370z 7AT problems with GReddy TwinTurbo tune - what to do?
 

Hi guys,

I've recently fitted a GReddy Twin Turbo kit on my Nissan 370z RHD 7AT. After running into to so many problems with the car being a RHD and the steering rack interfering with the turbos, managed to overcome all problems and took the car for tuning at a respectable tuner here in UK.

Mods fitted on the car:

- Stillen Gearbook Oil cooler
- GReddy Twin Turbo kit
- GReddy ProFec Electronic Boost Controller
- Walbro 485 Fuel Pump
- Interior Dynamic 1000cc injectors
- CJM Stage 1 Fuel Return System
- CJM custom red anodised Fuel Rails

The tuner tried to tune it UpRev, but he's saying the gearbox can't handle so much torque the TT kit is making, therefore it just blows through the clutches. Apparently the clutches are slipping.

Now, to sort this out I would normally have these options:

1. Try and get the valve body upgraded by GTM (wonder if there is any slight chance Sam could do this without wasting my time and money, we all know GTM...)

2. Convert to a 6MT gearbox, get uprated clutch etc

3. Remove the kit from the car, sell all parts and the car and then buy a GTR and be done with it, this being the last resort.

What do you guys have experienced with 7AT cars and TT kits in US?

Also, has anyone here managed to convert to 6MT properly and everything works including SynchroRev?

Any other bit of advice is more than welcome, thanks a lot for your time.

P.S.
Before you send me here: http://www.the370z.com/forced-induct...370z-info.html I've already read the whole topic and relate more information to the tuner :)

Just spoke to Dave @ Level Ten here: Level 10 Nissan PTS Bulletproof Torque Converter RE5R05A,RL4F03A,RE4F04A,RE4F04B,RE4R01A,RE4R03A,RE 5F22A

They sound like really nice guys, been offered the following:

- valve body upgrade
- torque convertor
- internals - master overhaul kit

5 days turn around time

The gearbox will then withstand 700hp and big torque figures, awaiting confirmation on this.

Also comes with 12 months warranty or 12.000 miles.

$3700 roughly.

What do you guys think? Good alternative?

So I'm guessing you are putting in a 6MT if you go with Level Ten?

No, will ship my 7AT to them for upgrade as above

That's odd, Did he up the line pressure for the trans, If not it will just SLIP really bad.

considering the only other option would be the GTM stg4 7AT set-up and that running $6800 plus GTM being nonexistent anymore........

then yes that level10 set-up for $3700 sounds like a good deal to be honest.

if that was around or if i'd known about it a while back i would have boost. having a 7AT and GTMs high priced AT upgrade turned me off from boost.

Yes, I've been told so.

Just booked my apt with level 10 today! Giggity Giggity!

Wow more n more ppl are gonna go back to bulletproof manual tranny eh?

It should bolt right up and all the electrical is already there just buy an aftermarket cmc,csc, clutch, flywheel, aftermarket clutch pedal and all the clutch fluid pipes. Or am i wrong?

I don't get what you're saying

Well basically lately ive been reading ppl having limitations on the track and boosted Z's with the 7A tranny. Also replacement auto tranny cost was like 8k(someone on the forum mentioned) so if lets say a person would consider installing a manual tranny on a car originally designed for ether, but assembled with an auto tranny, is going manual the cost of parts all together = new auto tranny. And will it bolt right up?

Also ^that vs upgrading the auto tranny, parts n stuff.

Also vs if u just buy the OS Giken 88 manual tranny for 8k

For the 2nd time, no, is not back to MT, it's upgrading the 7AT at half the price of GTM...

Good stuff. Sub'd!

:facepalm:

I'm posted.

Please let us know how it goes, I'm very interested!

Gearbox on the way to Level Ten now :D

http://img.tapatalk.com/d/14/09/25/utumutej.jpg

http://img.tapatalk.com/d/14/09/25/ga9y2yqa.jpg

http://img.tapatalk.com/d/14/09/25/y8asygun.jpg

I might get it to support up to 1000 bhp, in case (read for when) I decide to forge the engine :)

wow good luck with it. sounds like there might be hope for the 7at guys. we get tons of 7at owners asking for boost, but we limit them to S/C setups instead of the T/T because of exactly the situation that you are in. All the best and keep us posted on how it turns out.

BTW- which shop is doing the work? My buddy at Abbey Motorsports are in Surrey and have done quite a few projects with us.

The gearbox made it to Level Ten yesterday, work starts today, most likely building it to 1000bhp strong :)

The box is being rebuilt as we speak, here are some photos they've just sent me:

http://seology.com/350z/2014-10-03_14-16-24.jpeg

http://seology.com/350z/2014-10-03_14-18-04.jpeg

http://seology.com/350z/2014-10-03_14-18-45.jpeg

http://seology.com/350z/2014-10-03_14-19-30.jpeg

http://seology.com/350z/2014-10-03_14-20-08.jpeg

i want!

If "You want!" based on the photos of his burned up trans, try not to have a coronary if they post pics of the new parts

you know what i meant lol

i want my tranny to be built up, then boost, the whole process.

ya dick lol :bowrofl:

Subscribed

Mmmm -- good stuff :yum:

Looking forward to hearing more as this comes together :tup:

Subbed

Very interested in your build! Goodluck and subbed :tiphat:

SUbbed. I have a lot of hope for the 7AT now.

BEAST! cand wait for the End Result 7AT FTW :P

Just got an email from Dave:

:worship:

Just makes you feel like shouting:

GTM SUUUUUUUCKS!!!

This has got to be one of the most anticipated threads for me.... I'm on pins and needles! I can't wait to see some video of the car ripping it at a track.

Tell me about it!!! Picking up the gearbox tomorrow, should be in the UK mid next week, can't wait to install it and then tune the car!

Meanwhile, this is how the car was sounding with the old gearbox :)

:yum:

mmmmhmmmm i love the sound of boost in the morning

Sprung a boner here! :leghump:

ha ha :)

Gearbox picked up by DHL, on the way to UK, yeeeey :)

SUPER MEGA FAST SERVICE!

Dave is a very nice guy, always helpful and knowledgeable, highly recommended!

Can't wait to fit the gearbox and have it back on the dyno!

What's been done to it? Clutch packs? Flex plate? Torque converter?

So from the day you shipped your trans from the UK, it took only 2 weeks for them to figure it out and build it up and ship it back?

That is some serious service! wow.

I like the sound of your exhaust, what is your setup?