Fuel System

The following is a high-level diagram of the fuel system.

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No Bullshit Fuel Filter

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You gotta love a company like Injector Injector Dynamics who puts the following on their home page and then walks-the-walk by offering innovative products backed by data:

As a results based engineering company, we have a STRICT no BS policy. Our product information is backed by data, and sound engineering principles. Our strict adherence to facts has earned the respect of many, but our willingness to call BS when we see it has created a great deal of controversy. We accept this controversy as a small price to pay for holding the industry to a higher standard, and we will continue to push for a motorsport community that makes decisions based on facts, not buzzwords, nonsense, or outright falsehoods.

I saw this video made by the company's founder showing a prototype and it took them a year longer than expected to productize it. Apparently they didn't want to release it until they had it right which is fine by me.

It came very well packed in a large box packed with the starch-based peanuts so they score well with environmentalists as well as my kids who love to dissolve them in the sink. I'll only outline what's in the video and this spec sheet:

  • Only filter I've see with actual testing data

  • Meets Bosch's specification for the protection of fuel injectors

  • Holds a high-level of contaminants while maintaining low restriction to flow

  • Delta pressure gauge indicates how clogged the the element is

  • Schrader valve to relieve pressure and drain gas

  • Spin on/off canister with no-tool safety latch

  • Optional pressure and temp block and sensor

  • Integrated mounting bracket

Some details:

  • Inlet/Outlet: -8 SAE J1296 P;

  • Pump inlet should be -8 or -10

  • They made made 1450HP wheel on a GTR with stock bends on a -6

  • They like to drop two Whalboro 450s or 485s

Fuel Tank

TODO: update with information and pictures from the blog.

Qty. Part Number Description Unit Price Ext. Price
1 n/a 1/4" x 4" Angle Aluminum (Per Foot) n/a n/a
1 n/a 1/4" x ??? Aluminum (Per Foot) n/a n/a
1 n/a 2" x 36" x 3/16" Ultra-Strength, Self-Adhesive Neoprene (Durometer 70A - Hard) n/a n/a
  n/a Second Skin Damplifier Pro Butyl Rubber Sound Deadener $6.63  
4 n/a 3/8" x 3-1/2" Grade 8 Hex Head Screw n/a n/a
4 n/a 3/8" Grade 8 Nyloc n/a n/a
8 n/a 3/8" Grade 8 Washer n/a n/a
1 n/a 5/16"-18 Stainless Steel Screw n/a n/a
1 n/a 5/16" Stainless Steel Washer n/a n/a

Fuel-Filler

The inlet diameter is 2.0".

Qty. Part Number Description Unit Price Ext. Price
2 FFF51 2" Ultra Flexible Fuel Filler Hose (Per 500 mm) $25.36 $50.72 
1 2790 2" Vibrant Performance Stainless Steel T-Bolt Clamp (Pair) $12.86 $12.86 
1 n/a Custom Alumium Cover Plate n/a n/a 

The throttle body and supercharger intake collide with the fuel filler.

FUEL-Level Sender

The supplied fuel-level sender a nice unit from Centroid Products which has no moving parts – it uses capacitance rather than a float. The one supplied in the kit was configured to integrate seamlessly with the Koso gauge. Specifically, it applies signal damping to prevent the reading from bouncing when the fuel sloshes in the tank and it maps the unique shape of the SL-Cs fuel tank to eight discrete restive/ohm-based values. The Koso then maps those eight values to the ten display bars on the gauge.

I'm not using the Koso gauge and my MoTeC system can provide a more accurate and granular solution so I contacted Centroid to purchase a sender with an analogue 0-5V output an no tank shape compensation. They informed me that they would re-calibrate the sender at no cost, a nice surprise.

To calibrate the system, I will put some fuel in the tank and run the low pressure pump until it stops pumping being careful to not damage the pump by running dry for very long. I will take a voltage reading which will be the "empty" setting. I will then add a gallon of fuel and measure the voltage. I will repeat this until the voltage doesn't change at which point the tank is "full" as far as the sender is concerned. Of course, more fuel could be added at the very top of the tank and the fuel filler, but that's not a concern. Given that the tank holds 19.2 gallons, I will have 20 data points with all but one being approximately 5% apart. I could also go with half gallon increments, but I doubt that I'll have that much patience. This data will then be entered into a custom map in MoTeC.

The mounting flange on the fuel tank had five threaded holes so I used a 10-24 tap, five 10-24 bolts and #10 washers and the supplied cork gasket to mount the sender. Loctite 442 (aka blue Loctite), which is compatible with fuel, was applied to the threads. Note that the holes are NOT symmetrical and that the sender and gasket only fit one way! The way to figure out the orientation is to note that two of the bolt holes are spaced further apart than the other ones.

Qty. Part Number Description Unit Price
5 n/a 1-1/4" x 10-24 Stainless Steel Socket Head Cap Screw n/a
5 n/a #10 Stainless Steel Washer n/a

 

Fuel Tank Closeout Panel

 

Qty. Part Number Description Unit Price Ext. Price
1   6061 Aluminum Sheet 0.1” x 55-3/4” x 13-3/4” $95.00 $95.00
3   3/4" x 1/16" 6061 Aluminum Angle (Per Foot) $1.46 $4.38
1   1" x 1/16" 6061 Aluminum Angle (Per Foot)  $1.76 $1.76
???   DEI Boom Mat Floor & Tunnel Shield II - Heat and Sound Insulation $10.26  
???   Second Skin Damplifier Pro Butyl Sound Deadener $11.08  
???   10-24 x 3/4" Stainless Steel Button Head Screw    
???   #10 Stainless Steel Washer    

Low-Pressure System

The Holley 12-125  pumps 110 GPH @ 7 psi. I cut a hole a 7-1/2" x 11" by drilling a four holes from the inside of the car using a 1" hole saw. Because the space is so tight inside of the car and the bottom of the car is just flat aluminum it was much easier to cut the hole from the bottom up. While my style of car lift is usually completely out of the way, it covers this space so I had to carefully lower the car onto jack stands.

Qty. Part Number Description Unit Price
1 12-125 Holley Electric Low-Pressure Fuel Pump $239.95
1 12379 Aeromotive In-Line Filter, -08 AN Male, 100-Micon Stainless Steel Element $137.60
1 09-0930 Peterson -8 AN Billet Panel Mount Fuel Shut Off Valve $213.42
1 FCU0810 10' Aeroquip Startlite -8 AN Hose $79.97
1 FBM5008 Aeroquip 1/2" NPT to -8 AN Male Straight Fitting, Black $4.97
1 FBM5007 Aeroquip 3/8" NPT to -8 AN Male Straight Fitting, Black $3.97
1 FBM5005 Aeroquip 3/8" NPT to -6 AN Male Straight Fitting, Black $2.97
2 FBM5073 Aeroquip -8 AN Straight Bulkhead Union Fitting, Black $9.97
2 FBM5103 Aeroquip -8 AN Bulkhead Nut, Black $2.97
1 FBM55072 Aeroquip -6 AN Straight Bulkhead Union Fitting, Black $4.97
1 FBM5100 Aeroquip -6 AN Bulkhead Nut, Black $2.97
1 FBM4413 Aeroquip -8 AN  Straight Reusable Hose End, Black $11.97
1   Aeroquip TBD  
1 15692 Aeromotive -8 AN Female Swivel Union Coupler, Black $13.29
1 N/A Aluminum Sheet 0.1” x 12-1/2” x  9” $28.50

2 920-2 Injector Dynamics -8 AN to -8 O-Ring Boss (ORB) Adapter  $11.50

https://www.aeromotiveinc.com/product/male-an-08-100m-stainless-filter/

Hex: http://www.carbideprocessors.com/bondhus/bits-and-blades/hextender/ 

 

Access Panel

 

 

High-Pressure System

Qty. Part Number Description Unit Price Ext. Price

1

n/a

0.1” x 12.25” x 8.5” Aluminum Sheet

$20.00 $20.00

3

?? Dezus 5/16" Diameter x 0.??" Length, Quarter-Turn, Spring-Loaded Fastener $ $
3 3019-001 Dezus Weld Plate Spring Receptacle; 5/16" Studs $1.99 $5.97
3 n/a Custom 3D-Printed Spacers n/a n/a
6 n/a 1/8" Diameter for 0.126" to 0.187" Material Aluminum Rivit n/a n/a
4 n/a 8-32 x 1/2" Stainless Steel Button Head Hex Drive Screw n/a n/a
4 n/a 8-32 Stainless Steel Nyloc n/a n/a
8 n/a 8-32 Stainless Steel Washer n/a n/a
    Sound    
    Rubber/Foam    

 

 

Parts

Qty. Part Number Description Unit Price Ext. Price
1 20-0339-00 Radium Fuel Surge Tank $409.95 $409.95
1 91901 FUELAB 1,000 HP, Brushless, In-Tank Fuel Pump $496.45 $496.45
3   -8 AN ORB to -8 AN Male    
Qty. Part Number Description Unit Price
1 ID F750 Injector Dynamics Fuel Filter $300.00
1 ID PTS Fuel Pressure/Temperature Module for ID F750 Filter $250.00

 

  • The fuel filter has an integrated Bosch PST-F 1 pressure/temp sensor

Fuel Flow Calculations

Fuel flow is measured in gallons per hour (GPH) or liters per hour (LPH). To ensure that the engine has

A 747 burns about 1 gallon per second when cruising which is 3,600 gallons per hour.

While flow is important, what really matter is that fuel rails have consistent and stable pressure.

Optimal GPH = (Max. HP x BSFC) / 6

Brake-specific fuel consumption (BSFC) can be determined using an engine dyno and other equipment to determine how much fuel an engine consumes over a specific period of time. I didn't have that done so I'm going to use a rule-of-thumb number.

Estimated BSFC at wide-open throttle (WOT)

  • .5 naturally aspirated

  • .55 nitrous

  • .6 for turbo

  • .65 for supercharged

Optimal GPH = (1,000 * .65) / 6 = 108.3

The Holly 12-125 is rated at 125 GPH free flow and 110 GPH at 7 PSI

Articles:

Post on sealant; Found out some things you may want to know. In talking to Permatex, they advised me that they had to rebuild their formulas for thread sealer and this new stuff is not as effective on todays gas as it used to be. As I understood it, the main ingredient that proved so effective on the ethanol in gas today, was South Georgia Pine Sap....the irony here is, its where I live. It took several months for gas to eat thru my Permatex thread sealer and start to leak.

Anyway, the recommended product from the technician I talked to, to use on tanks (I have some on order) is Gasoila E-seal Thread Sealant (Yellow Can). It is designed for E-10 and E-85 blended gasoline.