How important is it for a 4th gen w/ a DE-K swap motor or someone with a 00vi swap AND supporting mods (headers, intake, exh.) to rev beyond the factory rev limiter? I guess what Im really wondering is does the powerband exist there if you have the ability to rev there? If so, even with out tuning of at least fuel?

I mean my car w/ the de-k feels like it could keep pulling, but ***-dynos can lie without problem. I searched for some dyno sheets but only came up with a few that didnt really pertain or didnt show that far. I see the mevi vs. 00vi dyno sheet, but that is on a boosted car.

 

Going past our 4th gen rev-limit with 00VI will help a lot. It is up to the disgression of the cars owner. I am a believer that Nissan chose that RPM for 2 reasons:

1: The engine is not going to damage itself
2: The powerband is useless in its stock form

SO ... given that we have changed situation #2, it justifies a small increase in rev-limit. The most agressive MEVI/00VI users go to 7200. I personally wouldn't like to see my engine past 7K.

NOTE: This definitely does not apply to 3.5s unless they have those ARP rod bolts. I remember a thread that says that the amount of strain induced on the engine just an extra 1-3K over rev-limit is significantly higher than that of just below rev-limit.

 

but the extended rev limit doesnt give extra power does it? I understand that it lets you keep going up but thats it right? Does it change the entire pull all the way through rpms?

 

as far as im concerned, when you shift @7.2K the next gear is already in higher RPMs and at a more torquey place in the powerband than stock redline, so yea the whole thing is shifted

 

ok thanks for the info

 

Except for the 1-3k part, I'm sure you meant 100-300 RPM.

 

Yes for sure. That could be a couple tenths right there.

Id love to see a very consistent car/driver shift at stock rev limit vs 7000 or 7200 rpm and note the differnces. Im sure its going to make a difference but enough to warrant spending $600 for a ECU? Thats basicly the only way to get around the rev limit right? Other than maybe a VSS switch????

 

Oh, ok.... . . . .

 

???.........

 

exactly?.......lol

 

EU can get that rev limit higher.

 

This is quite an informative thread. (SORRY I NEED TO POST 14 more times, so expect at least 14 more dumb things to come from me before I say something that actually means something)

Thx- mgmnt

 

So then you will get

 

do you mean the ecu?

All i meant is as far as I know a jwt or other modded ecu is the only way to rasie the rev limit. (or is there other ways?)

A cheap way around it MAY be a vss switch, I dont even know if that would work on a maxima.(It works on GM's, No idea if it would work on a nissan) And the only thing that would do is disengage the vechicle speed sensor which would allow higher revs and no top speed limiter but would take out the speedometer while disengaged.

Personally Id rather get a ECU and probably will, Im just asking if it really is worth it.

 

Greddy EMU can do it also.

 

Ohhhhh, sorry, I didnt know thats what you meant

Basically extend the spark and fuel tables to fix it?

What cuts out on these for rev limit, fuel or spark?

 

Fuel . . . .

 

It's a fuel cut. The spark map goes up until 8200 RPM or something like that. You just basically add fuel at the right time (RPM) so the fuel cut is out of phase and the revs continue past the stock redline.

 

Hmmm, Im waiting on installing my NEO, would that do it If I tuned it that far up?

 

No, it will not. AFC will only alter MAF signal and voltage, richening, or leaning the AFR.

 

damn, yeah good point...worth an asking