Need a little help to figure out whats going on with my fox. Little background on the car. 88 5.0 converted to mass air, 5 spd, ud pullies, 70mm tb, cold air intake, electric fan, shorty headers, h pipe. 2.5" exhaust. Car has 3.55 gears, and possibly a cam, stock intake manifold, and what look like stock heads. Car has aeromotive fp regulator and 19lb injectors. Base timing set at 12 degrees.
Had the car on the dyno yesterday, & first pull was 179rwhp & 258rwtq. Afr was super lean in the entire rpm range between 15-17. So we adjusted fuel pressure from 39lbs up to 46. Made second run, car picked up power. Now at 190rwhp & 264rwtq. Car was still lean, but better. So we added more fuel pressure, now at over 50psi. Once again car made more power, but still lean with AFR in the 14 range. So last pull we maxed out fuel pressure to 62psi with vacuum line off, added 2 more degrees of initial timing and the car put down 235 rwhp and 309rwtq. However the car still only had AFR in the mid 13 range.
To me something seems wrong here. This car should not be maxing out the 19lb injectors with the limited mods, & the car should not be making this kind of power... All pulls were in 4th gear which I believe is the 1 to 1 ratio and done on a dynojet. Below is a snap shot of the sheet.
Had the car on the dyno yesterday, & first pull was 179rwhp & 258rwtq. Afr was super lean in the entire rpm range between 15-17. So we adjusted fuel pressure from 39lbs up to 46. Made second run, car picked up power. Now at 190rwhp & 264rwtq. Car was still lean, but better. So we added more fuel pressure, now at over 50psi. Once again car made more power, but still lean with AFR in the 14 range. So last pull we maxed out fuel pressure to 62psi with vacuum line off, added 2 more degrees of initial timing and the car put down 235 rwhp and 309rwtq. However the car still only had AFR in the mid 13 range.
To me something seems wrong here. This car should not be maxing out the 19lb injectors with the limited mods, & the car should not be making this kind of power... All pulls were in 4th gear which I believe is the 1 to 1 ratio and done on a dynojet. Below is a snap shot of the sheet.