AVO turbo inlet pipe - who's installed one?

[05GTLIBERTY]

eBay for about $220

[Arith]

Thanks guys, @ $440~ odd dollars i think i will hold off if thats the case.

Yeah, this would be an 'after everything else is done' mod. But $440, is that AVO Australia or AVO America? Got mine through eBay America and had my parents bring it over.

[fatfrog02]

What sort of real world gains did you get out of this?
I haven't read up at all on the whole theory behind these pipes, not quite sure what it's exactly doing with these little nozzles?

When I installed my AVO inlet pipe, there was faster spool up at approx 200 rpm lower then without the inlet pipe. Also you I could hear a slight increased induction note. I would personally NOT get an AVO inlet pipe again, it is overpriced and the fitment is not that great. I have since removed the inlet pipe and gone back to standard.

I started to throw CEL after the inlet pipe installation so I would say that a tune or retune is definitely required with this mod.

As Jim said previously, it would be a nice to have mod after everything else is done.

[cpitts]

To add to this very belatedly, I've got some more empiricle answers to the above questions having done the install of one of these (on a 05 WRX) and done the before, after then post tune dyno's while the parts were being installed. And here's the low-down.

1. What it does -> Increases airflow into the turbo. Specifically, it reduces the effort required for the turbo to suck air in which means it can suck more air, faster and easier..... so the turbo spools faster.
Ultimately, you won't really get any or much more power but you WILL get noticable throttle response improvement.

Here's a graph of Torque changes on a 2l WRX with a stock TD04. You'll see the torque flattens as the inlet track is openned up:


This is Boost change as the pipes are replaced, again, you'll see the extra airflow/restriction removal lets boost peak earlier and earlier:



And the power changes according to this graph (note the peak power drop when the intake pipe is installed). You'll



2. Do you need a retune? -> ABSOLUTELY! The >MY01 ECU's (when they went 32bit [I think]) in Subaru's are horriffically sensitive to significant airflow changes. These kinds of parts changes will result in massively rich running and plenty of spare fuel in the exhaust (crackle).

You can see the massively detrimental affect of openning up the inlet track. AFR goes into protective mode and fuel economy goes out the window. That's why you need a retune! And also why you get CEL's.




And here's what it looks like after you retune it (power and torque) NB: car was tuned once before these parts were fitted:



And here you see less boost <3750rpm but equivalent or more power at the same RPM's. That's pretty much due to the more open intake letting the air get in easier.: