hey guys im wondering if their is any way i can remove or raise my rev limiter. I would like to get at least 7500 rpms.

 

what mods do you have on the car is it a built motor, boosted more info

 

JWT ECU...either that...EU

 

Basically.

OP: Are you modified at all?

Looking at your posts, I see no indication that you've done anything other than purely cosmetic mods.

Are you aware that at you'll have virtually no power at 7500 RPM? Why exactly do you want to up your rev limit?

This isn't even an AM topic, IMO.

 

Correct.

 

and a constant 7500 rpms wouldn't be very safe either. IMO

 

Without a VI he wont build anymore power past 6000

 

yeah it isnt worth your time unless your vi'd. and personally i wouldnt go past 7000k with out some kind of internal upgrades oil pump ect ect.

also he would be lucky to produce power after 5500 since the usim falls on it face around there.

A Emanage ultimate or jwt or any kind of ecu upgrade will run you atleast 400 dollars. and if you go EU it takes some kind of work to get it going.


So unless you have some cash to blow on a VI and a ecu i would concentrate on other mods. but if you are VI'd it would be well worth your time and i would highly suggest raising that limiter

 

The VQ30DE is a low-midrange power engine. It doesn't make too much power past its HP peak of 5600 rpms. Like the others have said, a VI makes it more of a midrange-high end power engine so perhaps then a higher rev limit would be beneficial.

 

damn im so in over my head,"vi" what???? Any ways i just have the basic intake and a 2 1/4" exhaust from the cat back and an ebay muffler 2.5 intel,oval tip . I mean the car runs but i just thought if the rev limit was higher i could get more power. I really just want more power basically.

 

Yes, yes you are.

You really need to do a lot more research (by a lot more, I mean doing any).

Just because you have a higher rev limiter does NOT mean that you make more power. That just plain doesn't make any sense, especially not for a stock USDM VQ30.

Search 00VI and MEVI.

 

The stock intake on your engine has single runners and past a certain rpm the engine can't make more power so if you want to rev higher you need to replace your manifold with a variable intake runner manifold. You have two options. You can either buy a MEVI manifold which stands for middle eastern variable intake or a 00VI which is a variable intake manifold that comes off a newer maxima. I've seen a complete setup of each going for a good deal here on the forum in the 4th gen classifieds. Also buy a ECU upgrade. I've seen one in the 4th gen classifieds for a good deal also. If you are looking for more power these two upgrades will be really nice short of supercharging or going with nitrous. Exhaust upgrades will also help.

 

QFT
3-5k rpm FTW?

 

IMO dont raise your rev limiter, its gonna just cause headache. i just went through a motor for reving to redline too long with people in the car and my rod bearings went out. like others have mentioned, after a certain RPM, the DE motor makes no power. so if i were you, i would look into Supercharging it, you can get a kit on here now for $1500-2000, or get a 00VI. i went to the junk yard the other day and saw a VI in tact, or you can buy it on here for $350-400. with about 7-9psi, you can easily get about 260-280whp with other little mods. now thats power you will notice

 

You could also search for 02VI. Impressive gains.

 

What was your Rev limter set at and were you running a VI?
Ive hit 7k many times and never had any issues.
Granted I had the JWT so the car had fuel up to 7k.

 

i usually try to keep the revs pretty low cuz on my 95 max i used to rev it high all the time then i killed the tranny

 

i guess the stock setting, i never did anything to change it. but i had high miles (almost 200k), i had a couple people in the car, and i was at top speed for a bit. when we were done racing, i heard the knock.

 

Say what? I assume you are in essence suggesting a VQ35 swap?

And to the original poster, with the stock intake manifold and y-pipe power severely dies off after 5.5K RPM. In fact, our cars are the fastest by short shifting between 5600 and 6200 depending on the gear you are in because of this.

Revving to 7500 or above is not safe on this engine unless it is built. You definitely would need stiffer valve springs.

On a motor with stock internals I believe 7200RPM is the limit. And even then I normally wouldn't feel comfortable revving mine that high.


If you get a y-pipe and an 00vi swap, then by all means raise the rev limit, then the motor will be able to breath up top enough to make it worthwhile.



Quick question, if his maxima is an automatic, is it safe for the auto tranny to shift that high? And also how would he get it to? I am pretty sure the JWT ECU with the raised limit also changes shift points, does it? He would have to get a suprastick or some sort of standalone tranny computer right? Would the emanage ultimate be able to do it?

 

I hate to say, but the search feature on this forum absolutely sucks. I'm not trying to knock you Paul, I definitely agree there are a lot of people who really need to attempt to search, however it doesn't help much either that this forum's search feature absolutely sucks sometimes. I was trying to find a thread for someone about injector sizes and I know for a fact all of the following keywords were in the post:

ignition timing advance afc injectors vq35 dek

The search was giving me posts that were one-liners about headlight cleaning and leather seats.

Also when I was new myself, there are MASSIVE amounts of threads and posts that mention 00vi and MEVI, when I was trying to find that out for myself all I got in the search were hundreds of threads and posts like this one that basically said "search 00vi and mevi."


So at least one post in the flipping search results actually contains some info I'll add that the search is useless and whenever I need to look for 00vi info I normally search for the user Tatanko and click on the link to his maxima website in his signature. He made a real nice site on the 00vi swap. Here it is: http://tatanko.boredmder.com/

In a nutshell, the 00vi is the variable intake manifold from the 2000 and 2001 max. To do a full swap it requires a lot, such as an RPM switch, EGR block off, lower intake manifold, fuel rail, injectors, rear valve cover, rear coil packs, and something to tune for the larger injectors like an Apexi VAFC. This swap shows huge power gains in the upper RPM range and is basically why the 00 and 01 maximas make 227hp instead of the 95-99's 190hp.

The MEVI stands for middle eastern variable intake. It was for 95-99's but we didn't get these manifolds in the US and Canada. This is a much easier install but power gains are not as much and they are more difficult to find.

 

my point exactly, too much headache to rev that high when you not gonna make any power up there. even with my DE-k, and when i put the blower on i wont raise my limiter, its there for a reason unless you build the motor to handle it. when you start building a vq motor it gets real expensive real quik because our motors have double of most things. 4 cams instead of 2 thats like $1100 from JWT, 2 heads, etc.

 

I agree, many have said it is safe to rev our engines to 7200, but I feel like Nissan put the 6500RPM rev limit in for a reason. Hell, for the 2000 and 2001 max with the DE-K, they could have limited it at 7000 and would have been able to show the engine produces a lot more then 227hp, however they didn't. And I think it has to do somewhat with a safety zone for the engine's limits. I think that 7200 is a VERY fine line that when crossed you most likely will be floating the valves to some degree.

I have heard a rumor that the bottom end on our engines (rod bearings, stuff like that) is easily capable of handling 8000, and it is just the valvetrain that cannot be revved more than 7200. Anyone know if there is any truth to that?

 

i heard that before, but what does that mean really when you say floating the valves?, all i know is its something bad

 

It means everything is spinning so fast the valve springs aren't stiff enough to close the valves in time. Normally the valvesprings can keep tension between the valves and camshaft lobes. When you get float, its when after the cam lobe passes, the valve can't close as fast as it is supposed to. This is bad because of the following reasons:

1.) You loose power because your valves are partly open for part of the cycle they should be sealed

2.) Since it is not consistently following the cam the valve builds up momentum and whatever it is that interfaces between the cam lobe and the valve just SMASHES into the cam lobe on its next cycle.

Basically here is a way of thinking about it, lets say you have a really fragile glass bowl with a heavy metal ball inside. If you take the bowl and drop it smoothly at the rate of gravity and stop it, no harm is done because the metal ball is in contact with the bowl.

Now if you forcefully drop the bowl faster than gravity and stop it, that ball can only drop at the speed of gravity (aka the speed of your valvesprings), so since the ball didn't follow the bowl down, once the bowl is down and you go to bring it back up, the ball is lagging behind and still dropping and just slams into the bowl and shatters it. Thats basically what is going on in your valve train when you have valve float. I'm not saying your camshafts will just instantly shatter, but nevertheless it adds unaccounted for stresses and in general is not good at all.


3.) If it gets REALLY bad the piston can hit all the valves.

 

If it's giving you completely unrelated threads, have you changed the search options to sort by relevancy instead of date posted? Change that then save your search settings so you won't have to do it by hand anymore.

Also there's a sticky in the AM section regarding 00VI and (IIRC) MEVI swaps.

Depending on model year, there will be no EGR with the 00VI already. And it's 222bhp, it was only 227 for the AE

 

http://forums.maxima.org/all-motor/5...highlight=02vi

 

Impressive! I didn't know that had been or could easily be done! Just curious, why did you decide on the 02vi vs. the 00vi?

I assume the 02vi is designed to flow more air overall and it lacks the really long runners of the 00vi, how is the low end power with the 02vi?

 

The VQ can handle shifting to 7k if it has proper fuel, above that its iffy because of the stock oil pump and the stock valve springs. If your going with a SCer your going to want to go above 6500, trust me.
If not then go turbo and build your boost sooner or go with a much smaller pulley....

 

50 shot

nah
id go 00vi or 3.5 swap

 

I havent done this to my car so I cant really say how it is, but in that thread, the OP stated that low end power felt significantly higher. With a modified manifold (SSIMed), the top end gain should be quite siginficant also but we would need to see a dyno to confirm.

 

Ah, I didn't realize that option existed. Nevermind my comments on the search function, with relevancy I found every single thread I was looking for! Thanks.

Oh and yes, I forgot about that. The AE gets the extra 5hp from the variable muffler right?