Quote:
Originally Posted by Shoo
Thank you for sharing your experience. Based on the above I can only conclude that there is nothing inherently wrong with fuel injected FE's. The key seems to be that "guys really know their stuff".
May I ask what kind hp and torque are you getting? Are you running pump or race gas?
I saw a couple of videos on Youtube of what I think is your car. All I can say is respect to both the car and the driver.  |
Horse power @ Flywheel 806@ 7600 torque 652 @5500 this was on a Superflow dyno that was calibrated before running and with a new load cell. It also repeated on a number of different pulls so I am very confident in the numbers. We got these numbers with the car exhaust system, we also tried an 1150 Dominator and it made 819@7600. I can't deal with the stumbles that inevitably come with carbs at high g loading. This thing makes just short of 600 lb/ft and 450 hp @ 4000 rpm so it has a broad power band given the fairly radical cam.
EFI The car uses a F.A.S.T. system with a Wilson 1600 CFM throttle body and Alpha N program. I actually program it for what ever my MAP sensor reads when I run it at different altitudes and barometric pressures but the new XFI system does that automatically. I can log air fuel ratios because it has a wide band sensor but cannot use a closed loop approach because of cam overlap. If you will notice from the video the engine pulls cleanly from 2500 RPM in the slow autox corner and it never stumbles even though it is cornering at 1.6 g's in the video. When I ran a carb (a highly modified Dominator) it used to die under hard stops and run unevenly under high cornering loads so I really like the fuel injection. It always starts when hot or cold because you can program everything from a lap top including acceleration enrichment and temperature compensation. I have run many different combinations of carbs over the years including duel 4 short bowls, duel 4 center pivots mounted side ways, duel 500 cfm center pivot 2 barrels and single 4's of 750, 850, 900 and 1150 cfm.
I would never go back from fuel injection unless it was on a street or drag race car that would never be asked to handle high g cornering or stops.
The engine is on race gas and is 14.7 to 1 and has about 29 d. advance at 6500 which says a lot about the cylinder heads.