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StockR
PostPosted: Fri Jul 01, 2005 1:27 am 
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T28 Hybrid

Joined: Sat Jun 11, 2005 5:30 pm
Posts: 75
Location: near Wollongong
Car: S15
Hi,
Im just wondering if anyone can post up the flow and efficiency maps for a Garrett t28 ball bearing turbo.

Am I right in saying they're not much good above 18psi?
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DumHed
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PostPosted: Fri Jul 01, 2005 9:36 am 
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Takumi
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Joined: Fri Feb 01, 2002 11:00 am
Posts: 4779
Location: building!
Car: Silvia
they won't be much good at 18psi on an SR20 at high rpm...

They can make more boost at lower revs, or more boost on a smaller engine.

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DREAMD
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PostPosted: Fri Jul 01, 2005 1:33 pm 
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TO4

Joined: Fri Apr 29, 2005 5:59 pm
Posts: 243
Location: Blacktown, NSW
Car: 180sx
my T28 was running 22psi fine, didnt start to spool till about 3200rpm and hit full boost at just after 5000rpm

although now im only running 15psi it does seem alot more smoother boost

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dcoghlan
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PostPosted: Fri Jul 01, 2005 3:01 pm 
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T04 Hybrid
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Joined: Thu Jun 13, 2002 9:32 am
Posts: 298
Location: Sydney
DREAMD wrote:
my T28 was running 22psi fine, didnt start to spool till about 3200rpm and hit full boost at just after 5000rpm

I think your taking about a different turbo mate, my standard S15 T28 is on full boost 17psi at about 3000-3100rpm
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Allan GTI-R
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PostPosted: Fri Jul 01, 2005 4:06 pm 
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T28

Joined: Sun Mar 24, 2002 11:00 am
Posts: 36
he'd be talking about a GT28 :)
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StockR
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PostPosted: Sun Jul 03, 2005 12:59 am 
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T28 Hybrid

Joined: Sat Jun 11, 2005 5:30 pm
Posts: 75
Location: near Wollongong
Car: S15
Allan GTI-R wrote:
he'd be talking about a GT28 :)

That's right :wink:
Same as whats on my S15 and my brother's mitsu engine.

I know at what rev range boost come on, drivability etc but need to know if it would be capable or counter productive to increase boost above 18psi.
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