Is it bad to redline?

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mesaboogie18
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Is it bad to redline?

Postby mesaboogie18 » Wed Dec 06, 2006 5:51 pm

Well is it? Now that I have complete control over when my tranny shifts I sometimes get the urge to rev it up pretty high b/c my old car was an automatic coupled to a 3.1L OHV V6 that wasn't rev happy at all. My new car however has no problem revving up to it's 6500RPM redline. I've never taken it all the way to 6500 but I have on some occasions taken it to 6000RPMs in 1st and 2nd gear. Is it bad to rev your engine that high? I normally shift at 4000RPMs in 1st b/c of the lack of torque and between 2500-3000RPMs for 2nd-5th gear. My car has a 2.0L DOHC I-4 with Variable Valve Timing and makes most of it's power at the high end of the tach. B/c of this I usually have to rev it up pretty good to go anywhere with some scoot. I know that it's bad to redline your engine all the time cause my buddy did that with his eclipse and threw a bearing in it. But what about every once in a while?
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Postby Prodigal Son » Wed Dec 06, 2006 6:01 pm

There is a reason the line is red.

Like people, machines have their limits.

Like people, machines can be pushed to their limits and survive.

Like people, machines that are pushed to their limits on a regular basis tend to have shorter life spans.

Unlike people, machines cannot heal small injuries. They just accumulate until the point of failure.
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Postby jomotopia » Wed Dec 06, 2006 6:06 pm

^^what he said.

i redline 2nd and 3rd whenever i get a stretch with no traffic in front of me, about once or twice per drive. i'm not worried. as long as the engine is properly maintained it shouldn't be a problem.
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Postby subzero » Wed Dec 06, 2006 6:08 pm

i hit redline in 2nd everyday. this is only like 2 times a day though
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Postby jomotopia » Wed Dec 06, 2006 6:13 pm

just to give you a real world example: i had a 99 AT corolla. i bought it with about 20k miles on it. it didn't have much power at all so i floored it almost every time i touched the gas. when it was floored, it would run up to redline (or almost) before shifting. i put over 100k additional miles on it driving this way and the engine is still going strong. the auto tranny is more likely to be hurt from that than the engine (but it's still going well too), which of course isn't an issue with an MT.
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Postby dklkse » Wed Dec 06, 2006 6:41 pm

I never run my car up to redline. It starts to lay over way before that.
I consider running to redline, essentially moving out of the power band... unless of course you drive a car that thrives on high RPMs (ie Civic Si; Corolla XRS).
But that's just my take.

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Postby subzero » Wed Dec 06, 2006 9:34 pm

sometimes if im feeling a little spicy to get to the next light i just stay in the powerband so i dont fall into the "dead-zone" upon shifting. 8)
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Postby eaglecatcher » Wed Dec 06, 2006 9:46 pm

I like revving my not so quick mustang to like 4.5k before shifting out of 2nd. Its quite a rush. haha
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Postby JackBauer » Wed Dec 06, 2006 10:24 pm

Hey eagle, is that the 94/95 5 liter i see on our avatar?

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Postby eaglecatcher » Wed Dec 06, 2006 11:02 pm

nope, that is indeed my very own 98 3.8L
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Postby vios » Thu Dec 07, 2006 8:47 am

Running at sustained high revs will increase the wear and tear of the engine. Occasionally touching the redline will probably not cause significant wear and tear. And old timers will probably advise you that occasionally running the engine at high revs may be beneficial, as it can remove unburnt carbon deposits (the "Italian tune up").

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Postby Tinton » Mon Dec 11, 2006 4:55 pm

Doesn't it put more wear on the rings on the pistons to rev it up high a lot? And wouldn't that just cause it to burn more oil and maybe lose some compression?

While on the subject of redlines, when is it not as harmful to go beyond redline? My Dad says that its fine to not go too far above redline if you're not under power (ie, you downshift and the car revs above redline for a couple seconds or so).
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Postby VTECaddict » Mon Dec 11, 2006 6:30 pm

Tinton wrote:Doesn't it put more wear on the rings on the pistons to rev it up high a lot? And wouldn't that just cause it to burn more oil and maybe lose some compression?

While on the subject of redlines, when is it not as harmful to go beyond redline? My Dad says that its fine to not go too far above redline if you're not under power (ie, you downshift and the car revs above redline for a couple seconds or so).

depends on how far past redline. the actual redline is like the car telling "OK, ease off now, i'm almost at my limit". then theres the rev-limiter usually a few hundred RPM above redline which is like the car saying "OK, f*cker, i'm gonna explode if you rev me any higher so i'm cutting your fuel off!"

that's when youre under power. if you're not under power (like when you downshift too far), the computer has no way to stop the engine from spinning past the rev limiter, so you can potentially grenade your engine if you go past the rev limiter when downshifting. so basically its safer to go past redline under power because you will just hit the rev limiter and the computer wont let it rev any higher.
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Postby Red_tsx » Tue Dec 12, 2006 4:23 pm

Like said before it is ok to redline but you shouldn't do it constently ina new car because you need to do the engine break in so later you can have a stronger engine.

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Postby eaglecatcher » Wed Dec 20, 2006 3:40 pm

Tinton wrote:Doesn't it put more wear on the rings on the pistons to rev it up high a lot? And wouldn't that just cause it to burn more oil and maybe lose some compression?

While on the subject of redlines, when is it not as harmful to go beyond redline? My Dad says that its fine to not go too far above redline if you're not under power (ie, you downshift and the car revs above redline for a couple seconds or so).


I think its actually more harmful to downshift and make it go above redline, than it is to bang it off the rev limiter, thats because the rev limiter can cut you off before you kill it, if you over rev, theres nothing keeping the wheels from turning the engine so fast that you throw a rod or something. I haven't taken my up to the rev limiter, but I've gotten about 300rpm away from redline a couple times.
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