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-   -   RPM dont go over 4 on N (http://www.jeepforum.com/forum/f96/rpm-dont-go-over-4-n-1621345/)

DxBterrorist 09-25-2013 07:15 AM

RPM dont go over 4 on N
 
The other day I was with my friends and they started challenging each other on who's car is louder and I thought ill just join for the fun of it, so I put my car on neutral and hit the gas peddle but the RPM didn't go above 4.. Is that a technical problem or this is the standard thing on a 2013 Sahara unlimited?

ncb 09-25-2013 07:17 AM

Keeps people from doing foolish revving and blowing up the engine.

DxBterrorist 09-25-2013 07:20 AM

Quote:

Originally Posted by ncb
Keeps people from doing foolish revving and blowing up the engine.

So it's a standard thing on the new pentastar?

spyder6 09-25-2013 07:30 AM

It's probably more along the lines of the engine can't sufficiently cool itself at that load in a stationary position, so it doesn't allow it

tjkj2002 09-25-2013 07:36 AM

Quote:

Originally Posted by DxBterrorist (Post 16300833)
So it's a standard thing on the new pentastar?

Been a standard thing on many engines in the last 20 years.

Millermagic 09-25-2013 07:52 AM

Avoids neutral bombs as well. Transmissions do not like neutral bombs.

Vince1 09-25-2013 08:52 AM

LOL. At racing school they fine us $50 every time we high rev the engine (6K RPM limit for the Ferraris, pretty easy to do on the track). They say over time it helps pay for the added repairs. Why would anyone sit in N and see how high they can rev their engine? Rednecks, got a love em!

robplumm 09-25-2013 09:10 AM

Quote:

Originally Posted by Vince1 (Post 16302409)
LOL. At racing school they fine us $50 every time we high rev the engine (6K RPM limit for the Ferraris, pretty easy to do on the track). They say over time it helps pay for the added repairs. Why would anyone sit in N and see how high they can rev their engine? Rednecks, got a love em!

apparently they live in the desert, too :D

jwmbishop 09-26-2013 10:51 AM

No load over rev limit... almost all cars post 2007 have it to some extent. My Northstar will go to 7200 with a load - with partial load (like downhill) 6500 - with no load it will only hit 4100. Load is sensed by the readings from all flow sensors.

jwmbishop 09-26-2013 10:55 AM

Quote:

Originally Posted by Vince1 (Post 16302409)
LOL. At racing school they fine us $50 every time we high rev the engine (6K RPM limit for the Ferraris, pretty easy to do on the track). They say over time it helps pay for the added repairs. Why would anyone sit in N and see how high they can rev their engine? Rednecks, got a love em!

Which school?

Its not just paying for added repairs. Its much like expense for brakes tires etc - everytime you have all those moving parts "bouncing, floating and reverse loading" you have used time off your maint intervals for everything, like bearings, races, valve tip faces cam lobes etc... this is the same logic being used to apply to an engine designed specifically to use itself up at 590 miles for a 500 mile race. Engines make best power just before their wear has hit the limits (obvious loss of parasitic drags). On TF drag cars they have planned maint at every run, bearings, rings, seals etc, pistons at three runs etc...

Vince1 09-26-2013 03:03 PM

Quote:

Originally Posted by jwmbishop (Post 16333897)
Which school?

Racing adventures. It's in their contract. It actually helps motivate being smooth and efficient on the track. Hitting a cone in their Lambo is a $5K error so control is key.

rirrgang 09-26-2013 09:01 PM

It keeps dumb a$$es from over reving their engines in neutral. My motor home has a 8.1 ltr V8 in it. It will not rev above 3k rpm in neutral.

Monkeybomber 09-27-2013 08:29 AM

Yeah thats a rev limiter. My first car was an 04 PT Cruiser (yeah, coolest car ever!). Motor wouldn't go over 3.5K while stationary. I'd imagine its the same thing going on here.

Butterjeep 09-27-2013 09:55 PM

Be sure to redline your motor when it's not warmed up. That'll make up for the damage you've avoided by limiting the revs to 4k in neutral.

jwmbishop 09-29-2013 09:48 AM

Quote:

Originally Posted by Butterjeep (Post 16377697)
Be sure to redline your motor when it's not warmed up. That'll make up for the damage you've avoided by limiting the revs to 4k in neutral.

Hold throttle to floor, turn key to start and release key, count to 60 slowly, release foot from throttle.

Ain't that the correct way to cold start a vehicle?

Don't forget when you change your oil to run it for ten minutes after you drain the old stuff out and before you put the drain plug or new stuff in - just to make extra sure all the dirty stuff gets pumped out....

:cheers2:


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