Walbro 190lph Fuel Pump
Walbro 190lph Fuel Pump:
Before and After
Last Update:
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Before the Walbro was installed, a frequent drag racer reported that he was starting to lean out in 3rd gear toward the end of the quarter mile when he ran a 50 horsepower shot of nitrous. An intank fuel pump ensures your car gets enough gas and doesn't lean out. In case you don't know, leaning is a very bad condition to have in a car. You ever heard engine knock? What that is doing is effectively causing explosions inside your engine. What usually happens is that a hole is burnt through the piston and then you face a very costly repair.
So what will a Walbro fuel pump do? Well first, there are two replacements available for the 93-97 Probe GT, the 190lph (Liter Per Hour) and 255lph versions. Assuming a linear relationship between flow rate and horsepower, the 190lph is good for about 425 horsepower and the 255lph is good for about 570 horsepower. I believe the stock fuel pump is good for about 90lph or roughly 200 horsepower. A 50 shot of nitrous bumps the crank horsepower from 164 to 210 or so. You're barely going to make that safely and really good for a 1/4 mile run. Anything above that and pow, Time for a new engine.
I purchased the 190lph. Why? First, I'm shooting for about 270 horses max. Anything above that and I'll require a serious engine and tranny rebuild, which translates into roughly $5000-10000. No thanks. I'll keep my car reasonably fast, thank you. Second, the 255lph is supposed to be much louder. Not that I would care much, but having a 255lph just seems excessive when I'll barely be stressing the 190lph. Third, if I want a car in the 400hp range, I'll want something that was designed for it from the ground up, like a Viper.
BEFORE:
Ugh, I really wish I had the foresight to take some before pictures. My buddy who helped me install the stuff is a photography hobbyist, fer cryin' out loud. Oh well, we were too busy turning wrenches anyway. So I don't have any pictures.
AFTER:
So saying all of that, let's progress to the installation. Well shoot, guess what, Ross Lapkoff already has an excellent page up with pictures. Granted, my shutterbug buddy could probably have snapped better pictures, but Ross is the man so here's a link to his excellent section on how to do the fuel pump.
Ross Lapkoff's Walbro fuel pump installation
Cost Analysis
I Spent:
82 bucks, 68 for the fuel pump, 9 for the installation kit, and 5 for shipping.
When:
September 8, 1998 (Finally installed 10/24/1998)
Expenses:
25 bucks for pizza and beer to feed my buddy in this picture.
