5th and 6th Gens.....beware!

.........

 

good luck, and enjoy

out of curiosity, we have the redline because the engine shouldnt rev that high cause it could cause damage to the engine, with a raised rev limiter when shifting at that extra bit higher rpm arent you cause a little bit more damage to the egine?

 

Have fun.

 

True.. thats always been a question i've had... Why do people wanna raise their rev-limit?? it's there for a reason... isn't it??
These VQ's aren't like my old 13B that can rev to no end

 

I know that msot get them with a Mevi because the Mevi is still making power at the stock rev limiter but your still in the red. ofcourse if you had internals upgraded thats a different story.

 

After seeing what some guys have gone through with extended limiters, I (and Technosquare) felt that 7000 would be the safest. Yeah, it's still high but I won't hit 7000 while on my daily commutes but I will take advantage of it at the track.

I wish I had it this weekend when I ran a 2k3. I was door to door with it until I dropped into 4th. Without the upgraded ECU, I just hit a wall while sitting in the 4000rpm range. Either way, this car is going to be deadly with the ECU.

 

7000 is perfect and the stock internals, whether 3.0 or 3.5 can take it. People have gone considerably higher without upgraded valvetrains.

 

7K is fine, I would even push 7.5K without too much worry. I personally saw 7.2K a at least once a day for well over a year. Nissan, just like any other car manufacturer errors on the side of safety when it comes to these things.

With that said, it would not have made sense for Nissan to have any higher redline on a 4th gen max than 6.5K since there is not much power to speak of after 6K rpm's on a stock manifold. Our manifold was designed for superior mid range power. It is what makes our cars "feel" fast around town. Now if someone swaps in a different intake manifold like the MEVI or 00VI then things change. One would now be making enough power at the higher rpm's to justify an extended redline.

What you have to look at is the amount of power a car is making under the curve. There is only a certain amount of the rpm range your car will see in each gear. For example, if you take 2nd gear to redline then shift into 3rd you only have about 2k rpms to accelerate until you have to shift again. The goal is to find the point in a car's power curve where that 2K rpm's covers the greatest amount of power. For a 4th gen Maxima with an MEVI the greatest amount of total power under the curve is from 5K-7K. With a stock manifold maxima it is about 4.2K-6.2K, give or take a little depending on what gear your in.

 

deezo, if you don't mind me asking, what mods do you have done? If you don't want this info to be in this thread, could you pm me? I've always been curious...if not that's cool too, good luck with the ecu

 

That's interesting. But in that case why didn't they raise the redline on 2000-2001s?

 

I might be needing to send mine back to them soon.

 

No problem.

My mod list:
VI controlled by GM solenoid and Summit RPM Switch
Can Am upgraded alternator (220amp)
Budjet Y
KYB AGX (front)
Tokico Illuminas (rear)
H&R Springs
Stillen Cross-drilled rotors (on all corners)
Motivational rear mounts
Catz Hi/Lo HID Kit (4500K)
PIAA 1500XT Driving lights

.....and some stereo stuff.

 

Would you mind linking to that alt?

I saw a thread awhile ago in which krismax said an upgraded alt could produce more HP (at least in theory). Any truth to this or is it basically just for the stereo upgrade?

Either way, has it achieved what you needed it for...does the stereo dim the lights?

So TS has cracked the rev limiter? I keep seeing things that say they haven't actually done it escept on chestons car.

Have fun!!!

 

That is a good question. My guess would be that when all thing were weighed that erroring on the side of safety of the motor and valves was more important than a little bit faster 1/4 mile time. In additon, extending the redline does not give any more peak power, which is what they love to advertise and most consumers pay attention to, it just gives greater power under the curve.

 

Thanks for the detailed explanation, that give me a much better understandings all together. So a raised rev limiter with no MEVI, wouldnt yeild any gain regardless of what remapping was done? or its would be quite minimal?

 

What do you mean remapping?

Being able to rev beyond 6.5K is useless on a 4th gen stock manifold. Now if aftermarket cams are entered into the picture that might change but I don't think so.

 

AFR adjustments in the higher partof the band but like you said with stock manifold its pretty pointless.

good info

 

Well, AF adjustments and timing advance don't really have anything to do with the topic of extending the redline. Timing advance and leaning out the AF ratio will give more power but it will not change the shape of the curve. An MEVI totally changes the shape of the power curve. The power loss up top is because of the stock manifold design, not the timing or AF ratio.

In other words, re-maping the ECU can shift the power curve upward on a dyno chart but it will still have the same shape.

 

I'm calling

who's with me???

 

7000 is fine seeing as krismax i think it was maybe not who shifts at 8k at the track and other people have theirs at 7200 and shift at it on a normal basis.

 

i just talked with technosquare and looks like ppl with auto ecu will have 2 wait until summer time before they will have the raised rev-limiter.not sure about the 5M.

 

???????

The limiter has been crack for over 3 months now. My ECU is for a 96 auto also.

 

i got an ecu from TS recently without the rev limiter raised. I have a 95 auto ecu though. Last time i talked to brain, he said he will be working on it.

 

are you sure you will have the upgraded rev limit? I have been going to TS for months now, giving them my car and ecu...and they can't seem to figure it out...I even provided them with an ecu from JWT and they still couldn't figure it out...they told me the coding on theirs was encrypted or something...good luck with that extended rev limiter...as none of us so far have had it successfully done as I know of...and I know of several guys on here so far that have sent it in and paid for the extended rev limiter and got it back with the stock one...

 

I am not sure what your refering to but sure

 

I am with you, as I was one of those people who has been told for a few months that they have it figured out...then spent the next few months trying to figure it out with them at their shop..as I live nearby...then I managed to find a JWT ecu they could compare the coding from with no success...I personally just think it's a low priority in their eyes as they already have an ECU upgrade for our cars...and they don't see the real market advantage of selling basically a JWT ecu upgrade (higher rev limiter) at a lower price...everytime I go to their shop, it seems the Z and G guys take priority which is understandable as most of their business comes from them...

 

You ruined it. It was more of a joke than anything. I have never known dana to lie or mislead anyone. He is quick to bust a BS artist, so, I was calling BS on him

 

^

Sweet new mod Dana

 

Yeah, last I heard they hadnt fully cracked the code on ALL auto's.
Last I heard they stated their was just too many different models of ecu's.
As far as the 5 speed ecu, they last told me they havent really had time to work on it, and they didnt have a car to test with.

 

Would transmission reliability be an issue relatling to the redline? I'm not an engine/tranny expert, but I was reading an article about the mazda rx-8 that was saying that mazda was having difficulty designing an auto tranny to handle high 9k rpm redline.

 

No concerns or issues that I know of, but I am in no way an expert. Just have a lot of expierence with the MEVI

 

I am lieing, or am I?

 

Is it live or memorex?

 

so, got a link to that upgraded 220 amp alternator?

 

I think he's ignoring me...

 

Sorry Terran, I've been skimming this thread until now. There's really no theory behind making more HP with an upgraded alternator. When all engine electrical components are running at peak voltage along with peak current, you get more HP. It's proven but people want to stay in the mindframe that you only get HP from adding a pipe or an intake. With this alternator, I'm running all of my electricals at peak with more in reserve for stereo and lighting. Plus I'm running a smaller pulley which also frees up some resistance to the crankshaft.

Unc:

http://forums.maxima.org/showthread....ght=alternator

When I posted this, I was told it was a 200amp alternator but found out it was rated higher.

 

thanks for the link. I might see about getting one in the near future.

EDIT: also how much did it set you back if you don't mind me asking?

 

...well maybe not the near future.

Also, what did you have to ask for when they talked to them? Just a 220amp alt for a maxima or did they need info about the stocker?

 

Did u get the raised rev-limter?

 

how is it technosquare can program ECU's for 98's? but not 99's? they said the ecus were identical