West_Racing
07-05-2008, 06:30 AM
I have this setup on a 408ci BBC. The engine has the performer RPM aluminum heads and a .600" lift hyd. roller cam. (230 degrees @ .050" lift). This cam was ground for my combination. The engine has a true 10.5:1 static compression. The exhaust starts out with a custom built 2" to 2 1/8" stepped header. (about 36" to 38" primary lengths) This goes into a 3.5" collector and then runs through a 3" exhaust system and 3" big block series flow master mufflers. (the quieter ones :) ). The fuel injector chip was sent to me for this combination. The vehicle is a Toyota Landcruiser (looks like a jeep for those who don't know). It is an automatic with 5.29:1 gears and 39.5" tires.
OK; I think that generally covers my combination. Now to the injector question. (note: This engine was carburetor before so I know there is no issue with its running.) I have had to work hard to get this thing to run right. I have it where it will idle good, and throttle good. If you hold the throttle open in neutral it will start popping in the exhaust, if it is in gear it goes rich and surges like an injected blower engine. Could this simply be that at low rpm my engine wants smaller injectors? This is my present guess, but I do not want to spend $400 to $500 to just test this idea. (note: I plan to turn the engine up to about 6300 rpm.)
If someone can give me some insight into this EFI it would be greatly appreciated. I have years of race engine building experience. But the EFI stuff is new to me. I am very good with computers and electronics, so there is not much concern for tuning up the software side of this system. I just feel that right now I have a mechanical injector size issue?
Thanks; John
OK; I think that generally covers my combination. Now to the injector question. (note: This engine was carburetor before so I know there is no issue with its running.) I have had to work hard to get this thing to run right. I have it where it will idle good, and throttle good. If you hold the throttle open in neutral it will start popping in the exhaust, if it is in gear it goes rich and surges like an injected blower engine. Could this simply be that at low rpm my engine wants smaller injectors? This is my present guess, but I do not want to spend $400 to $500 to just test this idea. (note: I plan to turn the engine up to about 6300 rpm.)
If someone can give me some insight into this EFI it would be greatly appreciated. I have years of race engine building experience. But the EFI stuff is new to me. I am very good with computers and electronics, so there is not much concern for tuning up the software side of this system. I just feel that right now I have a mechanical injector size issue?
Thanks; John