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Registered
Join Date: Jul 2005
Location: Reno, NV
Posts: 5,941
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How much HP from 1 bar spring
Just curious, all things being equal,, with the only upgrade being a 1 bar spring. What would the increase in HP be ??
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon |
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03-09-2010, 07:29 AM
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Porsche-Poor
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I've heard approx 20hp?
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1979 911 RS clone hotrod 1983 930 turbo-sold, will be missed 1992 964 C2 Coupe-regrettably sold 1980 911 SC Weissach-regrettably sold 1975 911S-sold but not forgotten |
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03-09-2010, 08:55 AM
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Crotchety Old Bastard
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It depends on the mods. If the engine doesn't flow well then less power.
I use 15HP/0.1bar as a conservative rule of thumb.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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03-09-2010, 08:58 AM
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Metal Guru
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If you have a K27 I wouldn't bother going over .9 bar.
The factory only took the late model 3.3 turbo engine to .9 bar for a reason: 1 bar put the K27 over the choke line, so that really hot air was being fed to the engine. I know this to be true because with my car the feeling of going between .8 and .9 bar is better than between .9 bar and 1 bar.
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Paul B. '91 964 3.3 Turbo Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb |
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03-09-2010, 11:49 AM
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Registered
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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If you are going from a true .8 bar to 1 bar you can make up to 11% more power based on the math (.2/1.8=11%).
However, as others have noted there are things that will make it less as efficiencies fall off. |
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03-09-2010, 07:53 PM
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Registered
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,459
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Not enough compare to the $s it might cost you, if that's all you do - just the spring.
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03-10-2010, 02:55 PM
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1979 Porsche 911SC
78 Porsche 911SC 3.0L, 3.3Turbo soon. 
1991 Porsche 964 Turbo
