munna

was at work yesterday...and kind of got drawing...(You know doodles!)and i drew a snake!..then a thought how about transplanting this snake to the exhaust system of the car...

So here goes....any ideas on how the car will sound and perform without its down pipe cat and a boxless backbox?

So in essense all i will have is one peice of winding stainless steel snake under my car!!

Moonloops

It would probably sound like a tractor!

SwissTony

iTrader: (19)

and hiss a lot

Moonloops

Depends on the fuel addertives I guess

andythejock01wrx

Piggin' loud !

munna

so a big no no then?...when i mean boxless by the way i mean no back box what so ever!!just the pipe at the end of the car!!

please be honest..will it sound stupid and really like a tractor?and will i kook like a complete K**** when climbing out of the car?(No I am Not a midget!!)

speedking

1. If you're not going to have any boxes then you don't need the pipe. Do away with that extra weight and all the hangers etc. and just terminate below the engine somewhere.

2. There is more to exhaust design than just getting the gas to the back of the car. IIRC some back pressure is necessary for the engine to run.

munna

thankyou

i think i might need to spend a little more time on this!..asuming that i get rid of the pipes all together i take it that the car will run like a dog ie cr*p!!
so i will lose some of the back pressure?hence i will some sort of length in order for pressure build up?

totally lost!!and stupid!!(Me that is)

philrsi

Sound like a dragster and you'd be constantly pulled by the police for exceeding noise limits.

munna

splendid...i will get it done this weekend...any thing to get stopped by the police!!!...well having thought about it...the down pipe cat will get left in...and the HKS will come off!!..i just want to hear what she sounds like!

i will try to get some pics and sounds or vids up for to see and hear....

hades

Backpressure, pulse resonances / extraction, gas speed and all that sort of stuff are key to exhaust design on NA cars and before the turbo on turbo cars. After the turbo, you want the smallest amount of backpressure possible at the expected flowrates. This doesn't necessarily mean a virtually straight pipe, managing the gas flows, speeds etc particularly around the turbo outlet are all key issues. I can't pretend to be an expert - I just know enough that I have a fair idea of the issues I don't fully understand, if you see what I mean!

As for a "boxless" backbox, go ahead, fit a straight pipe, and strip out your soundproofing - it's all unnecessary weight. Then drive 200 miles to a suitable hospital and see if they can save your hearing. It's been done before with a very small "bean can" resonator; IIRC the noise levels were something like 120db(A) at moderate revs, to put it in context that is well over 30 times louder than the mandatory limit in industry where you must wear hearing protection.

Don't quote me, but I seem to remember Knowlesy, now of Xtreme scoobies, mentioning he'd run one of these bean can devices for a very short time and ended up with some very annoyed neighbours and a legal "request" to fit a quieter one asap.

911

To be honest a rediculous (sp) idea for a road car.
Hades sums it up very well imho.
Fit a free flowing big pipe system but to run open pipe is begging for trouble from everyone.

Graham

T5OLF

iTrader: (4)

You mean one of these

eBay.co.uk: IMPREZA DRAG EXHAUST ROGER CLARK 3" STRAIGHT THROUGH (item 170087726668 end time 11-Mar-07 16:40:30 GMT)

911

Yep. One on the Ice Car.

munna

wow...that was loud...see this is what i have been missing all of these years..some genuin help from genuine enthusiasts who help out idiots like me!!!

dude remember if that spoiler sale falls through...i am your man!!

vindaloo

Having driven my P1 back from Thruxton with the backbox section separated from the rest of the exhaust (it broke, rust etc), I can say it'll sound LOUD. The sound resembled a V1, though it probably wasn't quite as loud.

J.

munna

ok posts like that make me want to do it...just for the sake of neing able to listen to her howl!!...i suppose it not going to cost me much to find out!!look at us...saturday night...and what are we doing?...bloody on our computers on scoobynet!!!ha ha ha ...