Hello out there, first time asking for help on the forum
LS7 new build for road racing. Using an E40 ECM with a tune for the same engine before it was pulled out and rebuilt. Made some changes to the engine, raised compression, higher lift cam, more duration.
Couldn't get the car to start. Would fire and die consecutively time after time no matter what I did to the starting or running air flow parameters. After testing a lot of things, I was at wits end and tried venting the intake by unplugging the vacuum hose from the brake booster and the car fired right up, so I'm assuming it was starving for air.
Just for a quick test I re attached the vacuum hose and drilled 2 - 1/4" holes in the throttle body butterfly and the car starts and runs perfect but I know this is just a band aid. Any thoughts?
Thanks in advance.