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931Owner
Joined: 14 Feb 2009
Posts: 352
Location: Chicago NW Suburbs
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 Posted: Fri Apr 02, 2010 2:04 pm Post subject: Key differences between a US spec 931 and a ROW 924 turbo? |
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I've read a lot but can't really put my finger on why the 931 makes 150 hp and the ROW with 170 hp.
Timing seems an obvious difference but what else was there?
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1980 Turbo
-too many cars and too many motobikes |
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924guy
Joined: 29 Dec 2003
Posts: 2088
Location: Port St. Lucie, FL
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| Posted: Fri Apr 02, 2010 10:27 pm Post subject: |
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half a point compression increase in the row cars, slightly different pistons.
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Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha |
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Nein37
Joined: 29 Dec 2009
Posts: 513
Location: New London, CT
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| Posted: Fri Apr 02, 2010 11:37 pm Post subject: |
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Mostly due to stock boost levels. S2 Specs:
US cars run 7 psi or .5 BAR 156hp
Euro cars run 10 psi or in Euro speak .65 BAR 177hp
Put a boost gauge and a manual boost controller in your US car, turn it up to 10 psi and enjoy. You'll need to run on 93 octane. You would probably be safe at 11psi since the US cars have a lower compression ratio.
Intercooled model specs:
Carrera GTs ran 12.5 PSI or .85 BAR 210hp
Carrera GTS ran 14.5 PSI or 1 BAR 245hp
Carrera GTS CS ran 16 PSI or 1.1 BAR 270hp
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1981 931 CGT replica, OEM CGT intercooler, .8 BAR WG spring, GTS Headlights, Innovative Wide band A/F, A/C delete, 16" Fuchs, Weltmeister 200lb lowering springs, Bilstein HDs front, Koni Sport rears.
Last edited by Nein37 on Sat Apr 03, 2010 10:52 am; edited 3 times in total |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat Apr 03, 2010 1:05 am Post subject: |
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As above: higher 8.5:1 CR (vs. 7.5:1 in S1 US and 8.0:1 in S2 US); .8 bar wastegate spring as opposed to .6 bar in US trim; and different DITC board. And I believe the BHP numbers are 177 in Euro trim and 156 in US.
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erstwhile owner of just about every 924 variant ever made |
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9xx
Joined: 18 Jun 2006
Posts: 627
Location: Jarvenpaa, Finland
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| Posted: Sat Apr 03, 2010 1:18 am Post subject: |
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| ideola wrote: | | .8 bar wastegate spring as opposed to .6 bar in |
Row S1 0.7 bar.
Row S2 0.65 bar (this is verified by my VDO boost gauge.) 
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Mikko
All gone: 931 '82 Alpine White, original option "220" G31 with LSD + 3 x 944 |
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Shurick
Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.
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| Posted: Sat Apr 03, 2010 9:06 pm Post subject: |
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S1 ROW (M31.01): CR 7.5:1, 0.75 bar of boost, K26-2470R6.10 turbocharger
S1 US (M31.02): CR 7.5:1, 0.45 bar, K26-2660GA4.10 turbocharger
S2 ROW (M31.03): CR 8.5:1, 0.65 bar, K26-2664G4.10
S2 US (M31.04): CR 8.0:1, 0.45 bar, K26-2660GA4.10
S1 had ignition distributors with different curves of ignition for US and ROW. S2 had different ignition modules.
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WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/ |
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