I normally belong down in the RCR section (have an SLC), but this question seems to belong in this area...
We have Sprint Cars in our house. Even years in, I am amazed at the throttle response of these cars. I attribute it to 1) Injection system and 2) Lack of flywheel effect.
For outsiders, Sprint Cars run mechanical injection with stacks, methanol for fuel, and have no flywheel/clutch/transmission/etc. There is simply a U-Joint bolted to the crankshaft.
Obviously the lack of flywheel effect on these cars is part of the great throttle response. Also is part of the high idle speed required to keep it running. But I have had carburetor cars with a light weight aluminum flywheel and they were not close to the Sprint Car even when making similar HP on the dyno.
So if the injection system is a big part of the great throttle response, how much of it is the individual stacks (and huge bores), and how much is the mechanical injection?
For those unfamiliar with mechanical injection, basically the 'correct' amount of fuel is delivered to the injectors, but a bypass bleeds enough fuel back to the tank to keep the engine somewhat happy at part throttle. When the throttle snaps open the bypass is closed, so more fuel is immediately pumped in. They tend to run quite rich at anything other than full throttle - though there are ways to address that if needed.
So my question to those with EFI ITBs is.... Do the EFI ITB setups have awesome throttle response compared to a carb or more traditional EFI?
We have Sprint Cars in our house. Even years in, I am amazed at the throttle response of these cars. I attribute it to 1) Injection system and 2) Lack of flywheel effect.
For outsiders, Sprint Cars run mechanical injection with stacks, methanol for fuel, and have no flywheel/clutch/transmission/etc. There is simply a U-Joint bolted to the crankshaft.
Obviously the lack of flywheel effect on these cars is part of the great throttle response. Also is part of the high idle speed required to keep it running. But I have had carburetor cars with a light weight aluminum flywheel and they were not close to the Sprint Car even when making similar HP on the dyno.
So if the injection system is a big part of the great throttle response, how much of it is the individual stacks (and huge bores), and how much is the mechanical injection?
For those unfamiliar with mechanical injection, basically the 'correct' amount of fuel is delivered to the injectors, but a bypass bleeds enough fuel back to the tank to keep the engine somewhat happy at part throttle. When the throttle snaps open the bypass is closed, so more fuel is immediately pumped in. They tend to run quite rich at anything other than full throttle - though there are ways to address that if needed.
So my question to those with EFI ITBs is.... Do the EFI ITB setups have awesome throttle response compared to a carb or more traditional EFI?