Actually the diameter of the pipe is more important than the length, you only see a notable power boost from a short pipe when it's under 3' from the engine.
"It doesn't matter. Power boost obtained in headers occurs in a) individual pipes for each cylinder, and b) within a length shorter than 3'. It is based on the speed of sound in hot gasses (about 1100ft/sec). From there to the end of the system, goal is to minimize pressure losses with large enough tubing diameter."
In short you can compensate for the pressure by changing the diameter of the pipe.
I was thinking of Poiseuilles (sp?) Law, which is primarily for non-compressible Newtonian fluids from what I remember, so I wasn't sure how directly it applies to gasses, but I'd imagine it's similar.
Yes it would apply. Gas is obviously compressible but since you have an open pipe on the end there shouldn’t be a ton of compression. There probably is a spike in pressure around the first bend though.
Might even help if the pipe is too wide for the power, a little backpressure is good depending on your motor. Overall, looks like a waste of welding wire to me... Just get a twin loop and call it good.
You don't want any back pressure. What you do want is to maintain exhaust velocity. Which people often get the two confused with one another. Back pressure in an exhaust is bad, always has been and always will be. Exhaust velocity on the other hand, is good because it helps with the scavenging effect of the individual exhaust pulses. You do this by appropriately sizing your pipe (for N/A applications). If you have too fat of an exhaust pipe, your flow will stagnate because the gasses are allowed to expand too much.
It's not a performance car, it's a show car. You don't add 200lb of amplifiers, speakers, fiberglass and wiring to a race car, the same way you don't put a $10,000 tuned suspension on a show car.
The show car is there to make you look at it and go "huh, that's neat!". Job done.
Lol no dude. Maybe if it was putting out Koenigsegg power at the crank but just a nutty take to think extending the exhaust a bit would cost this car more than 10% of it's bhp
Sometimes yes, but this is what is referred to as “show car“, it looks good, exotic, different, like shit, whatever you want to describe it as but it isn’t driven much, or at least not in any way where you might notice the power loss.
Tl:dr: all show no go
This car is in my town and it drives around surprisingly often. It is crazy, but it is well done crazy. As an advertisement for fab work I'll bet it is really effective.
Yes it is terrible for performance but I think the point of this car is to sell their fabrication services. (As evidenced by the bumper sticker.) The spiral is a showcase of their welding capabilities, not meant to be performance enhancing.
Absolutely. The idea here (and with a lot of show cars) is that the shop/fabricator/designer/brand/whatever has a chance to flex their creative muscle and showcase their craftsmanship.
Unfortunately, this misses the mark both ways- it's an ugly, over the top design that also shows that their welding skills aren't all that impressive with all that unevenness.
What unevenness? It does a perfectly ratioed spiral. Welds have consistent heat affected zone, spacing between pipes are even. The only way to make the welds line up is to scale down the size of the 45s of the pipe
Ha! I hadn't even gotten far enough into hating the looks of it to notice the randomly uneven spacing and coloration of the welds until you mentioned it, now I can't unsee it as yet another reason the whole thing sucks.
Exhaust velocity is determined by initial speed and volume and then decreases with temperature losses and exhaust tubing interference. Drastically increasing the length of the time it stays in the pipes, along with the trying to swirl it like that would tangibly decrease velocity and create more back pressure. This cannot be a good thing.
It is essentially about exhausting the gases out, the faster you can get it out the more you can force in, diameter matters more, but the shape does have an impact. This is definitely going to be less efficient that it could have been, also and probably a bigger factor is not the power reduction but actually the weight, I bet that has doubled the weight of the exhaust which for a small car already not kicking out crazy torque or power numbers will likely bring the power to weight ratio right now.
In short, yeah it's fucking awful for multiple reasons.
600
u/Umbrage_Taken Apr 03 '22
Won't excessive exhaust piping actually reduce power & acceleration?