TTE Exhaust - Turbo restrictions

[Petrus]

Or ask Malian to make their centre exit lotus style one with just one back box.

That already exists.





The issue is that space limitation then dictates a very slim ´box´.
Also; any such style exhaust has the extra bends and rerouting of heat; form before function.

If you source an old OEM box, you have the flange and bends ready made.

[Petrus]

As a perspective here the Fujitsubo solution. It has a free flow main box, a resonator and an additional absorbtion damper:





The data according to the manufacturer:

Intermediate acceleration   
Stock: 3.1 seconds -> Fujitsubo: 3.0 seconds

Maximum output   
Stock: 97.6kw (132.8ps) / 6180rpm -> Fujitsubo: 101.2kw (137.6ps) / 6270rpm
Maximum torque   
Stock: 170.5N · m (17.4kg · m) / 4290rpm -> Fujitsubo: 173.5N · m (17.7kg · m) / 4240rpm

Weight   
Stock: 12.6kg -> Fujitsubo: 11.4kg

Volume idling   
Stock: 68dB -> Fujitsubo: 68dB
Middle RPM Sound   
Stock: 83dB -> Fujitsubo: 83dB
High RPM Sound   
Stock: 93dB -> Fujitsubo: 94dB
Mid RPM Acceleration Sound   
Stock: 99dB -> Fujitsubo: 101dB
 

[Gaz2405]

Or ask Malian to make their centre exit lotus style one with just one back box.

That already exists.





The issue is that space limitation then dictates a very slim ´box´.
Also; any such style exhaust has the extra bends and rerouting of heat; form before function.

If you source an old OEM box, you have the flange and bends ready made.

Brilliant that's the one I'm after....

[Petrus]

Here some more wonderfully creative solutions:



and my absolute favorite:

[Petrus]

Brilliant that's the one I'm after....

Be warned that it is LOUD. It has minimal abosobtion damping only.

Also, the cat is the main restriction.

[Gaz2405]

Thanks I have a 200 cell high flow cat.

[Petrus]

Thanks I have a 200 cell high flow cat.

With turbo and cat you can get away with less muffling.

[thetyrant]

Im going to build a rear silencer for mine using 2.5" pipe/bends and universal silencer either from ebay or https://jetex.co.uk/custom-exhaust-parts/ , also might go mild steel rather than stainless as its easier for me to fabricate and cheaper as well as being better at absorbing sound, lifespan will be good enough im sure as its not hanging down under the car like a front engine setup.  Ive priced it up around £150 for parts i would use depending how big silencer i go with.

[Petrus]

Im going to build a rear silencer for mine using 2.5" pipe/bends and universal silencer either from ebay or https://jetex.co.uk/custom-exhaust-parts/ ,

I have used their mufflers for DIY on three cars now. Good, durabele stuff but HEAVY. They also have a decibel reducer insert.
Because of the weight I opted for a motorcycle muffler but that has sofar bitten me in the bum.

[Bugster_MR2]

I have a mint condition Team Moon duals catback sitting on the shelf. Will it give my TTE turbo (currently with TTE catback) any more ponies, or is the main cat the serious restriction?

You have a team moon? Where'd you get that from?

The main cat is the biggest restriction. No point changing backbox without changing cat first.
So, might as well sell the team moon to me

It was on my first MR2 that I bought in 2008. In 2009 I converted it to 2zz with a PPE racekat and MWR header. These three pieces combined made the noise levels unbearable. Would never pass the inspection overe here in Norway. I bought a brand new TTE twin back then, which reduced the noise to perfect level in my opinion.

Had the Team Moon lying here since then. I think I want to try it on my TTE turbo now.

[Bugster_MR2]

It has a magnaflow muffler btw.

[tets]

This isn't a great pic but that's the sport cat wrapped and then straight out

[shnazzle]

This isn't a great pic but that's the sport cat wrapped and then straight out

Haha! Damn. That's dedication to max flow and early onset deafness

[tets]

Haha! Damn. That's dedication to max flow and early onset deafness
[/quote]

I was surprised how "quiet" it was when I fired it up to put on the trailer and then get it off and drive it into my unit!!
 

[BahnStormer]

As a footnote I am not convinced the TTE flows any better than stock, most likely it flows less. With the noise regulations as the given and TTE being a dealer option, it is not complicated to think through why.

The twin exit is less muffler per exit, so balances out to noisier, but very similar flow - I'm pretty sure the flow similar to stock: I hope so as I declared mine on the insurance, but as a non-performance mod. My main justification is that the TF300 cars were still rated to the same power and I genuinely don't think it makes any performance improvement at all... it's a weight penalty, so the car is arguably a tiny little slower, but it just has a lovely meaty burble and once you get it up to temp there's sometimes some nice little pops too.... I got it because the soundtrack makes me smile, not because it makes the car faster.

I wouldn't put it anywhere near a 2ZZ or a V6 as you're needing to flow at least 40% more gas (40% higher RPM or 50% more cylinders), so it will start to become really restrictive pretty quickly.... I'm sure it does limit forced induction 1ZZ's, but less obvious/easy to say by how much.

Back to Scotte's comment - 230bhp should be plenty, even for track use and unless you're planning on a re-enforced gearbox, custom internals and a LOT of extra cooling mods, you're never going to reliably get much over ~220whp out of a 1ZZ and you're pretty much on that already!

[Petrus]

I was surprised how "quiet" it was when I fired it up to put on the trailer and then get it off and drive it into my unit!!
 

Well, you have not revved it at full bore yet??
Th sports cat does not muffle much; just a bit of energy losses in flow friction and heat absorbtion but not the least bit of moderating the waves nor pulses.
It shoúld be louder than a decat with absorbtion damper and that is LOUD.

The Magnaflow is as I understand it an expansion chamber and absorbtion damping combined on a ´straight though´; max muffling while not impeding flow. Too loud even on a cat to get through periodic inspection but in mý opion ok on the road. Just be sensible with the pedal.

Again; a turbo changes things a bit; louder because of bigger bangs but recycling a lot of the energy in the exhaust gasses.

Lóve the wonderful creativity of the not off the peg solutions!!!

[shnazzle]

That is indeed the most mental exhaust system I've seen on a road-used mr2. 
I thought decat pipe was hardcore... That's childplay compared to this. 
Why not go whole hog and just do away with the cat?  
Manifold straight out the back

[Nvy]

That is indeed the most mental exhaust system I've seen on a road-used mr2.
I thought decat pipe was hardcore... That's childplay compared to this.
Why not go whole hog and just do away with the cat?
Manifold straight out the back

I think tets has a turbo but not sure

[tets]

I think tets has a turbo but not sure
[/quote]

I do indeed have a turbo - bought as a project car but i'm not sure the shell is worth saving now i've got it to the unit and up in the air.

I've got to say when I first saw the exhaust I immediately thought ASBO car but was very surprised when I fired it up. When I took it off the trailer I had to drive it about 100 yds into my unit and it genuinely didn't hurt my ears but I never revved it over a couple of thousand rpm.

[Petrus]

it genuinely didn't hurt my ears but I never revved it over a couple of thousand rpm.

That is a wold, no two worlds; throttle bore and revs, of difference.
Have a listen at the sound track of Southern Bell. Nice and sexy up to kK and mid throttle. Definitely too passionate for daily living together towards full bore/ 5k....