Thanks. I presume you used the Redline 75W90 GL-5 oil? Any type of LSD additive?

I have 60K on the car and was considering replacing the parts in the Z-1 install kits but of course they wont tell me all the parts included in them so I'll probably have to buy it from them. They are too expensive on the gear set though so I'll purchase it elsewhere.

 

Don't mean to hijack the thread, but I wanted to know if any of the 5AT guys swapped their tranny oil with Redline?

 

A lot has been said about how the gear install would affect cruise control. I see that the ICC is only avail. with the Tech Package, or at least that is how the 2010 info. records. So can anyone declare that the gearing is a problem for standard cruise AND ICC or just ICC?

Also, a quick way to find out if this or that is different between models is to call the dealer and check to see if the part numbers are different/same. If they're the same great! If not, something is different and who knows until you lay them out or talk to someone that knows what the difference is.

 

I posted this before, I don't mind posting it again.


Again, that was straight from the ICC section, I need to look again for the cruise control section without the ICC. I'm also thinking that if someone radically changed their tire diameter it would cause the same problem (not positive of that though). I think it wouldn't be that hard to fix the programming (change the tables) for the cruise control logic, it's just a matter of anyone being able to do it.

If this didn't effect the cruise control on her car, this mod would have been on the top of the list.

 

More I found (still in the ICC section, can't find a cruise control section without Intelligent Cruise Control).



ICC sensor integrated unit judges gear positions according to the following signals.
• A/T turbine revolution signal transmitted from TCM with CAN communication.
• Gear ratio calculated from current gear position signal transmitted from TCM with CAN communication.
• Gear ratio calculated from vehicle speed signal transmitted from ABS actuator and electronic unit (control
unit) with CAN communication



DTC No.C1A15
Trouble diagnosis name DTC detecting condition Possible cause

GEAR POSITION
When a mismatch occurs between an A/T turbine
revolution signal transmitted from TCM
with CAN communication and a vehicle speed
signal transmitted from ABS actuator and electric
unit (control unit)

• A/T turbine revolution sensor
• TCM
• Wheel sensor
• ABS actuator and electric unit (control
unit)

 

looks for sure like it is going to affect the CC and you would have to change the codes. I don't think the dealer would agree to do that due to the liability issues. If you have a computer to make changes in your car's brain it would be a miracle cause most of them are crippled by the factory.
I was going to swap my VLSD [7sp auto 3.36] with the one from 370z [ 3.69] to add a little more kick to the pickup of my coupe but all of it makes it too complicated as the on board computer would detect the missmatch and throw an error code.
Is there anybody [maybe...] who's done it succesfully?
And I sorry if I'd missed anything from this 7 pager thread that could have mentioned it.

 

My dealer performs this mod all the time. Lokey FTW!

 

Which mod? The swapping gears part? What about calibrating the computer for automatics?

 

Who's the dealer?

Thanks

 

I'd like to this to my car but I drive too much on the highway. How big of a decrease did you notice in your MPG?

 

I honestly did not notice a decrease . I do floor it all the time now..

 

I can say coming from the Mustang world where this mod is very popular, it will make a huge difference. I am suprised its not more popular with other car makes. Best bang for your buck mod on a Mustang. Yeah it doesn't add horsepower but it will make a bigger difference then probably all other bolt-ons combined.

As for the top speed/acceleration. Yes your theoretical top speed will drop, but your actual top speed will most likely go up as your car will be able to overcome greater resistance. This is of course not factoring the governer

 

From what I've read, a stock G37 coupe 6MT will reach 155 MPH in 5th gear at redline (so you can say it is gear limited in 5th gear). It will also reach 155 MPH in 6th gear due to an electronic speed limter (so you can say the car's true top speed is electronically limited in 6th gear).

By putting lower gears (which are numerically higher) in the G37, it will no longer reach 155 MPH in 5th gear. At redline, the speed in 5th gear will be lower than 155 MPH. It will still be electronically limited to 155 MPH in 6th gear though, but at a different RPM than before. That's because the car wasn't gear limited in 6th gear originally and it won't be gear limited after swapping the differential gears.

Some cars can get even higher top speeds after installing more aggressive gears. That's especially true if you have a car with highway gears (something like 2.73) and the engine isn't able to pull anywhere near redline in top gear. If you swap in something more aggressive, the engine will be able to pull a much higher RPM in top gear and may even end up with a higher top speed, assuming it is under the limitations of the gearing and the car doesn't have an electronic limiter of any kind.

Anway, if you think about it, there are only 3 possible ways to limit the top speed of any car: 1- gear limited, 2-electonically limited, 3-drag (aerodynamically) limited. Since the G37 is electronically limited, this kind of modification should not negatively effect absolute top speed.

 

Correct, which is why I said not factoring in the governor (electronic limiter), which can be disabled

 

Will this work for the 7at?