You've had schooling hey , nice exhaust too ,no Milo can hanging off the back ,
Mudski I'm told Jack Daniel cans are fine to wash down meds, I'll sleep right through but wake way too early, 5.30- 6 always have
There must be a formula or such to work these things out its not just ,whack a 3" system on and alls good, Who wrote the back pressure book??
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
School? No mate, more like the trial and error. Talking to old school racing mechanics helps too! And thats 304ss i like the way it rattles lol
Kinda doesnt make sense there. Air should be going in and out at the same speed regardless of the power range.
I tapped that app...
No intake is cold so its dense, the air particles are closer together air going out is hot so the particles are spread out. Now thick of your exhaust as a garden hose, if its really thin it comes out with heaps of pressure but not that much in volume say like 5mm, if its too big like 20mm it comes out with no pressure but alot comes out BUT in between say 12mm you get good pressure with a good amount of water flowing it from it. Hope that makes sense its alot easier to explain verbally lolOriginally Posted by mudski
Agreed, gasses flow faster when hot. You want to keep them flowing fast and staying hot, too big a pipe allows them to cool down and slow down.
Power up high isn't much good if you're losing bottom end. I made a few sets of headers for an old 4by of mine, first set made high end power, third set lost a tiny bit of top end but made an awesome change to low-mid range torque by having smaller secondary pipes.
GUIII ZD30 Manual Wagon, OME 2" lift, 33" BFG AT's, Snorkel, Chip, 3" Redback Exh, Dual Batts, etc.
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Maybe on a N/A engine but ib a turbo charged engine the hot gases are forced out anyhow so bigger pipe wont matter IMHO.
Plus gases do flow faster when hot but not as fast as cool air through the same sized area its flowing through.
I tapped that app...
Last edited by mudski; 20th January 2013 at 10:35 AM.
It's not the flow that changes. The air flows in and out the same.
It's the expansions of the gasses changes, thus why exhausts are larger than intakes..
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Kallen Westbrook
Sorry, I did mean to mention that. Forced induction cars are a different story.
Exhaust valves are larger for scavenging.
GUIII ZD30 Manual Wagon, OME 2" lift, 33" BFG AT's, Snorkel, Chip, 3" Redback Exh, Dual Batts, etc.
KEEP OUR TRACKS LITTER FREE!
Induction system doesn't matter still the same principal for a combustion engine " Suck, Squeeze, Bang, Blow" its finding what size exhaust has the right air speed to suit your needs
so the answer to my question I suppose after all that is I dont need it?
2002 3L GU Patrol, 2" lift, 33's, snorkel, dual battery, sliders, DVD, bluetooth
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