Rev in Red zone

Supremo · 10-24-2009, 03:17 PM

Hi guys ! ( I am Hungarian so please forgive me my poor English)

So, accidentally a shifted back to 3 rd when I was running too fast and for a second - or maybe less - the rev went to the red zone. Is that dangerous if it stays at 8 000 rpm for second or a half ?
(Of course it a 370 Z..)

Matt · 10-24-2009, 03:22 PM

I can't imagine that a second or two in the 7500-9000 RPM range would permanently cause any harm. However, I'm not a mechanic, so my opinion is just that.

Island_370 · 10-24-2009, 03:23 PM

Is our engine an interference motor?

Supremo · 10-24-2009, 03:26 PM

Thank you for answering.

What is interference motor ? It is 370Z AT7.

kannibul · 10-24-2009, 04:49 PM

Quote:

Originally Posted by Supremo

Thank you for answering.

What is interference motor ? It is 370Z AT7.

As far as I know, the 7AT won't downshift to a gear that would put the engine above the redline - more than likely your RPM gauge needs adjustment or something.

Supremo · 10-24-2009, 04:57 PM

Hm.. Interesting... It seems for me now as I try to remember that the car adjusted itself indeed as suddenly the power dropped but I remember well that I have seen the pointer in red zone...

Supremo · 10-24-2009, 04:58 PM

...however the interval I have seen it there was very short. Maybe half a second or less.

cjof2003 · 10-24-2009, 05:24 PM

500rpms over the redline probably won't cause any issues.
I don't know how the 370z motor is, but if it went past 8k you could bend a valve, bend a rod or a number of other issues.

Island_370 · 10-24-2009, 10:35 PM

Quote:

Originally Posted by Supremo

Thank you for answering.

What is interference motor ? It is 370Z AT7.

An interference motor is when the pistons can hit the valves. Either from a broken timing belt/chain or if the motor is spun too fast and the valve springs cannot pull the valves back fast enough.

Some motors have either reliefs cut into the pistons or the combustion chamber is large enough to allow for clearance. It has nothing to do with tranny or options, but rather engine design.

If we have an interference motor and you spun it too fast, you can get minor valve/piston damage. But it sounds like you are going to be fine.

Supremo · 10-24-2009, 03:27 PM

Thanks Matt.

This is what I hope... I like too much her and I was blaming myself to be stupid and accidentally shift back...

ChrisSlicks · 10-24-2009, 03:52 PM

8000 is fine, in fact many have advanced their normal red-line to 8000 rpm. Even 9000 for a few seconds without any load isn't likely to any harm.

Matt · 10-24-2009, 03:54 PM

Quote:

Originally Posted by Supremo

Thanks Matt.

This is what I hope... I like too much her and I was blaming myself to be stupid and accidentally shift back...

Don't beat yourself up. Trust me, a lot of drivers out there are treating their Z a lot less cautious than you are. Sounds like she's in good hands.

Supremo · 10-24-2009, 04:09 PM

Thanks ChrisSlicks and Matt !

Yes, I keep an eye on her but telling you the truth sometimes I cannot resist to play with her at higher revs - but not 8 000 or similar...

So, It was very good to hear that I did not make a harmful action on her..

Matt · 10-24-2009, 04:14 PM

Quote:

Originally Posted by Supremo

Thanks ChrisSlicks and Matt !

Yes, I keep an eye on her but telling you the truth sometimes I cannot resist to play with her at higher revs - but not 8 000 or similar...

So, It was very good to hear that I did not make a harmful action on her..

I have a quite a bit of fun, and I'm still "scared" to go over 5k rpm. Once I hit a few hundred miles, I'll let loose a little more.

Supremo · 10-24-2009, 04:18 PM

So, you are even more careful than me ! I cannot resist unfortunately... BUt the 7500 rpm for me an important barrier not to be over, however I guessed that even 8000 is not harmful as Chris stated...

10-24-2009, 03:17 PM	#1 (permalink)
Supremo Base Member Join Date: Oct 2009 Location: Hungary Posts: 14 Drives: NIssan -2009 - 370Z Rep Power: 16	Rev in Red zone Hi guys ! ( I am Hungarian so please forgive me my poor English) So, accidentally a shifted back to 3 rd when I was running too fast and for a second - or maybe less - the rev went to the red zone. Is that dangerous if it stays at 8 000 rpm for second or a half ? (Of course it a 370 Z..)

10-24-2009, 03:23 PM	#3 (permalink)
Island_370 Base Member Join Date: Jun 2009 Location: Puerto Rico Posts: 228 Drives: 09 Nissan 370Z SR M6 Rep Power: 16	Is our engine an interference motor? __________________ Autobahn Country Club (North and South Tracks), Blackhawk Farms, Grattan, Gingerman, Mid-Ohio, Putnam Park, Road America, Sears Point, Thunderhill, VIR and "The Ring"

10-24-2009, 03:22 PM	#2 (permalink)
Matt A True Z Fanatic Join Date: Oct 2009 Location: Augusta, GA Age: 42 Posts: 1,680 Drives: 2010 Avalanche LT Rep Power: 19	I can't imagine that a second or two in the 7500-9000 RPM range would permanently cause any harm. However, I'm not a mechanic, so my opinion is just that.

10-24-2009, 03:26 PM	#4 (permalink)
Supremo Base Member Join Date: Oct 2009 Location: Hungary Posts: 14 Drives: NIssan -2009 - 370Z Rep Power: 16	Thank you for answering. What is interference motor ? It is 370Z AT7.

10-24-2009, 04:57 PM	#6 (permalink)
Supremo Base Member Join Date: Oct 2009 Location: Hungary Posts: 14 Drives: NIssan -2009 - 370Z Rep Power: 16	Hm.. Interesting... It seems for me now as I try to remember that the car adjusted itself indeed as suddenly the power dropped but I remember well that I have seen the pointer in red zone...

10-24-2009, 04:58 PM	#7 (permalink)
Supremo Base Member Join Date: Oct 2009 Location: Hungary Posts: 14 Drives: NIssan -2009 - 370Z Rep Power: 16	...however the interval I have seen it there was very short. Maybe half a second or less.

10-24-2009, 05:24 PM	#8 (permalink)
cjof2003 Base Member Join Date: Sep 2009 Location: Atlanta, GA Posts: 74 Drives: 02 Acura RSX Type S Rep Power: 16	500rpms over the redline probably won't cause any issues. I don't know how the 370z motor is, but if it went past 8k you could bend a valve, bend a rod or a number of other issues.

10-24-2009, 03:27 PM	#10 (permalink)
Supremo Base Member Join Date: Oct 2009 Location: Hungary Posts: 14 Drives: NIssan -2009 - 370Z Rep Power: 16	Thanks Matt. This is what I hope... I like too much her and I was blaming myself to be stupid and accidentally shift back...

10-24-2009, 03:52 PM	#11 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 654	8000 is fine, in fact many have advanced their normal red-line to 8000 rpm. Even 9000 for a few seconds without any load isn't likely to any harm.

10-24-2009, 04:09 PM	#13 (permalink)
Supremo Base Member Join Date: Oct 2009 Location: Hungary Posts: 14 Drives: NIssan -2009 - 370Z Rep Power: 16	Thanks ChrisSlicks and Matt ! Yes, I keep an eye on her but telling you the truth sometimes I cannot resist to play with her at higher revs - but not 8 000 or similar... So, It was very good to hear that I did not make a harmful action on her..

10-24-2009, 04:18 PM	#15 (permalink)
Supremo Base Member Join Date: Oct 2009 Location: Hungary Posts: 14 Drives: NIssan -2009 - 370Z Rep Power: 16	So, you are even more careful than me ! I cannot resist unfortunately... BUt the 7500 rpm for me an important barrier not to be over, however I guessed that even 8000 is not harmful as Chris stated...