Anyone built a sports exhaust?

[red vtec]

My standard exhaust is pitted on the outer cover and therefore needs replacing as it's an MOT failure. I remeber someone on here re-skinned there exhaust. I have someone who can do this for me. I have been reading up on exhaust and for a Turbo car I understand it to be that the bigger the pipe the quicker you can get the gasses away. If I rip the exhaust apart and place a staright pipe through the silencer and repack with sound deadning, will it work? i.e give a bit more performance.

[chris]

I had a powerflow place make me a custom system. They made up three different versions with varying silencers and pipework to get the look, flow and sound just right plus any style of exit from round to triangular from single exit or dual. Total cost

[Bibs]

http://www.thelotusforums.com/wiki/index.php?title=Exhaust_Options

[red vtec]

Cheers,

I will get the box off and rip it apart and have a look.

[Bibs]

There are some good aftermarket options and in fairness, they aren't that expensive for what you're getting.

[red vtec]

Yep true, I'll have a read up as you say might be just as easy to bolt an aftermarket on. I do like the twin tail pipes, but that means modding the bumper.

Chap OI know has just fitted a TUBI to his F360 looks and sounds nice

[Dave Freeman]

Hi Chris, yep I have a powerflow exhaust, all made up on the car cir

[richardvg]

Hi guys

remember that a stainless steel exhaust retains heat for longer !

i would recommend the silencer in stainless and the balance in mild steel - there is a big difference in the heat exposure.

richard

[Bibs]

The hotter the exhaust is, the hotter the gases inside it and the quicker they leave the system. It's not a bad thing!

[Jonathan]

I have been reading up on exhaust and for a Turbo car I understand it to be that the bigger the pipe the quicker you can get the gasses away.

Not really I'm affraid.

People commonly mess exhaust theory up with gas dynamics, not the same, exhausts are a series of gas pulses with pressure fronts and so on.

Think of them like bullets in a machine gun barrel, if you open the barrel up the bullets will start to wonder about and eventually turbulate and hit each other making them less effective at exiting the exhaust.

Read this excellent article :

http://www.team-integra.net/sections/articles/showArticle.asp?ArticleID=47

By having a cabage shooter on the back you can actually inhibit the gas flow by causing turbulant flow, backfire and post detonation (causing back pressure).

What you want is a tuned pipe for the car or one thats short so the gasses stay hot longer and can exit asap.

Look at the pipe leading to the turbine housing, what diameter is that ? Not a lot, no where near the size of some people's post turbo systems which gives you an idea - bigger is not better in this case.

The biggest issue imo is the fact if you have a turbulant or poor post turbo setup you'll ruin a lot more power becuase you're affecting the flow between the turbine which produces 70% of your power.

End of the day though it's your money your choice.

You could always do what I did on my GT2 which was remove the whole system post turbo and come straight out of the down pipe into a small silencer where the CAT used to be and then out using the same pipe diameter as the feed to the turbo.

Really easy, it has only 2 joins cost about £100 to DIY, non welded, saves tons of weight and that should cause the least pressure drop and the most flow vs un-earthly noise, its loud but not outragously loud.

Edited November 16, 2009 by Jonathan

[superdavelotus]

Hi Chris,

I've just listed a S300 type ligther weight sports exhaust on my site. It has the smaller silencer and it's a big bore. Sounds nice too!

Regards,

David Walters

[mangel]

Mines a powerflow twin centre exit with the V8 Cheese grater and no Cat. Sounds great and I've painted it all VHT satin black so it looks cool too (not a big polished stainless fan)

[Bibs]

We'll be listing the entire Quicksilver range in our shop in a day or two

[mr.oogieboogie]

i will be picking up my stainless cat on saturday made a little longer due to the ebv being removed cost

[sailorbob]

i will be picking up my stainless cat on saturday made a little longer due to the ebv being removed cost

[mr.oogieboogie]

hello Derek, thats no problem send me a pm and i will give you directions, i should be home on Saturday from 10am all day as having carpets fitted

[Jonathan]

Silly question, why did you have a CAT made ?

My SE has a small stainless silencer where the CAT used to be which was only

[mr.oogieboogie]

the car is a 1993 so it requires a cat, i have had it decatted for the last 10 or 11 months the cat that came off it is in reasonable condition but the three holed bracket had rusted badley so i decatted it (flame on) but have chosen to have a replacement made also to get rid of the spacer washer where the epv was, so i will be sticking the cat bypass and spacer up for sale when i get some time, may also leave in the o2 sensor which has only done a couple of hundered miles

[sailorbob]

Thanks Peter, I think your pm box is full because I keep getting a 'The member cannot receive any new messages' error. Could you pm me an e-mail address?

[mr.oogieboogie]

hello Derek, i have taken sokme pm's out of my inbox, however i have tried to pm you, but looks like yours is full also

[sailorbob]

Yep, it looks like the number of messages you can have was halved when the forum changed. PM sent.

[mr.oogieboogie]

hello everyone. well i picked up the new s/s cat and the cost was £280 dead. whilst i was there i had a look around some of the jigs they have for the testorossa'a aston etc when i dropped of the cat they were fitting manifolds they had made onto an old lagonda sports convertable (worth about £95k) great looking car also spoke to them about the rear section (mine has the stainless sj's sports box on) but im thinking on changing it. i will put a pic up later as just got back from shopping

Edited November 20, 2009 by mr.oogieboogie

[mr.oogieboogie]

hello everyone. sorry for the late pic of the stainless cat, Greg (sailorbob) good to see you today sorry about the mess, bloody carpet fitters.

the firm that made it are stainless exhaust specialist tel 01623 552262 0r email:- sales@stainless-exhaust.com web address www.stainless-exhaust.com

all the best

Edited November 21, 2009 by mr.oogieboogie

[lotus4s]

Nice looking piece.

[sailorbob]

It's quite a weight saving over the original.