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15-09-2011, 12:37 PM
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#1 |
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AstinaGT Regular
Join Date: May 2005
Location: Western Australia
Car: BA Astina Turbo
Posts: 299
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Max boost for my bpt?
Hi all, my car gets dynoed tomorrow, it's a stock bpt with a gt2871rs and manifold. Haltec e6x ecu fuel system is beefed up.
Whats the max boost I can run safely? It's a daily driver. I was thinking around 15psi. Any suggestions?
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Peace Out (^_^)|| Paul |
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15-09-2011, 12:39 PM
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#2 |
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Senior Member
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Generally between 16-18psi I think is considered the limit. You should be fine around 15-16 with that decently sized turbo. Just make sure you don't run out of fuel.
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15-09-2011, 01:01 PM
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#3 |
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Administrator
Join Date: Mar 2002
Location: melb.vic.au
Car: AZ-1, Astina Hardtop Turbo, BJ Protege, Beetle
Posts: 16,525
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As much as your tune allows, really. I think the 2871 gets past its efficiency range at over 20psi, and after that you're just making extra heat.
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15-09-2011, 01:04 PM
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#4 |
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AstinaGT Regular
Join Date: May 2005
Location: Western Australia
Car: BA Astina Turbo
Posts: 299
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So 16psi should be ok?
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Peace Out (^_^)|| Paul |
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15-09-2011, 01:27 PM
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#5 |
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Administrator
Join Date: Mar 2002
Location: melb.vic.au
Car: AZ-1, Astina Hardtop Turbo, BJ Protege, Beetle
Posts: 16,525
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As long as your engine can handle it. 16psi on one turbo isn't the same as 16 psi on the stock one.
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jdmparts.rupewrecht.com Sourcing your not-quite-overnight parts from Japan WRECHT--|--SLOWTEGE--|--BEETLE--|--SUBSTITUTE--|--AZ-1 |
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15-09-2011, 01:40 PM
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#6 |
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AstinaGT Regular
Join Date: May 2005
Location: Western Australia
Car: BA Astina Turbo
Posts: 299
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That's my question, can stock internals handle that?
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Peace Out (^_^)|| Paul |
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15-09-2011, 05:16 PM
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#7 |
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Senior Member
 
Join Date: Sep 2004
Location: n/a
Car: n/a
Posts: 10,929
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no. from rough calculations between VJ20 vs GT2871RS is 16psi / 13psi. although you tuner if any good should be able to tell you this.
why such a big turbo for a daily car? it'll never get a chance to spool up. |
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15-09-2011, 05:41 PM
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#8 |
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AstinaGT Regular
Join Date: May 2005
Location: Western Australia
Car: BA Astina Turbo
Posts: 299
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Smaller exhaust housing, will spool up fine. I will have it tuned at 15psi. That will do me
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Peace Out (^_^)|| Paul |
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15-09-2011, 06:26 PM
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#9 |
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Senior Member
Join Date: Sep 2004
Location: n/a
Car: n/a
Posts: 10,929
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how is 64mm smaller than 52.5mm?
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19-09-2011, 11:37 AM
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#10 |
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AstinaGT Regular
Join Date: May 2005
Location: Western Australia
Car: BA Astina Turbo
Posts: 299
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225.5 hp atw at 15 psi boosts great, on full boost by 3400 rpm drive like it's on crack! Could not be happier
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Peace Out (^_^)|| Paul |
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19-09-2011, 01:12 PM
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#11 | |
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HONEYWELL REPRESENT
Join Date: Aug 2005
Location: Salisbury - Inner City
Car: 1997 BA Hardtop - Had a 2003 BJii J48 Sport20, and 2x bg SOHC astina hatches
Posts: 5,011
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Quote:
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19-09-2011, 03:25 PM
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#13 |
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Senior Member
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Stock BPT on 7psi [approx half a BAR] is 138KW at the engine. Mine on 12psi dynoed at 141 wheel HP, but it was setup for a V8 so the amount of power is way wrong. Should be more like 160-170HP at the wheels.
http://en.wikipedia.org/wiki/Mazda_F...2.80.931994.29 |
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19-09-2011, 05:03 PM
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#14 | |
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Senior Member
Join Date: Sep 2004
Location: n/a
Car: n/a
Posts: 10,929
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Quote:
stock would be around 110wkW as you said. Last edited by project.r.racing; 19-09-2011 at 05:06 PM. |
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21-09-2011, 09:37 PM
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#15 |
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AstinaGT Regular
Join Date: May 2005
Location: Western Australia
Car: BA Astina Turbo
Posts: 299
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ill just say its a handfull and i could not be happier
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Peace Out (^_^)|| Paul |
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22-09-2011, 12:02 AM
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#16 | |
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E74A
Join Date: Nov 2004
Location: Sydney
Car: SP20
Posts: 1,248
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Quote:
i thought you LIVED in Syd before ? did you move to W.A. ? Unless im thinking of another white turbo hatch. |
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22-09-2011, 12:03 AM
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#17 | |
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E74A
Join Date: Nov 2004
Location: Sydney
Car: SP20
Posts: 1,248
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Quote:
i thought you lived in SYD before ? did you move to W.A. ? Unless im thinking of another white turbo hatch. . . . Last edited by Noble323; 30-09-2011 at 05:06 PM. Reason: Wrong font |
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22-09-2011, 12:09 AM
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#18 |
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Senior Member
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Mine made 170kw with vf10, fmic, ecu, 3" exhaust, eboost2, and 16psi. Full boost by about 2800
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22-09-2011, 09:35 AM
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#19 |
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Senior Member
Join Date: Oct 2009
Location: NSW
Car: 1998 Toyota Supra 3.0L Twin Turbo
Posts: 1,413
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Stop talkin about it and post acceleration videos and driving videos
 Congrats mate. Very jealous
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 1996 Mazda 323 Astina BA Hatch 1.8L - No Longer Mine 
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08-10-2011, 02:04 AM
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#20 |
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AstinaGT Regular
Join Date: May 2005
Location: Western Australia
Car: BA Astina Turbo
Posts: 299
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i call bull**** 170 kw at 16 psi with a vf10
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Peace Out (^_^)|| Paul |
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