives the most power filter wise......Im gonna see if I can get that filter to fit in the cf enclosure .........team rx8...what do you mean by the crossection?

1stgen8

iTrader: (1)

I got rid of mine and custom made my own CAI using 3.5" pipe and a better filter. Right away I could feel the difference in my car. I think those intakes are pretty pieces of junk. The pipe size and filter are the problem on those intakes.

page 3.....
https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/custom-cai-wish-me-luck-103093/