Originally Posted by MILD THUNDER (Post 4542752)

It be interesting to see what happens to the bsfc , with changing injector timing. I assume the camshaft events can dictate a need for a change in injector timing? Id think that if the injector timing was based on say a stock cam, and you go to a bigger cam, that opens the exhaust valve sooner, and had more overlap, maybe firing the injector later, so that you arent blowing fuel out the exhaust?

Maybe not much power to be gained here, but maybe some fuel efficiency? Just thinking out my azz on this

Originally Posted by MILD THUNDER (Post 4542754)

This efi stuff is cool chit, i cannot see how you can do all that it can do, by not getting a setup on an engine dyno. How can you do all this stuff by tuning on the water on a custom build? So much that can be tuned. Timing maps, fuel maps, injector timing, knock sensor setup, and so on.

Originally Posted by MILD THUNDER (Post 4542752)

It be interesting to see what happens to the bsfc , with changing injector timing. I assume the camshaft events can dictate a need for a change in injector timing? Id think that if the injector timing was based on say a stock cam, and you go to a bigger cam, that opens the exhaust valve sooner, and had more overlap, maybe firing the injector later, so that you arent blowing fuel out the exhaust?

Maybe not much power to be gained here, but maybe some fuel efficiency? Just thinking out my azz on this

Originally Posted by GPM (Post 4542761)

It takes a while, it's not as easy as some of the salesmen on here claim. Some of the systems are less complicated than others, the parameters have to be set for the marine application. They can be amazing once dialed in, some may throw it in the lake before getting there. Try putting dual wideband 02s on your carb motors, they may not be working as well as you thought.

Originally Posted by hogie roll (Post 4542814)

I've been wondering if injection timing could be used to help push more air in the cylinder. Use something kind of like a miller cycle cam with late ivc and inject when the piston is at or near bdc and the airflow has pretty much stopped. You would need large capacity injectors which could handle most of your fueling needs in a short window of time.

Originally Posted by MILD THUNDER (Post 4542817)

Ive been running widebands on my carb engines for years

Originally Posted by GPM (Post 4542840)

Do you run 1 or 2 sensors

Originally Posted by GPM (Post 4542839)

I'm guessing General Motors had some reason for putting the injectors in the cylinder head of the LS motors.

Originally Posted by MILD THUNDER (Post 4542851)

Currently, I have a single ngk powererdex wideband. I did have dual FAST unit prior to the NGK. On the dynos, I have used the NGK, and Daytona sensors widebands.

My engines bank to bank wise, have never varied more than a couple tenths. I believe that is thanks to the dual carb setups, and straight two lobe rotors. My buddy's with twisted lobes, shows a little bit more difference from bank to bank, but nothing crazy.