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Me like track days
 
Craig 930 RS's Avatar
 
Join Date: Sep 2003
Location: Kirkland, WA
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Question Stephen aka Porsche PHD - Your take on the boost/CR balance?

Generally speaking & for the benefit of everyone:

For a fully optimized and tuned CIS system (Adj WUR, IA fuel head, twin plug, K27 HF turbo, 965 IC, Tail WG, AFRs virtually level from top to bottom/12:1. Runs about 10 track days per year.

What would you prefer to see - lower CRs and 'higher boost', or vice-versa? Could you elaborate?

My own data point: I am currently at 7.5:1 with .9 bar boost.

Intended as an open discussion with Stephen's input as to actual experience. Thanks in advance!
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Old 11-05-2006, 09:47 AM
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IMO, if you're going to be tracking the car, where it sees high loads and sustained max boost levels, I think you're safer sticking with low C/R and moderate boost levels.

I'm sure Stephen will chime in with a more technical and scientific response though
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Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 11-05-2006, 07:18 PM
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I wanted a bit higher CR so that off boost it was very streetable and I don't intand on tracking the car so this was what I went with.. A couple of folks using the BAE kits on their SCs with low boost and love it because it is very linear acceleration.. But for a monster turbo motor less CR is better and safer

it all depends on street or track applications
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Old 11-07-2006, 06:11 AM
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http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&viewitem=&item=330044178307

look at the CR of this car
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Ben

Current project 73 914-6 Gt project rusteration 2.4

*Reproduction 914-6 oil tank source* 2623647426
Old 11-07-2006, 06:16 AM
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I am trying out 9:1 CR on a 3.8ltr TT motor that is in the works. The plan is to limit boost to 0.7 bar - no lag, quick spool. The hope that this is a nice streetable tyre burner with quick acceleration. I am not planning to race the car, so i dont need high end HP. (where i drive i rarely get the car in 5th gear). But, if i decide to track the car (DE etc), i intend to run 100octane and crank the boost a couple of notches.

This was all under the recommendation of my builder who has build porsche race cars for several teams (incl. some that raced at daytona).
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Old 11-07-2006, 07:10 AM
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I am running a 1986 3.3 turbo with 8.0 to 1 cr euro fuel system powerhaus stage 2 tubo kolken ic 964 cams and extensive head work completed the engine about 2 years ago and the power gained in the low end was unbelievable. I have no detonation problems and has been worry free. Also running with 1.0 bar spring so it can be done with a lot of tuning.

1986 Porsche 930 Strosek

Last edited by stephenshane237; 11-09-2006 at 03:49 PM..
Old 11-09-2006, 03:47 PM
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