exhaust systems

[japle]

I do believe there is a thread for this topic, but i cant seem to find it, so i will just ask here, i am driving an automatic 1.5 bone stock, except for the H&R sport springs and whole lot of UR bars, what would be the best combination exhaust for low and mid range power / torque?

[tk-421]

Honestly, OEM is the best for low end power. Any aftermarket axleback should give you slight mid and high end power, but tread carefully if you really don't want to lose too much torque on the low end.

[japle]

Problem is i am losing power on the whole band.... torque is very unstable. Seems like the car has got a unstable pms. Sometimes there is power, sometimes she feels like sleeping.

[willygoodness]

try an engine ground cable kit thingo. made a difference to may engine acceleration through the revs from 2000 to near redline

[cali yaris]

Start with an axle-back, see how you like it, then add a header if you want more top end.
Tanabe Medalion Touring is my favorite exhaust for this car ever, but we also carry DC Sports, Megan, Nitto, etc.

I will respectfully disagree with tk-421. Here is a recent dyno showing that an axle-back can make more power THROUGHOUT the power range, including low end:
(thanks to tooter for going to the trouble and expense of dynoing his car and posting the results)

[tooter]

I think that chart represents the approximate gain you would get for any of the axle back exhaust systems that use a 2.25" pipe with a 2.25" core muffler even if they are shorter than this one...

[japle]

so what you are saying is that i change my piping to 2.25? what else do i change? i am bone stock. do i mess around with a rear cat delete?

[japle]

Originally Posted by tooter

I think that chart represents the approximate gain you would get for any of the axle back exhaust systems that use a 2.25" pipe with a 2.25" core muffler even if they are shorter than this one...

axleback is just this section? i dont get the definition

[japle]

Originally Posted by willygoodness

try an engine ground cable kit thingo. made a difference to may engine acceleration through the revs from 2000 to near redline

i might have found a small problem, my airfilter was clogged.... after washing it, the response was slightly better, but still.....

[tk-421]

Originally Posted by cali yaris

Here is a recent dyno showing that an axle-back can make more power THROUGHOUT the power range, including low end

Were those dyno runs measured on a "bone stock AT Yaris" by any chance?

I've read multiple reports from members complaining about low end power loss after an axleback swap with no other exhaust mods. All I'm saying is that opening up the exhaust on one end without making up for it on the other end is less likely to give worthwhile results.

To the OP: The way I was personally able to avoid losing low end power was to make the car lighter and swapping pulleys first. Only after doing that did I feel comfortable moving on to the exhaust. Personally I had great results starting from the front, so i started with an SRI, then the 1ZZ throttle body, then header, and finally a custom exhaust with 2.25 piping from the resonator back.

Obviously, I'm not saying "don't get an exhaust", just take the time to read some posts about some people's experiences and do it right the first time. Otherwise it's almost not worth it IMHO (althought the looks and deeper sound are very nice extras).

[cali yaris]

<<Were those dyno runs measured on a "bone stock AT Yaris" by any chance? >>

I'm not sure how that's relevant. What matters is what was changed on the car between the runs. The only thing that was changed was the axle-back exhaust. The gains are clearly proven.

[tooter]

Originally Posted by japle

axleback is just this section? i dont get the definition

Yes.

Axle back is just the section of the exhaust system behind the rear axle, and actually bolts on just in front of the rear axle.

If I were you, I wouldn't mess around with any of the rest of your exhaust, except perhaps an exhaust header right behind the engine. Those also don't require any cutting or welding and are relatively simple to install. This is my Weapon R header...



It's a beautiful design, even though no one ever sees it.

Many different axle back exhausts are available, and the nice part is that all of them are very easy to install as they just bolt on and use all of your existing stock rubber hangers.

The Tanabe Medalion Touring axle back exhaust is especially nice and has a really mellow tone.


Greg

[tooter]

Originally Posted by tk-421

Were those dyno runs measured on a "bone stock AT Yaris" by any chance?

I've read multiple reports from members complaining about low end power loss after an axleback swap with no other exhaust mods. All I'm saying is that opening up the exhaust on one end without making up for it on the other end is less likely to give worthwhile results.

That's an excellent point, tk.

The stock Yaris muffler has a pressure operated valve inside of it which provides more backpressure for better low end torque, and then opens up at higher rpms for better top end horsepower. I really didn't think it would hurt my engine's performance and got curious enough to find out. The dyno told the tale... a definite loss across the board. So my wife will just have to get used to the sound.

While my engine block is totally stock with no tuning and stock ECU, the comparative dyno runs were all done with exactly the same bolt on parts with the axle back exhaust as the only change.

Equipment used in both dyno runs:

BLOX velocity stack air filter with short ram intake tube.
Corolla 55mm 1ZZ throttle body
tooter et aluminum intake manifold
Weapon R 4-2-1 exhaust header

[japle]

Originally Posted by tooter

Yes.

Axle back is just the section of the exhaust system behind the rear axle, and actually bolts on just in front of the rear axle.

If I were you, I wouldn't mess around with any of the rest of your exhaust, except perhaps an exhaust header right behind the engine. Those also don't require any cutting or welding and are relatively simple to install. This is my Weapon R header...



It's a beautiful design, even though no one ever sees it.

Many different axle back exhausts are available, and the nice part is that all of them are very easy to install as they just bolt on and use all of your existing stock rubber hangers.

The Tanabe Medalion Touring axle back exhaust is especially nice and has a really mellow tone.


Greg

problem is that in malaysia, nobody seems to sell the tanabe exhaust or the header. only cheapo china made headers which arent even equal length are for sale.

[tooter]

Originally Posted by japle

problem is that in malaysia, nobody seems to sell the tanabe exhaust or the header. only cheapo china made headers which arent even equal length are for sale.

That's too bad... I sometimes see really neato aftermarket parts available in Japan that no one will ever get here in the US. Europe gets super economy 6 speed manual trans diesel Yaris' that we'll never see.

Can you buy online through ebay? They're a real convenient way to get stuff from outside the country as they automatically take care of the currency conversion.

Greg

[japle]

Originally Posted by tooter

That's too bad... I sometimes see really neato aftermarket parts available in Japan that no one will ever get here in the US. Europe gets super economy 6 speed manual trans diesel Yaris' that we'll never see.

Can you buy online through ebay? They're a real convenient way to get stuff from outside the country as they automatically take care of the currency conversion.

Greg

The thing i really wish is to get JDM 1.5 4WD system that is only available in japan, either that or the british 1.8 that is only available there.

Ebay items are overpriced. I rather get it through japanese websites, but problem is that some sellers dont do international

[BEEF]

I'm pretty sure garm will ship wherever though i don't know how customs or taxes would be.

Several of us have done resonator back exhausts. just after the resonator is where the exhaust shrinks from 2" to 1.75". I went with a mandrel bent 2" exhaust with a glass packed muffler. I don't have any dyno sheets but am happy with it. it did require welding though.

[japle]

Originally Posted by BEEF

I'm pretty sure garm will ship wherever though i don't know how customs or taxes would be.

Several of us have done resonator back exhausts. just after the resonator is where the exhaust shrinks from 2" to 1.75". I went with a mandrel bent 2" exhaust with a glass packed muffler. I don't have any dyno sheets but am happy with it. it did require welding though.

Can you post a picture of it? I mean the picture of the exhaust