Interest in Big Bore Throttle Body for 1.8 Engine Miata?

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Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Brian » Tue Aug 02, 2011 10:58 am

Hi Folks,

Got interest in a big bore throttle body for 1.8 application? Fitment 94-2005?

Don't know price and date yet....but let's assume comparable with nice billet units sold for other cars and say the roughly $269.
Attachments
miata-billet-tb.jpg
miata-billet-tb.jpg (204.03 KiB)
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby mx52nv » Sat Aug 27, 2011 7:28 pm

Hi Brian,
Going with what you said on CR.net and if it's a 70mm ID then I'd take one now. :mrgreen:

Les
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Areddi » Thu Nov 03, 2011 7:24 am

Brian,

I am super-interested in this. When I emailed you about it the time-frame was still up in the air. Any updates yet? I am planning to do an all-motor build and this would be super helpful for that. I'd be curious if you have any of the estimated gains from testing as well just to hold me over. Give me something, I am checking the site daily for updates on this!
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Brian » Fri Nov 04, 2011 12:46 pm

Hopefully for the new year is the best I can say currently.
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Areddi » Wed Nov 09, 2011 9:18 am

Okay great to hear, I'll be looking forward to it.

Do you think that it will be a worthwhile upgrade on a car which is still in the early stages on bolt-ons(intake/exhaust/etc), or is this something that will mainly be relevant to the more serious internal work level engine? Would it allow for a good transition between the two?
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Brian » Wed Nov 09, 2011 9:25 am

I expect only helpful for more heavily modified...
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Areddi » Wed Jan 04, 2012 9:46 am

Any updates on this yet?
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Areddi » Wed Jan 25, 2012 8:17 pm

Bumpin' this again. I know you guys are in the middle of your move so no worries if you're busy.
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Brian » Thu Jan 26, 2012 8:13 am

Sorry, no progress to reports on this.
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Brian » Thu May 31, 2012 8:54 am

Update, new TB is about finished, hope to have it in the website in another month or so...


Comments and details below courtesy of GroupA/Skunk2 Engineer Clinton Yee:

I'd like to thank Bill Schenker for his extensive track and dyno testing of our Pro-Series throttle body on his Miata. Off the top of my head, he's been running it for over 18 months in his SOLO car.

This TB was made specifically for the Miata 1.8L and was designed with various levels of guidance and support from Bill Schenker, Oscar Jackson and Brian Goodwin. It's always a pleasure working with you guys

The Miata TB is part of our Pro-Series TB line up. It uses the same shaft and bearing system that has had zero shaft breakages over the multiple thousands of units that have been installed, which include OEM and built 8k+ RPM redline Hondas/Acuras.

As far as sizing goes, our Honda/Acura TBs range from 68mm up to 74mm and are installed on engines from 1.6L to 2.4L that make 95 to 300+ Hp, normally aspirated.

For Miatas, the 64mm inner diameter (2.5" ID) size was chosen to work especially well with the less restrictive JDM flat top manifold (59mm opening). The TB's 64mm opening has about 18% more cross sectional area than the OEM 59mm manifold opening and about 18% less cross sectional area than a typical 2.75" (70mm) Miata intake pipe. So the TB's 64mm ID provides a nice even flow transition going from intake pipe (70mm), to TB (64mm), then to OEM intake manifold (59mm).

It will also work well with the standard US manifolds (also 59mm opening).

In terms of power, do no think of a larger TB as a power "adder", think of it as a power "un-corker". Meaning that other supporting mods are necessary to realize power gains. A larger TB will not make power itself on a stock Miata. Unless breaking a TB shaft is a concern, our larger TB is not a recommended first mod.

This TB will be available in about 6 weeks from long time miata.net sponsor, http://www.good-win-racing.com.

Clinton Yee
Group A Autosports
R&D Department

Here's a picture of an early prototype:
Attachments
New Miata Throttle Body.jpg
New Miata Throttle Body.jpg (182.28 KiB)
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Areddi » Thu May 31, 2012 12:09 pm

Fantastic, I have been anxiously waiting to hear news on these. The write-up was very helpful to get an understanding of how all of the sizes compare on the different manifolds and airflow.

I currently have a K&N Typhoon on the front end, and a RS Mid-pipe/RS III axle-back on the rear, still the stock header on my 01'. I would love to get your opinion on if these mods will make effective use of the "un-corking."

Also, any ideas on cost(similiar to their other Pro-Series I would assume) and pre-orders?
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Brian » Thu May 31, 2012 12:15 pm

Yes, I expect similar cost to other ProSeries units, just a few hundred.

As for speculation on results with any particular combo of intake and exhaust, I really don't know....
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby Chris Thompson » Fri Jun 01, 2012 7:30 am

That is a beautiful piece of work.
'99 Base Sport with bolt-on hardtop and '08 PRHT GT. I love them both. SCCA, PCA, BMW San Diego region #105
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby BrianM033 » Mon Jun 18, 2012 12:17 pm

This TB looks very promising!
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Re: Interest in Big Bore Throttle Body for 1.8 Engine Miata?

Postby JimT039 » Mon Sep 03, 2012 1:08 pm

big bore throttle body available....???

contact JT at 405-605-9853 or online...thanks...

JT
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