Can someone give me an idea how much power the 6 speed manual of G35 coupe year 2003-2005 can roughly hold safely without playing with fire?

 

How much $$$ do you have?

6psi of boost is generally considered safe, but thats a really really generic figure.

Get a good tuner, and plan on spending 10k+

 

I actually need to know how much the stock transmission is capable of holding. Once I know a rough figure I'll know the rest.

EDIT: maybe I wasn't clear wnough, but without spending any kind of money for transmission upgrades, how much whp/wtq can be run safely?

 

From my understanding, going FI at all on stock 6MT will require a new clutch.

 

+1, the only upgrades I seen for a tranny were Valve body upgrades for a 5AT.

 

Though this isn't the point of the thread, for the 5AT you can do more than valve body. You can also build the tranny by replacing the clutch packs and all the other tranny internals.

 

This doesn't really give a streight answer. I mean you said "6psi of boost"..... that tells me nothing because 6psi with a GT42 will make 3 times the power of a T40 @ 6psi. I was under the impression that you guys boost your cars? Doesn't anybody know what kinda power the stock 6spd can hold without needing ANY upgrades besides the obvious (clutch and flywheel)?

 

400 at 9psi with stock injectors....just ur basic vortech blower with the 3.12 pulley

 

The forced induction section on my350z is probably where you wanna be.

However, I don't think there's any magic number safe threshold for the transmission. A few guys have totally grenaded the tranny at 500hp to 600hp. I know that's a large number, but that's the best I can tell you. See Alberto, thawk408, and 350zcalb(there are more, but that's all I can remember off the top of my head).

Some guys break shift forks. Some guys complete eat off the teeth of the gears. Some guys will go forever on the tranny. The simple fact is that your question is *not* simple to answer; there just haven't been many 500+hp 6MT cars driving around long enough to have a statistically large enough sample size.

Of course, you want to start thinking about the axles above 450/500hp if you're drag racing. I've got 300 1/4 mile passes on my stock transmission, pumpkin, and axles, though I'm NA. The pumpkin is pretty stout. I've only read of a small number of people having pumpkin problems, and I don't think any one has actually totally destroyed the rear diff. People have had problems with the halfshafts shearing from the diff, or the diff actually becoming dislodged from the driveshaft though.

Here's a thread on my350z that looks at the 6mt internals and features a little bit of analysis: http://my350z.com/forum/forced-induc...internals.html

hope that helps.

 

listen to this man

 

Since you are asking about the lmiits of the stock tranny, we've hit 877whp DJ with the stock 6MT, and a Carbonetic Triple Disc Clutch no problem.

Now, for drag racing, and harsh shifting abuse, only time will tell. But it's safe to say that the stock 6MT can handle the 500-700whp cars we put out all the time. I can count on one hand..the number of customers that have had trans problems, and its usually the guys that beat the **** out of the cars on a daily basis.

 

You dynoed at 700whp but how safe is that? Will it only be good for one run?

 

We have several customer cars running at or near 700whp, and all on their original trans, and one of them was used in time attack, and lots of track days.