STI Y-Pipe on a stock WRX intercooler?

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CGH05
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STI Y-Pipe on a stock WRX intercooler?

Postby CGH05 » Wed Mar 07, 2007 6:07 pm

Hoping for an answer without removing my I/C...

Will a MY03-05 STI Y-Pipe fit straight on to a MY05 stock I/C and what type of benefits would it result in?

Cheers

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Roadgrime
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Postby Roadgrime » Wed Mar 07, 2007 8:05 pm

Yes it will fit.

The cast item will flow better, but mostly its used because it can handle higher boost pressures more safely. The turbo may spool up a liitle quicker due to it's better flow, depends on your setup.
** Standard MY00 wagon for sale ** SOLD!

No more Rex, but I'll still hang around here whilst I'm mourning....

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cpitts
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Postby cpitts » Mon Mar 19, 2007 9:59 am

Yes it fits.
Yes it's worthwhile.
Yes it improves the cars linear deliery of power.

This graph below shows the differences. Dark blue line is before Sil Y pipe, Red is with Sil Y pipe. No other changes took place, it's a before and after dyno.

No extra power, just smoother.

Image

Think of it as reducing flex and making the airflow more laminar in that pipe.

Well worth it in my opinion. Great for drivability.


EDIT: More-so, peak torque was a lot earlier than before:

Image
'07 Lib GT Spec B <- adjusting
Done: Intake, Brakes, Stereo 90%, bars, AVO TMIC
To fit: Sil intake, ECU, 3 Port, Walbro
WWW (button below) for my Subaru/Audi dyno's, detailing, pics and mods!

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xplosv
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Postby xplosv » Mon Mar 19, 2007 5:09 pm

cpitts, thanks very much for those dyno graphs.

The proof is definetly in the pouding!

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cpitts
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Postby cpitts » Mon Mar 19, 2007 5:32 pm

pleasure.

I assume you mean pudding, not sure I want a pouding (or anything similar to that ;) )

This thread is exactly the reason I did these tests.

There's a 3rd graph to go with the above graphs (AFR change as a result of just the Y-Pipe) and it's nowhere near as nice as the above ones. It shows the result of the change, and that is an extremely rich running car.

Have a look on my WWW (link in sig below) and you'll see what I mean.
'07 Lib GT Spec B <- adjusting
Done: Intake, Brakes, Stereo 90%, bars, AVO TMIC
To fit: Sil intake, ECU, 3 Port, Walbro
WWW (button below) for my Subaru/Audi dyno's, detailing, pics and mods!

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xplosv
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Postby xplosv » Mon Mar 19, 2007 8:29 pm

Cpitts, yeah pudding (it was a LONG day).

This is on the MY05 yes? Your website has a mass of info too btw, great your willing to share so openly.

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cpitts
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Postby cpitts » Mon Mar 19, 2007 8:36 pm

Yep, MY05 and yes I share my research as I'm just an average joe who believes in empirical analysis with this hobby.

So often everyone's out to force feed you heresay or 'the fashion' rather than facts. I like facts. Even if it costs a few bucks to get em. ;)

Btw, the information should be consistent for MY03->MY05 engine range and otherwise be the same for all EJ20T's :) I'd even hazzard a guess that it's pretty similar for the new 2.5T's as well as the mods I've done are around poor design and basic airflow/fluid dynamics.
'07 Lib GT Spec B <- adjusting
Done: Intake, Brakes, Stereo 90%, bars, AVO TMIC
To fit: Sil intake, ECU, 3 Port, Walbro
WWW (button below) for my Subaru/Audi dyno's, detailing, pics and mods!

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Random Dude
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Postby Random Dude » Fri Nov 09, 2007 12:39 am

Good work. Moving this to FAQ!
Brenton

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