TTE Exhaust - Turbo restrictions

[Gaz2405]

Hi All,

Looking for some advice on TTE exhaust on turbo applications.

Does anyone happen to know or have experience in the bhp limitations of the TTE exhaust when used in conjunction with a turbo.

I have a 2.5" down pipe, going straight into a 2.5" malian sports cat then into the standard TTE exhaust.

I've just made 233bhp on my turbo build but was looking for more, hoping I've got some more ponies to be had by an exhaust change.

Currently eyeing up the malian twin centre exit (lotus style).

Cheers

Gary

[Nvy]

Some of the others will reply shortly but I can say that its quite small on the inside so if you are looking for more just go with custom exhaust. Wont be much more than malian stuff.

[s12vea]

Yes it does restrict, my old setup made similar power with tte exhaust and mapper said exhaust was holding it it back. A more free flowing exhaust would help your setup for sure.

The tte exhaust hold there money so the sale would prob cover most of the cost of replacement, team moon or SP are the only off the shelf backbox I would recommend but pretty rare. Prob best to get one made

[1979scotte]

Any reason why you want more?
A roadster with that power is a very swift car.
Cheeky I know as mine has much more grunt but it does become pointless on the road and around track the 2s light weight makes it quick anyways.
Also reliability wise for stock engine and gearbox do you want much more? I wouldn't.

You definitely want the tte gone but no rush why not enjoy as is for the time being and then go exhaust and standalone at the same time.

[Petrus]

The logical reasoning:
In the standard set up, the breathing improves:
- marginally if at all with the pre-cats out
- a bit, definitely noticable but not a lot, with the OEM muffler replace by a straight through
- a lót with a decat pipe; nów the better manifold and quite good OEM intake show their worth
Apply the above to a lot more gas flowing because of charging it.

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.

[Gaz2405]

Any reason why you want more?
A roadster with that power is a very swift car.
Cheeky I know as mine has much more grunt but it does become pointless on the road and around track the 2s light weight makes it quick anyways.
Also reliability wise for stock engine and gearbox do you want much more? I wouldn't.

You definitely want the tte gone but no rush why not enjoy as is for the time being and then go exhaust and standalone at the same time.

I suppose its just one of those things always wanting more!

In all honesty I'll probably only change the exhaust if something comes up at a reasonable price other wise I'll wait until forging and going with a proper ecu.

You're right with this amount of power it's certainly makes for a very interesting drive and you soon run out of road.

[1979scotte]

The logical reasoning:
In the standard set up, the breathing improves:
- marginally if at all with the pre-cats out
- a bit, definitely noticable but not a lot, with the OEM muffler replace by a straight through
- a lót with a decat pipe; nów the better manifold and quite good OEM intake show their worth
Apply the above to a lot more gas flowing because of charging it.

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.

Noboby thinks the tte flows better than stock but it does sound much better.
For the above turbo application it needs to go.
I had one on the V6 for a while and I wouldn't recommend it.

[1979scotte]

Any reason why you want more?
A roadster with that power is a very swift car.
Cheeky I know as mine has much more grunt but it does become pointless on the road and around track the 2s light weight makes it quick anyways.
Also reliability wise for stock engine and gearbox do you want much more? I wouldn't.

You definitely want the tte gone but no rush why not enjoy as is for the time being and then go exhaust and standalone at the same time.

I suppose its just one of those things always wanting more!

In all honesty I'll probably only change the exhaust if something comes up at a reasonable price other wise I'll wait until forging and going with a proper ecu.

You're right with this amount of power it's certainly makes for a very interesting drive and you soon run out of road.

Do you know what she weighs?
My FL with turbo was 1050kg I think. Coilovers Style bar.
On power to weight its bloody fast.
You're around 220 bhp per ton similar too an Elise 111R or a Chimera 4.0

[shnazzle]

The TTE even holds back a 2zz, let alone 8-10psi of boost
All said and done it's a pretty crap exhaust but I do so love the sound hehe

[Petrus]

The TTE even holds back a 2zz, let alone 8-10psi of boost
All said and done it's a pretty crap exhaust but I do so love the sound hehe

I think Toyota dropped the ball by not designed a bit more sporty sound in the standard exhaust but think it more mûhhhh that a TTE exhaust is basically a ricer option.

[Ardent]

Attractive ricer though.

[Petrus]

Ok, do laugh but I have seriously contemplated fitting





and only the total cost stopped me.

[Ardent]

 

[tets]

now bare in mind i've only driven mine on and off the trailer but it wasn't ridiculously loud - it's literally a down pipe, sports cat and out. I'm not sure how it will be at rev's but the turbo doesn't half quieten it down - you're welcome to try it out as mines not going to be on the road anytime soon

[Petrus]

Here´s an article on turbo and sound:

http://designingsound.org/2014/07/30/turbocharging-and-its-effect-on-our-soundscape/

[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?

[shnazzle]

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

[Ardent]

As already stated today elsewhere. Every day is a school day.
What the chuff is a team moon.

I imagine it is not the England XV bending over and dropping their shorts.

Just as a point of order.
I'm calling dibs which shnazzle hasn't, prior to it ever being put up for sale.
(Even if I don't know what it is)

[shnazzle]

As already stated today elsewhere. Every day is a school day.
What the chuff is a team moon.

I imagine it is not the England XV bending over and dropping their shorts.

Just as a point of order.
I'm calling dibs which shnazzle hasn't, prior to it ever being put up for sale.
(Even if I don't know what it is)

You wouldn't want it Jase! It's basically a straight-through pipe. It's not known to be quiet, that's for sure. Think sp exhaust, but louder and more raspy. But it flows.

[Petrus]

You wouldn't want it Jase! It's basically a straight-through pipe. It's not known to be quiet, that's for sure. Think sp exhaust, but louder and more raspy. But it flows.

The nice thing about Team Moon pots is that they (also?) made them using aluminium.

[Gaz2405]

If anyone has a picture of a team moon, bang one up. Thinking a out making my own from the cat back.

[Petrus]

The Team Moon looks exactly like the OEM pot with two outlets.

Two outlets is only for visual purposes. It only adds weight and is difficult to design with good flow.

You can easily see why, if the muffler internals design does not disrupt it, this type flows best and has the least material:





I don´t know what´s in there but the best damping would be the pipe going into an expansion chamber and then ´continue´  with absorbtion damping. Very simple, effective and flowing thumbs up.

Anyway, the Achilles heel with the MR2 is lack of space thus short pipes and tight bends. A secondary issue is the location; the heat; in front engined cars the exhaust heat is taken away under the car.
Bottom line is that you want a replacement system to straighten the flow as much as possible and OUT!! 
The rest is easy to figure out ;-)

[Petrus]

Have a look at:




With all repsect and I totally get the looks but fúnctionally the two issues are obvious; extra tight bends ánd rerouting heat back trough the engine room.

Apart from the legal issues and the looks, flów wise the formula is:
- decat header
- decat midpipe
- ´straight through´ muffler with exit on RHS

For a turbo the same applies minus the header and with the advantage of muffling by the turbo; as straight as possible and OUT!

[s12vea]

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?

Team moon is very free flowing and one of the louder exhausts for the roadster. Brad has one on his sp240 years ago and it was the only sp turbo to make 240bhp which was believed partly down to the exhaust.
It will flow better than tte for sure

[Gaz2405]

I think I'm going to get hold of an exhaust flange and some 2.5" pipe and bend my own.

Or ask Malian to make their centre exit lotus style one with just one back box. (or a removable one)