[Jlomb436]

Strange question I know, but I came from an Acura it revved out to 8000 rpm. Often, on the freeway onramp or just getting on, I'd hold it at maybe 4000 rpm's for maybe 20 seconds or so if I knew I had to punch it to get it on the freeway it was ready to go.

Now, the question is this. I have a 335i, and I honestly just feel guilting holding it above 3500 for a period of time, say when i get on the freeway. Fee's like I'm gonna float a valve or throw a rod or something.

How does everyone else feel? This is hard to explain, so I'm just hoping everyone has an idea of what I'm talking about.

[The HACK]

7,900.

[alex2364]

If you're cruising, there is no need to be above 2500 rpm.

[Outlaw 06]

Originally Posted by The HACK

7,900.

Haha. If the Op is referring to the N54 engine then my answer is 6,500 to 7,000 RPM.

Originally Posted by alex2364

If you're cruising, there is no need to be above 2500 rpm.

The N54 engine is barely producing 140 hp at 2,500 rpm.

[Jlomb436]

Originally Posted by alex2364

If you're cruising, there is no need to be above 2500 rpm.

I'm not referring to cruising. I'm referring to maybe an onramp. Your sitting behind a minivan, and your waiting to merge on the freeway. Sometimes I'll maybe hold it at 3000-3500 for 10-20 seconds? That way I don't have to downshift at just peg it.

Does that make sense? I wish I could explain it better.

And yes, N54.

[JayKay335i]

I'll cruise at 3k-3.5k. Never know when you're going to need to spin those wheels on the freeway.

[BTM]

Originally Posted by TJDiCandido

The N54 engine is barely producing 140 hp at 2,500 rpm.

He's referring to cruising speed, producing any more hp than is required to maintain whatever speed you're cruising at is a waste...

[Jlomb436]

I mean, was the N54 meant to be revved out? I know nothing of the internals of the engine, whether they have titanium rod bolts, forged pistons/rods, strong valvetrain.

I used to work on Honda motors and thats what we ended up doing to deter any sort of damage. But I haven't really researched the N54 and it's stress limits. If it was an M3, I probably wouldn't even have asked the question as it being an N/A engine and a 9000 rpm redline, I'm sure it could handle the stress.

[ak335]

4k

[BTM]

M3 does not have a 9000rpm redline...

Without intentionally abusing the car, these engines should be able to handle "spirited" street driving. There is a redline/fuel cutoff built in for a reason. Once my engine temp is above 200F, I have no hesitation burying the the throttle or maintaining rpm between 4500 and 6500/6700 through a few twisties.

[turb0mik3]

Frick all of you, unless I gun it, I am cruising in 6th at any speed above 40, LOL. So, 1500-2800.

[Karlb]

I never go above 5k rpms

[The J-Man]

Originally Posted by BTM

M3 does not have a 9000rpm redline...

Without intentionally abusing the car, these engines should be able to handle "spirited" street driving. There is a redline/fuel cutoff built in for a reason. Once my engine temp is above 200F, I have no hesitation burying the the throttle or maintaining rpm between 4500 and 6500/6700 through a few twisties.

I agree with this. There is a computer controlled redline for a reason. Anything below that is safe. What's the point of these high performance engines if we're afraid to go above 3K rpms?

[fisherbln]

There is absolutely nothing wrong with holding it in the higher (5-7K) RPM range for a sustained period of time. If the car had a better cooling system to prevent the oil from over heating, you could take it out on the track and maintain that RPM easily for a 30+ minute session.

You are not going to hurt this engine by driving it in a spirited manner once in a while.

[Jlomb436]

Originally Posted by The J-Man

I agree with this. There is a computer controlled redline for a reason. Anything below that is safe. What's the point of these high performance engines if we're afraid to go above 3K rpms?

I think we're all a little confused on what we're talking about. I'm all for gunning it past 3000 rpm's, but what I'm getting at it holding it at a certain rpm without a load. I don't think ANYONE here would let it sit at 7000 rpm's with no load for 20 seconds. I think you can fry your rings pretty easily that way.

[rickwjenn]

Originally Posted by Jlomb436

I think we're all a little confused on what we're talking about. I'm all for gunning it past 3000 rpm's, but what I'm getting at it holding it at a certain rpm without a load. I don't think ANYONE here would let it sit at 7000 rpm's with no load for 20 seconds. I think you can fry your rings pretty easily that way.

I don't think that was the suggestion - holding it 7k rpm at constant speed is fine for 20 seconds. The engine is loaded and all systems are supporting the rpm granted temps are going to rise. I also think most of of would shift a gear after about 5 seconds of this

[Jlomb436]

Originally Posted by rickwjenn

I don't think that was the suggestion - holding it 7k rpm at constant speed is fine for 20 seconds. The engine is loaded and all systems are supporting the rpm granted temps are going to rise. I also think most of of would shift a gear after about 5 seconds of this

I agree. I get nervous at 5000 if I don't peg it. Maybe there is an engineer or motorhead in here, but revving an engine at high rpm without a load increases the chanfes or throwing a rod right? Maybe float a valve too?

[SteveC]

Originally Posted by Jlomb436

Strange question I know, but I came from an Acura it revved out to 8000 rpm. Often, on the freeway onramp or just getting on, I'd hold it at maybe 4000 rpm's for maybe 20 seconds or so if I knew I had to punch it to get it on the freeway it was ready to go.

Now, the question is this. I have a 335i, and I honestly just feel guilting holding it above 3500 for a period of time, say when i get on the freeway. Fee's like I'm gonna float a valve or throw a rod or something.

How does everyone else feel? This is hard to explain, so I'm just hoping everyone has an idea of what I'm talking about.

The engine should be able to take any revs below redline without damage....but what would be the point of holding revs at 7000 to overrtake if you have to change gear at 7,500?

The real question here is what revs to hold the engine at to give maximum acceleration and shortest overtaking distance. The answer is therefoire to hold the engine at the lowest revs that still provides maximum torque and sufficient hp to execute the overtaking manoeuver without the need for an upshift. Probably 3-3,500 would meet those criteria as 3,500 will provide massive accelration but still allow 3,500 more revs before an upshift is necessary

[fisherbln]

Honestly though, I can't imagine many mini-vans I would have trouble over taking at any RPM in a 335i.

[bsamoul]

Anything above 0

[gun6slinger9]

I dont understand... you have a 335 why do you need to hold the rpm's up when you have all that torque on tap??

[3Coupe4Me]

Originally Posted by SteveC

The real question here is what revs to hold the engine at to give maximum acceleration and shortest overtaking distance. The answer is therefoire to hold the engine at the lowest revs that still provides maximum torque and sufficient hp to execute the overtaking manoeuver without the need for an upshift. Probably 3-3,500 would meet those criteria as 3,500 will provide massive accelration but still allow 3,500 more revs before an upshift is necessary

+1