Camry V6 header problem the same as ours?

[apg39]

Hey guys,

Over at TOCAU (Australia) we've got a issue with the Aurion (Camry)'s headers....

Where the front & rear header pipes meet just before the cat, they are both squashed right down to fit. Imagining this wont be too good for flow.

What I want to know is - have you guys a) got the same thing & b) done anything about it or know of a aftermarket product to fix it.

At the moment were trying to figure out a solution such as cutting that section out, installing a new straight pipe from the front header & cutting a scallop to weld on the rear header. Essentially like a sideways 'Y' pipe.

Pic:

[darksparkz]

Yeap.

Exactly the same for us.

I noticed when the car was jacked up when I was getting my exhaust installed. After seeing that bad bend, I almost heard in my head all the horsepower that wanted to get out of there.

Aftermarket, none so far.

Custom, very possibly, some exhaust shops should be able to create mandrel bends all from header back to exhaust out. But most of us don't exactly want to do a mod like that due to the cost verus how much actual performance will be gained.

Be a pioneer =)

[BlackCamSe]

what i dont understand is if toyota wanted to make a dual exhaust. why not run one pipe for each header. That would eliminate that horse power robing bend, and the y split in the back. It looks like they made a half-assed dual exhaust.

[apg39]

Originally Posted by XxTrD_ToYoTaxX

what i dont understand is if toyota wanted to make a dual exhaust. why not run one pipe for each header. That would eliminate that horse power robing bend, and the y split in the back. It looks like they made a half-assed dual exhaust.

Yeah its a bit of an uninspiring system. A few people at TOCAU have looked at a full 2-2 14" system but the costs are a bit of a turn off.

[njerald]

Originally Posted by XxTrD_ToYoTaxX

what i dont understand is if toyota wanted to make a dual exhaust. why not run one pipe for each header. That would eliminate that horse power robing bend, and the y split in the back. It looks like they made a half-assed dual exhaust.

Really?

What part of $$$$$$ don't you understand?????

[BlackCamSe]

Originally Posted by njerald

Really?

What part of $$$$$$ don't you understand?????

when are you going to grow up and stop correcting me?

[PRINCESS PEACH]

theres a shop in LA that does custom headers + downpipes, all mandrel and professionally done. they're quite famous for their work actually, esp at the drag.

i'm sure you can find a place in aus.

[darksparkz]

Just to add to a slightly old thread.

I've thought about it, and that it's possible that Toyota purposefully designed it to create more pressure when the exhaust gases meet at the intersection, that way, they increase velocity in the pipes and control back pressure.

From a bit of searching: "EGR gasses to the cylinders can become unequal at lower gas flow rates (low speed & light load conditions) due to exhaust gas pulsations resulting from the unequal pipe lengths. This tuning via pipe restriction mentioned above, can directly improve EGR flow"

This problem exists in many V6 cars apparently, including the Maxima and Altima. I've emailed a few companys on whether they'd be willing to create a new mandrel bent y-pipe for us anyways though.

[Netforcer]

Originally Posted by darksparkz

Just to add to a slightly old thread.

I've thought about it, and that it's possible that Toyota purposefully designed it to create more pressure when the exhaust gases meet at the intersection, that way, they increase velocity in the pipes and control back pressure.

From a bit of searching: "EGR gasses to the cylinders can become unequal at lower gas flow rates (low speed & light load conditions) due to exhaust gas pulsations resulting from the unequal pipe lengths. This tuning via pipe restriction mentioned above, can directly improve EGR flow"

This problem exists in many V6 cars apparently, including the Maxima and Altima. I've emailed a few companys on whether they'd be willing to create a new mandrel bent y-pipe for us anyways though.

I've been planning on this mod since last year, but decided on switching up the muffler instead... hopefully i'll be able to get to it this spring or summer.

and they are equal length, that's why they have a u-bend on one of the pipes before they meet, but yes, it's there to control back pressure

[Netforcer]

Originally Posted by Paul

theres a shop in LA that does custom headers + downpipes, all mandrel and professionally done. they're quite famous for their work actually, esp at the drag.

i'm sure you can find a place in aus.

Lucky 4-bangers who don't need to worry about this issue... that's y they cost less in the long run for performance... remember i was talking about my y-split that made my custom exhaust more than yours? well we got another y-joint up in the front... ghey... hahaha if only toyota went back to an inline-6

[Supercharged TRD]

I am putting my car in at an exhaust shop next week and see what they have to say. The owner reckons he can do up an exhaust system that will give +20kW (+26HP) at the flywheel. I don't know how much it will cost yet. Alternatively, I could buy 4 TRD stickers that will also achieve the same effect.

[Eye8Pussies]

pretty much all the v6's out there even from many years ago have had this problem, starting from and including the gen3 camrys and the maximas from the same years as well

it was teh maxima guys who started the custom y-pipe thing it seems and then the camry guys also got into it- the only down side was that since so few camry guys were willing to pay to get performance, it was extremely expensive. In toronto, there was on shop that made a proper y-pipe for the camry and that was Ultimate Racing, and they only made 3 at a cost of about 800CND each at the time (8 years ago?). I was lucky enough to snag one used from Ratko when he parted out his car years ago. But yes, the y-pipe is hard to design properly because for best performance, the runners have to be equal length to prevent turbulence and a longer collector prevents the loss of torque.

[darksparkz]

Originally Posted by Eye8Pussies

pretty much all the v6's out there even from many years ago have had this problem, starting from and including the gen3 camrys and the maximas from the same years as well

it was teh maxima guys who started the custom y-pipe thing it seems and then the camry guys also got into it- the only down side was that since so few camry guys were willing to pay to get performance, it was extremely expensive. In toronto, there was on shop that made a proper y-pipe for the camry and that was Ultimate Racing, and they only made 3 at a cost of about 800CND each at the time (8 years ago?). I was lucky enough to snag one used from Ratko when he parted out his car years ago. But yes, the y-pipe is hard to design properly because for best performance, the runners have to be equal length to prevent turbulence and a longer collector prevents the loss of torque.

That is one of the shops I contacted to see if they'd be interested, because I did a search and showed that they did create y-pipes with flex pipes for altimas and maximas, as well as a few test ones for the 1MZ Camry

[BlackCamSe]

Couldn't we just eliminate a split in the exhaust completely if we ran 2 separate exhausts? I mean one for the front bank, and one for the rear bank? But that would eliminate one of the cats.

[Netforcer]

Originally Posted by XxTrD_ToYoTaxX

Couldn't we just eliminate a split in the exhaust completely if we ran 2 separate exhausts? I mean one for the front bank, and one for the rear bank? But that would eliminate one of the cats.

you need to change that avatar statement unless you're being sarcastic... of course you can eliminate the split if you go true dual, but you'd need smaller piping, and extra cat, if still want it... but you'll still need to use an x-pipe to equalize the pressure and flow