1g VS 2g manifold spool times...

[forcefed86]

So I know the 2g manifold has larger ports and everyone thinks bigger is better.

But...

Wouldn't it be beneficial to use the smaller 1g manifold? The smaller ports and runners would increase velocity and this would speed up the time required to "spool-up" the turbo?

I've got a 2g manifold thats been ported pretty heavily and a stocker 1g sitting in the garage. There is a pretty noticable difference. Anyone play with this?

 

[Bud92gsx]

Under your logic, the 1g auto manifold would be even better for vellocity...

I noticed an decrease in spool time going from auto manifold to 5spd manifold..Larger ports would equal more air..Meaning less spool time..

But if you have seen the difference between 1g and 2g manifolds, you will know the 2g looks to be thicker and more durable..

But this is also almost the same principal as 1g vs 2g heads..The 2g head created more velocity, and more low end tourque..The 1g head offers more flow and better high end power..

I would really like to see the 1g vs 2g head on the dyno, but I don't know if anyone has the means to do so..Also 1g auto, 1g manual, and 2g manifold, I would also like to see on the dyno..

 

[Boostinsideways]

The 1g manifold cracks a lot easier. The 2g manifold will have better top end, durability, and you only loose a small amount of spool. A good header wrap, and turbo blanket can bring that back up.

 

[92AWDHX40]

The 2g flows very well 1g has a smaller opening and turbine bolt pattern with the 1 automatic, manual bit larger but not really free flowing and prone to cracking.

 

[JusMX141]

I'd think turbine housing a/r and turbine wheel spec would have more to do with effecting spool times than comparing two nearly-identical cast manifolds.

In other words, using either of these manifolds in unported form should offer no seat-of-the-pants change in spool or power, where changing from a 6cm to an 8cm turbine housing would offer a noticeable change in spool / flow.

 

[Bud92gsx]

I'd think turbine housing a/r and turbine wheel spec would have more to do with effecting spool times than comparing two nearly-identical cast manifolds.

In other words, using either of these manifolds in unported form should offer no seat-of-the-pants change in spool or power, where changing from a 6cm to an 8cm turbine housing would offer a noticeable change in spool / flow.

Now which manifold are you speaking of..1g manual and 2g?

I noticed lower spool time on a 13g, with a different manifold..I have never tried it on a 14b..And I have also not tried swapping the manifolds on a 16g and counting spool time..But I think I may just have to try that..Just for fun, and refference..

 

[JusMX141]

The best thing you can do to a 1G auto manifold is scrap it unless you're using a 13G. The runners are the same size as the manual manifold- the only difference is the tiny offset outlet meant to match the 5cm 13G turbine housing. In order to make such a manifold work properly with any other turbo would require hours of porting to the collector....and when you're done you'll have exactly what came on the manual cars.

I believe we're comparing runner sizes only as the collector should always match whatever turbine housing you're running.

 

[Bud92gsx]

You are correct the best thing to do with a 1g auto manifold is throw it away.I agree...But as you know most of us are dsm parts hoarders(me included)..And I like to just have stuff sitting around..Make crap out of me if you want, but I like to have stock parts laying around, even if their crap parts....

On the manifold outlet(to turbo) it is a noticable difference between auto and manual..I'm sure you have seen the difference before..So I don't really need to tell you that, and I really don't know why I did..

 

[H4G64T]

Well Justin has addressed the issue in this post. Just as an add-on, for the price I don't see any reason to not just get an FP and call it a day.

 

[91stocker]

I've got a 2g manifold thats been ported pretty heavily and a stocker 1g sitting in the garage. There is a pretty noticable difference. Anyone play with this?

There is a cfm side by side done on the 1g manual, 2g, and evo 3 mani's somewhere on this site.

The 2g flowed a good deal more then the 1g and just barely less then the evo3. For the price evo 3 didnt seem worth it. So i went with a ported 2g. Havent installed it yet. Very soon though.

 

[Boostinsideways]

Or sell that 1g auto manifold to a saturn owner... You can modify the dsm manifolds to fit saturn heads pretty easy. The port spacing is nearly identicle. You just need to port the runners to match the gasket, and then welding tabs for bolt holes.

Beats the shit out of the 400+$ manifolds out there for s-series.