2G 13b on 2g, which manifold?

[Kyogie12]

Alright, i've tried searching but to no avail. I have a 2g i'm working on and I just need to get it running for a while to clean it up and such. I have a clean 13b with no play I want to put on there. Now I was wondering should I use the 1g 13b Exhaust manifold and drill out the corner holes for the studs (2g being 14mm instead of 12mm on the 1g). Or Should I just use my 2g Mani on the 13b even though the input hole on the 13b is much smaller than the output hole on the 2g exhaust mani?

If I ran the 2g mani would that hole difference sent exhaust back into my engine and damage it?

 

[Bud92gsx]

I had a 1g manual manifold on my auto..But then I swapped it for upgrades.

Just use the auto manifold and call it a day..Youll probably go 14b this summer yet anyway.

 

[GalantTuner10]

Do you mean a 13G turbo off of a 1g auto car? 2g manifold will bolt right up to it. IIRC the sizes off the coolant banjo bolts and the oil feed are different as they are smaller.

 

[Bud92gsx]

Hes talking about the difference in the outlet of manifold and the inlet on the 13g tubine housing..There is a large difference..

 

[Kyogie12]

Hes talking about the difference in the outlet of manifold and the inlet on the 13g tubine housing..There is a large difference..

Exactly what i'm asking about. The 13b is off the 1g Auto and I have that stock 1g auto manifold, along with a stock 2g t25 manifold. I'm just wondering should I drill into the 1g manifold so it'll fit over those 14mm studs, or just plop the 2g manifold on it and call it a day? I plan to put on a 16g down the road. But for now this is what I have to work with. Also have all the oil/coolant lines for both a t25 and a 13b.

 

[GalantTuner10]

there is a huge difference but it means nothing, exhaust takes the path of least resistance and will not go back into the engine

 

[Kyogie12]

This is going on a 95 GS-T by the way. Not the 98 GSX that's in my profile.

 

[Bud92gsx]

Lets get it straight..Its called a 13g..

If you can get the 1g manifold to work, Then do that..

Port that 2g manifold for when you upgrade to a 14b/16g..

 

[GalantTuner10]

This is going on a 95 GS-T by the way. Not the 98 GSX that's in my profile.

doesnt matter what car its going on. just had to put a 13g on a built 1g to keep it going and used an FP race manifold. you are fine. exhaust cant reverse unless timing is off.

 

[Kyogie12]

Awesome. Thanks guys!

 

[bastarddsm]

Congradulations BUD! That's the first post I've seen of yours that was good and informative!!!

God job man!

Anyway, The hot side on a 13g is so restrictive that it won't matter what manifold you use.

If it were me I'd run he 13g manifold with it.. Because, manifolds have a certain "life span" why waste it on a 13g?

 

[Bud92gsx]

I call shananagins..

 

[auker1]

Hey I know im late to joining this thread but I just got a 13g thinking it was a real 14b that im putting on my 2g gst. I just ported the 13g hot side to match the gasket of the 2g manifold. I also plan on upgrading to a 16g in the future. If I were u I would just port it and put it on.

 

[gieri002]

I wouldn't bother, the 13g is not an upgrade from the t25.

 

[JusMX141]

Hey I know im late to joining this thread but I just got a 13g thinking it was a real 14b that im putting on my 2g gst. I just ported the 13g hot side to match the gasket of the 2g manifold. I also plan on upgrading to a 16g in the future. If I were u I would just port it and put it on.

Porting is a waste of time as the majority of the exhaust flow entering the housing is being wastegated anyway because the turbo spools so quickly.

A smooth transition is better, keeping velocity up....so using the proper manifold from a 1G auto would be your best bet unless you're doing some creative porting which directs the exhaust flow toward the wastegate hole.

Compare the 13G's turbine housing to a funnel with a small opening at the bottom....doesn't matter how large the top of the funnel is, only a certain amount can exit the funnel at the bottom.