rudy8

i installed the Rotary extreme intake and find a slight hesitation around 4200 and other times when i increase acceleration at almost any speed. it only lasts a millisecond but feels like the car "misses" . After that, it accelerates smooth. any one have similar feedback?

Dugless

I noticed that with the Typhoon as well.....

93rdcurrent

Do either of you have exhaust done as well?

tommy12g

For that reason i say, K&N drop in is most effective way to go, or just stay stock!

rudy8

actually, i heard K & N is much worse. mine ive noticed over the last day or so seems to be doing better, especially after warmed up. still, just a touch of hesitation. overall, the sound has become addictive and am more and more comfortable with the change... what have you done with yours, tommy?

rudy8

no not yet...my borla is on the way.
rudy

RX8on19s

Rudy,

I would check your install just in case. My RE intake works perfect.

tommy12g

I only have the K&N Drop in

Fanman

I noticed that you have the CZ Stage 1. Many people report a slight hesitation in the middle rev range before it picks up a surge in power (around 5000 RPM), could that be an issue ?

rudy8

no stage 1 yet...only mod so far is the RE intake. I notice hesitation when i start off from a red light,(like a stalling )
i noticed that i installed the air mass meter on the side of the intake tube rather than on the top as shown in the instructions and will change that tonight, if the electrical cord attatched is long enoough. for some reason it seemed short so i just mounted it on side. i will notify tonight. since i am the only one having this problem, i imagine their is some problem with MY install...can you believe it?!! thanks for your responses and i will post my results as they unfold.
rudy 8

rudy8

i moved air mass meter to top of intake tube as opposed to the side. no more hesitation. also, added foam insulation under heat sheild for noise reduction and that made the intake more liveable.
rudy

IKnowNot'ing

Mazda (and vendors) engineers spent about three years designing and testing the intake system, including the spout and airbox. Moreover, if there is a MAFS, it was calibrated with the standard upstream intake elements fitted. Any change in this set-up will make the MAFS read the wrong mass air flow.

K&N and others probably spent a few hours taking measurements in an engine bay at a nearby dealer and designing a kit which fits the available space.

Don't be surprised of rough idling and 'misses'.

rudy8

it was that way when i had mafs mounted on side (not per instructions provided by chuck!) so when i remounted it correctoly, it now idles beautifully, no missing and great sound.
it always pays to follow instructions!
RE: K & N...i have heard they cobbled together a terrible intake but ROTARY EXTREME seems to have done thier homework.
rudy

lugerxu

mod edit Bashing other members will not be tolerated. Do not post this crap again.[/i]

mikeb

go away

j1mb0x99

did he just say gyno charts?
Do they measure pu$$y power?
lugey is my new favorite member.
His posts crack me up.

-JiM

breezy_rx8

I agree with IKnowNot'ing. It doesn't take a rocket scientist to figure out just by looking at the stock air filter that it is pretty well engineered as it is! There are stock cold air scoops feeding the air filter. The filter is short, wide and faces the wind. Aftermarket air filters might give older vehicles more kick. Todays RX8s are fairly flawlessly designed by competent japanese engineers. It doesn't surprise chuck ****'s garage design air filters are now having problems. I'm sure glad I didn't waste my money on that. ****'s a crook. If you want more pep, go with a mazdaspeed lightened flywheel. Afterall, if you have a Mazda dealer install it, the warranty is not void!

Rotary Extreme

You obviously have no idea how the stock intake works. Filter facing the wind? Do you know that there is no ram air effect on the stock intake? Air gets sucked in by the engine. There is no wind. Mazda specifically made a guard to block off any "wind".

Who are you calling a crook? Did I rob you? Out of 60 intakes I have sold, 3 got returned because the intake causes hesitation on their cars and the buyers all got their full refund. Now I posted the info on the testing that people should do before they purchase any kind of aftermarket intake and I am a crook?

RX8 is flawlessly designed? I just got two letters from Mazda on recalls on the passenger side air bag and transmission dynamic damper.

It's funny that peope who have no knowlege have all the opinions in the world and now you recommend people to install lighten flywheel?

Chuck Huang

JERCS

In regards to chuck being a crook, I wouldn't know!

Bought mine from him and he usually (I think) emails you when you buy your intake. I asked him to call me, and he did. Intake arrived faster then I expected.

I will buy from chuck again in the future.

breezy_rx8 your accusitions are unfounded, what is your proof the Chuck is a crook?

breezy_rx8

**** is no engineer. If you feel comfortable purchasing a homemade intake with known hesitation issues, that's your call. He's selling an intake that somehow magically "cools" the air because of his aluminum "heat shield". Metal around air does not make air colder. How about on hot days. If you take a close look at the stock setup, you can see air scoops feeding the stock filter. Mazda engineers aren't stupid. They are squeezing every bit of performance out of that tiny 1.3L.

If he's giving refunds I can't call him a crook. However, it doesn't all surprise me that his homemade filter is now having issues.

The advice about the lightened flywheel comes from an experienced mazdaspeed RX-7/RX-8 mechanic.

JERCS

breezy: What's the difference between the K&N and the RE?
Agreed that mazda did an awesome job on the stock intake.

But feeding the engine? I thought the engine sucked it in as chuck said.

Rotary Extreme

The more you talk, the more it shows how ignorant you are.

Hesitation does not happen on every car. There have been recalls on rx-8 and if you think all rx-8 are the same, they are not. That's why it works on most but just a few cars have hesitation.

Heat shields block off the engine hot air. The air gets sucked into the engine is still coming from the fresh air duct. Remember the word, "sucked". There is no ram air effect no matter what you think. Ram air does not work with the MAF sensor. Do you know how fast air is moving into the engine? It takes time for heat transfer so even though yout think the heat shield will heat up the air, it doesn't. You also don't understand the concept of heat capcity. The plastic stock air box will be at the same temp but due to different material with different heat capcity, it might feel "cooler". On a hot day, the air sucked in will be hotter becuase the ambient temp is higher. Why don't you pop your hood and measure the temp with a pyrometer. Don't try to tell me that on a hot day, the stock air box can get cooler temp than ambient.

What's a Mazdaspeed rx-7/rx-8 mechanic? Never heard of such thing.

Why don't you get a flywheel yourself and show me some numbers. A lighten flywheel might seem lighter but you will need to use a counter weight with it. The overall decrease in rotational inertia is less than you expect. On top of that, the rpm will drop faster when you shift so unless you can shift pretty fast, you are not going to go faster. You can get more power to the wheel but how much?? Spend $400-500 on the flywheel and spend another $200-300 on labor for 2-3 HP?

About my educational background, what do you know? It shows again that people without knowedge have the most opinions and your case, assumptions in the world.

Chuck Huang

breezy_rx8

Jercs-

Well, Chuck points out his filter is smaller therefore there's more room for air. At the same time, could his smaller filter be a bottleneck? Chuck says no, that his filter is already sufficiently big enoug and that the K&N is overkill. I'm not a Renesis mechanical engineer and neither is Chuck. I tend to trust K&N over **** as K&N has engineers design their filters. Chuck will point out the K&N filter is open to the hot engine bay. That is true. The RE filter is still within the engine bay (whether it has a "heat shield") or not and is still subject to the hot engine bay in due time.

I guess my wording was not good. It's not necessarily "feeding" air into the intake as say a turbo/super charger forces air in. But there is some air ducts that capture air directed torward the filter.

If your RE filter is working for you, I'm glad to hear.

Everyone has their own opinion controversy is inevitable. I will let everyone know after the mazdaspeed flywheel is installed. There's no gimic about the flywheel. It's all physics. Why don't they install the lightweight flywheel to start is the obvious question. Well, a heavier flywheel gives more engine momentum and therefore the engine runs smoother and more gradual. This is good for most people. For those who want max acceleration and are willing to put up with getting used to the feel of the flywheel, hands down it is the best bang for your buck.

breezy_rx8

Chuck-

Are you an engineer. Yes or No.

breezy_rx8

Hymmm.

Isn't it a coincidence that cars with no previous hesitation now have hesitation with Chuck's intake?? He can't blame Mazda for his premature filter.

Your heat shield doesn't block jack. The filter is in the engine bay whether you like it or not. I never said the stock filter will get colder than ambient temperatures. Neither will your filter! Why do you even call it a cold air filter? That's a joke!

You have never heard of an RX-7 mazdaspeed mechanic? Try going to any mazdaspeed mazda dealership and see if they have any old RX-7 expert mechanics who now work on the RX-8s.

I shall take my mechanics advice (and my engineering background) and go with a flywheel. Thanks.