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Old 01-02-2004, 02:53 AM   #1
JDMSubaru
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Default Redlining?

Can any of the pros out there give us their opinion on the effects of redlining?

I would like to do this more often but then again I worry if I am doing damage by doing this consistently.

Does anyone here redline or hang out in the 6,000 + range area on a regular basis?
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Old 01-02-2004, 03:00 AM   #2
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Default Yeah,

whenever I'm at the track, and sometimes on the street. And I use Redline oil and water wetter if that counts.

San
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Old 01-02-2004, 08:52 AM   #3
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The 7200 rpm rev limiter (fuel cut) pretty much protects against overreving. When you hit 6500 rpms (happens surprisingly fast in 1st and 2nd) its time for a quick upshift.
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Old 01-02-2004, 09:52 AM   #4
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I bounce off the redline in autoxes all the time ...
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Old 01-02-2004, 11:39 AM   #5
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7000 is part of my daliy drive(rev limiter is there to save your car, dont be afraid of it(but dont sit in your drive way listening to it ping ))

quick question... our rev limiter, does it cut ignition or fuel?



edit for spelling
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Old 01-02-2004, 11:47 AM   #6
MB38
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I've come from a BMW (low redline) background. I'm so used to bouncing off of a 5500-6000 redline that I always shift before 7000rpm. I've never actually hit the rev limiter. Obviously hitting the rev limiter has no detrimental effect as long as you back off of it quickly. It's there to prevent bad stuff from happening, so don't worry. When you hit it, upshift. If it bothers you, shift at 6900.
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Old 01-02-2004, 12:23 PM   #7
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never hit the limiter, but about once a week in the summer at the races I hit the redline going into every gear 2-3 times a night...my car is still in perfect health.
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Old 01-02-2004, 01:11 PM   #8
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I think as long as you build up incrementally to that dreaded redline and back off quickly, you're OK, just don't do it 15 times a day. On the other hand, shifting to second at 110 mph might do some damage
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Old 01-02-2004, 02:56 PM   #9
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Limiter is an ignition cut.

And I bounce off of it all the time, auto-x, drag strip, 60k miles, runs sweet.

Last edited by zombiedog; 01-02-2004 at 03:06 PM.
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Old 01-02-2004, 05:57 PM   #10
Subahaulic
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At 7200 rpms and full throttle, I don't think ignition cut followed by re-ignition as rpms drop is a viable option.
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Old 01-02-2004, 06:06 PM   #11
04WRX2NV
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Default

Quote:
Originally posted by Subahaulic
At 7200 rpms and full throttle, I don't think ignition cut followed by re-ignition as rpms drop is a viable option.
Yeah its a fuel cut as far as I know. Don't most cars use a fuel cut?
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Old 01-02-2004, 06:34 PM   #12
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if its a fuel cut, then the car will run lean during limiting.
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Old 01-02-2004, 06:44 PM   #13
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Keep in mind that the stock boost tapers a bunch toward redline, look at a dyno of a stock engine and after 6K power falls off a bunch. It'll rev that high happily, I love the sound in the upper revs with a short ram intake.

check out these dyno pulls
http://wrxworld.com/events/PDXDynoDayFeb/index.htm
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Old 01-03-2004, 12:29 AM   #14
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You should be more worried about being at/near the redline and accidently downshifting when you meant to upshift.


Full_Clip redlines his Craftsman lawnmower.
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Old 01-03-2004, 02:06 AM   #15
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OT, but Full_Clip. you're the man. i love reading your posts for the little comments you put at the end. keep it up.
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Old 01-03-2004, 03:01 AM   #16
Equilibrium Tuning
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I know we all love driving our cars hard, but you can't redline it 5 times a day every day and then expect your engine to last 100k miles. High revving and driving hard is deffinately hard on the engine and wears it quickly. You won't blow the engine doing it, but you WILL shorten its life. But hey, you have to drive it hard sometimes

-- Ed
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Old 01-22-2004, 03:18 AM   #17
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at rallyX's i'm bouncing off the rev limiter a lot! (as is many other people) car is fine so far @ 15k miles...

actually my redline is now 7500 rpms and I tap that quite a bit.

a lot of people abuse these cars and they are fine... except for those who like to crash or roll the car.
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Old 01-22-2004, 07:19 AM   #18
recursian
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The rev limiter is fuel cut. The reason why it cuts fuel instead of ignition is so that it won't dump raw fuel into the cats. That wouldn't make them very happy. The engine should not run lean when fuel cut happens. The computer has control of the injector openings on each and every revolution. If it decides to skip an injector pulse, there is no way for the cylinder to run lean because there will be no combustion.
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Old 01-22-2004, 08:38 AM   #19
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If you don't use it, you lose it!!
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Old 01-22-2004, 09:34 AM   #20
cjm04WRX
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Default Re: Redlining?

Quote:
Originally posted by JDMSubaru
Can any of the pros out there give us their opinion on the effects of redlining?

I would like to do this more often but then again I worry if I am doing damage by doing this consistently.

Does anyone here redline or hang out in the 6,000 + range area on a regular basis?
You have an 04. You should be safer than older MY WRXs due to the fact that you have shimless buckets. Shimless buckets mean no chance of spitting a shim. I used to rev my 04 to 7800 RPM on a regular basis at the drag strip in 1st and 2nd. You're fine. Don't worry about it.


Chris
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Old 01-22-2004, 11:13 AM   #21
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I bounce off the rev limiter on a almost daily basis at least once.
I ride the rev limiter (litterally bouncing on it) for 2-3 sec at a shot when autocrossing sometimes.
30k+ miles, stage 4 car and zero problems (so far...)
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Old 01-22-2004, 02:01 PM   #22
Equilibrium Tuning
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You guys can't possibly expect to ride your rev limiter all the time and for the engine to last 100k+ 30K with no problems is good and all, but I wouldn't call that proof.

-- Ed
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Old 01-23-2004, 06:37 PM   #23
JDMSubaru
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Default Re: Re: Redlining?

Quote:
Originally posted by cjm04WRX
You have an 04. You should be safer than older MY WRXs due to the fact that you have shimless buckets. Shimless buckets mean no chance of spitting a shim. I used to rev my 04 to 7800 RPM on a regular basis at the drag strip in 1st and 2nd. You're fine. Don't worry about it.


Chris
what do you mean? whatd they change to make this safer? what are the buckets and shims you speak of?

how do you redline at 7800??? i thought cut was at like 7200
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Old 01-23-2004, 06:56 PM   #24
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Default Re: Re: Redlining?

Quote:
Originally posted by cjm04WRX
You have an 04. You should be safer than older MY WRXs due to the fact that you have shimless buckets. Shimless buckets mean no chance of spitting a shim. I used to rev my 04 to 7800 RPM on a regular basis at the drag strip in 1st and 2nd. You're fine. Don't worry about it.


Chris
I have read this somewhere ...but i thought the shimming was was changed from the top...where i could be spit out to the base where it couldnt be spit out. I think they still use shims for adjusting the valve train to close tolerances? Anyone have this info somewhere cause it cant find the site that had this right up.

I found that there is a valve train that Cobb calls a shim under bucket to prevent the shim fron spitting... I dont now if it the same as the STI version on the 04's.

Last edited by WrxSlvrWgn; 01-23-2004 at 07:04 PM.
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Old 01-23-2004, 07:14 PM   #25
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No need to worry i have about 56,XXX miles on my car. i redline line it atleast 7 times a week still running strong and pulls like a mother f'er. just make sure you change your oil on time. plus mobil 1 always helps
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