Right guys

Just planning ahead so...

Where is the best place to exit a screamer pipe . Is it best to release to atmosphere under the car or allow the pipe to rejoin the main exhaust system. Whats most efficient???

Also any mot issues

_________________
1995 ST205

it will fail the MOT because you are releasing raw exhaust gasses. when i ordered my TD06 i specified a recirc screamer for the additional benefit of not deafening everyone when you go on boost

the "best" solution for outright power (ie minimal gas restriction) is to leave it open to atmosphere.

_________________
Sprint ST165 aka "The 500BHP Sledgehammer" #6 in the Toyota Sprint Series. GT3071 1.9bar

I would agree with Andy

Whilst it may sounds great to have an open screamer it would probably become very tiring to drive?

Also if you have the screamer venting to atmos then where is the exit going to be? The last thing you want is to start melting stuff, be breathing in nasty stuff!

Back into the exhaust would be my preferred option I think

_________________
Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement

Yeah

This is my initial thought although i didnt want to cause disruption of the airflow via turbulance.

The option was to release under the car, via a side exit behind the pasanger front wheel or via a seperate pipe to the rear of the car.

Would turbulance cause such an issue if the pipe was joined arount the flexi are (although im planning to put my cat here).

Mat

_________________
1995 ST205

Mat, I don't think turbulence is an issue if you design the waste gate exhaust to merge into the pipe at a streamlined angle. The pics below of the Toyota 503E race engine shows the sort of design they came up with for their external wastegate and exhaust. I'm sure if this lost power they'd have opted for an open 'screamer' configuration.

As a matter of interest this car completely dominated the IMSA-GTP Championship in the early 90's so if its good enough for them then its good enough for me!

The only thing I'd change would be to put a flexi section in the wastegate exhaust as the temperature range you'll see on a road/track car application are likely to be far greater than a race car.

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

I also think that with a screamer pipe you'd have real problems at trackdays with meeting the noise requirements. best to do a recirculating IMO.

_________________
GT4DC Events Co-ordinator
1996 ST205 UK

Go with what your heart say's mate i have a screamer pipe going straight down to the floor in the engine bay and had it mot'd yesterday so no issues with that.The pipe is wrapped so no heat problems either,TBH it's not that loud as most of the exhaust gases are going through the turbo @ 1.7 bar anyway.
When sonic is on boost it's brill
wouldn't change it now for the world lets face it how offen do you go to the track.Not worried about the noise because it's not until you are on boost that the noise becomes an issue.
Have you heard cars with them daft restrictor baffle,they are mega loud when on boost.
Hutch

_________________
Please take your nails out of my dash..........501.1 Whp

ive been on a few trackdays with my screamer pipe now and had no probs with noise.
static noise tests r not a problem as there is no boost, so no noise from the screamer and ive not been pulled up by the drive-by tests.
i was only running low boost (1.2 bar), not sure if i would pass the drive-by at 1.5 bar, cuz that does seem a little louder.

my screamer pipe comes straight down from my Tial wastegate and ive had a small bend fitted at the end. all heat wrapped and sounds great

it also passed the MOT no probs a few weeks ago with it fitted.

_________________
ST205 WRC