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anto300zx
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Posted: Wed Dec 05, 2012 10:00 pm |
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Joined: Thu Oct 25, 2012 11:35 am Posts: 6
Car Model: None
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well iv recently got my self an st205 to replace my mr2 rev 3 turbo which had a 3ince system and i put a berk 3 inch down pipe and im planing to do the same with the gt4 but what this car has a mongoose 2.5 inch system and there seems to be alot of back presure from it when on boost now im just wondering if it would be a bit of a restriction being 2.5 and not 3 inch and would it be worth changing to a 3 inch system ?
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Sirius
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Posted: Wed Dec 05, 2012 10:30 pm |
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Club Staff |
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Joined: Wed Jul 13, 2005 12:14 am Posts: 3265 Location: Camberley, Surrey
Car Model: ST205
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What other modifications do you have?
Highly unlikely that the 2.5 is causing any restriction unless your running significantly higher power than standard.
_________________ GT4DC Events Co-ordinator 1996 ST205 UK
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anto300zx
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Posted: Wed Dec 05, 2012 10:56 pm |
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Joined: Thu Oct 25, 2012 11:35 am Posts: 6
Car Model: None
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i have a k@n panel filter and the boost up tp 1.1 thats pritty much it !
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TrackToyFour
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Posted: Wed Dec 05, 2012 11:15 pm |
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Club Staff |
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Joined: Wed Jul 13, 2005 12:06 am Posts: 4743 Location: Perth, Western Australia
Car Model: ST205
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From experience if you replace the cat and front exhaust section (including the flexi) with a 3inch downpipe and front pipe then mate it to a 2.5inch centre and back section this would handle up to 330bhp @ 1.2-1.5bar. The larger diameter at the turbo exit has a greater beneficial effect on engine response than a large diameter centre and back section.
_________________ 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
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anto300zx
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Posted: Thu Dec 06, 2012 8:55 pm |
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New Poster |
Joined: Thu Oct 25, 2012 11:35 am Posts: 6
Car Model: None
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cheers lads il just stick with what i have so and get the berk down pipe.cheers for the inputs dudes !
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