Cars, motorcycles, and other things that move

Jim C

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Back-of-the-envelope, without knowing where the pilot ejected, how fast the plane was going, the prevailing winds, or whether he landed in North Charleston or just in a nearby area, this is what I've got:

The shortest distance from North Charleston to the lakes is 20 miles and the longest distance is 60 miles.

If he was supersonic when he bailed (ouch!) that's 1-3 minutes. Ages in fighter pilot reflex time, but who knows what he was dealing with. Maybe he sent it into the water on purpose. But then how did he come down so far away?

But that's why I shared--I thought it was interesting.
I think he shit himself and freaked out.
That was a quick good bye to $100M.
Pretty sure the plane was flying on autopilot for awhile without a pilot.
 

mktrat

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So....got some less than fabulous news last night. The "aftermarket" exhaust that was supposedly on my Audi? Yeah, it's literally "just the tip(s)". Must have wanted to start there to see how they felt about it....

Anyway, I'm gonna make some lemonade here. Any thoughts on an new exhaust setup? Cat delete? Hi flow? Resonator? X-pipes? True duals?
I don't want to be obnoxiously loud, and I would prefer to avoid droning at speed.

QC? Anybody seen QC?
@4strings
 
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Jim C

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So....got some less than fabulous news last night. The "aftermarket" exhaust that was supposedly on my Audi? Yeah, it's literally "just the tip(s)". Must have wanted to start there to see how they felt about it....

Anyway, I'm gonna make some lemonade here. Any thoughts on an new exhaust setup? Cat delete? Hi flow? Resonator? X-pipes? True duals?
I don't want to be obnoxiously loud, but I would prefer to avoid droning at speed.

QC? Anybody seen QC?
@4strings
Are you positive that an aftermarket exhaust on a hi tech car like an Audi, is really going to make more power?
The drone with an auto trans makes me crazy.
 

mktrat

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I used to be the first one to ditch cats, but now cars make 750 hp with them, so I dont bother anymore... its not worth the agg
The problem I'm wrestling with isn't so much the true deletion versus possible relocation. On these cars the cats are right next to the motor. Heat buildup can and will cause premature failure. It's pretty common.
 

armyadarkness

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The problem I'm wrestling with isn't so much the true deletion versus possible relocation. On these cars the cats are right next to the motor. Heat buildup can and will cause premature failure. It's pretty common.
well, FWIW, I used to take them off, hollow them out, weld a straight pipe through them, then use O2 simms.

But if I were going to move them, I'd just get smaller, better, aftermarket units
 

mktrat

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well, FWIW, I used to take them off, hollow them out, weld a straight pipe through them, then use O2 simms.

But if I were going to move them, I'd just get smaller, better, aftermarket units

Just as an example. I'm not set on any particular option at this point.
I do want to stick with a bolt on, DIY driveway install.
 

Jim C

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well, FWIW, I used to take them off, hollow them out, weld a straight pipe through them, then use O2 simms.

But if I were going to move them, I'd just get smaller, better, aftermarket units
What's an 02 simms?
I can't believe that you can delete the cats on a modern car without a check engine light / other issue, and very doubtful it would pass emissions testing (at least here in MD).
 

Jared

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Depending on how old your car is, I’d be hesitant of doing anything from the cat forward. Mufflers are at the back bumper on the Audi? Maybe swap those out and call it a day. Rough part about making a newer daily driver loud is most seem to drone right where highway cruising RPM happens. This can usually be helped by adding a resonator to the mix.
 

4strings

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So....got some less than fabulous news last night. The "aftermarket" exhaust that was supposedly on my Audi? Yeah, it's literally "just the tip(s)". Must have wanted to start there to see how they felt about it....

Anyway, I'm gonna make some lemonade here. Any thoughts on an new exhaust setup? Cat delete? Hi flow? Resonator? X-pipes? True duals?
I don't want to be obnoxiously loud, and I would prefer to avoid droning at speed.

QC? Anybody seen QC?
@4strings
WHO???
 

4strings

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Any exhaust mods I've ever done that were actually useful (for performance gains) was just swapping stock, restrictive cats for high flow, lower cell count cats. That's usually a requirement to bump to a higher state of tune (i.e., "going stage 2" for things like APR, Cobb, EQT, etc).

High flow mufflers are usually just fun noisemakers.
 

armyadarkness

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What's an 02 simms?
I can't believe that you can delete the cats on a modern car without a check engine light / other issue, and very doubtful it would pass emissions testing (at least here in MD).
So, obviously the O2 sensors are reading the air/ fuel and then sending an electronic representation of that to the ECM, to be decoded.

For ease of explanation, lets say that the optimum air fuel ratio, 14.7 to 1, is represented by a value of 1 volt.

With simms (simulators) you delete the O2 sensor and then plug the simm into the vehicles O2 plug on the wiring harness. The simm sends out a 1 volt signal, at all times, so the ECM assumes that the car is running perfectly.

Would it pass inspection... yes and no. It would/ could/ does... however, if an inspector was a psycho, he'd be able to watch it in real time and see that the value never changed... that would be an exception, I think
 

mktrat

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Depending on how old your car is, I’d be hesitant of doing anything from the cat forward. Mufflers are at the back bumper on the Audi? Maybe swap those out and call it a day. Rough part about making a newer daily driver loud is most seem to drone right where highway cruising RPM happens. This can usually be helped by adding a resonator to the mix.
2016, no rust issues, not a daily. Also, forward of the cat is only headers. They literally bolt right to them.
 

mktrat

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