[RESOLVED] Stock manifold with twin scroll holset housing? Bad idea?

[talonsteve25]

The reason i ask this is beacuse i could go and make a twim scroll manifold but i dont like the idea of two wastegates and the extra exhaust tube id have to mend in some where. But i did have an idea of mounting to the stock manifold and sticking a waste gate in between which im sure would work as of fabrication, but how much spool time would i lose? Is it really worth all the time and money to use the twin scroll the turbo comes with to advantage? And i have searched but the threds went off my topic.

 

[gstryyder]

it is worth more to you to make it a twin scroll then you could even imagine. i would say you lose. AT LEAST 500rpms in spool if you don't go twin scroll. probably more like 1000RPMS... If you can make the manifold yourself...DO IT!!!

 

[JusMX141]

But i did have an idea of mounting to the stock manifold and sticking a waste gate in between which im sure would work as of fabrication

The stock manifold would never permit a twin-scroll Holset housing to be bolted to it and still clear the block.


This is what you'll run into:

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[talonsteve25]

yes it would if there was a angled spacer in between, i ould also run a waste gate in the middle of the manifold and turbo.

 

[JusMX141]

That still doesn't explain how you're going to make a smooth transition for exhaust flow coming from: (O)
...and feeding into: (00).

Either fab your own twin-scroll manifold or buy a bolt-on BEP housing. Don't half-ass this job or you'll be mad at yourself.

 

[JEFFREYCASTGSX]

The reason i ask this is beacuse i could go and make a twim scroll manifold but i dont like the idea of two wastegates and the extra exhaust tube id have to mend in some where. But i did have an idea of mounting to the stock manifold and sticking a waste gate in between which im sure would work as of fabrication, but how much spool time would i lose? Is it really worth all the time and money to use the twin scroll the turbo comes with to advantage? And i have searched but the threds went off my topic.

You dont need "two" wastegates, just(like already stated) get a twin scroll manifold or a BEP housing.

 

[JusMX141]

For proper boost control on a true twin-scroll turbo, two wastegates are recommended as boost will need to be pulled from both runners. This opens a whole new door to wastegate calibration and such to be sure both gates are opening at the same time.

If you're building the manifold yourself you can plumb a single gate but split it into both runners.

 

[talonsteve25]

Thats a good idea actually! i definitly can do that i already made the collector today. Thanks for the idea