Can Uprev Osiris change the shift points for the automatics and can you change the rev limiter?

 

Yes to both your questions.

Not so sure you wanna change the shift points though. My tuner stated they're pretty ok.

 

You can change the rev limiter with up rev but not the shift points. I think all you really can do is increase line pressure to make the 7at think you are making more power, but it really doesn't do much unless you are fi.

 

No, only anticipated torque, which raises pressure, thus shift firmness.

Yes, but why would you!!

 

You can adjust the rev limiter and torque vector mapping which affects shifts. but why would you want to change the actual shift point? your on auto so just throw it in DS and that already places you in a good gear for the speed and throttle position.

 

Thanks for the replies. Answers are pretty much all over the place as I expected. I'll try to call UpRev tomorrow and let you know what I find out.

As to why? How about "Why not?"

I've been reading this forum for over five years now and it still amazes me how the community differs from most all other car forums and gear heads. RPM is there for the taking. Some people will say that there is no power past XXXX RPM but they have no idea as to why they are saying that. They read that on a forum post somewhere or heard it from a tuner. Truth is, that XXXX RPM is different for every car that is modified differently than another. There is an RPM limit out there that is unsafe for the engine due to component limitations but that might or might not be in the same area that the factory set the rev limiter. And the factory setting are usually set pretty conservative. For example, my truck had a factory rev limit of 5600-5700 RPM. After my mods and with my tuning, I am now shifting at 6100 with the rev limiter set at 6250-6300 RPM. I'm not going to get into too much detail but that's the direction as to which I am looking into.

I think that with what I have done so far and with what I am planning to do with this car, a 500 bump in RPM in both shift points and rev limiter would be a nice addition and be still out of any danger zone. What about the guys that build bottom ends for this VQ? I know there is not many, but what are they running?

 

^^^ I completely agree.

It took some coercing, but I finally had Mikey lift the RPM limit on my G to 9000. It was set around 8000 and, although it appeared I was shifting early enough, I'd hit that 'fuel cut' at upper RPM'S and completely lose a run at the track. AAArrrggghhh.

Once we shoved it upward, and I took full responsibility for the revs, THAT'S when it started going fast. Jimmy watched my first pass in Dec, and immediately said "It's falling down when you shift. Hold it up higher." I was shifting at 7600. Next run: 11.13" et shifting at just over 8000.

We filled in some higher number so there would be no interference from the ECU. I'll take control now, thank you.

On the subject of the auto trans ECU, I've long wished there was more programming available. It's a mess of slow, soft shifts, and delays no matter when you hit the lever.

I have to anticipate the next shift, rather than hit it precise. Shouldn't it react at the speed of electricity?

Go for it.

Coop

 

Since I tuned my car I had problems with shifting . When I drive normally (50 ~ 70 mph) then I press full throttle the engine cut-off and gears are not engaging until I release the gas . I told my tuner about it last year but still I didn't get the chance to meet him because he is so busy. So I think changing the shifting point could do something with this.

 

I'm in the same boat Coop. I think I can push this little V6 a lot harder than what I am now and I'm fairly stock. The thing loves the revs and sounds pretty awesome once it's past 7000 RPM. I'm real surprised there is no tuning for the transmission. If I could get this thing to shift quick instead of flare and get it to shift a couple hunderd RPM higher in DS, I would be ecstatic.

So far this is what I think I know; UpRev will allow me to up the rev limiter but not adjust shift points. I think I can jack up the rev limiter, take the trans to DS and then manual and then control the shifts.?. I would then I have to "anticipate" when I want the car to shift. Great use of the word by the way, I've been using the same word for years when discribing the shifting of this thing in manual.

One other thought. I've test drove a number of 09 and up G37's with the 7sp auto and I hate hate hate it. You think the five speed flares, try a seven speed and you will be thankful.

 

yup, the flare in the 7at is pretty bad. I wish someone would find a tuning cure for this, they would make a ton of money tuning the 7at.

 

There is a cure for it -- it's called a 6mt jk

 

BTW, my engine would blow if I used the ECU to determine best shift points. Even with my higher RPM's, it's just too lazy.

I tried that once and it didn't work. Might be useful on a N/A motor, but not mine.

I have no experience with the 7AT. What is 'Flare' ?

Coop

 

Flare is that feeling you can feel between when the transmission starts to shift and when it is finally in the next gear.

 

If only infiniti put the gtr transmission in the new qs

 

Bumping this thread.

So, the rev limiter can be raised to fuel cut at around 7800RPM, for example?
My tuner said it can't be done because it was an automatic....