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Go Back   IWSTI.com: Subaru WRX STI Forums > IWSTI Engine & Drivetrain > 2.5 Liter/Litre Factory Motor


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Old 05-02-2008, 07:07 AM   #1
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Default 2008 Power Cut

I was out driving yesterday and was winding the car out. Around 6500 i noticed that i got some kind of power cut. I didn't know if this was because i was getting near the rev limiter or not. The shift light had just begun to blink so i am thinking that i just hit the limiter. If anyone knows the stock rev limit or has experience this...let me know


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Old 05-02-2008, 10:29 AM   #2
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Default Re: 2008 Power Cut

The stock tune on the 08 sucks a$$ (I'm assuming your car is stock). The power fluctuations are most noticable in higher gears (3rd gear and up). If you're thinking you're getting fuel cut or hitting the rev limiter, then that could be something totally different. The power fluctuations I'm talking about aren't quite that drastic. Your problem sounds like it is worthy of a visit to the dealership.
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Old 05-02-2008, 10:45 AM   #3
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Default Re: 2008 Power Cut

if that red light blinked you hit the limiter.
Im used to higher revving engines and was doing it from time to time, esp in first and second when that needle swings suprisingly fast. after a few times i learned because the experience isnt exactly smooth.
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Old 05-02-2008, 11:53 AM   #4
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Default Re: 2008 Power Cut

From my experience, the boost peaks at/around 5.5-6k rpms and then falls off. This is a design of the tune so your not getting boost creep and it's gear dependent and mode dependent. Feels like the car gets short of breath or something! Very different feeling than a fuel cut (right past the red RPM zone), which is like an instant 'off'.

An accessport seems to smooth it out a bit and makes more power too.

Also, my red light is a shift light set to 6k rpm not a limiter of any sort.
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Old 05-02-2008, 04:50 PM   #5
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Default Re: 2008 Power Cut

You probably banged into the rev limiter, though you must have been booking it to do that in 4th.
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Old 05-02-2008, 05:27 PM   #6
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Default Re: 2008 Power Cut

Quote:
Originally Posted by Dante View Post
From my experience, the boost peaks at/around 5.5-6k rpms and then falls off.
that's why i set my shift light for 5.3k. it spools so quickly in the lower gears that it gives me time to, usually, avoid the rev limiter. plus, banging off the rev limiter serves no purpose when the power curve is dropping before then.
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Old 05-02-2008, 06:14 PM   #7
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Default Re: 2008 Power Cut

How do you adjust the shift light? Are you guys setting the rev limiter on or off and to what number?
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Old 05-02-2008, 06:43 PM   #8
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Default Re: 2008 Power Cut

you cant change the rev limiter unless you get a pro-tune. Press the odo reset button for the shift light.
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Old 05-02-2008, 06:48 PM   #9
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Default Re: 2008 Power Cut

I thought the odo changed the rev to "on" or "off" and to the number you need.
Just to clarify: The red light of death is the rev limiter, and the little green triangle is the shift light.
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Old 05-02-2008, 06:52 PM   #10
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Default Re: 2008 Power Cut

Quote:
Originally Posted by fstwrx02 View Post
I was out driving yesterday and was winding the car out. Around 6500 i noticed that i got some kind of power cut. I didn't know if this was because i was getting near the rev limiter or not. The shift light had just begun to blink so i am thinking that i just hit the limiter. If anyone knows the stock rev limit or has experience this...let me know
what mode are you driving in? im guessing you are at wot when this happens? my sti used to do what you are describing. i would pull at 3/4-full throttle and at around 5500-6000 there is a cut off but redline was not reached. i had that happen in I mode. in the s and s# i would feel the pull of the car in spurts kinda stuttering for a lack of a better term.

the factory tune is really bad as other have pointed out. after the cobb stage 1 flash, the car feels much different, very smooth and no more of that stuttering and power cut.
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Old 05-02-2008, 07:10 PM   #11
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Default Re: 2008 Power Cut

Quote:
Originally Posted by PortlandSTI View Post
I thought the odo changed the rev to "on" or "off" and to the number you need.
Just to clarify: The red light of death is the rev limiter, and the little green triangle is the shift light.
Not exactly right. The red light is the adjustable shift light. You can set it to light at any rev that you want, and choose to have the buzzer sound at that time as well. As you can set it, it is obviously not directly connected to the rev-limiter. The green triangle is the "optimum" fuel efficiency shift indicator and is only shown if you're in I mode.

The OP simply hit the rev limiter.
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Old 05-02-2008, 07:33 PM   #12
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Default Re: 2008 Power Cut

correct.

shift light (and alarm): user adjustable via the trip meter button

rev limiter: not meant to be adjusted by the user

green triangle: non-adjustable recommended shift point for best mpg while in I mode

I set me shift alarm (and light) to trigger at 5300 rpm since it's not long after that when the power band spikes and you're wasting time staying in that gear. Some few RPM later the rev limiter will kick in and cut power (you'll know if you ever hit it). It simply doesn't pay (performance or longevity wise) to go banging off the rev limiter all the time, since you're well past peak power before you get there and upshifting keeps you on the uphill side of the power curve.
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Old 05-02-2008, 11:04 PM   #13
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Default Re: 2008 Power Cut

So you set it to "on" and around 5500? Is there a physical cut off involved with setting the shift light? I felt the auto power drain once when i hit it and not later when i turned it to "off".
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Old 05-03-2008, 12:02 AM   #14
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Default Re: 2008 Power Cut

No there is no cutoff for the shift light, it is just a light and a beep.
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Old 05-03-2008, 08:52 AM   #15
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Default Re: 2008 Power Cut

I must have the shift light set so high it worked together with the rev limiter. I am going to read the manual and figure it out.


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