EVO III GT Exhaust Mani vs. T-25

[PieEyedPiper]

Ok, so long story short is I've had a nightmare of an installation process the last 2 days.
I have completely the installation of the EVO GT mani and a ported 02 housing with a stock T-25 and stock exhaust piping.

The manifold came with a larger gasket than stock, but I re-used the stock gasket (actually a new one, but its a stock part) instead since I figured I'd rather gasket match the T-25 than the manifold.
Using the larger gasket it seemed it would ahve been moee prone to leaking in my case.

I'm having 02 sensor difficulties after the install ( I snipped the wires and had to re-solder them...http://www.dsmtuners.com/forums/showthread.php?p=151099931&posted=1#post151099931 ) but apart from that the spool up sound is 100% different and much slower and less repsonsive. Is this because of the mismatched inlet/outlet of the turbine housing and the GT manifold?

Sorry for the long post, but I'd appreciate some advice!
Thanks

AW jeeze, sorry for the cross posting! ... totally forgot i posted this one (beer)

 

[tsiawd1028]

yeh the gt manifold is cast to match a 7cm exhaust housing ported with no sealing ring,thats noticable bigger than an unported t25 turbine inlet, your creating alot of turbulance in that turbine inlet, now you can port the t25 to match and you spool up would be better than stock most likly, but most people would say thats a waste of time since its such a small turbo.

If you low on funds, pick up a 14b from a 1gen turbo manual only for around 100 bux. buy an install kit to get it to work with you 2g . port it to match the 7cm gasket, sit back and enjoy a nice increase in power. your stock fuel system is going to be able to support the 14 b at 17 to 18 psi, and compared to a t25 at whatever max boost it can hold to redline, your gonna gain around 50 hp.

 

[PieEyedPiper]

Thats pretty much what I figured. Lots of turbulance.
Amazing how I didn't see this beforehand

I set out to fix a cracked 2g manifold with an upgraded EVO III GT manifold and a ported 2g o2 housing while I was in there and I netted myself 2 days worth of shitty, stud-breaking work, an injured o2 sensor yet to be confirmed as working, slow spool, and power loss.

w00t!
Thanks for the info, tsiawd1028.

 

[tsiawd1028]

yeh its actually a quite sizeable step differnece,

. you dont want to drive a car slower than before, so of course you have to upgrade your turbo now, your obligated to. I would say port the turbo, but in all honesty the t25 isnt gonna make you any power so i wouldnt even bother wasteing the time porting it. UNLESS you were completely sure your never gonna change it. But nobody keeps a t25.....

Like said the 14b is a nice step up for cheap. its definately gonna be worth it.low 13's and high twelves are definately possible on awd cars with 14b

 

[IslandTSI]

Just port the t25. No reason not too, and it will make some more torque. And alot cheaper than spending $250 for a 14b and install kit

 

[Cs4g63]

Just port it. No harm in trying to make it work when all it cost you is time.