redline... - United Bimmer Community

**ivopivo** · 11-22-2005, 08:01 AM

guys, i wanted to do some 0-60 runs and was wondering how many times is it ok to redline the engine like that. i know there's no certain number but i just want to get an approximation. i know you shouldn't drive the car like that all day but would it be fine to do like 3-4 consecutive 0-60 runs. i basically wanted to see the diff. before and after cosmos intake and fan delete. thanks

DEATH2000 · 11-22-2005, 01:57 PM

Its never really ok to redline ur car. Any time u take it to redline or beyond it does damage to your engine, and after a while that damage can be critical and catastophic to the life of the engine. If u absolutley must do it, only do it once or twice. Ive accedntaily redlined my car before and i really dont recoment it.

**TerryY** · 11-22-2005, 02:43 PM

And I live there when I can and have for almost 50 years of driving.

My 840 has a "Redline" on the tach of 6500 but with the engine and transmission chips it does its shifts at 7000 in Sport.

The trick is to not Float the valves-IE not exceed the rpm where the valve springs can close the valves before the piston catches up and bends them. I would bet that that point is a lot higher than the redline on your tach.

Had a pushrod small block Chevy motor once that had an 11,000 rpm shift point (ran out of airflow thru two Big 4 barrel carburetors at 12,000). That is about 10 times the valve train inertia of an overhead cam engine.

Drive it like you Own it

**donald1476** · 11-22-2005, 02:55 PM

Quote:

Originally Posted by DEATH2000

Its never really ok to redline ur car. Any time u take it to redline or beyond it does damage to your engine, and after a while that damage can be critical and catastophic to the life of the engine. If u absolutley must do it, only do it once or twice. Ive accedntaily redlined my car before and i really dont recoment it.

It's fine to redline your car. Obviously it's going to cause more stress which if done frequently can lead to problems. Just think, there is a redline at that point for the reason being that any higher you lose power. Why do you think software and chips raise your redline?
So to answer your question, no it is not bad to redline.

nick_318is · 11-22-2005, 02:58 PM

Yea I redline mine all the time, after the chip it got raised to 7000rpm up from the 6500 at stock, i dont keep it up there but I will get it there from time to time.

**donald1476** · 11-22-2005, 03:06 PM

Quote:

Originally Posted by lecchilo

guys, i wanted to do some 0-60 runs and was wondering how many times is it ok to redline the engine like that. i know there's no certain number but i just want to get an approximation. i know you shouldn't drive the car like that all day but would it be fine to do like 3-4 consecutive 0-60 runs. i basically wanted to see the diff. before and after cosmos intake and fan delete. thanks

Make sure you post up the times. I'm interested in the difference, although I'm not ever doing the fan delete.

**ivopivo** · 11-22-2005, 03:18 PM

Yea I agree with that.

Death, by redline i meant to shift when it gets to redline, not run the engine at redline. what happened to you anyway ?

Quote:

Originally Posted by TerryY

And I live there when I can and have for almost 50 years of driving.

My 840 has a "Redline" on the tach of 6500 but with the engine and transmission chips it does its shifts at 7000 in Sport.

The trick is to not Float the valves-IE not exceed the rpm where the valve springs can close the valves before the piston catches up and bends them. I would bet that that point is a lot higher than the redline on your tach.

Had a pushrod small block Chevy motor once that had an 11,000 rpm shift point (ran out of airflow thru two Big 4 barrel carburetors at 12,000). That is about 10 times the valve train inertia of an overhead cam engine.

Drive it like you Own it

**ivopivo** · 11-22-2005, 03:19 PM

off topic... how are the pulleys working for you ? was it an easy install ? any power increase ? acceleration ? please tell me everything you can, if you want pm me, cuz i'm thinking of getting those pulleys soon and would like to know if it's worth it and how everything feels. thanks

Quote:

Originally Posted by DEATH2000

Its never really ok to redline ur car. Any time u take it to redline or beyond it does damage to your engine, and after a while that damage can be critical and catastophic to the life of the engine. If u absolutley must do it, only do it once or twice. Ive accedntaily redlined my car before and i really dont recoment it.

DEATH2000 · 11-22-2005, 04:41 PM

Quote:

Originally Posted by lecchilo

off topic... how are the pulleys working for you ? was it an easy install ? any power increase ? acceleration ? please tell me everything you can, if you want pm me, cuz i'm thinking of getting those pulleys soon and would like to know if it's worth it and how everything feels. thanks

They are so worth the money.Takes about just over an hour to install. You really notice a power increase. They give u so much torque over stock that u can really feel a diff. Great mod in my opinon, with some software would be absolutley sick.

DEATH2000 · 11-22-2005, 04:44 PM

Quote:

Originally Posted by lecchilo

Yea I agree with that.

Death, by redline i meant to shift when it gets to redline, not run the engine at redline. what happened to you anyway ?

I forgot i was in second gear, and i floored and i was going past 100kmh and it made this really wierd sound and this horrible lurch and i look down and im like "WTF?", i look down at the shifter and im like "oh.....damm". It scared the shit outa me for a second, but im sure it didnt do any real damage. The auto tranny automaticly cuts fuel if it senses the car going past redline to prevent it from damage.

Storamin · 11-22-2005, 05:49 PM

Quote:

Originally Posted by DEATH2000

I forgot i was in second gear, and i floored and i was going past 100kmh and it made this really wierd sound and this horrible lurch and i look down and im like "WTF?", i look down at the shifter and im like "oh.....damm". It scared the shit outa me for a second, but im sure it didnt do any real damage. The auto tranny automaticly cuts fuel if it senses the car going past redline to prevent it from damage.

lol... auto.

there is nothing wrong with redlining your car. there is nothing wrong with bouncing off the rev limiter. the car will cut the fuel when it reaches redline reguardless of transmission during acceleration. the problem comes when you're in a high gear, and downshift into a low gear and the revs go up and beyond the rev limiter. this is when things go wrong in the engine. this is assuming you have the stock limiter.

**donald1476** · 11-22-2005, 06:37 PM

Quote:

Originally Posted by DEATH2000

automaticly cuts fuel if it senses the car going past redline to prevent it from damage.

Quote:

Originally Posted by DEATH2000

Any time u take it to redline or beyond it does damage

.

**xsperf** · 11-22-2005, 08:15 PM

lol donald

ok, just make sure before your redline your engine, that your engine is warm, because sometimes if its still cold the oil didnt have a chance to get all around the engine. basically, the only danger of redlining(under the valve limit, as Terry said) is that IF a bearing or a seal or something goes, it will screw up your engine, and you are only risking that b/c the engine is spinning much faster..

and donald, change ur sig that is soo annoying!

DEATH2000 · 11-22-2005, 09:18 PM

Donald, lemme rephrase the second quote if i may. I meant to say any tim u take it past redline when not in gear or down shifting it does damage. Better?

**Numark318i** · 11-22-2005, 09:57 PM

my syncro on my manual tranny wont let me downshift at a redline speed..ie downshifting to 2nd gear @65. maybe my trannys just old..idk

as for redlining..i redline 3-4 times a day if not more..car runs fine. spiffs old E30 had 200000 miles on it...and he still redlined it daily.