Since ive installed the Typhoon intake from K&N i was happy about the sound and everything seems fine...but now...i have that feeling that my car isn't so fast anymore...so last night i did a test on the highway and ...

(My car is NA rx8 2004 5 speed manual.)

1:stock...my top speed was:145mph

2: with Legamax HKS exhaust & K&N typhoon intake vers.II top speed:126mph

Is there anyone here who has had the same problem??....my feeling is that its changed since i installed my K&N typhoon intake...with just the hks exhaust it seems ok.
Im gonna do a test dyno run next week...maybe I'll find the problem there...but if anyone can give me advice here it's welcome. thx anyway.

 

As far as I know the RB intake is the only one that gives you gains,

The other will make you loose HP some where.

Looks like you lost your top end.


Try and ECU reset.

 

How old is your catalytic converter or plugs/coils? How longs the K&N been on the car? Is the filter clean?

I sure as hell didnt lose any power with mine

 

No way the five-speed should only manage 125, is your Typhoon the v.1 or the v.2?

The first edition uses hot air from the radiator, the revised version goes thru the metal into the cooler air in front of the rad.....

S

 

My intake is a version 2..everything in my car is clean and ok. ECU reset don't help...

 

Both intake & exhaust mods improve in air flow as we all know so the above suggestion of a clogged CAT seems the most likely contender. The factory CAT has enough trouble flowing standard power so its possible yours could cause trouble.

I recall the RX-8 book stating that the 13B-REW engine got a 5lt/sec CAT & the 13B-MSP gets a 3lt/sec CAT or somthing similar. Makes the flow for the factory CAT al that more critical.

Other options are the 6-port operation not working correctly due to vacum leaks or failed soleniods. An ECU code check & engine vacum check will clear those options for you.

REgards

 

Ahh yea, I forgot the port flaps have been jammed from carbon on some Rx8s

 

mine has the same combo K&N v2 and HKS legamax...didnt have issue on top speed or anything

 

did you had more torque and speed...or was it just the same? did u do a dyno test run? anyway i'll go next week to dyno test£..for now i have my stock filter placed again...untill i have done the test first with the stoch and after with the K&N....hopefully this will explain....

 

didnt notice any torque change...but i do feel a bit of increase power at the high end...n didnt do a dyno run...didnt expect much for an intake anyways...its mostly for the grunt sound..

Now that u hav the stock filter ...does the issue still persist?

 

Yea i think yea......i have power loss... i did a little drag :p against a bmw 318iS year 1997 and the bmw was the same torque as my rx8....the bmw has 143hp and mine 192(standard)+HKS exhaust...so if u ask me..i have a problem. and this is my 2nd engine..i had my 2nd engine in warranty because my first had also loss of end speed end torque problems.....tomorrow i will call stroe for dyno run. so i hope then i see were the problem is. just that i don't know were it just started all..i think it started when ive changed my filter for the K&N intake. maybe ecu problem..or filter sensor..pff

 

blah

if u ask RB which one will give you the highest top end, they will direct you to K&N version 2.

REVi gives you some increase across the whole rpm range, but K&N version 2 gives you the most top end.

The OP has a problem somewhere else. not intake/exhaust related.

I have only K&N version 2, I've been to 120 mph couple of times(only on a straight street with nocars in sight), and it was about maybe 5K rpm. so Im pretty sure I can push it to over 140 mph but NAH, not safe on a public street

 

Definitely have your car dealer visually inspect the cat. for clogs! This is common and can cause much lower power and problems. Don't drive your car hard until you take it in to the dealer and have them check it. Also don't let them only do a ECU check. They need to unbolt the cat. and look in both ends to see if the element has broken up or melted.

 

very true.

 

I went to the dealer today...he checked the ecu with a little laptop...everything seemed ok...i asked him to unbolt the cat...but he said if the ecu says its okey its ok...wtf..he was lazy i think...he said if u want to check the car u have to leave the car here for one day...but now i will wait..next week 2august a have an appointment for a dyno run...if the problem isn't gone after the run i go to the dealer again.

 

i did not know the 8 came with a 5 spd, i thought the auto was a 4 (2006 have a 6spd auto now) and the manual was a 6spd. and i doubt it its the intake/exhaust, i would get the plugs/coils/ or anything else that could cause lose at the top end

 

I put in my K&N Typhoon today and it sounds great and power is fine, but the CEL keeps coming on, at first it was just on and we checked to see what it was and it was a couple minor misfires. However, now it comes on maybe every 5 min and blinks a couple times then goes off. Anybody else experience this? Is this normal?

Thanks,
Drew

 

Don't waste your time on a dyno run. Just as I warned he is being lazy. Leave it with him for a day. The O2 sensor is in the middle of the cat. It won't pick up on any clogs that happen AFTER the O2 sensor. The catlytic element can get broken down and clog up in the back of the cat.

Here is a thread that points to exactly the same problem you have right now. Solution: replace cat. under warranty.

https://www.rx8club.com/nw-rx-8-forum-33/anyone-w-canscan-able-help-me-out-105288/page3/

 

Today i did a dyno run test...my car has the HKS legamax exhaust...every run...the first run is with my OEM air filter and the HKS Exhaust. its shows 162hp instead of (192normal stock car)

2nd run is with the K&N typhoon vers.2 installed.. and the HKS exhaust..it shows 176... i still havent changed my plugs or cat. because i dont know what to use..some told me i have to use TWIN SPARK plugs...is this good or bad?? and about my cat. some told me to just get rid of it..to replace it for a straight pipe...can it cause damage to the car(engine)?? the dyno man told me the cause of the hp loss has something to do with the maf sensor-air sensor..so tomorrow i will order a new sensor..the dyno guy also told me its best to stay OEM plugs if u change them. what ur comments?? all help is welcome thx.

 

Think again JACK.....

Top end is 8k plus.

How often do you drive at that range?

How long do you keep it at 8 k plus?

Your not gaining a thing since your only there for a fraction of a second.

Go ahead and fool your self.

 

nice gains!

 

Nice..yes de gain is ok..but the total hp is far from good..and look in the circle..u see that power loss it's not good..
I ordered my New MAF sensor this morning..with some luck i will have it monday. then i will see how my hp will be
here the pic...

i drowned the black line myself how it should be... normally with my echaust and intake it should be somewere around 200hp. I hope my new maf sens. will fix the problem

 

My understanding, and any of the tuners please correct me if I'm wrong, but that dip in your dynograph is due to the PCM adding fuel during the 3rd intake port opening.

I too experienced the same thing and had the crap scared out of me by other professional tuners who have no experience with the rotary. I guess the PCM doesn't always open the intake ports at the same time but anticipates the opening by dumping more fuel into the combustion chamber to make up for the increased air flow. The result is a slight power loss due to the engine running rich.

I've had the Typhoon II on my RX8 since shortly after I bought it. I dyno'ed about 3 HP less than 2 other stock RX8 MT that were present at the AZMC dyno day. This is also with a new cat-back and a mid-pipe. I'm convinced that the Typhoon II pulls hot air from the engine compartment instead of pulling cold air from the air duct.

I don't know how my intake charge temps might have changed since I gutted the air hose and now have a direct inlet to the intake.

 

Trust me, I keep it up there quite *often*

Dunno about the others, but the result is that I have refuel every 2-3 days (sometimes just 1 day)

 

I can't believe teh K&N gives that much of a gain.
sorry for your problem.
If you still have warrenty put all your OEM parts on and tell the dealer you did a dyno, and no hp. lol