Author Topic: T3 on AAZ, 2.5" or 3" exhaust? (Read 2689 times)

Dirtrag2 · « **on:** June 02, 2008, 04:05:22 pm »

hi everyone, I finally got around to stripping my old K03 off my 97 jetta and replacing it with a T3 an' going to have a full exhaust fabbed up. should I go with 2.5" or 3" ? Keep in mind that the whole thing will be done from turbo to the end.

also, on a T3 if I want to run 30 psi boost, do I have to block the wastegate??
seems to me I read something about thes in here :oops:

Chestrockwell · « **Reply #1 on:** June 02, 2008, 10:25:28 pm »

I would try to go for 3" exhaust for sure. I have a t3 on my AAZ and I had to weld the wastegate shut to get to 30psi; this is hard on the turbo and makes a lot of heat so I use the max fuel screw to keep the boost down around 25. This turbo had new bearings 30000k ago and oil changes every 6 months and it's loose already.

Dirtrag2 · « **Reply #2 on:** June 03, 2008, 09:41:57 pm »

ok 3" it is :lol:

how do i go about blocking the wastegate? 'cause i would like to run 25+ psi

Dirtrag2 · « **Reply #3 on:** June 05, 2008, 05:42:48 pm »

turbo is going on tonight, if anyone can tell me if i should block the wastegate and if so how it would be apreciated!

foxracer1 · « **Reply #4 on:** June 06, 2008, 07:39:42 am »

I would get a manual boost controller. I have mine blocked off and it obviously makes more than 20 it pegs my boost gauge out.

As Chestrockwell said its going to be very hard on your turbo. I also have 3".

I welded the passage between the wastegate port and the exducer of the turbine. Then i just put the plate back on the wastegate. I plan to make a dump pipe for the wastegate and run a MBC.

The turbo really wakes up around 10PSI it shoots up past 20 on my gauge very quick.

Dirtrag2 · « **Reply #5 on:** June 08, 2008, 11:23:54 am »

thanks for the advice... i'll be looking for a boost control system then.