max rwhp walbro 255 can support?
08-13-02, 06:21 PM
#4
Precision Turbo and Engine http://www.precisionte.com
are heavy hitters in the turbo world and build some outrageous V6/V8 turbo cars. They have a 6 second single turbo car and plenty of 7 and 8 second cars as well.
They are well known in the Buick GN world (turbo V6) and they tested 4 separate Walbro 307's (255lph) and a Walbro 340's (hi pressure 255lph-shimmed pressure spring on a stock 307 in reality). Running thru -8AN line and 14 volts to the pump (hot wire kit with larger guage wire and a relay) they found they found that all of the 340 units could support in excess of 700 flywheel hp. This is about 575rwhp. When running the standard 12.2 volts to the pump the volume and HP decreased 20%. Definately hot wire the pump to get the higher voltage from the alternator.
Should be enuf to support any streetable 13BT setup.
I run an intank Walbro 340 for my setup with no hiccups at all. Best $109 I ever spent.
GNX7
are heavy hitters in the turbo world and build some outrageous V6/V8 turbo cars. They have a 6 second single turbo car and plenty of 7 and 8 second cars as well.
They are well known in the Buick GN world (turbo V6) and they tested 4 separate Walbro 307's (255lph) and a Walbro 340's (hi pressure 255lph-shimmed pressure spring on a stock 307 in reality). Running thru -8AN line and 14 volts to the pump (hot wire kit with larger guage wire and a relay) they found they found that all of the 340 units could support in excess of 700 flywheel hp. This is about 575rwhp. When running the standard 12.2 volts to the pump the volume and HP decreased 20%. Definately hot wire the pump to get the higher voltage from the alternator.
Should be enuf to support any streetable 13BT setup.
I run an intank Walbro 340 for my setup with no hiccups at all. Best $109 I ever spent.
GNX7
08-15-02, 02:53 PM
#6
Lives on the Forum
350hp to the wheels as a rule in my book.
I don't trust those things over that kinda power levels.
If you're making more power, you can afford a Bosch Motorsports fuel pump anyways.  The Bosch fuel pump runs about the same kinda flow number (it runs at a higher pressure than the Walbro), but I'd trust Bosch over Walbro anyday.
A friend just troucleshooted a hesitation problem to his failing Walbro fuel pump a few days ago - he's pissed.  Datapoint - it was running fine for 2 years...
-Ted
I don't trust those things over that kinda power levels.
If you're making more power, you can afford a Bosch Motorsports fuel pump anyways.  The Bosch fuel pump runs about the same kinda flow number (it runs at a higher pressure than the Walbro), but I'd trust Bosch over Walbro anyday.
A friend just troucleshooted a hesitation problem to his failing Walbro fuel pump a few days ago - he's pissed.  Datapoint - it was running fine for 2 years...
-Ted
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