Which Intake Manifold 1g or 2g? [Merged 8-9]

[96TalonAWD]

Yep thats my doubt which one is better? And what is the diameter of the 2g manifold in inches??


Thanks i dunno

 

[project_tsi]

because the ports in the 2g head are much smaller in diameter than a 1g intake mani and there head. Unless you port match the head to the intake manifold, then all thats going to happen is air is just going to get trapped in your head and swirl around, and thus hurting performance

 

[prophecy7115]

because the ports in the 2g head are much smaller in diameter than a 1g intake mani and there head. Unless you port match the head to the intake manifold, then all thats going to happen is air is just going to get trapped in your head and swirl around, and thus hurting performance

so everybody who has a 2g and swaps the intake mani from a 1g has to port match??? the head to the mani? i never heard of this.. ..hey thanks for the info now i know not to go threw that hassle... i am a high school student on a budget..

 

[project_tsi]

no, you dont HAVE to port match. But if you dont do it, you will loose performance, and gain didly squat

 

[prophecy7115]

no, you dont HAVE to port match. But if you dont do it, you will loose performance, and gain didly squat

so will i loose performance?? better off staying with the 2g...huh

 

[project_tsi]

yeah, unless you port match your 2g head w/ a 1g intake manifold. If you dont then stay w/ the 2g head/ 2g intake mani combo. If your not willing to go all out on the setup then dont go at all

 

[Staytuned]

Here is a pic that I have posted on every thread about this. This is a 1G gasket an my 2g head. I was going to do this mod this past winter but as you can see there is a lot of material to be removed ....not worth the risk of wrecking a perfectly good head.


Pic here

 

[Syndicate13]

If you want a better intake manifold for a 2G head but don't want aftermarket look for an Evo3 manifold. It already has a 60mm opening to the plenum for a 1G TB but matches the 2G head ports. The runners are 3 inches shorter than any DSM manifold for better topend power as well. It has absolutely no provisions for emissions equipment though, so keep that in mind where they smog.

 

[CrazyUglyCoyote]

Are you joking? Have you ever seen a 2g head and 1g head side by side? The port difference is crazy. If you put a 1g intake manifold on a 2g head, then sure it's "bigger", but all the air will basically be hitting a brick wall when it goes up to where the manifold meets the head.


You would have to portmatch the head to the manifold and given the amount of material available on a 2g head it's damn near impossible to make this worthwhile. Not to mention going too deep with the port job you will most likely hit a coolant pocket. If you want a 1g manifold that bad then do a whole 1g head swap. Another minor detail to think about is that the 1g intake manifolds don't have the mount for the map sensor. Not really worth the hassle imo.

Sorry I figured doing the port match was a given. My apologies.

 

[DSMTalonAWD51]

10's have been run on a stock 2g intake manifold. A 1g manifold an ported head would help when you're getting into serious speed, but youre going to sacrifice your low/midrange drivability even more.

 

[justin0469]

how do i get the 2g mani differential pressure sensor to hook up to the 1g manifold?

 

[jrpmp69]

I just bought a 1g intake manifold off ebay and i want to install it on my 98 eclipse gst, what steps do i need to take to install this on my car? i noticed that the 1g intake mani doesnt have that sensor on top like the 2g does or a location for the coil.
I'm sure there are many 2g owners that have done this mod, if you can please help me i would greatly appreciate it.

 

[GSX20]

Here's the link to a write up.

http://www.dsmtuners.com/forums/showthread.php?t=69924


It was in the tech guide section, which can be found at the top left of every page.

 

[jrpmp69]

Here's the link to a write up.

http://www.dsmtuners.com/forums/showthread.php?t=69924


It was in the tech guide section, which can be found at the top left of every page.

That is for a 1g TB install not an intake manifold replacement.

 

[oldman]

The 1G IM ports are a lot bigger than the intake ports on a 2G head, installing a 1G IM without proper porting of the head will create turbulence and lost velocity. I would suggest not doing this until you're ready.

 

[GSX20]

That is for a 1g TB install not an intake manifold replacement.

Oops, my mistake!
Oh well, at least he now knows where to find the tech guide.

 

[CyberEye]

The 1G IM ports are a lot bigger than the intake ports on a 2G head, installing a 1G IM without proper porting of the head will create turbulence and lost velocity. I would suggest not doing this until you're ready.

Correct, you'll basically have to pull the head and have them ported to match.

 

[gsxeclipse97]

What! can you do that? the ports are twice the size of the 2g that is a serious port job. If i would have known that you could do that i would have done that when i was going to put the cyclone on my car and yes i have everything to make it work correctly

 

[jrpmp69]

The 1G IM ports are a lot bigger than the intake ports on a 2G head, installing a 1G IM without proper porting of the head will create turbulence and lost velocity. I would suggest not doing this until you're ready.

Yes, i know that, i am getting the head ported also, but besides that, what else do i have to do?

 

[oldman]

Yes, i know that, i am getting the head ported also, but besides that, what else do i have to do?

Whether you should port match the 2G head to the 1G IM is another argument in itself. Unlike porting your exhaust components, the key to head porting is where you port, not how much you port. Many have argue that port matching the 2g head will most likely create dead spots and decrease over all flow. The ideal situation is to use the 1G IM with a 1G head.

 

[ddavisaf]

No, the ideal match would be a 1g IM on a 1g head on a 1g 6 bolt.

 

[jrpmp69]

Whether you should port match the 2G head to the 1G IM is another argument in itself. Unlike porting your exhaust components, the key to head porting is where you port, not how much you port. Many have argue that port matching the 2g head will most likely create dead spots and decrease over all flow. The ideal situation is to use the 1G IM with a 1G head.

The 2g head has better cooling and oil ports, plus its going to cost me twice as much to buy a 1g head, do a valve job, and port it than if i just port the 2g head. I also have to buy a 1g CAS and cut wires and do a lot of other things to make it fit on my 2g 7 bolt block.

 

[oldman]

The 2g head has better cooling and oil ports, plus its going to cost me twice as much to buy a 1g head, do a valve job, and port it than if i just port the 2g head. I also have to buy a 1g CAS and cut wires and do a lot of other things to make it fit on my 2g 7 bolt block.

I'm not saying you should install a 1G head, I'm saying not to install the 1G manifold because port matching a 2g head to a 1G manfold will most likely hurt, not help, over all flow. I know it's hard to pull back once a project is in motion but in this case I think you should.

 

[jrpmp69]

Well then i guess there goes the money i spent on the 1g IM. I think i'm just going to buy a 1g TB and install it on my 2g, will that make a significant increase?

 

[oldman]

Well then i guess there goes the money i spent on the 1g IM. I think i'm just going to buy a 1g TB and install it on my 2g, will that make a significant increase?

1G TB = 60mm 2G TB = 52mm so yes, it will make a difference. How much depends on other modifications done to the car. If you decide to do this make sure you port the inlet of the 2G manifold to match the 60mm 1g TB.

 

[jrpmp69]

Does anyone know what head gasket (1g or 2g) i would have to use if i installed the 1g head on my 2g?