Straight through exhaust???

jonnyt · Jul 16, 2012

Has anyone done this on a V8 90? I was going to put the exits, one each side in the quarter panels at the back behind the wheels so two pipes, one from each bank, probably in 70mm stainless.

I've read everything about silencers and I realise that I run the risk - so be it, but I was wondering whether it might be too loud (just got back from the Le Mans Classic and realise how quiet all road cars are).

The threads on here seem to be putting straight throughs on the diesels.

Thanks,

Jon

V8jon · Jul 16, 2012

I tried a straight through on my series 2a V8 and although it sounded awesome it was way too loud on the road,so a made the system myself where the two downpipes join at the back of the gearbox and then a 3" pipe goes from there to to a big stainless back box from an impretza which exits through the rear panel behind the drivers side rear wheel,its still loud but sounds nice now

discool · Jul 16, 2012

U must have a MOT tester as a friend as that would be a 'fail'.

"A silencer in such condition, or of such a type, that the noise emitted from the vehicle is clearly unreasonably above the level expected from a similar vehicle with a standard silencer in average condition."

jonnyt · Jul 16, 2012

Thanks Jon,

I thought that might be the case. I'm tempted to have an exhaust each side (why not make a job as complicated as it possible can be whenever possible is my motto!!) but I think it might be an idea to put it through a central box of some sort, or I suppose a smaller one on either side.

Do you remember how big the box was? What diameter pipe did you use from the headers to the collector - I think I'm going to go 4 into 1 coming down from the each bank and then two pipes from there?

Might make it up with that a silencer in mind and add it later though after a couple of blats!!

Jon

Dr_evil · Jul 16, 2012

If you want it to be loud, an 8" cherry bomb will suffice to complete your silencer requirement without sacrificing much noise

If you want more noise get a cherry bomb extreme

discool · Jul 16, 2012

Is this a cherry bomb part of my Janspeed system.

V8jon · Jul 16, 2012

jonnyt said:
Thanks Jon,

I thought that might be the case. I'm tempted to have an exhaust each side (why not make a job as complicated as it possible can be whenever possible is my motto!!) but I think it might be an idea to put it through a central box of some sort, or I suppose a smaller one on either side.

Do you remember how big the box was? What diameter pipe did you use from the headers to the collector - I think I'm going to go 4 into 1 coming down from the each bank and then two pipes from there?

Might make it up with that a silencer in mind and add it later though after a couple of blats!!

Jon

The frontpipes are standard rangerover but i modified them to fit up tight to the chassis so i dont rip them off when offroad

then the pipe from the y piece is about 3" all the way to the silencer

then the "little" backbox

and this is the result

It's good to be back on the road again - YouTube

Spunka · Jul 16, 2012

tdfive · Jul 16, 2012

Lots of tyre noise there. Nice job.

jonnyt · Jul 16, 2012

Not that bothered about it being very loud - I just don't want to muffle the V8 too much. I've spent a lot of time on the engine itself (9 months and counting) so to do all of that and then restrict the flow by silencing any more than necessary seems a shame. Any ideas what sort of db that set up would give?

Dr_evil · Jul 16, 2012

You can get muffled headers which would then allow you to make a large bore pipe from then onwards

v8hotrodboy · Jul 16, 2012

I run Cherry bombs on my Hot Rod and that sounds great, or you could try these
Supertrapp Disc Only Clamp On Silencers - Demon Tweeks

jonnyt · Jul 17, 2012

What are muffled headers? Will they not restrict flow significantly from the exhaust ports?

Interestingly I took a TVR silencer apart recently (obviously not to weld straight through pipes in and weld it back together) and the silencer was only a piece of perforated pipe surrounded by fibreglass wadding so the flow wasn't restricted but it had a significant effect on sound levels.

Spunka · Jul 17, 2012

v8hotrodboy said:
I run Cherry bombs on my Hot Rod and that sounds great, or you could try these
Supertrapp Disc Only Clamp On Silencers - Demon Tweeks

post some pics of your Rod mate
:beer2:

lorri789 · Jul 17, 2012

Clanger · Jul 17, 2012

Are you thinking of putting a Y pipe in because if not you will power.These engines need some sort of balance pipe from the headers to run correctly.

POAH · Jul 17, 2012

Clanger said:
Are you thinking of putting a Y pipe in because if not you will power.These engines need some sort of balance pipe from the headers to run correctly.

you don't really

v8hotrodboy · Jul 17, 2012

Spunka said:
post some pics of your Rod mate
:beer2:

Goody8 · Jul 17, 2012

Damn nice sir..

v8hotrodboy · Jul 17, 2012

Goody8 said:
Damn nice sir..

Thanks, makes all the hard work worth while.

Straight through exhaust???

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