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Quote:
Originally Posted by JBL930 View Post

The 935 ran 2.7 bar!! But you had the heads welded on, lots of water in there to help, as well as the flat fan, and then you simply threw the whole top end in the scrap bin after 30hrs.....



2.7bar of boost in Porsche speak is really 1.7bar above atmospheric pressure, so approx 25psi, which is still a hell of a lot of boost!

In regards to high octane and keeping the combustion temps down, I expect my water/meth kit help a lot The testing begins tomorrow...
Old 08-11-2011, 10:11 AM
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Max Sluiter
 
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Yep, Europeans usually quote absolute boost pressure rather than gage. The thing is that atmospheric pressure is only 1 bar at sea level, so if you run 2.7 bar on top of mount everest that is a lot more than adding 1.7 bar to atmospheric pressure.
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Old 08-11-2011, 10:20 AM
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I never heard or saw a 935 head welded on back when I worked at Gunnar Porsche 22 years ago and there were alot of different 935's there.
Usual boost was 1.4-1.5 bar and the driver could turn it up higher for one shift and then had to turn it back down or risk burning through a piston.
Old 08-11-2011, 10:25 AM
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Max Sluiter
 
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I think it was only for factory cars like the 935.78 and 936 since it was done with an electron beam and was not accessable for customers. 956 did this too, I thought.
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911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
http://www.flickr.com/photos/max_911_fahrer/
Old 08-11-2011, 10:35 AM
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JBL930 - RON and MON averaged together is what we use. Typically the best we get around here is 93 at the pump, racing fuel is available at extreme cost ($9+ per gallon). What I love about E85 and what makes it hard to compare it's detonation resistance to gasoline is it's cooling effect on the chamber. I know of a few 2.0L 4 cylinder engines making 1000hp at the wheels on E85 running boost pressures around 50psi. They compare it to C16 except they say it makes more power than C16. The most difficult part of running E85 at that power level is getting enough of it. I think on an air cooled engine E85's effects may be greater than water cooled engines.
Old 08-11-2011, 11:22 AM
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I saw a set of welded head/cyls at Amalfi Racing years back. I am not sure what they were to but they were on the bench.
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Old 08-11-2011, 11:24 AM
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They welded the heads on the GT2's too i believe, common practice on the air cooled race motors. Makes a little more sense about the 2.7bar, i thought it seamed silly high...... Notice even on this run it's only 1.5bar, monster motor and turbos though....

Porsche 935 Dyno Pull - YouTube

We've all seen it before, but it's worth watching over and over


Edit: Here's a Moby 935 motor on the RS Tuning dyno, notice them holding the load..... There's been more air cooled turbo winning race motors in this dyno cell than anywhere else on earth

http://www.youtube.com/user/RSTuning911#p/a/u/1/8m0j295-9fM
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Last edited by JBL930; 08-11-2011 at 05:28 PM..
Old 08-11-2011, 05:17 PM
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As a side note I dynoed my car tonight. Stock 3.3L with EFI and a big turbo made 450 rwhp @ 5600 rpm on 1.3 bar. I'm confident we could have found another 50 rwhp with a few more psi and some timing adjustments. I think my goal is going to be attainable without spending a fortune.

BTW - I'm still a bit shocked but very happy
Old 08-11-2011, 08:07 PM
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Nice numbers!
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Old 08-12-2011, 05:00 AM
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Very nice numbers!

I've got a set of heads from a 934 turbo that are twin plug, flame ringed, and oil cooled. These type of mods may work for you without breaking the bank.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 08-12-2011, 06:24 AM
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Brian, I am all ears.
Old 08-12-2011, 07:10 AM
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Darrin i did a little research after i got my 3.4 pistons and cylinders. they are 3.2 cores. what some of these shops have been doing is getting 7.5 to 1 je pistons 98mm. then they send the pistons and cores to us autochrome and they bore the cores and replate them to match the pistons. and it was way less expensive than the thousands of dollars every one is charging for a set of those.
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Old 08-12-2011, 08:33 AM
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Yeah, I gotta do some homework on P&C's. At first the LN Engineering Nickies look to be the best way to go, but watching Juan make 700+hp on a set of used 3.3 P&C's he bolted onto his 3.2 Carrera 7 years ago kinda makes ya wonder.. I will most likely wait till the motor is apart and we determine the condition of my parts.
Old 08-12-2011, 08:43 AM
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