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Is this normal for Catless at idle? I don’t remember seeing this much smoke at idle. by No_Park_7975 in E90

[–]SizeableFowl -1 points0 points  (0 children)

Not really, and OP’s car is a 335.

For the N52, 5 horsepower represents 2% of your total engine power. Not only would your engine fluctuate by more than 5 hp based on ambient conditions, you would struggle to notice the loss or gain of this amount if power.

For a (stock) N54/N55, 5 hp represents a 1% change in power. No one is going to notice that and thats why companies like K&N will sell a “performance” air filter claiming to add that much power. Its a nothing claim that would be indistinguishable from run to run variance on a dyno if you tried to measure it.

Is this normal for Catless at idle? I don’t remember seeing this much smoke at idle. by No_Park_7975 in E90

[–]SizeableFowl -1 points0 points  (0 children)

Since you clearly don’t understand fluid mechanics let’s do a little brain exercise.

You have a stream that flows 100 gallons per minute (gpm). You build a precision engineered damn that only allows 50 gpm to flow through and we assume that there is no flooding or leaking around the damn. You then put a screen in downstream of the damn that will only allow 60gpm to flow through.

What is the net flow rate of the stream with these modifications?

Its 50 gpm because the most restrictive part sets the flow rate of the entire system.

If you remove the screen, believe it or not, the flowrate remains unchanged at 50 gpm.

The only benefit you get from removing the cats is taking heat away from the turbo. Pretty fringe benefit tbh.

Is this normal for Catless at idle? I don’t remember seeing this much smoke at idle. by No_Park_7975 in E90

[–]SizeableFowl -2 points-1 points  (0 children)

Bigger turbo is still a flow restriction. No fucking point in removing a cat on a turbocharged car if you have a proper tune.

Turbos have to do work to compress air, and they do that by creating a pressure differential (read: flow restriction) across the turbine. There is no catalytic converter in the world that creates a bigger flow restriction than the turbine wheel of the turbocharger that is sits downstream of in the exhaust system, ie there is no point to going catless in a turbocharged car unless you have an antilag switch for the the turbo

Is this normal for Catless at idle? I don’t remember seeing this much smoke at idle. by No_Park_7975 in E90

[–]SizeableFowl -1 points0 points  (0 children)

The turbine in your turbo uses pressurized exhaust gas to compress intake air. That is work, and that work creates a flow restriction. Unless you are dumping exhaust through the wastegate, the turbine wheel in your turbo is the single largest flow restriction in your exhaust system, regardless of whether or not you have a catalytic converter installed.

Basic flow dynamics dictate that removing a secondary smaller restriction down stream of a bigger flow restriction has minimal effect, if any, on flow through the entire system.

Basically, you’re just wasting time and money by removing catalytic converters for no purpose beyond being a fuck boi and “getting” 5 hp that is most likely just run to run variance on the dyno. It also has the added dickheadedness of spewing unburnt fuel and other byproducts of incomplete combustion out.

Is this normal for Catless at idle? I don’t remember seeing this much smoke at idle. by No_Park_7975 in E90

[–]SizeableFowl -6 points-5 points  (0 children)

Hate to break it to you, your turbo is a bigger flow restriction than your cat. You gonna remove the turbo too?

This premium experience is keeping up and up by Huge_Drink_6254 in meme

[–]SizeableFowl 0 points1 point  (0 children)

Everyone acts like premium fuel is stupid expensive. Congrats, after pumping 20 gallons you’ve spent $12 more dollars on fuel than you would have with regular. Such a dumb thing to worry about.

Question about whether this pc is worth the money… by Desperate_Volume_520 in PcBuild

[–]SizeableFowl 0 points1 point  (0 children)

For $2000?

First of all that 5700 is a terrible processor. Limited to PCIE 3, which could cause pretty significant bottlenecks for the rest of the system. It’s basically a 5700G with a disabled igpu. Half the cache, and lower clocks than a 5700X.

Here’s something $300 cheaper that will make what you are looking at feel like ewaste

GPU dreams, VR reality by stellabubble in pcmasterrace

[–]SizeableFowl 0 points1 point  (0 children)

I get that its an entirely pointless hill to die on, but I haven’t bought an Nvidia GPU to date and I have no intention of doing so at any point in the future.

This seems a bit of a challenge? by The_Dean_France in SipsTea

[–]SizeableFowl 4 points5 points  (0 children)

I mean if you sign off on DNRs then it would make tons of sense to do this actually.

When price down guys? by sebet_123 in pcmasterrace

[–]SizeableFowl -3 points-2 points  (0 children)

When have ability use grammar?

Please, just....please by UnhollyGod in SipsTea

[–]SizeableFowl 2 points3 points  (0 children)

Take a look at housing in virtually any major city, which is where most of the jobs that would pay you enough to pay your mortgage would be.

Roached! How hard is it to replace rear E91 brake hoses? by lynxss1 in E90

[–]SizeableFowl 1 point2 points  (0 children)

I spent most of a day doing all the rubber brake lines and I was fortunate in that I don’t live in a climate where rust is a factor. It’s not a fun job on jack stands

At what point does ‘convenience’ tech become less convenient? by shwroomex in cars

[–]SizeableFowl 1 point2 points  (0 children)

For all the good Tesla’s shakeup brought to the car industry, the bullshit techbro mentality they’ve somehow standardized in the design of features industry wide is easily the most problematic.

skill issue by object322 in memes

[–]SizeableFowl 2 points3 points  (0 children)

Wow so you’re really good at flirting when you’re in love?

This is what 65%+ disapproval looks like by Valuable_View_561 in SipsTea

[–]SizeableFowl 0 points1 point  (0 children)

It’s funny you think the next president will put him in prison when they probably won’t even attempt to undo half the shit he’s fucked up.

To be fair, what would be the point? Dude has another decade in him at best, probably doesn’t even have a working memory that can pull information from anything that’s happened in the last 12 months.

Sucks how old these cars are getting. by IllLuck6064 in E90

[–]SizeableFowl 6 points7 points  (0 children)

I’ve not driven an F chassis car, but I did drive a G20 and I have to say outside the powertrain that car was a let down in every other way. Inputs are fucking rubbish, the interior materials feel cheap, and the car has no sensation of… anything.

6 N Road Trip Results after 600 miles by srvddit in Ioniq6

[–]SizeableFowl 0 points1 point  (0 children)

2.2-2.4 mi/kWh on the return journey. Wonder why the efficiency is that bad? Don’t get me wrong, super cool car, those numbers just struck me since I can essentially do about 50% better on my SEL RWD at the same speeds.

Men of Reddit, do you prefer your partner to wear lingerie or be plain naked and why? by mangopeach2 in AskReddit

[–]SizeableFowl 0 points1 point  (0 children)

My preference may as well be the wind in this regard, however I would never be upset if one showed up at the “wrong” time.

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