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

Kens86gt · 04-05-2005, 10:48 PM

Well, I'm sorry to say I got the numbers from the run today.

Best HP--216 (4400rpm)
Best Torque--278 (3800rpm)

I wanted more, but it seems I need a fuel pump. At least that is what I'm guessing as my a/f ratio started climbing from 12.2 at 3500 to 16.0 at 5300rpm's.

Now the car has the stock 88lph pump and stock 19lb injectors--think this would cause the lean condition?

Based on the Mike Wesley article in the tech section, adjustable fuel pressure regulators may be a waste of money unless the injectors are maxed out.

If I can't turn up my fuel pressure without the computer "fixing" it, how else do I get rid of this lean condition?

I am installing a new 155 pump in a few days.

Mods are
Gasket ported Cobra intake and GT40 heads
70mm TB
1.6 Roller rockers
Stock cam (speed density)
Shorty headers, mac H and Mac cat-back
5 speed

04-05-2005, 10:48 PM	#1
Kens86gt Clueless Join Date: Apr 2005 Location: Niles, Ohio Posts: 8	Went to the dyno--really lean, help Well, I'm sorry to say I got the numbers from the run today. Best HP--216 (4400rpm) Best Torque--278 (3800rpm) I wanted more, but it seems I need a fuel pump. At least that is what I'm guessing as my a/f ratio started climbing from 12.2 at 3500 to 16.0 at 5300rpm's. Now the car has the stock 88lph pump and stock 19lb injectors--think this would cause the lean condition? Based on the Mike Wesley article in the tech section, adjustable fuel pressure regulators may be a waste of money unless the injectors are maxed out. If I can't turn up my fuel pressure without the computer "fixing" it, how else do I get rid of this lean condition? I am installing a new 155 pump in a few days. Mods are Gasket ported Cobra intake and GT40 heads 70mm TB 1.6 Roller rockers Stock cam (speed density) Shorty headers, mac H and Mac cat-back 5 speed