Hello!

Lately, I've noticed something a little different from my WRX. I see a lot of dyno charts that have crooked powerbands instead of smooth bow of lines. I try accelerating from 2500rpm and as it goes up through the rpms, the engine seemed a little hesitant that if it were to run on a dyno, it would print out crooked lines. Does that make sense? It does start to smooth out at higher rpms at probably 4500rpm or so. I feel very faint hesitation as if I'm slightly letting off the gas pedal in and out.

Is this normal occurences to a stock WRX? Or is it the lag of the turbo as it gains enough boost to completey fill the engine? Now, I'm wanting to have it tuned by Vishnu! *sigh* Only if I have enough money right now...

Thanks!

 

Search for open/closed loop delay.

 

^^
Yeah. What year is your car? I think the '04s had the OL/CL delay problem, and I know the '05s do. It is really bad on my '05 wagon. Sucks ***.

 

Thanks!

I appreciate you not saying "Search you fool!". People go out all the time telling the line, when you really don't have the information what to search for (sometimes).

Sonicsuby, I have a 05 WRX. I'm aiming to get it tuned by Vishnu, seemed like they got it figured out!

https://www.i-club.com/forums/showth...sed+loop+delay

 

Does this problem affect earlier WRX models? My 02 has a really nasty hiccup right about 2000 RPM when WOT, which is terrible in 1st and 2nd gear, and noticeable in 3rd; it almost feels like the entire engine "skips a beat," the drop in power is that severe. I drove it with my mechanic sitting in the passenger seat, and he said it was pretty typical and not harmful, and not enough to get me a new ECU on warranty.

I'm worried that when I start adding power, this problem will be amplified and get worse. Hopefully an ECU reflash can smooth out the "flat spot"...

 

From what I've read, it only affects 04's/05's. But I'm sure a good tuning job can fix that problem of yours. You might want to call any local shops around your area or Vishnu; I've heard only good things about them, give them a call and see what they can do for you. Refer to the link above your's.

 

I've noticed this on my 05 wagon as well. It feels like a delay in power production between 3500-4500 rpm. After 4500 it accelerates well. This did not happen with my 02 sedan...

Is there any cure besides a reflash?

 

It's the stock ECU itself, it's the way Subaru did it... so I'm not sure if there are any other cure aside from having it tuned/reflashed.