Switching from carburetor to throttle body with direct port injectors, still using the same manifold. On the dyno , with the carb, it liked a 2” open spacer. Is there any reason to take it off for the FI? It will not be going to the dyno again until after the next freshen.
Since there is little to no fuel in the plenum, do the plenum sizing requirements change?
On a conventional four barrel style manifold with injectors in the runner, is there fuel “pullover” from other runners?
Throttle body, conventional manifold?
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Re: Throttle body, conventional manifold?
That all depends on the inlet ducting.bullheaded wrote: ↑Tue Apr 28, 2020 1:29 pm Switching from carburetor to throttle body with direct port injectors, still using the same manifold. On the dyno , with the carb, it liked a 2” open spacer. Is there any reason to take it off for the FI? It will not be going to the dyno again until after the next freshen.
Since there is little to no fuel in the plenum, do the plenum sizing requirements change?
On a conventional four barrel style manifold with injectors in the runner, is there fuel “pullover” from other runners?
It will be different than a carb because the restriction is less.
If it is a regular air-cleaner then there probably isn't much happening there.
If there is a longer duct, it can make a huge difference if the length is right.
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Re: Throttle body, conventional manifold?
Can't speak to the spacer and plenum volume change but I don't see where crosstalk would be much different than a conventional short ram front entrance port injected manifold like this Buick V6. Reversion maybe with a larger overlap cam would have an effect??
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