MustangWorks.com : Ford Forums - View Single Post - Went to the dyno--really lean, help

jimberg · 04-06-2005, 02:07 PM

An 88 lph would be able to pump about 130 #/h of fuel which is good to about 260 hp at the flywheel. That's at a 100% duty cycle which you can't count on. Your dyno numbers show that you are probably hitting about 250 hp at the flywheel if you assume a 15% drivetrain loss which confirms that you don't have a good enough fuel pump. The 155 should do nicely. I'm getting over 350 rwhp with a 155 right now.

Install the adj. FPR, but set it to the stock 39psi to start. Take it to the dyno and see what happens. You basically want a flat line as far as a/f ratio goes and 12.2/1 is a good place for you to be.

04-06-2005, 02:07 PM	#5
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Re: Went to the dyno--really lean, help An 88 lph would be able to pump about 130 #/h of fuel which is good to about 260 hp at the flywheel. That's at a 100% duty cycle which you can't count on. Your dyno numbers show that you are probably hitting about 250 hp at the flywheel if you assume a 15% drivetrain loss which confirms that you don't have a good enough fuel pump. The 155 should do nicely. I'm getting over 350 rwhp with a 155 right now. Install the adj. FPR, but set it to the stock 39psi to start. Take it to the dyno and see what happens. You basically want a flat line as far as a/f ratio goes and 12.2/1 is a good place for you to be. __________________ 351W 89 Mustang GT Convertible