Well I got done with the turbo install on thursday and wow blew 3rd gear this moring. I have a bid exhaust leak causing boost to not build as fast as it should but I was out doing a test run and shifted to 3rd and it went. only had maybe a 150 turbo miles on the tranny. Im not sure what kind of power im putting out but im am maxing the stock maf meter out at about 6200 and I have stock dek injectors running about 42 psi and they are at 100% after 6000 and the air fuel will creap up to 11.7

Ok so what can i do to build this tranny to hold some power?
Also Is their a better stronger 3rd I could use from another tranny

 

dam that sucks. Dont they have bullet proof trannies or cant you get the tranny treated to strengthen the gears? 3rd gear is always the first to blow for everyone...died on me with my last maxima when I was boosted....

 

No you can heat treat them but it still up in the air if it will stand 350-375 horse power and for how long? The hell with im doing a 6speed swap. Sentra guys are running 400 to 600whp on them and no one so far has had any problems with the grears!

 

Ah yes, Always a GOOD DECISION! . lol. Yea to really hold up to high torque and horses, we have 2 options, shot-peening and cryo-treating our 5spd tranny, or just swapping a 6spd into it. Tyllies proved their strength (and that of the OEM 6spd clutch) with his 11.55 run on it.

 

I am building up a 5spd at the moment that will handle the power, and I will post my results when I am done. I would think that 350-400hp is well over the design limit of the 6spd as well, so it is only a matter of time till that breaks as well. It is too big a installation headache to do a 6spd swap only to break gears again.

 

yeah but what can do to the 5speed tranny to make it hold the power....nothing. Thier is a guy right here in columbia Sc that has a 450hp spec v that has race over two season and has not broke anything as of yet and is running on slicks. Maybe travis will chime in on this! Neal had all the work that you could possible do to it and it still broke. Now if your going to speed thousand of dollors on a custom gear set yeah maybe. But the gears are very skimpy in the 5 speed trans you can treat them but its still not going to hold up. And the 6speed tranny will be quicker to get upgradded parts than the 5speed due to its the same as the spec tranny. Not trying to be an A-s-s but thats my 2 cent

 

I agree 100% with you. Even NA I was fed up with the 5-speed. 6-speed all the way, itll be a pain but once done youll be able to sleep at night. And anything you can do to the 5-speed, you can do the same with better results on the 6-speed. Longer 1st gear for traction, and 2-5 are shorter. Way better all around, and more recent and easier to find in good condition for YEARS to come.

I got tired of the glass drivetrain and Travis said the 6-speed internals are way beefier, which agrees with pretty much everything I have read.

 

Actually, with most turbo setups longer gears tend to do much better due to the way the engine makes it torque.... but... since the 5-speeds are so weak there's not really much that can be done about that.

I don't even have the option for the 6-speed so I'm currently devising a way for me to have a nearly indestructible 5-speed. No one will likely want to try it though but it'll be awesome. I'm just going to leave it at that for now.

 

yeah sorry Mark I wish their was something or a alternative for the 3rd gens. I hope I can get this swap done in about two weeks with my new injectors too then im going to test the limits of the vq30dek! I have all the proper tuning equipment to do so. If the worse case happens of blowing it sooner or later that give me the excuse to do the vq35 swap. I guess Ill stop at around 500whp if my set up will take it that far.

 

How do the 3rd gen auto trannies hold up with this much extra HP?

I know my beefed up 4th gen will hold the power but who knows, any oem part not strengthened can break. Either your lucky or not!

 

auto tranny is even worse for the 3rd gen

 

well take apart the tranny and see what exactly broke. from there determine what parts you need to make stronger.

i guess the saying goes...if you're not breaking parts you're not going fast enough...or something like that

 

thats very true... ask jcy98maxse. he was pushing 349 whp all year last year on 7.5psi, bumped it up to 12 sometimes and his tranny won't die. this tranny has been on his car for 2 yrs, been through many 2-3-4-even 5th gear pulls and still holding strong. year before this past year, it took many 125 nitrous hits, it is a stock 01, that is it.

 

3rd gear on the verge of going tho... with the new setup , I wouldn't be surprise if it went soon.

 

Mark- Just mill 1/2 off the 6 speed bell housing and get an adaptor made!! Ask maxmaxima91 about the cnc work...

Maybe Its best if you just ignore 3rd lol.

~Alex

 

lol you said that last winter...

 

I'm actually working on something even stronger, insanier, wildieieieier than that... yeah... its that's crazy.

 

Um I was talking to a friend that has an extra MKIII supra tranny. And we were thinking that + wide body = reliable boost. Crazier then that???

~Alex

 

In a Maxima?

 

lol yea it was just a joke. I was reading some old thread about how some one wanted to put an RB26DETT in a max. But thats OT...GET on AIM!

~Alex

 

Ahh, ok (I wasn't sure if you were talking about the 240 or not, I got confused ). As soon as I get it finished I'll definitely have lots of pictures for everyone. It might be a while since I'm juggling the Maxima and the Z project at the same time. It should be an indestructible tranny for the Maxima though.

I need to go to bed though... I should have been in bed 2 hours ago and I have a big order of donuts to make tomorrow.

 

Has anyone looked into Z32 Trannies? (90-96 300ZX) I'm sure the bell housing would have to be changed or even a spacer, but multiple 240SX guys are running Z32 trannies, and they hold a good 400+

 

Z32 in the maxima?

 

yeah one slight problem though .......... Its rear wheel drive!

 

mtcookson are you trying to use z32 gears?

 

Well... I'm actually looking into the option of using a completely different tranny. I'll definitely post more when I get closer to figuring everything out and making it work right.