tooter's exhaust experiment...

[cali yaris]

Sweet! Maybe we should make more of those.

Another important factor is temperature (I think more important than the gas blend, actually). If it was colder out this time, you'd make more power as well.

[xnamerxx]

Why is your AFR in the 14s?

Looks like there is a massive exhaust leak in there somewhere and given that line corresponds with the lower power output I'd be looking at an exhaust leak.

[tooter]

Originally Posted by xnamerxx

Why is your AFR in the 14s?

Looks like there is a massive exhaust leak in there somewhere and given that line corresponds with the lower power output I'd be looking at an exhaust leak.

There were absolutely no changes made upstream on the exhaust system. Everything is tight, the engine idles rock steady and smooth, and there are no codes. Exactly the same tooter et intake and 1ZZ throttle body.






I don't know why it's lean with the stock exhaust. The only thing that's different besides the axle back is the winter blend gasoline. I can tell it's different because the gas mileage takes a hit. The only way to know for sure would be to do another dyno run in the summer.

Greg

[LuisPRTRD]

Originally Posted by tooter

Greg

I need this manifold

[tooter]

Originally Posted by LuisPRTRD

I need this manifold

Hey Luis,

I recently got another Corolla manifold to make into a tooter, but the parts to make it won't be machined until next year. When it's built it'll be $575 including shipping and will look just like this one.









These are the dyno runs...

Red: stock intake, 46mm stock throttle body
Blue: tooter intake, 46mm stock throttle body
Green: tooter intake, 55mm 1ZZ throttle body





Greg

[tooter]

Originally Posted by cali yaris

Sweet! Maybe we should make more of those.

The dyno test is a nice selling point, Garm.

I added a stainless steel resonator tip to mellow out the sound even more. Now it sounds like a Borla...

http://youtu.be/FL4CcjF8Z18

Another important factor is temperature (I think more important than the gas blend, actually). If it was colder out this time, you'd make more power as well.

Ironically, the run with the MagnaFlow was done on a 93 degree day and the run with the stock exhaust was done on a 63 degree day.

We looked at both charts SAE corrected and the difference was still 7 horsepower.

Greg