Today getting on the highway I punched it and I noticed when I hit 7000 RPM it felt like the engine cut out...is this the rev limiter? Should it be at 7000? Am I revingn to high in 1st and 2nd if I hit 7000? Why does the tach go to 8000 then?

I'd search but search doesnt work right now.

 

Ok, first, yes thats the rev limiter or more acuratly, the fuel cut-off point, and it IS anoying.

BUT more importantly, I hope you didnt rev your other cars much past the redline. You realize that the Z's redline is 6500 RPMS, and thats not only the point of highest hp (6200 actually), but also the highest Nissan wants you to rev the car. Driving this thing up to 8000RPMs everyday would kill the engine alot quicker.

 

Thanks for the info...i thought something was broken.

I DONT drive like that all the time...first time really opening it up and i didnt pay attention to the revs...just stomped on it..and noticed it at 7000 on 2nd gear...gotta be more carefull.

 

But the cut off is at 6650!!

 

I would say that reving to 7000 rpm is fine. My Acura RSX use to redline at 7800 rpm, and fuel cut off kicked in at about 8000 rpm. I got my ECU reflashed and they moved the fuel cut off up to 9000 before it kicked in. So I would assume that the 350 has the capability to get at least another 700 rpm over what was set for redline at the factory, and everything would be fine. This is all my opinion, and i have not heard of anybody testing out the engine internals to see what the 350 can handle. Then there is to much crap to read to find out what is going on with the ECU reflash to find out if they are raising the rev limiter.

 

Im not sure how you could go to 7000 considering the stock fuel cutoff is at 6650 (as stated in a previous post)...anyways, I can go up to 7100, but i've got some secret mods

 

Oooooh! you can tell me, i wont tell anyone! I promise!

 

Matix, when will we know about your secrect mod? how much would it be if it's for sale?

 

I was only guesstimating 7000rpm..had to pay attention to the road..lol

 

Has anyone tested the reliablility of the engine going over the redline?

I know it can be calculated with the bore and the stroke, but I have no idea how. I just know that the newer Nissan, especially the VQ35DE and the QR25DE (not sure, the 2.5L SE-R engine) have a very low redline but makes good power and torque because Nissan design to cut cost and make a bunch of the same engine using very high quality material and put it on all kind of different car.

The result is a well build engine, but have reach its limit in term of comming from the factory. The 6650RPM redline is a mark I have not seen any tunner past, and that include Mine's who uses high comp forge piston, new camp, valve spring and so on, and still achieve max power at 6400RPM. If this were a honda engine done by Spoon, that redline would shoot up past 10K.

Therefore I think it is in the design of the engine block or parts that cannot be change that are the limit (weakest link) of the engine's redline. At least that was what I heard. Anyone have sucessful test the true reliable rev limit of the engine?

With a little ECU tunning, I think our engine can all hit 10K RPM, but for how long, and how many times. I sure want to do it more then 1 time for 1 second before the engine go B M

 

He can take it as high as he wants... but without our crawford plenum design OR FI... it's not making any power up there.

 

Talk about a shameless plug for your own product , but I think you're missing hte point about the higher redline, I mean i take it you have the crawford intake plenum, but can you take your car to 7100??

 

i know this thread is old but i found it looking for that japanese chip that increases the fuel cut to 7000 rpm ... anyway what im hearing now from tuners is that the engine can handle the higher rpms ... 7000 is fine even higher is fine for the engine ... but at 7200 the stock bearings will fail ... that is why they chose 7000 for the new redline ... thats still pretty close to 7200 so if your not careful you could quite easily spin a bearing ... but 7k would be nice

 

Would your secret mod be...your tach is off and the rev limiter is at 6,800rpm .Red line is at 6,500....rev limiter is at 6,800rpm. If your getting to 7,000rpm with out it kicking in your tack is off

 

http://www.technosquareinc.com/g35.htm

7100 RPM

 

The Stock Auto Transmisson 350z rev limit is set higher. Auto 350z has 7000rpm revlimit vs the manuals which is around 6600rpm.

It happens with all the Auto 350z here in AU, and I would think the US model is the same.

 

In AUTO mode, it kicks in at the same rpm as the 6MT Z...In Manumatic mode it kicks in at around 6800-6900.....The VQ can withstand a higher redline, easily.

 

so that means our VQ engine will have no problem with 7000 rpm at all since the auto and the manual engine are the same then?! Mmm..... that is a great one!

cheers,

richie

 

I'm not really all that confident that giving a higher redline would give anything... other than maybe a little more fun to drive...

As you can see from dyno curves, your HP drops off, and will continue to drop off... to really realize the gains of higher RPMs, I think you would need a decent amount of mods, in particular, different cams would be a sure reason to have a higher redline.

forgot one thing... I guess, some people could argue that it is better to shift later b/c then once you shift into the next gear, you will be higher in your power band... but then again, you stop producing as much HP as you go higher... so.....

 

Uhhhh.......here's something for You^ to consider...." ECU REFLASH".