I enjoy my Corolla’s electronic fuel injection system, good mpg & power, and it is pretty much bullet-proof. But my prior VW Rabbit’s CIS mechanical fuel injection – definitely not bullet proof – but imo was more responsive to the gas pedal. Engine responded immediately when gas pedal depressed. …

There will always be some inherent delay in anything software controlled (latency even in real-time software controls). However, this should be so small as to be almost unnoticeable to humans unless there is some purposeful reason for adding in additional delay. Software makes this easy, not so easy…

I was speculating that perhaps the CIS was more responsive b/c there’s a direct mechanical linkage between the air flow sensor & the fuel flow rate. With CIS, throttle valve opens, air flow into engine increases, air flow sensor mechanically linked to valve which increase fuel injector flow. The C…

[image] George_San_Jose1: More steps, more delays, esp the delay between air rushing into manifold and manifold pressure rising enough for the computer to increase fuel flow. It’s not a delay. I think it’s a deliberate design to keep the fuel mixture at the correct ratio even during quickly c…

[image] TheWonderful90s: I’m guessing the mechanical fuel injection responds too quickly by injecting more fuel even before the air pressure in the manifold has a chance to catch up. This is a good point. It could be the older mechanical injection system provided behavior similar to a carbur…

[image] TwinTurbo: There will always be some inherent delay in anything software controlled (latency even in real-time software controls). There should be ZERO delay unless you’re using a chip designed in the 90s, especially with off the shelf processers that can easily do over 10 BILLION ins…

Good ideas. Trading off throttle responsiveness for a cleaner burn & less air pollution seems a reasonable compromise , esp for an econobox daily driver like a Corolla. I doubt the delay is caused by the computer’s inability to process the data quickly enough; as suggested above, the delay is prob…

That has to be the most naive statement I’ve seen you make on this site. However, since your background is essentially system level software, it doesn’t surprise me. If you had any background in real time, software based embedded programming you would have understood what I wrote and that ANY proces…

[image] TwinTurbo: That has to be the most naive statement I’ve seen you make on this site. However, since your background is essentially system level software, it doesn’t surprise me. If you had any background in real time, software based embedded programming you would have understood what I wr…

My money is on the fact that the Corolla transmission is not as responsive. The issue isn’t throttle response, it’s driveline response. It’s why I dumped Hondas and Toyotas after many years. The Mazda drivelines are much more responsive to driver input and I think it is almost entirely the use of…

One problem with that, OP’s Corolla is a manual transmission, IIRC but could be wrong his VW was a manual also…

Most responsive fuel injection: mechanical or electronic?

General Discussion

Mustangman August 18, 2023, 10:41pm 26

A heavy flywheel will do this, too. Heavy flywheels smooth out 4 cyl vibrations and help launch the car from a stop, but they slow the throttle response… up and down the rpm scale. If the VW had a lighter flywheel, it would feel more responsive.

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Most responsive fuel injection: mechanical or electronic?

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