04 STI first time at a track with 6speed

[TranceDiablo]

So I went to E-Town on sunday in NJ to test my STI out.
I managed to get a 13.3 @100 before my Axel broke!

Im just wondering why the hell that happen. What Am I doing wrong.
First my mods:
Invidia turbo-back
K&N typhoon short intake
walbro fuel pump
perrin 3" turbo house
Open ECU tuned by Junior @18.5 psi

First off I had to lower the boost because after my launch and going into 2nd gear my check engine went on and I could not go past 3000 rpm.
After that I managed to get 2 OK times. I know I can do better.

Launch: I was pulsing the throttle between 5-6 thousand rpm (was it too high?) And then slip the clutch in. I was getting 1.76-1.72 60' times.
My axel broke when I shifted from 1st too 2nd and that was the end. Thankfully I was able to get home by putting the DCCD on lock.

What did I do wrong? Or was it just a bad axel. I bought this car 2 months ago used.

Thanx.

[YBNormal07]

Luck of the draw most likely. When an STi axle breaks, it is usually a front axle. Rear snappage is pretty rare. Sounds like you may be flat foot shifting (speed shifting) and this puts god awful stress on the axles/powertrain in general. The axles are the "relative" weak point of the STi powertrain, so look at it as better than snapping a drive shaft (you will never, ever want to feel what this is like as your driveshaft mutilates your entire undercarriage) or imho, breaking the clutch.

Also, it may have just been weakend in the launch sequence and the extra bit of "hit" when nailing second was the final straw. Lots of reasons. One thing you didn't say though was what air pressure and tires you are running? All of the stickies on launching for an STi say to raise the air pressure in the tires...I usually used around 45-50 psi. This promotes wheel spin...the best result when shocking the powertrain like that.

Also, someone may say this is a good time to upgrade your axles. My advice would be to put OEM axles in. Again, if something is going to break, an axle isn't a bad thing. Much better than a tranny or a diff.

Just to be curious, the STi you bought isn't silver with a Seibon CF hood is it?

[TranceDiablo]

Its a WRB STI. and thanx for the info.

As for the tires I raised the pressure to 38 front and 36 rear.

How should I shift in order for this not to happen again and to also have good times?