I really want to get the QTEC. Where in the exhaust system would be the best place to put it? After the 2nd cat right?

And if I do this, how much HP gain would I see when the cutout is open?

Thank you!

 

Without a Turbo, you may actually notice little to no significant gain...

I'm planning on running an electric cutout for my FI setup, but there's not going be enough gain/HP to make it worthwhile for a N/A application.

And... you want it as close to the s-pipe as possible... the cat is restrictive, you want to eliminate the most restriction possible, and give the turbo/engine less Backpressure.

 

if you go for it, like he said, put it right at the end of the s-pipe....get as close to the header without being in it...

but wait for FI for any butt-dyno gains

 

i dont really understand? how does an exhaust (cat-back lets say) give you gains and this doesnt?

and lets say I were to put this before the 2nd cat, what would happen to the 2nd O2 sensor, wouldnt it freak out!?

 

you cant because there isnt any space to place it before the 2nd sensor.

you could if u completely take off the spipe and make an extension from the header BUT u still have to trick the 2nd sensor.

 

yea, so im thinking if I put this after the 2nd cat, id get much larger gains than any cat-back exhaust can provide, this just dumps straight out, no constrictive pipes or bends or anything....

but some people are saying otherwise.... do they mean to say that cat-back on an NA tc has no gain as well?

and if nothing, it sounds pretty cool, haha

 

you would gain hp, but you would lose torque is the problem..thats why cat-backs are good, as they still provide an hp increase, but there is plenty of torque still there

thats the only problem...a cut-out is great for something pushing alot of air in and out(anything FI, 4, 6 ,and 8 cylinders)

 

bringing your parts to a dyno shop and doing baselines before and after will answer your question.

everybody here will have opinions on backpressure, piping size, bends etc etc. last time i check 6 second dragster dont have cat's.

 

wait so why will I lose torque?

 

in general any part you install on your car to make it perform better , depending on design will change your power band. you might gain torque and looose top end horsepower. you might gain top end power while loosing some bottom end. etc etc etc etc.

torque is the last thing you want more out of your FWD. torque is the first thing you want when you get a truck.

 

tikbhoy, why dont I want torque in FWD?

lets say I gain some HP and lose some torque, how will I perform in the 0-60 and how about the 1/4 mile...

also... with more torque wont it chirp the tires more easily ?

 

took the words right out of my mouth.

 

uhh... explain...

cat backs offer nice gains on the tc, right?

this should offer even a HIGHER gain... and is MUCH cheaper than a catback...

i just want to know why it doesnt (or that you say it doesnt)

 

why do u not want torque from a FWD? that makes no sense.

 

http://en.wikipedia.org/wiki/Torque

Machine torque

Torque is part of the basic specification of an engine: the power output of an engine is expressed as its torque multiplied by its rotational speed. Internal-combustion engines produce useful torque only over a limited range of rotational speeds (typically from around 1,000–6,000 rpm for a small car). The varying torque output over that range can be measured with a dynamometer, and shown as a torque curve. The peak of that torque curve usually occurs somewhat below the overall power peak. The torque peak cannot, by definition, appear at higher rpm than the power peak.
Understanding the relationship between torque, power and engine speed is vital in automotive engineering, concerned as it is with transmitting power from the engine through the drive train to the wheels. Typically power is a function of torque and engine speed. The gearing of the drive train must be chosen appropriately to make the most of the motor's torque characteristics.
Steam engines and electric motors tend to produce maximum torque close to zero rpm, with the torque diminishing as rotational speed rises (due to increasing friction and other constraints). Therefore, these types of engines usually have quite different types of drivetrains from internal combustion engines.
Torque is also the easiest way to explain mechanical advantage in just about every simple machine.

 

chirp may sound cool but its . it only means one thing, your tires isnt gripping at all.

if you want to perform your best on 0-60 from the dig i suggest practicing at a drapstrip. reaction time and traction is the key to get a good 0-60.

the tc has enough torque for you to even worry about lossing any.

 

Catbacks on a Stock engine, or even one with a header don't offer enough gains to make running a catback or a cutout worthwhile... you "MAY' gain 5 HP, but you will lose torque... which, despite the discussion, is something that you do want a lot of, just learn how to control it.

Big Engines, Say Old school V6's and V8's, which push a lot of exhaust gas, get a worthwhile advantage... along with Turboed Cars, as killing backpressure on a Turbo can get you 15+ hp in many applications.

The tC stock is a relatively moderate 4 banger, which, once you take off the stock restrictive exhaust, has way more flow than the little engine needs... a cut out on top of a decent axleback won't get you more than 4 hp or so... with the stock exhaust still on and running a cut-out (which seems weird), you'd gain a bit more in that one mod... but, still not worth the investment.

I have never seen a stockish car run a cut-out, other than large HP v6s and v8s... a 4 cyl. car has no need and won't gain enough to make the hideous noise worthwhile, and it is hideous without the second cat and resonator, REALLY hideous

You can spend the dough, but you'll more or less come away dissapointed with the result, especially for the cost and horrible noise factor for the HP.

But, what do I know

-WDS