Awakence

Might be a stupid question but wondering if its better to dyno and tune the G37x (AWD) by pulling the awd fuse and just enabling the rwd for the dyno or actually using a AWD dyno and getting AWHP numbers. Also any tips or advice to tell the tuner on the dyno to get better numbers?

RMB5190

iTrader: (2)

The AWD G37 is 100% RWD bias until slip is detected.

Epiphany

That's not correct. It's 25F/75R up to 12MPH then it's fully RWD until slip is detected. Ratio can also vary depending on slip.

RMB5190

iTrader: (2)

You have a source for that? Infiniti states otherwise:

Lt8Che

iTrader: (6)

Either find an AWD dyno, or detach the front driveshaft for a RWD dyno.

Epiphany

I honestly can't find where I read it, but I did find this saying the same thing? https://www.myg37.com/forums/g37-sed...tem-split.html

RMB5190

iTrader: (2)

I read that as well but none of it is supported and there's no evidence supporting any of those statements. Until I see that, I'm going with what the manufacturer states. Maybe when it's in 'snow' mode it makes that split? I don't know - again, I'd need to see some sort of evidence.

Epiphany

I found a review of a 2004 G35 that states all this, but Infiniti sure doesn't make info about the AWD system easy to find. https://www.motortrend.com/cars/infi...infiniti-g35x/

RMB5190

iTrader: (2)

https://en.wikipedia.org/wiki/ATTESA

The X uses the ATTESA E-TS (First one on the list), from that paragraph...

'Drive to the rear wheels is constant via a tailshaft and rear differential, but drive to the front wheels is more complex by utilizing a transfer case on the rear of the transmission'

I want to draw attention to the word 'constant'. Having those two sources I believe it's safe to say, the G37x is 100% RWD until slip is detected. There is no evidence out there, that I've seen, that contradicts that besides internet rumors and water cooler talk.

We have the same AWD set-up as the R32 and R33 so I guess we have that going for us...

Awakence

Never tested this but I have always thought that the power was split 60/40 (or 70/30 i forget) until a certain speed then it becomes rwd biased at 100% power. The Snow mode just prolongs that power split longer and restricts the throttle. The Altessa AWD system are different on the older skylines as its an older generations for the system.

RMB5190

iTrader: (2)

We have the ATTESA E-TS. It's a 100% RWD bias system until 5% slip is detected. There's absolutely no split in the G37x. Snow mode limits throttle until 12 MPH. Even then, the car is 100% RWD until that 5% is detected.

Epiphany

I don't think the word constant means it's 100% RWD until slip is detected, it just means that there's always power going to the rear. As it stands there doesn't seem to be anything saying much either way about it. Again this is from a 2004 G35X, but that was also the ATTESA E-TS system. https://www.roadandtrack.com/new-car...infiniti-g35x/ . Part way down:
This site says the same thing: https://www.theautochannel.com/news/...12/170493.html . So I don't know where, but this info has definitely come from somewhere.

zer099

iTrader: (2)

Is this a debate about if you can put a AWD G on a RWD dyno?

Do what he said. It sucks, but it's the truth. If you really want to roll the dice on how others thinks, reads, or believes the AWD system on our car works when you are about to strap your baby down and red-line it then I have some business propositions for you. I know when I flushed my tranny, all four wheels were turning. I know when I dynoed my car all four wheels were putting down power. I know I would never put an AWD car on a RWD dyno and risk any type of accident. But, those are all my opinions. You need to figure out what you would like to do then find a shop that will also comply. I doubt you will find a shop that will put your car on a RWD dyno without disconnecting the front shaft. Even if you electronically disable the ETS unit I do not know if I would roll those dice; again, my opinion.

I know Z1 here in GA will drop the front shaft to do a dyno.


Also, snow mode does more than throttle limit below 12mph (which it does do that, and pretty well). What's it do? No clue, but I can be doing 70 down the HWY and click that button and feel the torque split change for a second.