Don Terrill’s Speed-Talk

He has already over $16000 in the FI system. Then he is an idiot and got scammed by someone. A full Bosch MS7.4 system, the kind used by WRC and LMP cars, doesn't even come close to $16000 in cost even with a pump, fuel rails and injectors, and all sensors. You can have a top-level motorsport quali...

Well. Carbs do appear to make more peak power as of right now. Pro stock took a power penalty going to efi. But it is an interesting topic as it opens the possibillity some portion of the reasoning for this is still unknown? I also think prostock should allow carburetors back in and let them battle...

Turbos are great for making power and torque on engines but for the manufacturer they add pretty stiff incremental cost increases. They require more expensive exhaust systems and associated hardware. The turbos themselves are also moderately expensive. The turbochargers still tend to start to make ...

Port injection will deliver a finer droplet size and will not displace air volume, but we will not benefit from evaporative cooling. Direct injection would be even more efficient. Why wouldn't it benefit from evaporative cooling? The fuel coming out of a typical port injector will still evaporate, ...

While 1D analysis is a good measuring stick and useful, surely you must realize that the MPH difference isn't about anything magical...it's that Cd varies with velocity. Your Reynolds numbers are going to be changing, turbulence will vary with velocity. So, for example, a ProStock car may have a mor...

it's a lack of interest in Nascar and wildly extrapolating this data and comments from other posters it's a lack of interest in hot rodding and auto racing in general :( . Personally I think it is a combination of the roads getting too crowded, cars getting more complicated so learning about them i...

Maybe a subject for a separate discussion, but I wonder if VE would be affected if you replaced a port injector with a GDI type and bumped up the fuel pressure to what they normally run. Presumably the fuel droplet velocity would be way higher. Unfortunately "bumping up" to 250 or 300 bar...

the horsepower limit /target is 550 with the restrictive spacer with EFI why don't they just run the current production engines?? Both Ford and Chevy have engines that can make 550 HP in NA form First Guess: The manufacturers can sell a 550+ hp engine, in a street-driven vehicle, and warranty it, b...

Port injection will deliver a finer droplet size and will not displace air volume, but we will not benefit from evaporative cooling. Direct injection would be even more efficient. Why wouldn't it benefit from evaporative cooling? The fuel coming out of a typical port injector will still evaporate, ...