The stock fuel system on an FC3S turbo is very limited and unable to support higher horsepower levels.  To ensure adequate fuel supply, almost all parts of the fuel system have to be replaced and upgraded.

The stock fuel pump from an FC3S turbo is only good for about 50gph or about 180lph.  If the voltage supply is not degraded, the stock fuel pump is supposed to be capable of supporting up to 300bhp at the flywheel.

The stock fuel injectors from an FC3S turbo are 4 x 550cc/minute, which totals to 2200cc/minute or 2.2 liters/minute.  At 85% pulsewidth (safe maximum), they are able to support about 280bhp at the flywheel.

The stock 5/16" O.D. metal hard lines can support 500bhp at the flywheel.

The stock fuel rails have been proven to support 650bhp at the flywheel beasts, so there's no reason to replace them either.  The applies both to the Zenki cast aluminum or Kouki metal tube fuel rails.

The rest of the fuel system upstream of the stock main/high-pressure fuel filter can be replaced with a more efficient system.  The stock fuel system is based on a "series" layout.

Stock, series fuel system

Modified, parallel fuel system

Modified parallel fuel rail system parts list for Zenki FC3S Turbo
Pic	Description
	Aeromotive   A1000 FI Bypass Regulator CNC-machined 6061-T651 billet aluminum Anodized red and black Designed for use with Aeromotive A1000 fuel pump Adjustable from 30psi to 70psi Two -10AN inlet ports One -6AN return port 1/8"NPT gauge port - NPT plug included Vacuum boost port Alcohol compatible Jegs part number:  027-13101 Jegs price:  $129.99 Summit Racing part number:  AEI-13101 Summit Racing price:  $135.95 -10AN inlet port fittings can be replaced with -6AN × -10AN adapters or alternative. Similar fuel pressure regulators available from SX Performance.
	Nitrous Oxide Systems (NOS)   Specialty "Y" Fitting Billet aluminum Anodize red or blue -6AN male ends Jegs part number:  741-17835 (blue), 741-17836 (red) Jegs price:  $29.99 Summit Racing part number:  NOS-17835 (blue), NOS-17836 (red) Summit Racing price:  $29.95 Specialty "Y" Fittings also available in different sized ends other than -6AN male.
	Moroso   "Y" Fuel Block Aluminum main body 3/8"NPT brass barbed fitting inlet -6AN male end outlets 1/8"NPT gauge port - NPT plug included Summit Racing part number:  MOR-65180 Summit Racing price:  $30.39 Useful for "economy" systems to use rubber fuel (injection) hose into inlet.
	Earls   -6 to 12mm × 1.25 adapter Aluminum Anodized blue Also used on Dellorto, Solex, and Mikuni carburetors Summit Racing part number:  EAR-991945 Summit Racing price:  $6.95 Two are needed for each engine. Fuel rails may need to be cut for proper clearance. Similar adapters offered by Goodridge, Russells, and XRP.
	Earls   -6 to 14mm × 1.50 adapter Aluminum Anodized blue Also used on power steering systems Summit Racing part number:  EAR-991954 Summit Racing price:  $5.95 Two are needed for each engine. Similar adapters offered by Goodridge, Russells, and XRP
Jegs - http://www.jegs.com/ Summit Racing - http://www.summitracing.com/

Kouki FC3S turbo owns can modify their stock metal-tube fuel rails to run in parallel.  The stock Kouki FC3S turbo fuel rail ends can be cut, and steel (-6AN) weld fittings are available.



Questions?  Comments?  Send mail to:  reted@fc3spro.com

01/29/2004