Are there any advantages to raising the rev limiter on a 5AT? I ask because I want to know whether the car will still shift wherever the TCM is programmed to shift or can this be bypassed in Tip mode? I don't think anyone has created a solution to reprogramming the TCM on these cars which stinks. It would be nice to increase line pressure and all other aspects of the trans.

 

if you raise the limiter iit will help keep you from hitting fuel cut/rev limiter

 

Mine is raised to 7200 and I shift at 7k in tip mode when racing

 

Even with a raise rev limiter, the stock shift points are unchanged. But, if you are boosted, it gives you a bit of a buffer between the time the ECU starts pulling timing and fuel if on a stock VB and it can't complete the shift before you would hit the stock redline vs having it raised.

In manumatic mode, you can take full advantage of the higher redline.

 

But doesn't the EMS that you have with your FI setup take care of the whole fuel/timing buisness anyway?

 

yeah you can take advantage but I'm to scared to rev up to 7000 or even 7200 where my rev limiter is.

 

I think the utec can lower the rev limiter but not raise it if i'm not mistaken. could be wrong on that though. Most people do a reflash of the ecu to raise the rev limiter

 

You definitely can't raise the limiter with any aftermarket EMS except maybe a Motec or something crazy like that. You have to get the stock ECU flashed to do that.

 

UTEC can raise the rev limiter.

 

you have to use Manual mode otherwise it shifts at the stock points.

 

i don't think the utec can raise the rev limiter only set a lower one

 

That would make sense. The Fcon and Haltech can't so, I highly doubt that the Utec can. All the mentioned EMS's keep the factory computer in place.

So, if your in Manual Mode, you can shift at whatever you flash the redline at? Thats what i'm trying to determine. I really wish there was software to manipulate the tranny settings.

 

From the UTEC manual

 

Yes, on your question about redline...if your talking about being able to set your shift points, there is something out on the market to do this I just can't remember where I saw it. It was somewhere on this site, I think.

 

All of those EMS systems can raise or lower the rev limiter, depending on the year of the car. Fuel cut rev limiting can be overriden (pre-05), but the throttle closing is not managed by the EMS so a ECU reflash is required for that (for newer cars).

In other words, Nissan used a different form of rev limiting in the newer cars. Since none of the EMS systems today control the throttle, they do not have the capability to alter this.

 

I will say one thing since i put in the fp valvebody(bought from zulater)when i took alberto out for a spin,i left it in full auto mode and it shifted hard as crap, and bert said he saw 7500 rpm.Well that scared the **** outta me cause i wasnt watching the tach and he was so i shift manual mode all the time when i get on it.I did not have the rev limiter changed either.

 

I think Bert had a couple too many beers that night ......You would of definitely felt the fuel cut off at 7500 rpm based on your stock rev limit.

IIRC in auto mode I have also had it shift after the stock rev limit setting so I figured it was because my rev limiter was raised.

 

Are you saying that there are 2 forms of limiters on the 350/G or is there a fuel cut for the pre Rev-Ups and a throttle cut for the Rev-Ups? I talked to several tuners and both said that the only way to go around the limiter is to have a flash and mine is not a Rev-Up motor. I also have the Fcon Vpro. I would have thought for that kind of money you could do whatever you want and was very dissappointed to learn you couldn't.

 

There was one company that made a tunable program for the 5AT but, this was for Nissan's with non external TCM's. There was also another company that had something that was fully programable but, again i'm not sure whether it was for our specific cars. They never emailed me back and I didn't pursue it any further.

 

Pre 04.5 is a hard limiter. You bounce off of it, but the engine maintains power for the most part. 04.5+ is a soft limiter where it cuts fuel and pulls timing. So the engine slows down before hitting redline and doesn't bounce.