Good afternoon all,

I've been putting together a turbo setup for the 1UZ hotrod I'm building and managed to score 2 Mitsubishi Evo 8 RS TD05's (the titanium alumnide exhaust turbine versions! ).

I've been looking into how I should route the exhaust manifolds, given I don't want to have any pipes crossover from bank-to-bank, to get optimum exhaust flow.

1UZFE cylinder numbering - viewed from the top:
8 | | 7
6 | | 5
4 | | 3
2 | | 1
front of engine

Firing order
1-8-4-3-6-5-7-2

As I'm not interested in having exhaust pipes running from one bank to the other side, which is required to get the optimal separation of exhaust pulses, the arrangement I've come up with is as follows.

Isolating just the left bank firing order
1-x-x-3-x-5-7-x <- pair 1&5, 3&7

And the right bank firing order
x-8-4-x-6-x-x-2 <- pair 2&4, 6&8

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*credit MSPaint.exe CAD software*

It will look at little funky with the different manifold arrangements on each side, but as far as I can tell this will be as close to optimal as I can get without having pipes running all over the place between the banks.

Just sort of opening this up for discussion to see if there is a better way to set it all up.

Also, would it be worth making the runners for cylinders 1, 7, 4, and 6 longer in order to try and make the pulses more evenly spaced, by delaying the 2nd pulse in the pair?

 

guys making huge power with log style manifolds are laughing right now. I get what you're thinking hwere, but if this isn't a max effort world record breaking deal, i'd just make a 4 into 1 and run it.

 

Haha, I absolutely appreciate that! I'm mainly looking into it because I have to make the manifolds anyway and it's not really any more effort to do it properly, so I might as well.

I'm really after the faster spool that twin scroll can provide, being a street car, and not going to do a log manifold as it's an open engine bay so I want it to look somewhat presentable

The Evo twin scroll flange doesn't look like it would work well with a 4-1 either
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The way you have it in your drawing is fine. Don't worry about tube length, it doesn't matter that much, it really is just a pulse count thing.

Stop thinking, start building. Your going to plan yourself into a box you won't be able to get out of and become frustrated. The sooner you start seeing things come to life the sooner you can find the actual problems and start solving them.

 

Analysis Paralysis. I get it frequently myself.

 

Cheers guys, I appreciate the feedback. Good to know I can pretty much ignore the different length tubing - I'd hoped that would be the case.

No chance of design paralysis here, the project is in full swing, I just can't do any work on it during the week so I may as well use some of the time to further the design process. When it comes time to make the exhaust manifolds I'll get straight into it.

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