Muzza03

The way things are going here, Holden (local GM arm) are struggling to sell the new Commodore (you Yanks know it as the Buick Regal). Its not a bad car, but the previous Commodore it follows you would have seen as the Chevy SS - sold a heap here.

The V6 version is OK, but not really that fast (considering the last SS had an LS3 fitted and was RWD and available in both sedan and wagon) despite being AWD and a very tidy handler. The Opel made Buick/Holden newbie needs twin turbos to really appeal, but everyone is staying away from the NA 6.

And the 2 litre turbo is FWD only.

VW Passat and Skoda Superb have it shot to bits already.

Several people ove here in Oz have had issues over the years with oil on the AMS, screwing their air flow data and hence the tune, resulting in bad running.

Good tuners avoid them.

Add to the fact that, well the ain't no free lunch - the "greater airflow", well at least initially, is from having bigger holes in the filter that allow small fines to get through, polluting your engine oil and wearing your bores and bearings.

And when they get dirty, they flow worse than factory paper filters.

Hiya, if you head over to the Aussie forums (being migrated at the moment so give it a few days) http://forum.liberty.asn.au/index.php?sid=2b72fc63c64cd1624739ea7e232ed2e0

They are up again - use this link: http://forum.liberty.asn.au/viewtopic.php?f=73&t=35044

There are a couple of people with similar issues as we have the Auto GT here, dropping out of gear and back in. The suspicion was that one of the valve body solenoids was acting up but no result yet and can't see bc forum is temporarily out.

I and others with auto GTs have had the occasional soft thump/push like someone had rear-ended you softly, often at low speeds in slow moving traffic when you are lightly on/off the throttle, we think due to catching the auto between downchanges and the extra throttle grabs the gear too quick.

The auto and valve body is the same between 3.6 and GT and it's nothing like the previous 5 speed. The only difference is the TC, it's more slippy in the GT, high torque.

Sounds like a good start with a flush and check of the basics, also a reset to forget whatever it has learned may help.

Hot day today in Melbourne - 38C (100F).

Lib basking in the late afternoon sun....

IMG_1473 by Murray, on Flickr

Yeah - that is interesting. I will ask my tuner if he's experienced it, though he suggested its removal initially, and he has very extensive experience in Subaru of all kinds.

I need to log my car as I haven't for a little while and see if there's anything awry.

Turbulent airflow can screw up your MAF readings. The stock intake is designed so the airflow past the MAF is as smooth as possible. Removing the resonator/milk jug can add turbulence to the air flow.

Look I really don't think its possible to get significant turbulence (ie: streams of higher and lower air flow) through the air filter as the paper homogenises the flow through it as a function of filtering.

The milk bottle opening is pre and below the filter to help reduce intake noise resonating inside the air-box before exiting out the front intake, to meet drive-by noise regs. As i said earlier, the NA cars usually make far more intake noise, but all Gen V's got the same intake and air box.

Turbo cars with the much longer intake/IC pipe and IC tract with the turbo chopping the air seem to create way less noise.

I have seen some tests (somewhere!) of people removing the Helmholz resonators along an NA engine intake pipe (post filter/MAF) and losing power/torque. They can act in that placement to reduce pressure wave variation and improve cylinder filling from what I have read, though they are tuned to work at certain rpms by their opening and bottle size for side-branch ones and chamber size for in-line ones.

^^^ For the milk jug delete, did you do a tune afterwards? Some are saying that they get CEL (Check engine lights) after doing it,. maybe it is just the turbo models.

Nah, no tune needed for that. It's a pre-air cleaner noise resonator. Mind you, I couldn't hear any more induction noise after removing it. As it's the same intake and air box on NA models it would probably serve a noise purpose for them.

But as my tuner pointed out, it could allow more cool air into the air box.

But it would probably help release a bit more BOV noise with the new one installed.

Has anyone done or seen a good write up of installing the Grimmspeed AOS on the 5th gen LGT?

Hi - here's my install of the SG Motorsports AOS. Very similar to the Grimmspeed except the SG has one port in, whereas the Grimmspeed is two ports in. This should helpin ID-ing the pipes etc if you are going down this path.

So for the grimmspeed you just run 2 separate pipes - 1 from the crankcase vent, and 1 from the head vents side by side to the Grimmspeed unit.

(With the SG unit I just tee-ed them in together in part #8 of my post.)

http://forum.liberty.asn.au/viewtopic.php?f=73&t=33993

Cheers.

Hey all - here's a little fitting guide I made for mine in stock location: http://forum.liberty.asn.au/viewtopic.php?f=10&t=34135

I have the GFB Plumback Mach 2 T-9133 on my Gen 5 Auto wagon.

Noise-wise, its 2-3x louder than stock (I have the milk bottle/airbox resonator deleted) and nice and wooshy when you give it the gas then back off; for full-recirc its noticeable with the window down.