Nascar restrictor plate question?
With the change to fuel injection how will a "restriction" be put on the cars for Daytona and Talladega. I'm guessing that the rate of injection will be reduced, but did Nascar just create a problem that wouldnt have occured without change?
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Restrictor plates restrict air flow ... not fuel flow.
Fuel injection may create more power due to better fuel/air atomization [mixture], so that may require a reduction in restrictor plate sizes to reduce speed in order to keep the cars on the ground should a car spin around backwards on the track going 200 mph
They're still going to use a plate. The system they're using the throttle body will mount on top of the intake manifold just like a carb. The plate will do the same thing, reduce the amount of air allowed into the engine. Less air means less fuel for the air/fuel mixture which means less HP. Will work the same way as the current way, just a different way that the fuel is put into the engine.
http://www.nascar.com/news/111018/inside-nascar-fu...
If you click that, that will tell you anything you probably want to know. 2nd diagram shows the basic FI system, if you look it still has the plate.
They can still use a restrictor plate, because they are basically using throttle body type injection and putting the injectors in the intake manifold runners and not using port injection, so there won't be much of a change to the restrictor plate. The plate will still be between the throttle body, and intake manifold, and before the injectors