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

 

[DSMeclipse4G63]

Yes you can use a 1g intake mani on a 2g, but you cant just slap it on there and call it a day. You need to extensivley port the head out for the runners to match. Otherwise youll have some seriouse problems, but if you do port the head and put it on youll notice a BIG difference. But my advice would be if your willing to go that far might as well scrap those plans and just swap the whole 1g head to your 7-bolt. The reason why is they already are matched to the mani they flow ALOT more then 2g heads, and the cams on the 1g turbos have (I cant remeber which one exactly)more lift or duration.
Andrew

 

[LifIsPeachy02]

i don't mean to jack the thread but my friend has some cams from a 90 laser could i put them on my 2g and feel a diffrence??

 

[DSMeclipse4G63]

I dont know about 90 dsm's being as though they are different for emissions. I know for a fact that other turbo cams are ok and will give you a slight difference.
Andrew

 

[chovis38]

I am wondering... does the 1G intake manifold bolt up to the 2G head? I am also under the impression that the 1G intake manifold flows better than the 2G... is that correct? Any feedback would be great.

 

[SnowWhite]

Yes, the 1G intake manifold does flow a helluva lot better than the 2G, but I am not for sure if it would bolt up to the 2G head. I would assume so, but when I put my 1G Intake on I also stuck the 1G head on there.

 

[4geze63]

yes 1g is better

 

[dave99gst]

ya it bolts up -

ya will need to figure out a mdp hookup

 

[chovis38]

so then my best bet would be to put on a 1G head along with the 1G intake manifold and throttle body....? ok, now I am pretty sure that the 2G exhaust manifold bolts up to the 1G head...... right?

 

[19Eclipse90]

Yes

 

[midnght]

Yes the 1G intake manifold bolts up to the 2G head. The problems behind this is that the runners are a different size (larger) than intlets on the 2G head. Some porting would need to be done to get optimized flow.

The 2G exhaust manifold bolts up, but there needs to be some trimming done to make it fit completely right as is should on the 1G head.

 

[Onnipotente]

how much of a performance gain are you really looking at if upgrading a 2g with a 1g throttle body and intake manifold... or are you just getting better throttle response?

 

[Tallen]

You'll gain alot of turbulence and little else.

 

[ryu]

You'll gain alot of turbulence and little else.

um... isnt that a bad thing? i thought they flow better?

 

[saw wave analog]

i assume he meant if you dont port match the 2g heads intake holes to the 1g manifolds output holes. turbulence is definately bad, i put a ported o2 housing onto a stock dp and the difference in the 3" o2 outlet and the stock dp inlet sizes created a little lip that totally killed my top end.

 

[Tallen]

i assume he meant if you dont port match the 2g heads intake holes to the 1g manifolds output holes. turbulence is definately bad, i put a ported o2 housing onto a stock dp and the difference in the 3" o2 outlet and the stock dp inlet sizes created a little lip that totally killed my top end.

Port matching, or belling out the runners, won't do Jack actually. The head is where the real restriction is at. If you don't believe me...
"Some guys want to just install a 1G manifold on a 2G head. The port size between the two is quite different, you cant just bolt it on. The 2G head _can_ be ported to flow as much or more than an unported 1G head. But if you can get a decent deal on a 1G head why bother ? I have seen some butchered up 2G heads with the 1G Look that were a waste of time to bolt on. Just because you make it huge at the gasket mounting flange does not mean it will flow any better. The real HP gains are made deeper in the runner and the bowl area where it is harder to get to."
-Roadrace

http://roadraceengineering.com/1g2gheadswaptechtip.htm

 

[Syndicate13]

At least there's some good info in this thread. Yet no one mentioned that at this stage of tune for his car he'd likely see better gains and less hassle with something else. The stock 2G head, IM, and TB have gone low 11's. You are nowhere near that at the moment and while switching to a 1G head, IM, and TB may give you some noticable gains now, they won't be as pronounced as say a full exhaust or a mild turbo upgrade.

 

[saw wave analog]

i dont buy that port matching the runners wont do anything.. its common sense that gasses will flow better across a smooth transition as opposed to going from a larger diameter path that abruptly transitions to a smaller one of a different shape. the 1g head is no doubt the better of the two, but i believe you would see some top end gain with a 1g manifold on a 2g head. maybe not worth it for the work involved, but still possible.

 

[gsxtreme1987]

sup people...


i was plannin on getting a 1g intake manifold for my 2G gsx.. but i wanted to know would it bolt right on or would ihave to cut/move things.. and

how much hp does it increase if any?
are the used ones of off ebay any good?

thanx

 

[Mackzero]

Yes, you can bolt it up it has been covered MANY MANY times on here, just search and you will get all the info. you need.

 

[Coup D E'Tat]

Unless you're going to port match the head, don't bother doing it.

 

[Staytuned]

Also the coil pack and ignition transistor will not bolt back up to the 1g manifold without modifying the brackets or mounting them somewhere else in the engine bay.

And yes you will have to match the ports on your head to match the runners on the 1G manifold.

 

[Catbox_95]

Unless you're going to port match the head, don't bother doing it.

This is very true.

 

[sjwelna]

The 2g head is very underrated. One of my friends just made 501 fwhp on a stock 2g head + cams and a gt35r. (built bottom end of course, it was made on 29 psi and race gas).

Moral of the story: you can still make amazing amounts of power with the 2g head (I wouldn't worry about changing over to 1g stuff unless your making TONS of power).

-Steve

 

[L2RTSiAWD]

The 2g head is very underrated. One of my friends just made 501 fwhp on a stock 2g head + cams and a gt35r. (built bottom end of course, it was made on 29 psi and race gas).

Moral of the story: you can still make amazing amounts of power with the 2g head (I wouldn't worry about changing over to 1g stuff unless your making TONS of power).

-Steve

Agreed, I'd say the hassle is not worth the difference in power (if you can even feel any)

 

[J-Syght]

okay i know i will have to port out my head in order for the 1G intake manifold to work right, my question is could i use the same bolts off of my 2G intake manifold onto the 1G manifold? And can i use all my sensors & motor off of my 2G TB, on my 1G TB? Sorry if these question have been ask before, but i search a little and didn't find much.