Custom Manifold Query? 2 Runners Or 4 ?

[jfooty22]

Hay

Ive started to start modifying my brother Ep71 Turbo-S. Im on acc from getting spare tackled playing hockey lol and my brother wants to get spend some money on the car engine wise so ive been giving the task :tup:

The 2E-TELU has be rebuilt with New Standard pistons , FMIC and a freshy rebuilt CT9a :tup: :tup: the cars been running 9-10psi for the 3000kms since the engine and turbo were rebuilt.

So the plan is that im going to design a custom manifold to get fabricated , and make a 2.5" exhaust for it.

Eventually ill get a FCD , FPR and Fuel pump and if my brother wallet is still open a ecu and tune.

So ive seen lots of custom manifolds etc etc , but all for a head with 4 separate Exhaust ports .. which means 4 individual runners same length to a singer collecter ( Best Design ).... Trouble is the exhaust ports are so close together 1/2 and 3/4 that it would be easyier to cover both ports by the single runner, instead of going through the hassle of making 4 little runners. There is 1.5mm seperating them and The ports are 24x32mm and is 55mm across both ports

So the question is should i try and make 4 runners or just put a 2 1/4" 90degree bend across the 2 ports and run it to a central collector ? Has any made or seen any 2E exhaust manifold or any cylinder head with ports similar to a 2E Head ?

Any help would be legendary

Cheers

The ports are 24x32mm and is 55mm across both ports

[Leeky]

Are there no off the shelf manifolds for this engine?

Having fabricated headers myself in the past i know how much of a nightmare it can be.

I've only ever messed around with NA headers which usually follow the general rule of thumb that the best design is 4-2-1 for optimal trade off of low down torque and unrestricted top end.

For a turbo though....i'd recommend you keep it simple.

A single runner is going to spool the turbo a lot faster and be less work but will be a restriction at high rpm.

In all honesty i would recommend trying to buy an off the shelf aftermarket header or stick with the stock one.