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12-19-2013, 11:47 PM | #1 |
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Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012
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tooter's exhaust experiment...
Up to today, all of the before and after tooter intake manifold dyno runs were with Garm's MagnaFlow center exit exhaust installed. My wife wanted her car a little more quiet, so Scott sold me a nice stock Toyota axleback exhaust, and I put it on the car. It seemed to me to run just fine, but my wife who drives the car more said that it seemed sluggish.
So I got curious enough to do an experiment today, and took the car down to Harry's dyno shop at 15020 Oxnard Street in Van Nuys. (818) 908-9650 It's just East of Sepulveda Blvd. a few blocks. We did a couple of runs with the only change being the stock axle back exhaust, and there was quite a difference. The difference between summer blend and winter blend accounts for some of the difference, because my gas mileage drops about 2 mpg in the winter. But even disregarding that it still made a considerable difference. Needless to say, I put the MagnaFlow back on today. Greg |
12-20-2013, 12:07 AM | #2 |
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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.
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12-20-2013, 12:37 AM | #3 |
0-60 in slow
Drives: light blue liftback Join Date: Aug 2009
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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. |
12-20-2013, 01:02 AM | #4 | |
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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 Quote:
We looked at both charts SAE corrected and the difference was still 7 horsepower. Greg Last edited by tooter; 12-20-2013 at 01:19 AM. |
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12-20-2013, 01:07 AM | #5 | |
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Quote:
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 Last edited by tooter; 12-20-2013 at 01:27 AM. |
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12-20-2013, 10:03 AM | #6 | |
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Quote:
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
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12-20-2013, 11:56 AM | #7 |
0-60 in slow
Drives: light blue liftback Join Date: Aug 2009
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I can't imagine their pulling the data from a front o2 sensor, or a thread in Wideband sensor. Most dyno shops use a wire sensor that sticks into the back of the tailpipe.
Given the rest of the engine is fairly stock, I'm gonna go with there was an exhaust leak at the axle back joint. Exhaust leaks don't hurt performance by affecting AFR they hurt performance because an exhaust leak creates turbulent air flow which restricts flow in the tube. Even small exhaust leaks can cause huge losses of power. |
12-20-2013, 12:38 PM | #8 | |
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Quote:
We did use a tailpipe sniffer for the A/F reading, and it was likely indicating a problem that did not actually exist, because there were no other negative symptoms like rough idle, thrown codes, bogging down, etc. The engine ran good, just not as good as with the MagnaFlow exhaust. Greg |
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12-20-2013, 12:39 PM | #9 |
Angry Bird
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12-20-2013, 12:56 PM | #10 |
dude... He sells them (not sure if he has any left).
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12-20-2013, 03:49 PM | #11 |
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tooter, if you dyno again, try it with no axle-back at all. Just for me.
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
12-20-2013, 06:24 PM | #12 |
Drives: 2002 JDM Vitz 1.3 Join Date: Feb 2013
Location: Antigua & Barbuda
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Where can I can just the intake section with the MAF bracket?
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12-20-2013, 08:46 PM | #13 |
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^ eh?
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
12-20-2013, 10:19 PM | #14 |
Takes corners too fast!
Drives: Absolute Red 2009 Yaris HB Join Date: Apr 2012
Location: Columbia, SC
Posts: 830
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that is how i felt but i just wasn't sure how to respond
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mods:15''Drag DR21 w/Nitto NeoGen 205/50R15, Tanabe DF210 lowering springs 1.6/1.8, TRD Rear Sway Bar, Tanabe Front Sway Bar, Micro Image Short Throw Shift Kit (both in and under), 8.64lbs flywheel, F1 Stage 4 Clutch, AEM Cold Air Intake (Red), Megan Racing Header, DC Sports Axle Back Exhaust, Micro Image Crank Pulley, NST lite Alternator Pulley, ARP Manifold Stud Kit,Tanabe Front Strut Tower Brace, ScanGuage II, Micro Image Silicone Radiator Hose Kit (Red), NRG Carbon Fiber Shift Knob (round), 2009-2011 Toyota Yaris Liftback Foglight kit, NRG Grounding Kit (Red), Hella Horns(Red),CF Hood |
12-20-2013, 11:26 PM | #15 |
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Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012
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I bought a used Simota intake, sold the filter, and chopped off the front end short to fit the oversized velocity stack filter. This particular intake tube flares out to fit the larger 1ZZ throttle body so that's why I used it.
Greg Last edited by tooter; 12-21-2013 at 12:14 AM. |
12-20-2013, 11:48 PM | #16 | |
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Quote:
The next dyno runs will be with the tooter I.V spacer, and it will be done with the center exit exhaust because I already have the stock manifold dyno runs with the same exhaust to compare it to. Greg |
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12-21-2013, 12:20 AM | #17 |
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Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012
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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 |
12-21-2013, 07:49 AM | #18 |
Drives: 2002 JDM Vitz 1.3 Join Date: Feb 2013
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Thanks much Tooter
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