DI can tolerate more overlap since it doesn't suffer the same reversion issues being that fuel is sprayed directly into the combustion chambers. That is race car stuff.for a street car I would keep overlap under 12 degrees on a DI motor and under 8 degrees on a PI motor. I certainly wouldn't expect a cam with 21 degrees of overlap to behave like stock. There becomes a point when you introduce enough overlap into the system, you will get some odd behavior that you didn't have when stock. I agree it's likely tuning related and not mechanical, However the GPI stage 4 has A LOT more Overlap then a TSP VVT3. Flycut is a clean and simple clipboard manager for developers and anyone else. Watch this video till end to know the difference between Fly Cutting vs Normal Cutting. Need to make sure that if your tuner left dymanic airflow enabled he tuned the VE correctly. In this video, we demonstrate the Fly Cut technique. I start at 1300 rpm and go down to 850 rpm after 60s in a linear way.Īfter that it could be your virtual torque table off around idle for certain airmass (more airmass engine cold). If your rpm setpoint cold engine is at 800-900 rpm it is going to surge a lot. GPI stage 4 with milled head and no fly cutting must be really close.ĭoes your engine start right away cold ? When I first tuned my cam I had to bump my cranking airmass a lot and of course adjust my rpm setpoint from cold to hot engine.
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