landcruiser 4.5 v8 air inlet gause

Submitted: Thursday, Jan 03, 2013 at 15:44
ThreadID: 99768 Views:4643 Replies:2 FollowUps:2
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G.day all I noticed on the inside of the air inlet housing about 1 foot to left of the air flow sensor there is a round piece of fine wire gauze. You can see it through the top of the air cleaner box . After reading plenty of articles about improving air flow by installing safari or other type air ram snorkel heads and 3 inch exhausts ect after seeing how fine this gauze is I believe by removing the gauze you would gain far more improvement in air flow restriction with these mods ect. Are people having it removed and what are your thoughts on this matter any info welcome .
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Reply By: Member - Rosco from way back - Thursday, Jan 03, 2013 at 18:56

Thursday, Jan 03, 2013 at 18:56
I would tend to approach that one with a large measure of caution. Notwithstanding all the noise about upping the ante with this engine (which I personally believe to be unnecessary and possibly disastrous in the event of premature engine failure), I have no doubt it was put there for a sound reason.
AnswerID: 501561

Follow Up By: Ross M - Friday, Jan 04, 2013 at 00:12

Friday, Jan 04, 2013 at 00:12
I agree with Rosco.
I am not familiar with the finer points of the V8 cos I have found Toyota frown on me visiting the dealers and pulling one apart.
From what you have said it is between the airfilter and the airflow sensor, is this correct?
If it is, it is probably there to prevent damage to the airflow sensor and to prevent ingestion of mechanics rags they forgot was in the air intake, if and when the vehicle is started without and aircleaner in place.

It would also tend to break up, to small metered out droplet size, any water which may find it's way into the intake from whatever source.
If fine droplets, rather than big gobs of water, the engine may be able to survive a bit of H2O in the intake.
Also if the droplets are big then that might just cause hydro lock in one or two cylinders, doesn't really matter the engine will be stuffed then anyway.
The gauze breaking up of the water glob might also mean the turbo compressor wheel doesn't get a really big hit on one zone of the wheel and damage the scroll fins. Really fast spinning fins would hit hard and suddenly a bit like you driving into a 20L drum of water at 100km. The only thing which won't get damaged is the water.

If the compressor wheel goes from say a typical 70,000rpm to zilch in a short time the exhaust turbine end is still going like the clappers, I doubt if the turbo shaft/wheels and housing would tolerate the twisting decelleration torque which will happen, something it was NEVER designed to do.

Most likely Toyota did fink a bit about this. You can of course always tear it out and try your luck you might pick up a couple of horsepower.
When Toyota V8 diesels become/are, a dime a dozen, then I might be prepared to experiment without due consideration.
mydmax
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FollowupID: 777771

Follow Up By: fairdingkum - Friday, Jan 04, 2013 at 12:05

Friday, Jan 04, 2013 at 12:05
g.day ross thanks for you input yes mate its between the air filter and air sensor about 6 inches to the left of the sensor inside the hard molded section right where the ringclip holds the flexible section of air box tubing on. Good comments on rags and water entering engine I cant think of any thing else getting past air cleaner if properly sealed with denso tape . I dont remember seeing this in the old 1hz or any other deisal machinery but thats not to say its not there .I have worked previosly as an underground and suface machinery operator in mines for over 25 years and all machinery turbo charged and ran in the worst conditions . But no doubt it has its purpuse and I wont be removing it in a hurry just interested in its purpose as it must have a big affect on air flow as it is so fine. If you have access to one off these vehicles all you have to do is unclip the top of the airbox 4 clips and look down pipe you cant miss it only takes couple of seconds I dont think anyone would mind .I think you will be supprised at what you see .all the best.
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FollowupID: 777815

Reply By: Rangiephil - Friday, Jan 04, 2013 at 21:38

Friday, Jan 04, 2013 at 21:38
The gauze is there to ensure that the sensor in the Mass airflow meter receives a representative sample of the air passing through.
It is there to ensure the MAF is accurate.
Unless there is at least 30CM of straight pipe in front of the MAF , the gauze is necessary for accurate operation.
It has little or nothing to do with debris , water or anything else.
Regards Philip A
AnswerID: 501677

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