Posted by Will (in IL) [69.136.10.43] on Monday, March 24, 2014 at 20:51:34 :
In Reply to: How is the new fuel injection? posted by Mike Hernke (MO) [75.145.240.254] on Monday, March 24, 2014 at 20:20:42 :
Starts up great, no pings or flooding. It still feels a little down on power, but does pull good up to 5,000 RPM in 3rd (~58 MPH)before I shift to forth.
The smaller Throttle Body is likely the reason, but the Holley looks like it was probably too much for my engine build.
The design between the Holley Throttle Body and GM TBI system are very simular. Holley even has the cast in the idle air control passages but did not use one in their system. The Holley system has an adjustable fuel pressure regulator, where the GM unit is fixed. The Holley has a 2" bore per barrel, while the GM has a 1-11/16" bore per barrel. Based on some post by others and some research, the unit I received is fitted with two 50# (at 13 psi) fuel injectors and is rated for 490 CFM. The Holley unit was a 670 CFM unit and had two injectors of rated at 85# (at 15psi), and is rated for up to 275 HP.
My '68 318 Engine with the original carburetor was rated at 210 HP, and the only internal changes was the boring it 30 over and adding the Melling cam. So I'm guessing I might be producing up to 215 HP.