TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Need help quick, Racetronix plug play harness fuel pump
I purchased a Racetronix kit about 4 to 5 years ago. Just got around to installing the 255 L/hr Walbro fuel pump at a local shop. I also purchased the plug & play harness kit.
Does anyone know if there are any directions?
Do I have to use the harness kit?
Seems like its optional; only to be used if I need higher voltage at the fuel pump, correct?
I have been on Racetronix web site and can not find any links to help on these matters or instructions.
__________________ '87 L98 TPI IROCZ, 395cu.in. ZZ4 block (.030" over bore), ported Holley StealthRam; 3.875" Callies DragonSlayer crank, 5.85" Eagle H-beam rods, 14cc dished SRP pistons part# 148988, AFR190 heads, 3.70 rear gears, 224*/230* 114*LSA 0.530/0.536 lift CompCams cam, 1.6 roller rockers, 3000 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, MAF w/o screens, 30#/hr Ford injectors, 52mm TB with airfoil, TB coolant bypass, Lay Ind. ram air kit, SS Brakes 1LE upgrade 12" rotors dual piston calipers, turbo TransAm fuel pump, K.Brown weld-on subframes. Rear tires: P295/35R18 BFG Drag Radials.
Best ET 12.12 sec @ 110.55 mph @ Milan.
With 395, ET 12.197 sec @ 113.65 mph @ Milan.
With 350, ET 12.97sec @ 105mph M/T ET Streets.
Best with HSR: ET 12.385 sec @ 108mph @ OSW.
Re: Need help quick, Racetronix plug play harness fuel pump
Yeah the harness is designed to run direct voltage output from the alternator. It will give around 0.5-1.0 extra volts to the pump giving it more output.
You can plug in your factory harness to the pump and run it just like that i do believe, but the hotwire harness feature is nice to have.
One end bolts to the alternator stud output and runs to a new relay at the rear of the car. One end of the wiring harness plugs into the factory fuel pump harness plug thats on the body of the car next to the gas tank. Then there is another connection from the new relay to the pump connector on the tank assembly. Its been awhile but its pretty straight forward. Harness connectors only plug into the correct connection on the car so its impossible to screw it up.
Re: Need help quick, Racetronix plug play harness fuel pump
Thank you for the replies. I am going to run the fuel pump thru the factory wiring to get the car back tomorrow morning. Then once at home, I can install the harness. My data scans show 13.9 or so volts for the fuel pump.
Re: Need help quick, Racetronix plug play harness fuel pump
Quote:
Originally Posted by doc
My data scans show 13.9 or so volts for the fuel pump.
Bear in mind that is the V reading at the relay ; not the actual voltage seen by the pump at the other end of the car.Voltage drop , bad connections can result in less than optimum voltage at pump
That is why the harness works; it gives higher voltage direct to the pump .Because of the higher current draw, a heavier feed wire is used
14psi, pump gas street tune 
