Aurion performance mod.

[Aurion fi 4]

I bought my aurion in 2015 brand new. Been a top car.

I wanted a little more performance out of it. I have a K&N filter and also just did the exhaust collector mod.  

The standard pipe squishes together and very restrictive right where you want it to flow.  We moved the flex pipe further back and had two pipes into a larger collector

Professional workshop did it and its a top quality job. 

Car goes a fair bit better. 1st gear it just spins the tyres (235 tyres on 17 inch wheels).  Massive axle tramp. Its definately making more torque and power.

It just feels more urgent, like your driving downhill all the time. Might even get fuel efficiency gains

Best thing is it sounds completely stock. 

I will try attach pictures.

[Aurion fi 4]

Standard pipe below..

It basically squishes into half sized pipe. Right up under engine. Has to restrict performance. 

[campbeam 141]

1 hour ago, Aurion fi said:

We moved the flex pipe further back and had two pipes into a larger collector

Professional workshop did it and its a top quality job. 

Looks like a worthwhile modification. How much did this cost and how long did it take for the shop to do it?

[Aurion fi 4]

Took 2 hours to do and $250.  I suspect ill make it back on fuel economy. 

It sounds absolutely standard. 

It seriously breaks traction so easily. Just cruising needs barely any throttle to get up to speed, feels more effortless.

Aurions are not slow to start with but this mod definately turns it up a notch.

[campbeam 141]

1 hour ago, Aurion fi said:

Took 2 hours to do and $250.

Thank you for your contribution to the Forum. Good solution to move the flex pipe back to gain the extra needed space.

The modification is very tempting at that price and worth further consideration.

[Aurion fi 4]

They considered removing flex pipe altogether but i wanted it in. Moving it back was a great resolve. Ill report back if i get more km to a tank.

No sound change at all. Its quiet. No engine check lights or anything negative. Part throttle response is fantastic. 

Only downside i see is in first gear, need to feather the throttle on a fast takeoff,  Needs better tyres now.

 

Edited August 24, 2018 by Aurion fi

[matt36415 16]

Where did you get that done, for $250 its a great mod. Was that friends price or just normal off the street customer?

 

[LordBug 27]

Man, I've really gotta do this!

[GDude 12]

This is something I have planned for my car too. Good to know it's such an inexpensive mod.

[r32dan 0]

They did a nice job. Can you please report back fuel consumption differences? Well done. 

[Aurion fi 4]

Not a friends price. First time i walked into exhaust shop. Pm me and I will provide shops details. 

The negative is you simply cannot floor the throttle from a standing start. It gets axle tramp badly. Need to feather throttle. Go about half throttle and from about 30km/h then floor it. Will still turn the tyres. It wasnt like this standard. So i suspect my car is now making more torque?

I need better tyres now  

I suspect toyota squashed the pipe to limit the low end torque??

Edited August 25, 2018 by Aurion fi

[Aurion fi 4]

I have the car 0-100 at about 5.8-5.9 secs with 3/4 of a tank and very gentle delicate takeoff. Have to gradually apply throttle in first gear. With sticky tyres would be quicker with hard launch.

80-120 in about 3.1secs

All on private roads of course.

 

20180825_175226.mp4

Edited August 25, 2018 by Aurion fi
Uodate

[Aurion fi 4]

This is what happens when you floor it in first gear. Massive axle tramp. Must feather throttle in first.. as per link.

20180825_175130.mp4

[Aurion fi 4]

Another careful takeoff but traction control cuts in up top

20180825_174909.mp4

[Aurion fi 4]

And here is your 80-120.. notice it up top in the rev range. Pulls nice n hard over the stock car.

 

 

 

20180825_174018.mp4

[campbeam 141]

Your comments about axle tramp with this modification got me interested.

I usually drive my 2006 Aurion ATX [198K on the odometer] fairly sedately. ATX is currently fitted with standard size 216/60/16 Pirelli brand tyres which are "as new" with lots of tread depth. Last night, I just happened to be stopped at the front at traffic lights on the local highway so decided to do a fast launch. I may not have had the throttle totally flat to the floor but there was no loss of tyre traction before getting to the 80kph speed limit. 

I think that having new quality brand tyres will make a difference with improved tyre traction.

[Aurion fi 4]

Totally agree about new tyres will reduce my axle tramp / wheel spin. 

But problem was far less before this mod. The standard configuration exhaust seems to limit torque just enough to provide a clean getaway. 

But this mod gives you benefit of extra torque on takeoff and after your getaway right through rev range. I will eventually get better tyres to get my takeoffs effective but as i also drive sedately 99% of the time, i will enjoy this mod moreso for the increased torque / more effortless performance and hopefully fuel economy benefit. 

Edited August 25, 2018 by Aurion fi

[Aurion fi 4]

As for the rest of he exhaust? We inspected it and didnt see much of a restriction at all down the back.

Unless the rear mufflers are severely restricted inside, they didnt look bad at all.

Its far more important to uncork the pipes closer to motor than back of car. The exhaust gasses are much hotter and flow faster the nearer to motor. As they go downstream they considerably slow and cool where restrictions will matter less. If anything you want it to step down in size slightly as it gets to the rear to maintain exhaust velocity.

Also at the moment car sounds absolutely standard, changing rear mufflers could sound nasty or invite drone for little or no gains, especially if you leave front pipe all corked up.

Edited August 25, 2018 by Aurion fi

[ZZT86 36]

Sounds like even more torque from that creamy engine, only problem will be you will fry your tyres that much quicker :) Sticky rubber will help with traction but not tyre longevity ;)

[Aurion fi 4]

Someone else get it done and report back with the results. Show my photo if exhaust shop scratches their head about it.

One exhaust shop said to me, if you want a v8, buy a v8.

Edited August 27, 2018 by Aurion fi

[r32dan 0]

Interesting to see someone do the headers and cats as well!

[campbeam 141]

Have a read of the following closed thread which started in 2009. Reveals a fair bit of what has worked or not worked for other owners.

https://au.toyotaownersclub.com/forums/topic/19248-experimental-exhaust-system/

Modification of the Y pipe has been a centre of attention and where the most gains are likely to be achieved.

Pictures in this thread demonstrate how this has been effectively achieved at a modest cost. It also appeals to me because it is a discrete modification.

[Aurion fi 4]

Yeah read that thread before but no real outcome / conclusion was stated?

Mine is definately going better than standard. I think its not just the bigger collector that removes the squashed pipe restriction but also moving the join of pipes further back helps. Gasses cool as they progress from engine back through the exhaust, the dual pipes merge further back and into a less restrictive collector.

Unfortunately I have not dyno tested the before and after gains but posted videos to evidence it goes pretty good and sounds completely stock.

Edited September 1, 2018 by Aurion fi

[GDude 12]

On 8/25/2018 at 10:35 PM, Aurion fi said:

Not a friends price. First time i walked into exhaust shop. Pm me and I will provide shops details. 

The negative is you simply cannot floor the throttle from a standing start. It gets axle tramp badly. Need to feather throttle. Go about half throttle and from about 30km/h then floor it. Will still turn the tyres. It wasnt like this standard. So i suspect my car is now making more torque?

I need better tyres now  

I suspect toyota squashed the pipe to limit the low end torque??

I suspect you're right about Toyota limiting the torque -- Toyota marketed these cars to a very conservative demographic. Also, the stock tyres aren't up to the extra torque, as you have experienced. To get more consistent acceleration you will need something better like Michelin Pilot Sport 4 or Bridgestone RE003. It would be great to get some before and after dyno results...maybe when I do it...

[Aurion fi 4]

UpDATE

I also have a 3.0 v6 camry. I checked it underneath. It dont have the squished pipe. It has a nice flowing merge. 

Im wondering why toyota intentionally had it squished up for aurion.