Hi guys.
Im a relatively new 350z owner.
I have a 2005 Auto with quite a few highend goodies on it. It also rev limits at 7500 on the tacho.
I assume it's had that all it's life as it's an import from Japan and only had one other owner in my country, who didn't touch it mods wise.
I'm a little worried about the rev Limit being too high, but it doesn't feel like it's pushing to get up there.
I do know the engine has been opened at one point as it has a very thick gasket around the top of the motor, and aftermarket gasket sealer visible.
Does anyone have any insight as to whether I'll be alright with the limiter being so high? I know there's not a lot people will be able to tell, but maybe if you've had past experience it may help me ease my mind.

Cheers for any insights

 

Obviously you realize this is about 1500rpm past the maximum (stock VQ35) curve, there's really nothing more to be had out of the motor spinning faster. Best advise- watch your tach, and listen to the exhaust sound and learn to shift at 6100rpm. Hope your mind is eased. GL!

 

Yeah, I'm well aware of all that.
Obviously I don't run it at 7500RPM often, but there's no denying how addicting the noise is up there, and the pops on the way down
I assume since the car has 160kms and it's still running great that it's not really an issue, as the mods are all original.

 

From your statement, it doesn't sound as though you understand the rev limitations of the VQ35DE. The engine was designed to deliver its max output between 2500-6100 RPM. Revving it to 7500 does NOTHING for performance and actually stresses internal components leading to higher wear. If that sound is addicting to you, well, you bought the wrong car!

 

Open up the hood and see if you have 1 intake or 2. I seriously doubt someone swapped a cluster in for an HR cluster.
Either your year is wrong and you probably got a great deal because its an HR

Or someone modded the cluster and the mileage is probably wrong.

If it has 2 intakes its an HR and its fine to rev that high.
If it has 1 intake Id be worried about what I have.

 

It only has one intake so it's definitely a DE.
The cluster is accurate and has been confirmed through records as such.
I'm guessing the engine has had a fair bit of work done to it as it still powers through to 7.5k and runs super smooth up there.
Unfortunately as all the work was done in Japan there are no records of what that is.
Also people who have owned 350zs have said mine goes quite a bit harder than the standard ones.

 

Might have cams but I still would not push it that high. 7k once in a blue moon sure but not 7500.

 

How is an auto getting to 7500 rpm, put it in drive and just drive

 

Nothing better than the sound of damaging internals in the morning.

You mention the car came from Japan and has no service records. So how do you know the mods are "all original"?

If you are asking if it is okay to rev the car that high then you already know the answer.

Have a performance shop look at it and tell you what it has done and whether the engine can handle it.

 

I know the car came into the country with all the mods on it, as the previous owner made no extra modifications to the car.
The car came here with 80(Thousand)kms on it, and is now at 160kms. This means it has lived at least half of its mileage with those modifications and it still runs great.

I do plan on taking it to a performance shop - But as I live in a small town there is nothing local and I would have to travel several hours to get it looked at.
As I said I suspect the internals have been extensively modified, but all I wanted to know was if it's out of the ballpark to have this engine rev to 7.5k, NOT if a stock engine would do it safely.

 

That's a hard question for your average shop answer without a tear down. They can tell you if it's cammed, has aftermarket rods or fasteners but that's about it.
I wonder what runs it, I doubt it's uprev since it's from Japan. Maybe Mine's, Espirit or something like that.

 

Gotcha. I can't say for sure if that is "factory" normal for a JDM 350z, although not ruling it out, but it does go against what is the norm here in the US and most other locations. It may very well have been modified in Japan to be able to handle the increased rotations, but ultimately you will not know unless the engine is cracked open and examined. That trip will be worth the several hours to find out. If you honestly believe that the engine is not undertaking extensive stress to reach those higher rotations then I would not worry too much about it. Understand that until you have it examined and know for sure then you may be placing unnecessary stress on the internals and causing damage, especially if you have never had it dyno'd to see if it is actually making power past the typical power curve or if its "all noise".

 

Yes I understand that, thanks for your advice. I think I'll make a trip somewhere to get it looked at a higher priority.