Increase torque

[HiSpec]

Hi,
My friend got a 99 Civic Si, and he was wondering what modification would increase torque, basically low to mid rpm.

Currently he only have muffler installed, no piping done. He is also wondering if he want to increase the pipe diameter from the cat on to the muffler, what pricing is he looking at? He is also considering removing the cat.

Is there actually any aftermarket manufacturers that sells pre-made mid-piping?

Thank you.

[QuasarCav]

You will find alot of options when looking for a cat-back for a honda.

Click on the sponsors link or even put "civic cat-back" into google and you'll have more answers than questions.

They will not provide a noticable increase in torque. The engine is just too small.

[Aleks]

Forced Induction is the only way to add any meaningfull torque to that motor. All the bolt ons you would do would add up to less than 10 ft/lbs

[SaabKraft]

Originally posted by Aleks
Forced Induction is the only way to add any meaningfull torque to that motor. All the bolt ons you would do would add up to less than 10 ft/lbs

true. i think with high revving engines, the piston stroke is shorter than other comparable NA setups, so you won't be able to get much torque from bolt ons (the trade off for higher hp numbers). Unless you're going to mess around with crankshafts, cylinder boring and piston heads, you're going to need forced induction to bring the torque up.

[GTS Jeff]

Originally posted by HiSpec
Hi,
My friend got a 99 Civic Si, and he was wondering what modification would increase torque, basically low to mid rpm.

Currently he only have muffler installed, no piping done. He is also wondering if he want to increase the pipe diameter from the cat on to the muffler, what pricing is he looking at? He is also considering removing the cat.

Is there actually any aftermarket manufacturers that sells pre-made mid-piping?

Thank you.

lol widening your exhaust is the opposite of what you want to do for more low-end torque. People use larger piping for increased top-end. If you use smaller piping than stock you can gain more low-end while sacrificing top-end power. Other things you could do would be to remove the power steering, use underdrive pulleys, and reduce weight like mad.

[asp integra]

start working on the engine, there are so many options to go like cam shafts and all that, if u rebuild the engine with new top quality parts u will gain alot of power/torque

[Darkane]

whatever he does tell him to leave the cat, OBD II cars cant run properly w/o a cat. G/L ... oh and as to yer original post JRSC or small turbo like a garrett 28 or something.

[autospeed]

Originally posted by asp integra
start working on the engine, there are so many options to go like cam shafts and all that, if u rebuild the engine with new top quality parts u will gain alot of power/torque

i'm pretty sure he's looking for bolt ons, within a budget not rebuilding the entire engine. And since its a fairly new car, if the budget does get bigger a bolt on turbo or supercharger kit would be a way better option than rebuilding the engine.

[Euro_Trash]

I don't think I would make a goal of having high torque on a high revving car, I would go for high end horsepower, take advantage of the RPM range

[benyl]

easiest answer is to buy a car with more torque. You can't do shit with bolt ons. You will loose usable torque.

[keith303]

Hi,
My friend got a 99 Civic Si, and he was wondering what modification would increase torque, basically low to mid rpm.

Currently he only have muffler installed, no piping done. He is also wondering if he want to increase the pipe diameter from the cat on to the muffler, what pricing is he looking at? He is also considering removing the cat.

Is there actually any aftermarket manufacturers that sells pre-made mid-piping?

with a full exhaust you will maybe gain 10 wtq which wont even be noticable. tq doesnt exist on that car when not turboed.

[Weapon_R]

Gains with exhaust are subject to interpretation.

Do you think your car is weak off the line? A 3" pipe is going to make it worse. Peak horsepower is not the tell-all, end-all of bolt ons. You need to find out what combination will give you the best gains, where you want them. Installing a cat-back will reduce your power output in one area of your band, and increase it in another.

In your ase, search for something that will help you with your low end.

[Jason Lange]

Originally posted by keith303




with a full exhaust you will maybe gain 10 wtq which wont even be noticable. tq doesnt exist on that car when not turboed.

He won't get near 10 wtq I don't care what exhaust he uses, and if he did gain 10 fwtq it would be noticable. Torque can exist on his w/o a turbo but it means upping the compression and boring/stroking.

[HiSpec]

i told him that simply an exhaust won't do much, if any at all. He doesn't want to spend much, so he prob won't have much choice in modifications.
then he told me a complete full cat back will at least make him sound meaner hahaha....

[Jason Lange]

Haha RICER.

[GTS Jeff]

Originally posted by HiSpec
i told him that simply an exhaust won't do much, if any at all. He doesn't want to spend much, so he prob won't have much choice in modifications.
then he told me a complete full cat back will at least make him sound meaner hahaha....

Why start a thread if you're not going to read the replies?

A bigger exhaust will make you LOSE low and mid range torque.

[Bigchuckers]

I think the cheapest way to increase torque would be a cold air intake. After that, it gets pretty pricey. Increasing your compression ratio is the ideal way (forced induction is a spin off of this), that can be done by shaving your cylinder head a few thousands (keep in mind that will toss of your cam timing a bit so it will need to be adjusted) and its possible you could get your ignition maps optimized (and thus your fuel curves) if he's willing to run premium fuel. But anything exhaust related wouldn't really help the area's you want to.

Put on smaller diameter tires will help acceleration a bit, but the speedo will go out of wack.

[Jason Lange]

Originally posted by Bigchuckers
I think the cheapest way to increase torque would be a cold air intake. After that, it gets pretty pricey. Increasing your compression ratio is the ideal way (forced induction is a spin off of this), that can be done by shaving your cylinder head a few thousands (keep in mind that will toss of your cam timing a bit so it will need to be adjusted) and its possible you could get your ignition maps optimized (and thus your fuel curves) if he's willing to run premium fuel. But anything exhaust related wouldn't really help the area's you want to.

Put on smaller diameter tires will help acceleration a bit, but the speedo will go out of wack.

Forced induction is not a spin off of increasing compression.

[Bigchuckers]

Last time I checked adding boost increased cylinder pressure's much in the same way (well, far greater) increasing your compression ratio does

[Jason Lange]

compression ratio is volume at bottom dead center vs. volume at top dead center and isn't measured by pressure in the cylinder. Although it obviously does increase pressure at tdc with increased ratio.