Quote:
Originally Posted by redfire @ RedMM - Is there any thing like this in general? It is because you are not changing the dia of your disc, right? A big dia tyre having a small dia disc will have pathetic braking because of the less stopping power/torque applied on the disc. Otherwise is there anything like this as a theory?
But then why are people going for free flow filters and exhaust to increase low end torque? What I understand, for example, a stock petrol swift with OE air filter and exhaust manifold is never able to catch up one with a free flow filter and good exhaust system with headers. Isn't manufacturers doing this for cost cutting / emission norms, efficiency or detuning? Or are you saying that a moded car is not really having any advantage in low end torque, but just a feeling of it due to more free revving engine which reaches higher RPMs faster than a stock car? I really would like to know as I am planning for a FFE. |
Regarding the braking vs. tire diameter: Assuming that the brake disc/caliper does not change, going to a smaller tire diameter will improve or reduce the stopping distance.
I know I am starting to sound like a broken record because I am stubbornly repeating myself regarding low end torque. But I will stick to me earlier assertions that NONE of the performance mods mentioned will improve low end torque or driveability. Conversely all the the mention mods, whether it be, ECM, headers, cotton gauze air filter, fuel pressure, cold air induction, only serve to improve MAX power which is in the higher RPM range (typically > 3000 rpm). So trying to figure out how to regain the lost low end torque is a bit funny since you just did mods to eliminate it.
Modern cars are tuned by the factory to run most efficiently at very low rpm for economy reasons. What do I mean by low rpm? Just above stalling, which is about 1000 rpm to about 2000 rpm. Think about how you drive when you are about to run out of fuel and there is no fuel station in sight. You barely keep the motor rpm above the stall point and have a very light foot on the accelerator: This is what manufacturers tune the motor to run at, and base their fuel economy numbers on.
So to answer your question, yes modded cars do not have any advantage at low end torque. |