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Join Date: Oct 2006
Location: Raleigh, NC
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Question A question for all the A/F guru's

I have a 79 930 which is currently undergoing a complete engine rebuild with some upgrades. Everything is at EBS being machined, and I need to get an idea of which path to take when it all comes back.

Will I be ok with keeping the stock fuel distributor with the these upgrades (listed below) or do I have to go ahead and upgrade to my other fuel distributor (a euro already re-worked for more fuel output).

If i go to my upgraded fuel distributor I know I will need the adjustable WUR and solenoid, but I need to conserve money at this point. The question I have is can I get away without all of this until later or will I have air/fuel mixtures that could detonate my engine?

Upgrades:

-3.3 upgraded to 3.4 Mahle pistons and cylinders 7.5:1 compression
-Twin plugged (going to block off second plug for now, but should still change the compression somewhat b/c of the additional area)
-Andial Intercooler
-SSI custom headers
-either a K27 or K27 HF turbo

Thank you in advance for any input you can give.

P.S. The complete story of my car, and the rebuild (w/pics) will be posted when I am closer to the rebuild stage
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 06-03-2007, 06:48 PM
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Crotchety Old Bastard
 
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Stock US fuel system components are good for at least 350RWHP, Euro can go 400RWHP. The bot-ons in your list can get you around 350RWHP; you will need head work to breach that level.
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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
Old 06-04-2007, 05:01 AM
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I would agree with Rarly that you would likely be okay. One point that I would make though is that you don't necessarily need both the fuel head mod and the adjustable WUR/solenoid.

I happen to have it all the car runs great now that its all dialed in but I think there are plenty of people running just the fuel head mod with good results.

One thing to be sure though is that keeping the AFRs in check isn't the place you want to try and save money. Just something to think about.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 06-04-2007, 11:23 AM
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Crotchety Old Bastard
 
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From what I have seen it is a rare event for anyone to actually need the fuel head mod. The stock Euro head will support nearly 400RWHP. That is a serious power level; most folks don't go that far with their builds.

The adjustable WUR however is a useful device for even mildly modded engines. A dyno run or LM1 will tell you what your A/F readings are. If you need to tweek them the adjustable WUR is the only way it can be done. The RPM solenoid may not be needed. The A/F graphs will tell you that as well.

I would not spend any money on CIS enhancements until you have an A/F graph of your setup.
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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
Old 06-04-2007, 12:40 PM
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Thanks guys, you were both a great help. I'll keep my stock fuel head (euro) for now until I check the A/F's
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 06-04-2007, 05:25 PM
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I would definitely check your afr cause I had a Euro fuel head on my 3.0L and it ran lean.
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Dean
911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
Old 06-04-2007, 06:44 PM
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