AVO turbo kit for BRZ - initial build thread

[Tansey86]

Originally Posted by diss7

Removing a cat is not what we're talking about.
You don't want any restriction for peak power, this is why high HP cars have as little exhaust as possible. But back pressue helps spool turbos. When you're talking high HP, using a smaller exhaust to create back pressure to generate spool sooner will act as a massive restriction on peak power.

This is not the case for this setup.

Edit - Prove to me with dyno graphs showing the same car running the same turbo setup, the only difference being a bigger exhuast, that shows the larger exhaust helps spool. Until then I still call BS.

Is a 2.5" system going to be a significant restriction on this kit? No its not. So, use it, as the smaller piping will create more back pressure to help the turbo spool sooner.

Quick google search netted me this result - http://www.dsmtuners.com/forums/turb...provement.html

Not a graph but it provides an outside source on how his power and spool time improved by going from a 2.5" to 3" exhaust.

I completely agree that a 2.5" is fine for this kit, thats not questionable. All im saying is that you DONT want backpressure with a turbo kit, and eventually 3" WILL be an improvement. The higher the HP the bigger the improvement. I mentioned the HFC due to the issue of restriction is results in terms of making power on a turbo application.

[sw20kosh]

Originally Posted by diss7

Removing a cat is not what we're talking about.
You don't want any restriction for peak power, this is why high HP cars have as little exhaust as possible. But back pressue helps spool turbos. When you're talking high HP, using a smaller exhaust to create back pressure to generate spool sooner will act as a massive restriction on peak power.

This is not the case for this setup.

Edit - Prove to me with dyno graphs showing the same car running the same turbo setup, the only difference being a bigger exhuast, that shows the larger exhaust helps spool. Until then I still call BS.

Is a 2.5" system going to be a significant restriction on this kit? No its not. So, use it, as the smaller piping will create more back pressure to help the turbo spool sooner.

Its 2013... The backpressure theory has been debunked. In no way shape or form is back pressure beneficial to FI. In most cases back pressure isn't even useful in NA applications.

I gained 400 rpm of spool upgrading from 2.5" to 3" piping on my Mr2 turbo and had HP gains everywhere.

[SnapOv3st3r]

Turbo need backpressure? Umm...No.

[diss7]

Originally Posted by sw20kosh

Its 2013... The backpressure theory has been debunked. In no way shape or form is back pressure beneficial to FI. In most cases back pressure isn't even useful in NA applications.

I gained 400 rpm of spool upgrading from 2.5" to 3" piping on my Mr2 turbo and had HP gains everywhere.

Was anything else changed at the time?

Alot of 'proof' on this point on the net are dynos where a 3" has been installed and more boost or the tune altered.

By the same theory, going to 4" would be even more benefical, and having no exhaust at all would be better again.

I don't want to further clutter this thread on this point, but happy to discuss further in another thread specifically about this.

Edit - one last point I will make, is consider that 95% of the time you aren't driving on boost. Now, if you're not on boost the car is effectively less powerful than the same car with no turbo attached at all. Whether its rev/load dependant, its going to spool quicker with some back pressure. I'm not at all arguing whether back pressure is needed once there is boost, the point I am making is back pressure is better for off boost and boost transitition (spooling). I would much rather lose a few peak numbers to have the car perform better, in the range that I am using it for 95% of the time. Sure, if the size of the exhaust was robbing 10-20% of peak power, thats a different story.

[Tansey86]

Originally Posted by diss7

Was anything else changed at the time?

Alot of 'proof' on this point on the net are dynos where a 3" has been installed and more boost or the tune altered.

By the same theory, going to 4" would be even more benefical, and having no exhaust at all would be better again.

I don't want to further clutter this thread on this point, but happy to discuss further in another thread specifically about this.

http://www.ft86club.com/forums/showthread.php?t=29525 - In an attempt to avoid " clutter "

[AVOturboworld]

I'll be at the Importmeet.com event at the XXX Rootbeer in Issaquah, WA tomorrow. Boothing it up and showing off the car - spent the day cleaning it and packing.

[sw20kosh]

Why is your FR-S looking so good I just dont understand it!?!?! =)

I really like that vinyl stripe you used on the side of the car. Nice touch.

[brzadmir]

Originally Posted by AVOturboworld

The AVO turbo, UEL manifold, and turbo discharge pipe as a unit weighs 29lbs - the stock exhaust manifold that those replace weighs 20.5lbs. After that, you are adding in the weight of the FMIC and it's silicone hoses. So we are talking about 8~9 lbs in the same location at the engine, then another 28~30lbs for the FMIC portion of the kit.

Sorry guys, do not feel like flipping through the whole forum but, from what i remember reading through the forum is AVO created a UEL header for their turbocharger, can that UEL Header be sold separately? Not looking to turbocharge or supercharge my car, creating a NA build so I'd love to have the UEL Header towards my NA build.

[nataku]

Originally Posted by brzadmir

Sorry guys, do not feel like flipping through the whole forum but, from what i remember reading through the forum is AVO created a UEL header for their turbocharger, can that UEL Header be sold separately? Not looking to turbocharge or supercharge my car, creating a NA build so I'd love to have the UEL Header towards my NA build.

AFAIK the UEL header + the turbo together is what lines up with the OEM header connection. That means the UEL header alone would be offset a bit from where the OEM header connects to the rest of the exhaust.

[cmss2000]

Originally Posted by brzadmir

Sorry guys, do not feel like flipping through the whole forum but, from what i remember reading through the forum is AVO created a UEL header for their turbocharger, can that UEL Header be sold separately? Not looking to turbocharge or supercharge my car, creating a NA build so I'd love to have the UEL Header towards my NA build.

Just look at page one of this thread. It is made to bolt up to their turbo. Even if they sell it to you, it won't be a straight bolt-on. You'll need to fabricate another piece to connect it to your over-pipe.

[brzadmir]

Originally Posted by cmss2000

Just look at page one of this thread. It is made to bolt up to their turbo. Even if they sell it to you, it won't be a straight bolt-on. You'll need to fabricate another piece to connect it to your over-pipe.

So its irrelevant to buy the UEL even if they were to sell it right? Rather off buying a aftermarket UEL headers that's a straight bolt on as opposed to these?

[Calum]

Originally Posted by brzadmir

Sorry guys, do not feel like flipping through the whole forum but, from what i remember reading through the forum is AVO created a UEL header for their turbocharger, can that UEL Header be sold separately? Not looking to turbocharge or supercharge my car, creating a NA build so I'd love to have the UEL Header towards my NA build.

Is this gonna be the most quoted post ever?

Try looking for the Borla UEL header. I don't have any first hand experience, so do your research, but it's the only one I know of.

[brzadmir]

Originally Posted by Calum

Is this gonna be the most quoted post ever?

Try looking for the Borla UEL header. I don't have any first hand experience, so do your research, but it's the only one I know of.

I did my research and if you see for yourself, The Borla UEL header shows to be ineffective reason being there actually loosing WHP. There reproducing the design to make it more efficient. Reason i am not purchasing and i want avos product due to their quality.

[cmss2000]

Originally Posted by brzadmir

So its irrelevant to buy the UEL even if they were to sell it right? Rather off buying a aftermarket UEL headers that's a straight bolt on as opposed to these?

Definitely!