I have uprev right now and it's working pretty well. Still have down shift lag tho.

What's your dyno number and 1/4 time?

i never had any downshift lag? only thing i ever had was the little rpm jump when shifting up from 4th-5th and after my tune thats gone away 98% only had it once in the 800 miles i put on it since.

Hmm really? Guess I need to get it re tuned.

Not sure if anyone saw but would be curious if this would help at all in learning more about the transmission. $60: Link

it may be something with yours in general since they all are different slightly.

I blew the motor yesterday.

Sent from my SAMSUNG-SGH-I717 using Xparent BlueTapatalk 2

what happened?

Ouch!

sub'd

U sub when a member has some bad luck? Smh...
From what Valpoz wrote the motor blew and NOT the 7at tranny which this thread is about.
Good luck gettin the ride back up!

I just saw the thread, get off my :nutswinger:

I was in this group, :( Engine went boom.. But was 457 WHP and 330 WHTQ 7 SPD AUTO.

What happened?? CYL 3

Was it the tune?

Sub'd

No, issues from the origonal install, TB harmesss had breaks(5), Fuel pump was dieing, Feed line was cracked and leaking, caused the car to lean out -ROD knock and :ughdance:

oh BTW all misdiaq'd by the installer. :shakes head:

Throttle body harness was broken? How?

And if the feed line was cracked it didn't piss fuel everywhere?

Here's my plans so far for forced induction and I'm very worried about the reliability of my car. I want to get everything together and cooled/upgraded properly.

Already ordered:
Fast Intentions Twin Turbo kit
Fast Intentions Oil Cooler kit 34 row
Fast Intentions Cat Back Exhaust with high flow cats
GTM HD Transmission cooler kit

Should I get a GTM valve body upgrade or a transmission upgrade which inclues the valve body:

Valve body upgrade kit:
GTM Motorsports*::*AUTOMATIC TRANSMISSION*::*Valve Body Upgrades*::*GTM Valvebody Upgrade for 7 speed A/T

Transmission upgrades (which one do I need?):
GTM Motorsports*::*AUTOMATIC TRANSMISSION*::*GTM Stage 3 Transmission Upgrade
GTM Motorsports*::*AUTOMATIC TRANSMISSION*::*GTM Stage 3 Transmission Upgrade
GTM Motorsports*::*AUTOMATIC TRANSMISSION*::*GTM Stage 4 Transmission Upgrade

Do I need a differential oil cooler or is this unrelated to forced induction?
https://www.gtmotorsports.com/produc...1&cat=0&page=8

Seeing you have HFC, why did you pick those over down pipes?
Also, what are your goals for this kit, reliable street power, light tracking? Do you have a HP limit in mind?

This is what i'm looking for out of my 7AT, with the new gtm tt kit.

Just street fun, and power around 400-450 whp & 380-400 wtq.

By what has done with the high 300/low 400 TQ boosted cars it seems a good solid transmission cooler & tune can hold up fine for awhile with street driving. Keeping in mind that the top couple gears will be off limits for boosted runs.

Cool deal man thanks, i was thinking trans cooler, tune, and the VB upgrade. I just didn't know if this would be enough for the 16g gtm with 9-ish psi and 2.5" FI catback.

I'm probably going to get a conservative tune because I'm looking for reliable street power and I don't track at all. 400-450 hp /380-400 tq sounds good to me as well.

Any news on this?

Lol

You should be fine. 481hp and 427wtq and even after I tore the system off the car it still ran like a champ. I had zero slips, clunks or anything. As Dreamer said 6th and 7th are off limits. I only pushed it from first through 3rd most of the times. Hell I even dumped it into 3rd from 6th on the highway for a quick boost.
I guess I had a Frankenstein transmission or something because I had ZERO problems with mine and had 2 1/2" pipes and no transmission cooler.

Just keep a towel with you....to clean up the mess you make when you first get on it.

:icon18::icon18:

Need your opinion...
 

In your opinion which system is a better match for the 7AT?

TT or SC ?

Let's say with a VB Upgrade, Trans Cooler and a proper tune.

Some of my thoughts were a SC because of its lower torque would help the Transmission last longer or the TT because when you hit the gas the lag allows your tranny to downshift where the SC would not ??

Your thoughts :tiphat:

I believe from the failures we have seen, in the upper gears, it has been the TQ that is more responsible for the damage than the HP. Mainly because the TQ is what is going to punish the transmission early on and fast while HP gradually increases throughout the powerband. Saying the SC lower TQ will help in the long run probably is not ideal as both are going to put extra strain on the transmission.

Now onto the specific TT or SC, since you threw in the VB upgrade either will be great. At that point it will boil down to what your goals are & expectations for the kit(s). Some of your key differences are, SC is a bit more instant response while the TT has that small spool (.5 of a second or less), the SC kits have a bit more linear progression through the powerband where a TT is very upfront.

Dreamer which system runs cooler and is less finicky from your experience and or feedback?

Also Is it best to manually shift when wanting to boost so that you can make sure you only boost in 1-4th and stay away from 5-6-7 ?

What are your boost & shifting practices?

I know sometimes it seems like us AT7 owners really want to make this transmission work with a FI setup but I really do enjoy this Auto more than even my previous Manual tranny twin turbo 996.

:tiphat:

I should preface some of my posts with I actually don't own the 7AT, I have had the chance to stumble upon certain reading material which I have shared & driven a built block TT 370z with 7AT.
Running cooler between a SC/TT will be the SC just because you are not trapping heat around the block to turn the turbine to create power, but remember a TT (or T) is going to be more efficient.

When I drove the TT I always did manual mode just because it was easier for me to correlate the boost v rpm v gear and make sure I was driving right, but that is just my brain which has driven manual only transmission (unless it is a rental car). I think without a VB upgrade staying out of boost in the top few gears is wise just because of the strain it will put on them and cause early failure. Plus redline in 4th is easily in the mid 100 speed so that is probably pushing what most need.

Bingo. That is the advantage of the Twin Turbo on an automatic. When you hit the gas in the higher gears, the turbos aren't producing much extra torque and the transmission will downshift to a lower gear. The beauty of that is not only can the lower gears handle more torque, but it puts the engine in the power band for a nice wallop of acceleration.

The Supercharger, on the other hand requires a more attentive driver using manual mode since rolling on the throttle in higher gears will put more torque through the gear before the transmission downshifts in normal mode.

That said, our Valve Body upgrade will really help out with that since the transmission will downshift more readily.

@theDreamer I wrote an article a while back regarding forced induction and automatic transmissions if you would like to add that info into your first post, here is the link: http://www.gtmotorsports.com/Technic...ansmission.pdf

-Mike

Mike, adding a link to your PDF article.

Also have added the OEM transmission cost & part number for reference.
Nissan:

7 Speed Automatic Transmission (310C0-Z34002) - $7,368.38

sooooo you're saying go blow the tranny then instead of OEM pay $7k for GTM stage4?

That might get a bit expensive by the 3rd or 4th transmission. :stirthepot:

haha i really just wanna see GTM put one of theirs to the test and find out the capabilities. then we can justify if it's worth the money.

if they have already i have yet to see details.

i know that one guy put one in his car but is N/A at the moment so that shows nothing important.