Quick, whats the diameter of the throttle body? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-29-2008, 11:24 AM   #1
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Default Quick, whats the diameter of the throttle body?

I want to order my IC stuff and I forgot what diameter elbow I need for the throttle body.
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Old 04-29-2008, 11:32 AM   #2
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2.5"
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Old 04-29-2008, 11:39 AM   #3
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Are you sure?

I coulda sworn it was larger, I was planning on using a 2.5 inch pipe I just dont remember if I needed a 2.5 inch to 2.75 or 2.5 to 3.

I know the MAF housing is larger then 2.5.
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Old 04-29-2008, 11:44 AM   #4
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I am pretty sure...I have a 2.5" ID coupler there now
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Old 04-29-2008, 11:54 AM   #5
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its a little smaller than 2.5" IIRC, but a 2.5" couple works best.
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Old 04-29-2008, 12:03 PM   #6
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wasn't it like 53mm or something like that...OD is very close to 2.5"
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Old 04-29-2008, 12:08 PM   #7
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Quote:
Originally Posted by Zabac View Post
wasn't it like 53mm or something like that...OD is very close to 2.5"
I have a 2.5 90 degree coupler and it fits just perfect, this is for an NB though so I am not sure if the OD is different.
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Old 04-29-2008, 12:10 PM   #8
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Sold. Thanks guys.

Just ordered tube and bends from racing solutions for my IC piping. I wish they had thinner stuff, and I wish even more I could buy it locally, but everywhere I go is rape price wise.
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Old 04-29-2008, 12:16 PM   #9
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Move south of the Mason-Dixon line
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Old 04-29-2008, 12:41 PM   #10
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Quote:
Originally Posted by Zabac View Post
Move south of the Mason-Dixon line
If only everything was so simple.
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Old 04-29-2008, 05:48 PM   #11
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Sorry to threadjack Sam but I'm also facing some issues with the coupler installed on my car (it gets loose pretty easily and I face a leak). I was told at the shop that I needed to get an intake pipe reducer from 2.5" to 2.25".

Is everyone positively sure that the NA throttle body is 2.5"?

Thanks and, once again, sorry to threadjack Sam!
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Old 04-29-2008, 05:54 PM   #12
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omg, your shop sucks dude.
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Old 04-29-2008, 05:57 PM   #13
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Quote:
Originally Posted by Rafa View Post
Is everyone positively sure that the NA throttle body is 2.5"?
On the 1.6, it is not exactly 2.5", however a 2.5" silicone coupler is a nearly perfect fit.

Can't say about the 1.8 cars...
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Old 04-29-2008, 05:58 PM   #14
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Quote:
Originally Posted by Braineack View Post
omg, your shop sucks dude.

No **** and the worst thing is that I've got no option

Braineack could it be that my IC piping is 2.75"? I bought a used S5 Begi so if anyone has one I'd appreciate some confirmation.
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Old 04-29-2008, 06:03 PM   #15
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Ill go measure mine today and post a pic.
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Old 04-29-2008, 06:37 PM   #16
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Quote:
Originally Posted by Saml01 View Post
Ill go measure mine today and post a pic.
I'm scared of both the measurement and the pic!

I don't think you have an S5 installed.

Thanks anyways Sam.
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Old 04-29-2008, 06:56 PM   #17
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1.8L is also 2.5" OD IIRC. I have 2.25" pipes on the cold side and had to use a 2.25-2.5" transition for the TB.
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Old 04-29-2008, 07:16 PM   #18
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I have the 1.8 NA, and I have a 2.5" coupler there...only thing that sucks is that the other end of the intake piping is not connected to a turbo or intercooler
N/A blows
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Old 04-29-2008, 08:43 PM   #19
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Quote:
Originally Posted by Arkmage View Post
1.8L is also 2.5" OD IIRC. I have 2.25" pipes on the cold side and had to use a 2.25-2.5" transition for the TB.
Thanks Arkmage and Dan. I assume I'll have to get a reduction coupling in my case.
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Old 04-29-2008, 09:41 PM   #20
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Quote:
Originally Posted by Zabac View Post
N/A blows
In every sense but literal.
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