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rotorhead rotorhead is offline
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Join Date: Jul 2003
Location: Port Macquarie Australia
Posts: 509
Suggestions wanted - 930 engine low on power

Hi guys,

I'm throwing this out to the forum as I am stumped and frankly I don't know where to go next. Maybe some enlightened expert like PorschePHD, DonE, RarelyL8, beepbeep, Wayne, John Walker etc etc may be able to give me a clue.

This will be a long post to try and cover it all; but here goes..

I bought the car in 2003 in the Middle East and brought it home with me in 2004. It was always a poor performer for a Turbo.

2005 - Top end rebuild (Mainly due to oil leak at cylinder base)
  • New Rings
  • Steel Headstuds
  • New K27-7200 Turbo
  • Air injection Delete
  • AC Delete

Still having low power issues
2005 - Fuel system
  • 6x new injectors
  • new Accumulator + Filter
  • 2x New Fuel Pumps
  • New Ignition Coil
  • Magnecore Wires

Put the veicle on a Dyno to establish a baseline. It made a measley 113kw see here Dyno results - my 930 Sucks!
Pulled the engine and rechecked Cam Timing and did a leakdown at 4%-6% across all acylinders. Was leaning out under boost so I probably wrongly assumed the Fuel distributer was the problem. So I ditched it with a...

2006 EFI Upgrade
  • Goingsuperfast EFI Kit
  • 60lb Injectors
  • Wasted Spark EDIS
  • EMS Stinger Programmable ECU
  • LC1 Wideband O2
  • Performance Exhaust
  • RartelyL8 Style Intake Filter

2007 Injectors blocked due to corrosion in fuel tank
  • Reconditioned Fuel Tank
  • New Fuel Pumps
  • Injector Service

back on the Dyno - only 140kw (Stock is 220kw)
There is no problem getting enough fuel to the engine... had to lean it out under boost. I am still running stock boost.

I guess I am at the point where I have now replaced the Air/Fuel and Spark delivery systems to the engine.

This car is turning into a real garage queen.
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2008 BMW 320i
2006 Mercedes ML320
2004 Mercedes ML270 cdi
1998 Porsche Boxter
1988 Porsche 930 Targa (sold)

Last edited by rotorhead; 11-11-2007 at 11:58 AM..
Old 11-10-2007, 03:13 PM
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