Honda Civic Rebirth taking more time to reach to 100 km/h

[anarkaliantiques]

Why u replaced fuel pump and coils ?
Spark plug genuine?
Look like the desi catalytic is consuming more air

It doesn’t make any sense, catalytic is not desi, and it doesn’t consume any air, it’s a mesh structure that burns excess/residual exhaust gases so it doesn’t harm the environment

[ali.qamar.372]

Have u gone through the whole post?
Clearly stated that its not the genuine catalytic
Genuine catalytic has the same mesh as u are saying
But the plates he is defining is the indication of altered catalytic converter
I used it a year ago later my problem was not solving so i sold that car hope so u underatand

[danyalag6]

Can you explain why it is harmful to the gearbox to shift manually in d1, d2, and d3? If it was harmful then the company would not have given the driver the option to shift. Torque converted automatics (like the civic prosmatic) are very resilient and can take a lot of abuse. If you release the accelerator while shifting between d1,d2,d3, and d; it will not cause any damage to the gearbox IMO.

[Thinking]

dear under strain change is a different scenario. besides its not the recommended way of driving an auto car. d1, d2 and d3 are mainly for coming downhill ensuring engine braking and less strain on brakes.

d1, d2, d3 do not add any value while accelerating. its not a manual where u need to switch between gears for acceleration.

D can meet all applications during acceleration anyway.

[danyalag6]

Well, if by strain you mean keeping the accelerator depressed while shifting then I agree with you. And I certainly agree that it is not the recommended way of driving an automatic transmission as doing so will make having an auto trans redundant(like you said, better to get a manual if you wanna shift). But I don't think he will cause any damage to the trans if he follows the proper procedure to shift manually which I outlined in my original post.
Regarding the value of driving the car in d2, or d3, If you are driving in a mountainous area or just driving spiritedly, then it is better to keep it in d2 or d3. Reason being that any automatic transmission will shift into the highest gear if you release the throttle. This makes the car have lag when you depress the accelerator again (because the transmission has to downshift). It is better to keep the car in d2, or d3 to prevent this lag, and this will also reduce wear/tear on the trans as it doesn't have to shift as frequently.

[umairjamil6]

Corect. Manually going from L to D2 etc does no damage. If the car is giving good mileage then its a very difficult task to diagnose because usually car fuel avg also drops if there is any significant issue. Perhaps give the car to some other driver with the same car. He may find something if it drives different

[htb456]

Ever heard of exhaust backpressure/ pressure wave scavenging? It surely seems like that placing any hurdle, such as cat con, in exhaust may reduce the performance however this doesnt happen really. The point is that removing the cat con really hurt the peaks of the engine in this case

[supraman2jz]

What would you say to the fact that manufacturers tune engines (for optimum performance/mileage) with the inclusion of the cat. By removing the cat, would it not disrupt the base map that is saved from the factory?

[zakiuddin]

Exhaust backpressure is an undesirable output of engine. whosoever coined the word Scavenging for this phenomenon did a great job.
Cats were not designed to add performance to an engine and his engine peak is gonna be effected only if he's running wideband variable runners on exhaust tuned with Catcon .

[zakiuddin]

Correct, just like they tune engines with onboard AirCon and Power steering. Removing them would only increase engine performance.
ECU basemap doesnt include backpressure parameters. haven't heard of any backpressure sensors in Petrol cars but Diesels do have some pressure sensors on exhaust side to asssit with DPF management.
Catcons, like EGR and DPF add cost and complexity to engine but are there to protect environment. Car manufacturers had to account them in their design as most of the countries have made them mandatory to meet their environmental emission standards.

[htb456]

For most part you are correct that backpressure is an undersirable output however, there exists an rpm band (usually set around peak torque by OEM) at which the backpressure creates vaccum pulses on the exhaust valve this making it easy for the piston to trhouw out the exhaust gasses and hence increasing the performance. Now if the cat is removed then ECU remap is required to reap any benefit of around peak torque rpm band

[htb456]

ICE are stll in business because of cat cons and other environment protecting machanisms, otherwise the industry would be compelled to switch to electric vehicles much earlier.

[pwuser148289883325]

Get the car tuned up from Honda 3S workshop. The sensors need resetting. Nothing serious

[muhammad.talha3001]

Why are you replying to me? I didn't create the post.