FMII with BEGI-S4 manifold??? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-03-2012, 01:37 AM   #1
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Default FMII with BEGI-S4 manifold???

Has anyone tried using the BEGI S4 turbo manifold on a FMII turbo kit? I know they both have a t25 flange but i don't know if fitment is an issue. I've looked for previous threads but couldn't really find the answer I'm looking for. If I over looked a thread with a decent answer would somebody post a link? I'm putting a '99 in my '92. From pictures I've seen it looks like the turbo placement is slightly lower in the engine bay on the BEGI mani. Thank for any answers!!
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Old 02-03-2012, 01:39 AM   #2
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Forgot to add I wanna run a gt3071 turbo....
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Old 02-03-2012, 01:41 AM   #3
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Downpipe won't mate up. Piping will be in a different location for the turbo outlet and inlet.
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Old 02-03-2012, 01:57 AM   #4
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I was assuming that if I used the BEGI manifold I would have to use there downpipe also... Seems to me that the only difference would be IC piping but it's my first turbo build so I'm fishing for advice first.

Thanks for the response!!
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Old 02-03-2012, 03:38 AM   #5
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Quote:
Originally Posted by Downshift88 View Post
Has anyone tried using the BEGI S4 turbo manifold on a FMII turbo kit? I know they both have a t25 flange but i don't know if fitment is an issue.
There would be a severe fitment issue. The S4 manifold is a "bottom mount" manifold and the FM turbo kits use a "side mount", so the big issue would be the downpipes. Simple answer is there is no way they would work together. Turbo placement and orientation is too different.

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Originally Posted by Downshift88 View Post
I'm putting a '99 in my '92. From pictures I've seen it looks like the turbo placement is slightly lower in the engine bay on the BEGI mani.
Yes, you're right. The S4 mounts much, much lower in the engine bay since it's a "bottom mount" design.

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Originally Posted by Downshift88 View Post
I was assuming that if I used the BEGI manifold I would have to use there downpipe also
Well, there are some issues here. Begi and FM kits used to be one in the same, now they are completely independent of one another./

I can't answer yes or no because the older kits would interchange. But for the new kits, I'm pretty sure the FM manifold places the turbo higher than the Begi manifold. Downpipe fitment could still be an issue. Again, this is just for the newer kits. Some of the old kits could interchanged parts.

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Originally Posted by Downshift88 View Post
Seems to me that the only difference would be IC piping but it's my first turbo build so I'm fishing for advice first.
If I had to use off the shelf intercooler piping, it would be the FM silicone kit. I received their coldside piece in a trade a few years back with another member and I love it. Otherwise, I'd just make my own with an ebay kit.

My hotside is just two pieces of aluminum and a few couplers. I did it for under 35 bucks. Intercooler piping is so easy to make I wouldn't let that be a deciding factor when buying a miata turbo kit or pieces of one, etc..


If I was in your position, instead of looking to interchange hardware fromm new kits, I'd call Begi and talk to them about a turbo kit. They can build you a downpipe specific to your engine swap and ship it with the rest of a kit that you can design to your liking. The Begi S3 is very popular, so is the S4. Since you're interested in the S4 I'd just go that route.
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Old 02-03-2012, 06:44 AM   #6
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What I'm looking for is a quality 300+hp for daily use and closer to 400 hp when I wanna crank the boost up and play around... I really like the FMII kit... FM seems like they explain there kit in more detail and it seems like it would almost be an easier instAll and tune. I was on the BEGI web site earlier and the S4 with all the options of an FMII end up costing about the same.. Which standalone would you suggest for the BEGI and which one would be comprable to the nemesis?
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Old 02-03-2012, 10:30 AM   #7
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