what is the main gain from fitting a turbo down front pipe decat?? ie auzzi ect.... of course better flow but is it more bhp or ft/lb??? and do these engines suffer boost creep??? i had a mitsubishi evo III before and it was a nice bunch of torque that it gained but did also suffer boost creep.... what extra has been seen?? 10+bhp??

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ST185 266BHP/257FTLB

Typically an improvement in both but you need to up the boost pressure to see the best results.

Downpipes can often result in boost creep this can sometimes be solved by porting the wastegate or getting a turbo with a different design of wastegate, porting is not really a DIY job.

You can also fit a restrictor ring but that is quite a compromised setup.

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GT4DC Events Co-ordinator
1996 ST205 UK

would it be a noticable gain other than louder?? and do they run richer?? evos run richer when u fit a full system

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ST185 266BHP/257FTLB

A bit louder, but a fair bit 'deeper' sound.
I found my CS to suffer from creep mostly with lower temps. A restrictor is easily made by using a piece of sheet metal with a small opening in it as a gasket.

Another advantage is the loss of almost 10 kg and of course a bit more room in the engine bay.

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René - Carlos Sainz 2433•5000
Turbocelica.nl | ST185 CS restoration and full rebuild

If it ain't broken.. it soon will be

My ST205 certainly ran richer with a 3" downpipe and front pipe feeding into a 2.5" Blitz Nur Spec R system. Even removing the rear baffle also affected the fuelling, probably due to the change in back pressure? I had a Dastek Unichip maxed out to remove fuel before I fitted a MoTeC M4 Pro to do the job properly.

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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