Edmund's The Inside Line on the 627WHP N54

Jeff@TopGearSolutions · 02-29-2012, 02:59 PM

Quote:

Originally Posted by Das Stig

i bet they go WOT in 6th gear from 1000rpm trying to prove themselves right about it blowing up

Might be a good idiot test, though. A lot of tuners forget that their customers are much less knowledgeable than them and sometimes take common-sense things for granted. Either way, log everything during their test!

in the evo x world, hardly a week goes by when someone doesn't report blowing their engine because they didn't know lugging engines is bad. Tuners think "who in their right mind would be that stupid?". Answer: your average customer

Actually there is already vid of them loading in up in 6th gear at 1500 RPM. No problems. Not enough torque down there to cause a problem.

Fundahl · 02-29-2012, 03:07 PM

Holy crap talk about a bent rod!

Oh wait..... "That's what she said!"

AYF80 · 02-29-2012, 03:08 PM

So you can't role in 6th gear at 55-70 MPH and Smash the gas?

Jeff@TopGearSolutions · 02-29-2012, 03:18 PM

Quote:

Originally Posted by HPF 335i #1

So you can't role in 6th gear at 55-70 MPH and Smash the gas?

You can, its not recommended on any vehicle. Too much load and heat.

If you did that on say a Mazdaspeed 3 you can kiss your engine goodnight.

We are lucky to have such a stout bottom end from the factory.

Das Stig · 02-29-2012, 04:32 PM

it's not torque that causes the problem when lugging the engine. ie, in the evo (where that rod came from) you're only make about 150wtq at that point. It's more an issue of the engine being overworked (VE/load is sky-high) while gearing is putting lots force against the engine. Pistons are absorbing the force of a very big combustion explosion, trying to turn the crank, but the transmission isn't letting that happen. In a stock evo x, volumetric efficiency can get up to 400% at that point! The poor rods are stuck in the middle, and that picture is the result. Other cars might have a different weakest link, different load values when being lugged, and different rpm ranges to avoid, but pretty much all engines act like this.

I dont know if anyone's discovered the actual limits of the N54 internals yet... at least the pre-2010 forged ones. They seem pretty dang impressive! That's why i brought it up

02-29-2012, 03:07 PM	#68
Fundahl Captain 8 Rep 704 Posts Drives: VO 1M, 300zx TT Join Date: Mar 2011 Location: Corpus Christi, Texas iTrader: (0)	Holy crap talk about a bent rod! Oh wait..... "That's what she said!"
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02-29-2012, 03:08 PM	#69
AYF80 Major 83 Rep 1,142 Posts Drives: 2015 AY F80 Join Date: Sep 2009 Location: Nashville, TN iTrader: (0)	So you can't role in 6th gear at 55-70 MPH and Smash the gas?
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02-29-2012, 04:32 PM	#71
Das Stig Enlisted Member 1 Rep 31 Posts Drives: Evo X GSR + E90 335i Join Date: Feb 2012 Location: DC iTrader: (0)	it's not torque that causes the problem when lugging the engine. ie, in the evo (where that rod came from) you're only make about 150wtq at that point. It's more an issue of the engine being overworked (VE/load is sky-high) while gearing is putting lots force against the engine. Pistons are absorbing the force of a very big combustion explosion, trying to turn the crank, but the transmission isn't letting that happen. In a stock evo x, volumetric efficiency can get up to 400% at that point! The poor rods are stuck in the middle, and that picture is the result. Other cars might have a different weakest link, different load values when being lugged, and different rpm ranges to avoid, but pretty much all engines act like this. I dont know if anyone's discovered the actual limits of the N54 internals yet... at least the pre-2010 forged ones. They seem pretty dang impressive! That's why i brought it up
	Appreciate 0 Quote