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Old 05-01-2008, 12:00 PM   #1
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Default Suggested IC pipe size for BEGi-S kit

Hey all, I've got myself in a mental jam here... I've got the BEGi S on my '99 Automatic miata and would like to do in IC install this weekend. I went on the "cheap" for now and got a small IC from FM back when they had a sale on the "shiny IC" for $99.00.

So I suppose the issue I'm having is in picking the correct IC tube size for my build. The BEGi pipes on the kit are mostly 2" OD with a flare going into the TB. The Flyin Miata IC has 2.25" OD inlet / outlet.

My initial thought was just to go with 2.25" tubing all around and just reduce @ the points where I will re-use some of the BEGi-S kit. However, I dunno if this will be a good time to go up to another size and just reduce @ the smallest points as needed. (i.e. Use 3" tubes and then reduce down as needed.)

Anyhow, I know that this has been discussed to the point where it should be automatic knowledge... but I really could not find a good answer based on the BEGi S kit. Sorta application specific in a way.

Since I'm a touch out of my element... your help is totally helpful!

Thanks and cheers,
Prospero
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Old 05-01-2008, 12:03 PM   #2
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I'd use 2" on the hot side and either 2.25 or 2.5 on the cold side, with reducer couplers as appropriate.
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Old 05-01-2008, 12:04 PM   #3
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I'd use 2" on the hot side and either 2.25 or 2.5 on the COLD side with reducer couplers as apporpriate.



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Old 05-01-2008, 12:28 PM   #4
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Quote:
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I'd use 2" on the hot side and either 2.25 or 2.5 on the cold side, with reducer couplers as appropriate.
+1 on this, only I'd stick with 2.5" cold side and eliminate need for 2.25"-2.5" reduction couplers which are a bit more pricey then regular couplers
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Old 05-01-2008, 12:33 PM   #5
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well since the IC outlet is 2.25" he'd need a single 2.25->2.5 transition either way.
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Old 05-01-2008, 12:37 PM   #6
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Hmm, this really is getting good! Dumb question tho... why smaller on the hot side and larger on the cool side?

Not that I'm bitchin tho... but never did one like this before on any of my cars; but they also had stupid-big turbos installed on 'em too. Maybe this has something to do with it? Just taking a shot in the dark tho...

Thanks,
Prospero
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Old 05-01-2008, 12:43 PM   #7
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Quote:
Originally Posted by Prospero View Post
why smaller on the hot side and larger on the cool side?
Usually because it's what we've got to match up to.

The TB inlet is 2.5", and most of the common turbo outlets seem to be in the 2" to 2.25" range.

My setup (with a TD04H-15G turbo) uses a 2.5" I/C, and the sizes go as follows:

2" (compressor) -> several 2" pipes and bends -> 2" to 2.25" coupler -> one 2.25" pipe -> 2.25" to 2.5" coupler -> 2.5" silicone elbow into I/C -> 2.5" silicone elbow out of I/C -> several 2.5" bends and pipes into TB.
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Old 05-01-2008, 12:48 PM   #8
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Quote:
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well since the IC outlet is 2.25" he'd need a single 2.25->2.5 transition either way.
I failed to read that part...I assumed that the IC inlet/outlet was 2.5" like on chinacoolers

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Old 05-01-2008, 01:02 PM   #9
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2" pipes are easy to sneak around a/c and p/s
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Old 05-01-2008, 06:58 PM   #10
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a/c and p/s are for women
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Old 05-01-2008, 07:10 PM   #11
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And Tauruses are for Grandmas. You point is?
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Old 05-01-2008, 08:24 PM   #12
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a/c and p/s are for women
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And Tauruses are for Grandmas. You point is?
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Old 05-01-2008, 08:27 PM   #13
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Its not so hard to figure it out Prospero. Just buy some 2.25 and get it done. Besides your cars automatic.


Automatic Miata=
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Old 05-01-2008, 09:38 PM   #14
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And Tauruses are for Grandmas. You point is?
not taurus' with 3 pedals
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Old 05-01-2008, 10:06 PM   #15
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You have a point. My 67 year old Dad has a Taurus SHO and thinks it's hot ****....so Taurus's with three pedals are for (soon to be) Grandpas.

...Granted it does have the Yamaha V8 in it.
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Old 05-01-2008, 10:38 PM   #16
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You have a point. My 67 year old Dad has a Taurus SHO and thinks it's hot ****....so Taurus's with three pedals are for (soon to be) Grandpas.

...Granted it does have the Yamaha V8 in it.
the gen 3 v8 cars were auto only.
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Old 05-01-2008, 10:45 PM   #17
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Id be swappin that tranny before doing turbo.
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Old 05-01-2008, 11:00 PM   #18
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I have 2.25" pipes, they're fine. 2.25-2.5" straight couplers aren't super common, i need two for my IC right now. 2" would be a tiny bit easier to sneak past A/C & PS like Ben said but it shouldn't make much of a difference.
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Old 05-01-2008, 11:11 PM   #19
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You might have me there bryantaylor, either way, it's still a Taurus.
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Old 05-02-2008, 11:56 AM   #20
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Quote:
Originally Posted by mike_671 View Post
Its not so hard to figure it out Prospero. Just buy some 2.25 and get it done. Besides your cars automatic.


Automatic Miata=
WTF, Automatic's rule! I can keep my right hand on my woman's thigh while taking the twisties... so while you are shiftin, I'm (well you can figure that part out on your own.)

Besides, i already have a MS3 in 6-speed and a nearly 400HP manual Volvo... I'm good with my miata being an automatic.

Cheers,
Prospero
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