What mod would help my car either pull all the way through the power band or shift at a better point? When I leave my car in the auto mode it runs hard all the way up to about 6k rpm and then I don't really gain any speed until it shifts to the next gear. It seems to "hang" for a few seconds then starts to pull again after it shifts. If I use the manual mode I can make it shift a little earlier and it helps but I was wondering if there is something that would fix this. Just for the record I'm not looking for turbo or anything that will cost too much, if that's the only solution I can deal with it the way it is.

2003.5 Garnet Fire 5AT
Wishlist: Nismo CAI, Borla Exhaust

 

I see that your wishing for a NISMO CAI, but i just installed a JWT pop charger with a Z tube and it pulls much better and shifts quicker. Its suppose to add 11RHP to the Z so i think we are not too far off. I would highly recommend this mod. PM me if you want to know where i got it. I don't want the mods to take off my post!

 

i think the grounding kit should help w/ shifts also. look in the technical section.

 

Its the memory in the ECU chip that's causing this. the ECU memorizes the way you drive. If you like to rev high in manual mode, it memorizes that and adapts to your driving habits. I'd recommend you reset the ECU (find the fuse and pull it, or disconnect the battery for 1/2hr), then go into manual mode and drive the way you want the auto mode to drive. Someone correct me if I'm wrong, but that's what I've heard and haven't been told otherwise.


2K4 G35S 6MT, Diamond Graphite/Graphite, Premium Pkg
2K2 GS300 5AT SportDesign, Millenium Silver/Black

 

From what I hear, most Nissan/Infiniti VQ series cars with an auto tranny will have that shift lag The reason is so the car will have more of a smoother shift feel, than a sporty feel. It is very common especially with the Maxima's whether it be with the VQ30DE or the VQ35DE engine, same goes with the Altima with their VQ35DE engine. One way is try to tightening your throttle cable a bit...be aware by doing this to much might make your car idle higher and may void your warranty if anything goes wrong..so do it by small increments. You might see a very small gain, but your throttle response off the line is where you might see the small gain. When you tightening your throttle body cable...make sure there is give, about as much has a cresent moon, when you push down the wire after tightening it, before the throttle body opens. If you push the wire down and its more than a cresent moon just before the throttle body opens, then you can tighten it a bit more. If you press it and opens the throttle body before it the wire looks like a cresent moon...then if you tightened it to much, you it need to have tad bit more slack.
NOTICE:
I am not responsible for anything if this mod you attempt causes damage to your car if you try to do this. It might be best if you have a mechanic with you or if you are a mechanic it might make this easier...sorry if this "how to" sounds confusing. Im no english major ya know...lol

Shift_DEZ' NUTS
www.midnightimpulse.com

 

All the shifting is computer controlled so tightening the cable will not do anything. The adaptive learning alluded to earlier also occurs only when in AT. It does not seem to learn manumatic patterns.

My sense is that if you are just flat out taking off - say from a redlight - leaving it in auto is best. If you are in traffic etc where you want to accelarate quickly into a spot etc then manumatic is best.

 

What you are talking about is a true manual shift mode which you can't achieve without internal tranny work. (warranty issues ?)
What you can do is optimize the shifting by doing the Easy ECU reset (look in FAQ/DIY) or by disconnecting the negative terminal of the battery for 12 hrs. (not so convenient).
What you need is internal tranny valve body work, and if I'm not mistaken 'gurgenpb' has some info on this.
Another way is to improve the breathing at 6k rpm. You can do this by adding a K&N filter, or adding a CAI, or Crawford Plenum to optimize engine breathing, or open up the exhaust by adding an aftermarket unit, ( I have a Borla TD), and by having the existing ECU reflashed by Technosquare. (lots of info -- do search)
As you can see it's not going to be very easy or cheap to get what you want, and there may be some warranty issues to boot.
There are some subtle differences in automatics that go in the Coupe and Sedan, that will allow a more controlled shift at high rpm's but trading to a Coupe may not be practical (or cheap).
My suggestion is to do the ECU reset and live with it. It's the nature of the beast. Add a CAI and maybe a Crawford as well as the Exhaust.
Adding a Grounding Kit will help shifting (amongst other things) and is a great, and inexpensive, mod. (Tech Forum)
If you get a chance to drive an A/T Coupe do so. You'll see the differences immediately.
Good luck with your mods, and congrats on your G. They're great rides.

BTW Xmax, There is no more cable per adjust. It's all computer controlled now and 'drive by wire', ie no direct link.

Safe G'ing

<font color=red>G</font color=red>S<font color=green>M</font color=green>
<font color=red>G</font color=red>S<font color=green>M</font color=green> <font color=black>Silverstone Coupe</font color=black>

 

Oh ok....i guess Infiniti looked at that problem for the G35, but it seems to be common problem for the Maxima's from 95 to 2003, and a few 3.5l Altima's. Cuz i did notice a better throttle response when i tightened my throttle cable....but that is for my 97 Maxima.

Shift_DEZ' NUTS
www.midnightimpulse.com

 

I don't hink we have a throttle cable (aren't we drive by wire).

As far as the throttle body, it's MeanGene who did it , not me. I am currently on the quest to find the easy and far more practical "drop resistor mod" for our cars. Can't find the damn thing!

Stillen is coming out with a valve body swap in mod. So you can always wait for that!

Gurgen

 

First off, thanks to everyone for the feedback. I'll probably try the ECU reset and see how it goes from there. Sometime in the spring I'm planning on getting a CAI, I was planning on a Nismo setup but I'll check all options before I make a purchase. I wasn't sure the ECU reset was something that would help in this case because driving normal (if there is such a thing) it shifts smooth. Grounding wires should be easy enough too so I may try that in the near future.

gsedanman- any extensive tranny work is out, it's not that big of a deal for me. If it really was a problem I would get a 6MT even if the wife can't drive one. How is the Borla working out for you? Any negative impact?

2003.5 Garnet Fire 5AT
Wishlist: Nismo CAI, Borla Exhaust

 

G4Teej, Enjoy your Garnet Fire Sedan bro, I had one last year for a while, and in many ways I miss her.
Nothing negative at all with the Borla. That and the Crawford are my favourite all time mods. And effective too: In the SportZ Magazine Shoot-out done last summer, the Borla rated highly in hp/tq increase, and it was noticable in the 'butt dyno'. It looks good, fits well, sounds better than stock, and is one of the least expensive systems..
Good luck with your mods, and enjoy.

<font color=red>G</font color=red>S<font color=green>M</font color=green>
<font color=red>G</font color=red>S<font color=green>M</font color=green> <font color=black>Silverstone Coupe</font color=black>