1g or 2g exhaust manifold

[91-gsx]

What are the major differences between the 1g and the 2g exhaust manifolds? Ihave read that the 2g flows more air and the evo3 manifold flows even more then the 2g, but how does this translate to the power potential of each manifold? I have a 1g manifold and I am planning to upgrade to a scm6152 turbo, will a 2g manifold make more power then a 1g in this case. I am currently running a pacesetter manifold but I am sure that will not hold the bigger 6152 weight.
thanks for the help

 

[DSMunknown]

I assume you have seen these, right?



http://vfaq.com/mods/porting-exhman.html
http://vfaq.com/mods/exhman.html




The below stuff is from RRE's website:


Unported EVOIII exhaust manifold on the left and OEM 2G unported on the right:

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EVO III Exhaust Manifold:
These have the same runner diameter as the 2G exhaust manifolds but they have the larger collector that matches the larger inlet to a 16G with a 7cm exhaust housing. They do save a lot of time porting however. They are a direct bolt on for a 2G, they require the same slight trimming on one corner when used on a 1G to clear the P/S bracket as a 2G manifold would need.

This is from Extreme PSI's website:


EVOIII exhaust manifold ported on the top and EVOIII exhaust manifold unported on the bottom:

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EDIT:

Here is two more links to compare the 1G and EVOIII exhaust manifolds:

Photo
Link to webpage


A quote from the above link:

That tired old ported 1G exhaust manifold has been around the block a few times. Instead, we'll be using the Evo manifold which is similar to a 2G DSM manifold but has a larger collector that requires no porting.

EDIT x2:

Look what it says in the "Parts Catalog" section of DSMTuners:


http://www.dsmtuners.com/parts/prod...ducts_id=43&osCsid=fsell02vdg7uj153sm175us2g4

Factory Lancer EVO III exhaust manifold. Slightly larger runners than the factory 2g manifold. Flows better than the factory 1g unit and resists cracking.

What are the major differences between the 1g and the 2g exhaust manifolds? Ihave read that the 2g flows more air and the evo3 manifold flows even more then the 2g, but how does this translate to the power potential of each manifold? I have a 1g manifold and I am planning to upgrade to a scm6152 turbo, will a 2g manifold make more power then a 1g in this case. I am currently running a pacesetter manifold but I am sure that will not hold the bigger 6152 weight.
thanks for the help

Regarding seeing an increase in performance, the sooner you get rid of the 1G exhaust manifold and upgrade to a ported 2G or EVOIII, you will have improved performance. It is difficult to say what exactly the potential of upgrading the exhaust manifold means in concrete terms without doing loads of testing and dyno pulls, but all you need to know is that those two options will be upgrades, and not downgrades. It's all about flow and volumetric efficiency.

 

[fourreGsixty3]

Great post Anthony. The 2G exhaust manifolds also use 10mm mani bolts on the outside runners, and 8mm on the inside, unlike the 1G which uses 8mm all around. Also the 1G mani. is prone to cracking...heck mine nearly split in half from the previous owner, if it wasn't for the flange to the turbo it would have split. The 2Gs are thicker so less prone to cracking, they flow better then the 1Gs like Anthony stated. Pretty much any manifold will be an upgrade from a 1G manifold, if you can pick up a cheap 2G, and port it, then get it, if not, and you were thinking of just buying a new one, then get an evo manifold.

Dustin

 

[DSMunknown]

Great post Anthony. The 2G exhaust manifolds also use 10mm mani bolts on the outside runners, and 8mm on the inside, unlike the 1G which uses 8mm all around. Also the 1G mani. is prone to cracking...heck mine nearly split in half from the previous owner, if it wasn't for the flange to the turbo it would have split. The 2Gs are thicker so less prone to cracking, they flow better then the 1Gs like Anthony stated. Pretty much any manifold will be an upgrade from a 1G manifold, if you can pick up a cheap 2G, and port it, then get it, if not, and you were thinking of just buying a new one, then get an evo manifold.

Dustin

Yeah, I was going to quote the small paragraph in the 1G upgrade guide before. I guess I can do that now:



Scroll down to Step 7

The exhaust manifold on 1G DSMs are notorious for cracking and leaking. The solution is to replace it with a ported factory 95-99 exhaust manifold or aftermarket tubular header. If you're planning on going with a full Garrett turbo, you'll need a manifold that is made to bolt up to a Garret turbo.