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Old 11-27-2002, 06:06 PM   #1
MadRex
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Join Date: Oct 2002
Location: Columbus, OH
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2002 WRX wagon
silver

Default WRX Power Smoothness

I have a stock '02 WRX and I notice the power does not come on smoothly. As revs build the power comes on, then fades, comes back etc. It's not turbo lag since it occurs throughout the rev band. Is this normal? It's done this since new in 4/02.

I never noticed this with my '91 300ZX twin turbo.

I am planning on many engine modifications but want to make sure everything is OK to begin with. My G-Tech Pro Competition says 0-60 6.2 sec. and thats being fairly easy with clutch slipage.
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Old 11-27-2002, 08:05 PM   #2
ChrisF
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Location: Marin, CA
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For the most part the answer is yes, that behavior is normal.

The stock car has quite a bit of lag below 4000 RPM's, then boost falls off in the higher RPMS. If you think the power is not so linear now, wait till you start modding the car. With freer exhaust or bigger turbo, bigger injectors etc, power comes on HARD at between 3600-4200RPMs but holds hard until redline.

You can tune your car for a more linear powerband, but it seems to me the nature of this beast is much more peakey.

If you want linear either go normally aspirated or with a Rotary
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Old 11-28-2002, 12:25 AM   #3
jlw
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Element Tuning GT65r/hdrs

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I had a bit of a torque dip around 5500 rpm. Noticable at WOT, dealer said it was normal ... noticed it on a few dyno plots of stock setups at turobxs. Check out their before & after dyno plots.
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Old 11-28-2002, 01:20 AM   #4
Rich10
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WRB

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There are things that you can do to make the power smoother. With my mod's, uppipe, midpipe, pulleys and samco hoses, the boost comes on smoothly from 2,000 to 3,000 and feels almost normally aspirated. The key was removing restrictions from the exhaust to let the turbo spool quicker.
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Old 11-28-2002, 03:13 AM   #5
jlw
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Element Tuning GT65r/hdrs

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I fixed mine also, TurboXS Stg 4/TMIC/UTEC ... new problem, my arms have grown an inch longer just hanging on during the WOT takeoffs
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Old 11-28-2002, 06:29 PM   #6
BullsWRX
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i have a club spec + uppipe and the power comes on in my car very smoothly. Out of all the cars I've ridden in which had parts/chips from other tuners I think mine is the smoothest. But then, I had mine dyno tuned, and none of the other cars were.
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Old 11-28-2002, 06:34 PM   #7
NYC TURBO
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Try a grounding kit or do a grounding mod yourself. If any of your grounds from the factory are not solid you will crtainly feel power surges and dropoofs throughout the rev range. My hones oppinion is to ground as many points in you car as possible either with a kit or with 4 or 8 guage stereo wire and high quality connectors.



Lee
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Old 11-28-2002, 10:41 PM   #8
CatchME
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You could get Vishnu's EMI Adapter. It claims to smoothen out alot of things Here is the link. EMI link I'll have mine this week
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Old 11-28-2002, 11:51 PM   #9
MAD REX
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MadRex
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Old 11-29-2002, 12:50 AM   #10
jlw
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Element Tuning GT65r/hdrs

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utec == total control
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Old 12-13-2002, 01:15 PM   #11
MadRex
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silver

Default UTEC = Smooooth!

Installed UTEC stage 1
Now smooth.
Thanks for your replies!
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Old 12-13-2002, 01:54 PM   #12
jlw
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Element Tuning GT65r/hdrs

Default

/soapbox/
It might be assumed that I may have TurboXS stamped on my a$$, not that I can tell.. But, the UTEC, by itself, is the best thing since sex & not nearly as expensive. Its potential has just begun to be tapped. I wish that I could have had it before I went stock -> Stage 4. I might not have put the Stg 4 in, not complaining about Stg 4. It is just that the UTEC adds a very high degree of performance & sophistication ... for 15 minutes of install time ... to the WRX, as well as any other likey application for it. AND, future growth make it a very dyamic product for the future.

All the time spent on worthless ground mods (obviously my opinion) with at best questionable results, at worst no change; to even out the acceleration response ... the UTEC fixes that. The point of the current thread.

(As an electrical engineer, I see the typical ground mod install as a potential for adding counter-productive ground loops.)

/add another box to the soapbox/

To all the, "I have >$1000 burning a hole in my pocket ... what do I buy?" threads. If you won't send the money to me (because I'm a nice guy & am breathing) do yourself a favor & get a UTEC.

I just made a couple road trips since the Stg 4 install. One to Boston & one to Ill, from near Harrisburg, PA. I drive 75 to 90. I averaged 27.6 mpg. Of course I no longer go to the dealer; of course I am out a few more bucks, of course I am no longer frustrated nor is my intelligence insulted & I haven't pi$$ed away anytime with the dealer. BTW Their Subaru salesman likes the Stg 4 + UTEC and has advised me that "you" will never get anywhere with "these guys". Meaning his own service department! Therefore, do yourself another favor, & find a good independant shop for anything other than the obvious expensive warranty stuff.

Last edited by jlw; 12-13-2002 at 02:00 PM.
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Old 12-17-2002, 10:04 PM   #13
MadRex
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2002 WRX wagon
silver

Thumbs up UTEC = Fast

Stock: 0-60 6.2 sec. power not smooth.

UTEC stage1: 0-60 5.2 sec. and smooth!
13.9 sec. 1/4mi.

No tuning!

Injen CAI (modified to POD)
GFB BOV
Blitz TT
G-Tech Pro Competition
Wagon
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