3400 rear manifold with a 3100 downpipe? how?

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Slinky
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3400 rear manifold with a 3100 downpipe? how?

Postby Slinky » Fri Jan 27, 2012 11:27 am

Ok so i put my 3400 rear mani on and it obviously dosent line up with the 3100 downpipe.

Has anyone done this?
how did u get it to work?


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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby 3X00-Modified » Fri Jan 27, 2012 12:04 pm

um, build a new down pipe...

My first revision sucked ass...

The second one was much better.

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This is standard 3400swap guide info too, I do not know why your even asking this question.



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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby Slinky » Fri Jan 27, 2012 12:19 pm

I think im just going to weld a SS Braided flex coupler at the top near the flange, it will let the flange bend into place and absorb exhaust vibrations too..

Any thoughts on that?


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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby 3X00-Modified » Fri Jan 27, 2012 12:20 pm

I tried to explain it and show what a 3400 dp flange has to look like but I guess you just don't understand.

Go back and re-read the 3400swap guide and then maybe you'll see the flange is no where near the same as a 3100 one.



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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby Slinky » Fri Jan 27, 2012 12:25 pm

And what i neglected to mention is that i already welded a piece of pipe on the rear 3400 mani so it would hold the 3100 doughnut and be the same as the 3100 rear mani, the only problem now is the angle..


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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby Slinky » Fri Jan 27, 2012 12:31 pm

so now any thoughts on that?


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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby 3X00-Modified » Fri Jan 27, 2012 12:58 pm

3X00-Modified wrote:um, build a new down pipe...

This is standard 3400swap guide info too, I do not know why your even asking this question.



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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby Slinky » Fri Jan 27, 2012 1:07 pm

ok ill take your advice and install the flex coupler


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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby 3X00-Modified » Fri Jan 27, 2012 1:43 pm

Yeah because that was my advice...



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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby Alpinestar10 » Fri Jan 27, 2012 2:24 pm

Just get the flange cad drawings jon posted on 60degreev6.com have someone cut it and buy a bend and go to town, Yes install a flex coupler while your at it but why put a new flex couiple on a old system just spend the extra 25 for a mandrel bend and yard flange if you cant get one cut and youll be good.



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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby woody90gtz » Fri Jan 27, 2012 4:07 pm

The manifold is so close to the rack with an auto that with a pipe on it you might be sunk. I'd grab another manifold and make a pipe to bolt to it like Jon and I did. That 3100 donut is pretty small anyway, and the 3400 manifold is just about right for 2.5" pipe in original form.

I have a spare manifold, but already sold my custom DP to Shane.


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91 "SS" 3400/5spd - EP, FFP, TCE, SPEC, DSS, S&S, OBD1, 13s? GEARHEAD dezign

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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby MY91GT(Z) » Sun Jan 29, 2012 9:09 am

I still have it sitting on shelf in my garage



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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby woody90gtz » Mon Jan 30, 2012 10:44 am

Glad to see you're making good use of it. haha


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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby wicked-irocz » Wed Feb 08, 2012 8:17 pm

Where do you live slinky? I could just make you one thats right.


94 Beretta Z26 57,4xx miles
3100, auto, crank windows, power locks/trunk, A/C,
To many mods to list
-intercooler :shock:

Among beretta boards
1st Turbo 4t60-e
1st Turbo 3100
1st Turbo Z26
1st 94+ Turbo

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Re: 3400 rear manifold with a 3100 downpipe? how?

Postby MY91GT(Z) » Thu Feb 09, 2012 6:53 am

he is from somewhere in pa




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