Hey All,

Whos the go to for the best brand of exhaust manifold these days? normal orientation none of that front facing crap etc. V band for aftermarket turbos!

Need to replace mine and doing a bit of a hunt around to see what the best on the market is these days.

 

Artec's cast stuff sits #1 in my book. They've got a vband option for all the popular turbo options.

https://artecperformance.com/product...verse-rotation

For anyone in the states that's interested we can get you set up with one, just shoot me a message.

 

So is this manifold truly better than say a ported FP manifold on a stock turbo? I'm just I/E/MBC/93 octane only for STU/SCCA. Really wondering if it's worth the justification in my case. I've heard good things about this manifold as well - just never seen any sort of back to back testing.

 

The turbo is the restricting component in the system when it's a stock turbo so I doubt you'd see much of any change in performance moving to this one. But this one is made from 347 stainless so won't get rusty like the FP cast mani.

 

I don't use vband so this isn't from personal experience, but isn't all of the Morrisson Fab stuff supposed to be excellent?
http://morrisonfabrications.com/prod...runner-v-band/

 

These only work on reverse rotation turbo's though

 

Well you didn't specify that haha. Reverse rotation makes more sense on these cars as it keeps the whole engine footprint smaller.

There's plenty of welded options out there too with varying quality. My preference would probably be something like the JMF which uses a cast collector.

 

A recent pic of Ben's own 9 wagon eng bay. The car has been doing a lot of wot runs with a box I built.
Interesting to see the heat color change in the cast S/S exh mani. To me it shows the heat at the head is fine!

 

Morrison did mine, work of art. Added EGT sensors to each runner to program fuel cut on the Motec and jet-coated it black. Very customer focused, lifetime, etcetc. That new lead time is terrible though....23 weeeks...gd damn.

http://morrisonfabrications.com/

 

jesus 6 months wait lol

 

For a vband manifold, all of the Garrett G series turbos are available in reverse rotation.

 

There is a australian company that makes bolt on G25s for the Evo. I would pair that with an Artec exhaust manifold. I saw data on the Artec exhaust manifold on a different thread on the forum. I keep forgetting the title.

Anyways this company looks like they made a custom twinscroll hotside for the G25-550. I think there is also a 660 kit available too. I dont remember exactly because I looked at it a couple months ago.
https://gcg.com.au/turbo-charger-g25...on-Performance

 

The simplicity and presumed reliability of the Artec manifold is appealing. If that had been available a couple years ago, I probably would have gone that way over a fabricated manifold for my G25-660. I wonder how the performance compares to a fabricated equal length manifold though?

 

For response, runner length matters more than keeping lengths equal. Most of what spools a turbo is thermal energy, not kinetic energy. Shorter runners means less heat is lost to the manifold and ambient, and more goes into the turbo. It's not too surprising that it's almost impossible to match the stock frame stuff response without moving to a fancy turbo like an EFR.

For peak power, having equal length runners is usually the preferred route. Longer runners of equal length help keep back pressure lower and allow for the turbo to be pushed a tad further to make a bit more power. Useful for drag racing where you're not falling out of boost, do it on a road course and the turbo is going to live a shorter life regardless of the manifold you're using.

 

Artec stainless cast manifolds with G series reverse turbo