I'm interested in purchasing a set of test-pipes/hfc's to make my car louder.

After some extensive research I have concluded that test pipes/hfc's bring a lot of unwanted attention to these cars.

Problems include:

1. CEL Light
2. Hesitation/Bog (Mostly around 3k RPM)
3. Tuning Issues (Running Rich/Lean)

* - Worst problem is that no one has a 100% fix. (Non-Foulers, Steel Wool, & Brilo)


I would like to know if anyone has a solid solution to these problems. It would also be nice to see how many people are actually having issues with their set-ups.

 

well first of all yes you are pretty much going to be running straight pipes with test pipes so it is going to be louder. with stock exhaust its not really to noticable. how the fix with brillo is just fine. idk why it would matter as long as it works. now running rich usually always happens with test pipes that is why the make a thing called a tune. for the extra added hp and just to put a little brillo in the hole more than makes up for it.

 

1. a CEL light is dependant on the construction of the pipes, and the year of your car
2. any change to the exhaust should be accompanied by a tune. Is it 100% mandatory? No, the car will still run without an optimized tune, but to make the most of the mods, a retune is highly suggested

 

the tune will fix all your problems. you should of looked a lil harder.

 

I'm running my own custom test pipes, with no problems so far, then again none of the products i release have problems

 

so 360bhp and how did you acheive this? would like to see your intakes?? custom xpipe exhaust????

 

still in testing, once we have everything ready for release they will be announced. like stated on another thread, the intakes will require an ECU re-flash

 

bhp = @ crank

 

I believe the hesitation issues are caused by damaged O2 sensors. The O2 sensors on the exhaust manifolds are sensitive and can get easily damaged by the use of an impact wrench or hammer.

You don't really need a tune if you only have HFC's.

I'm running Invidia HFC's with no antifouler installed and no CEL either.

 

I got the hesitation too around 3k. I only get it if for example I floor it when I'm at 1.5k rpm. Is that the hesitation you're talking about? I have ART pipes.

 

I also have the ART pipes and am having that same issue. I reset my ecu but am still having the same problem, but no CEL. I guess I just gotta get a tune. Was gonna wait til the spring but I may use some x-mas money for a New Years tune.

 

I also have ART pipes and get the low-RPM hesitation, even WITH my custom tune...

 

Just switched out my ART TPs with some Berk HFCs and the low-rpm hesitation is gone.

 

^^^ that's very odd... can any tuners chime in?

 

He must be talking about the low end torque loss with test pipes. HFC are more restrictive than test pipes. He probably feels more of that from the butt dyno.

 

all of the hesitations we have experienced from TP's was able to be tuned out through UPREV...but untuned the cars drive poorly...IMO

 

No, no I mean when I was in the low-rpm range, held it there for a few seconds, then mashed the throttle, the car would hesitate for a split second before accelerating. This was after and hours worth of tuning. After installing hi-flow cats, the low-rpm hesitation went away. This is discussed more here (page 2):

https://my350z.com/forum/intake-exha...e-setup-2.html

 

I have HKS True Dual with Berk Test Pipes. I didn't get the CEL for 2000 miles but then I got one. I had it cleared with a code reader and didnt get one for a while. I got another one recently but it went away on its own. These are the only problems I have.

 

i am not sure or just my concern, but some times after install the dual jwt pop charger & berks hfc i feel lost a power at low rpm through acceleration..what your guess ?thanks..

 

i had aam testpipes exhaust intakes etc with a cobb flash and had no hesitation pulled real nicely