Hell naw! I'm going to prove this wrong this friday as I'm going to the track to race an 05 6MT G thats EQUALLY modded to my 03 5AT

We both have intake, XO2 dual, and i have a crawford plenum and she has a 5/16th spacer.

That 6pd is definitely going down.

 

I drive these all day, and sell them, not to mention I daily drove one until today.

a 3 series TC locks much more agressively than a G's does.

G's will only lock up for cruising.

 

Okay, but you're wrong. Why don't you read the JATCO 5AT service manual and get back to me. Driving and selling them is meaningless here.

 

GTFO with your logic and experience My old 94 Z28 was an auto and obviously had the 4L60E. When that thing stifted at WOT, it would leave me brain in the back seat.

You bring up a good point too. Take the C6 Vette for example. The new 6AT is faster than the 6MT by a decent margin. With the right gearing, the right stall TC, good efficiency, and a strong motor torquey motor can make an automatic just as good a performer as it's manual counterpart. I think we're right at the cusp where it's starting not to matter, performance wise, which tranny is in the car. It's purely a preference.

 

All I know is that whenever I'm on the fwy, its locked.

~3k rpm = 80.

If i floor it, first it unlocks, rpm jumps up. Then it goes to 4th, then 3rd.

 

http://auto.howstuffworks.com/automa...ansmission.htm

The TC does absorb some of the shock, but that's not why there's no movement in the chassis on a shift. The end result is the same as the DSG (ie the next gear is always there almost instaneously), but the operation of the auto is a bit complex than that of the DSG.

 

If I go WOT at 80mph, the tranny drops to 3rd. It doesn't unlock the TC in 5th, then drop to 4th, then grab 3rd. If I'm in manual mode in 5th, I can tap the shift twice and it will grab 3rd and bypass 4th.

 

Do you have any modifications done to your tranny? Mine has NEVER acted like that.

In fact, I've never had mine actually SKIP a gear...

 

Werd! DaveB, do you know any good shifting tricks to do with this 5AT? Seems like you know your stuff and you pretty much made people STFU in this thread.

 

No modifications. Maybe I'll make a video.

 

Please... I'm actually interested in seeing this.

I've driven hundreds of G's... and I don't believe I've actually seen gears skipped... but flooring it isn't exactly something I do with a car that isn't mine either.

I'm not a mechanic, but to my knowledge, planetary gears can't actually SKIP gears... although they can shift very quickly... then again I may be wrong.


I'll have to do some experimenting at work tomorrow... I'm always interested in learning more.

 

I sort of know what hes talking about.. Lets say I'll be going 45 and I don't want to use my brakes a whole lot. So I start braking lightly while pulling the lever back a lot of times quickly.. The car will down shift very quickly.. Some times I think it skips 3rd and sometimes 2nd.. You see the numbers change very quickly but you only feel one strong downshift

 

From what I remember 5AT trannys in the 03 sedans are different than the coupe trannys. I've driven a handful of them when they first came out and if the tranny downshifts for you and does not go into 1st gear it will eventually upshift for you back into the previous top gear.

 

These are the only 5AT tricks I've been able to come up with:

1) When racing at the strip, let the car shift the 1-2 itself and then manually shift the 2-3 at an indicated 6400rpms and hold 3rd the entire run (only applies to RWD G35s).

2) Remove the center console and bend the shift prongs, that engage the shift dip switches, outwards so that there is less movement needed in the shifter to engage up/downshift. Mine is setup so that I can tap the shifter up less than a 1/4" either way to get the up/downshift. This mod also seems to greatly reduce the 5ATs tendency to ignore your downshift requests.

3) You can increase a 2 gear downshift response by mashing the gas and tapping the shifter down twice, at the same time.

4) When double downshifting for a turn (ie 4 to 2), downshift before you start turning the wheel and applying the brakes. I think the yaw sensor talks to the tranny and when it sees you braking and turning, it sometimes wants to ignore your request to execute the 4 to 2 downshift. It probably thinks you made a mistake and only meant to do a 4 to 3 shift. Bend the shifter prongs along with executing the shift request before turning/braking should improve your control greatly.

Everyone thinks the 5AT is so slow to react because they want the tranny to downshift the absolute second they request the gear change. Only newer autos have this capability and they're far and few between still. Yes, there is about a .7 second delay from when I request the downshift to when it's completed, but I'd you'd be hard-pressed to find a manual driver that can complete the same task (clutch in, move shifter, rev match, and release the clutch) in .7 seconds. Most of the manuals I've owned and driven need a little finesse with the gearbox when asking for a 4 to 2 downshift from 40-45mph. Even the fluid smooth 5MT in my old Accord LXi hatch would sometimes baulk when I'd do a downshift like this. IMO, the G/Z 6MT tranny is very resistant to quick downshifts, just like my old 5MT Maxima I drove for 6 years.

 

The coupe will not do a 1-2 gearshift unless you are in full auto mode and then switch to tiptronic after the first shift.