Thank you BEGi (Installed Intake Manifold Pics)
#1
Boost Czar
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Thanks a ton to Steph for helping me with my boost addiction. Big props to Tim for welding this up for me over there. Also like to give a shout out to Splitime, Cjernigan and Y8s for their help as well in the process.
I have some days I need to burn up, so hopefully I'll have this on soon, gotta fire up the kerosene heater!
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I have some days I need to burn up, so hopefully I'll have this on soon, gotta fire up the kerosene heater!
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#3
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Cant wait to see the results.
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#5
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Still working on it I think. This one is Scott's creation.
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#10
Boost Czar
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like everyone said, I came up with this design and BEGi was kinda enough to do they hard work for me. I have a 1.6L so the fuel bungs are intergrated into the IM, so I cut off the stock runners and had them weld it up to the stock piece.
#11
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We are we gonna get the plans for this so we can get them made ourselves? I know of a guy locally who can weld his *** off.
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#12
Boost Czar
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uncertain if BEGi wants to replicate these for the 1.6L or not....let's see what Steph has to say. I already know a few people that want a duplicate, or at least a IM for a 1.6L in general.
#16
Boost Czar
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The stock plenum is 3" OD...it's probably 2.5" ID, it's not very large. I'll try to take a shot of the inside, but the opposite wall from #3 and #4 gets very tight. The reason I really wanted to do an IM manifold is because it's very apparent that there's a major restriction when trying to breach 200rwtq after 5K. If I run 12psi my torque is flat from 4K to 6.5K, if I run 14psi only flat from 4K to 5.5K, where it drops off. You see it on almost every dyno, and don't see it on ones with better flowing IMs.
I chose to go 4" OD, should be 3.87 ID. When I do that math that's close to 1.5X the displacement of the motor, and what the "rule of thumb" is for sizing a turbo manifold. That and shorter runners; I only have about 5" worth of runner now.
There's a few things I would probably change, like maybe not bother with the 45* bends and use a shallow domed end cap instead of the hemisphere, but I'm still expecting a 10-15% power increase above 5K![](https://www.miataturbo.net/images/smilies/cool.gif)
The manifold Stitches linked is BEGi's concept for their new manifolds...see the BEGi manifold thread or their website. Your new NB can have one soon
I chose to go 4" OD, should be 3.87 ID. When I do that math that's close to 1.5X the displacement of the motor, and what the "rule of thumb" is for sizing a turbo manifold. That and shorter runners; I only have about 5" worth of runner now.
There's a few things I would probably change, like maybe not bother with the 45* bends and use a shallow domed end cap instead of the hemisphere, but I'm still expecting a 10-15% power increase above 5K
![](https://www.miataturbo.net/images/smilies/cool.gif)
The manifold Stitches linked is BEGi's concept for their new manifolds...see the BEGi manifold thread or their website. Your new NB can have one soon
![wink](https://www.miataturbo.net/images/smilies/wink.gif)