Our New 2012 PRHT SS Project....

Miata Parts, Intakes, Superchargers, Headers, Exhausts, Shocks, Springs, Sway Bars, Brake Kits, Autocross and track mods.
dmicah
Posts: 35
Joined: Wed Aug 15, 2012 12:02 pm
Location: Seattle

Re: Our New 2012 PRHT SS Project....

Post by dmicah »

Hey Brian, any thoughts about impact on horsepower relative to stock or your original midpipe?
Verwah
Posts: 22
Joined: Thu Aug 29, 2013 8:18 am

Re: Our New 2012 PRHT SS Project....

Post by Verwah »

Do you have a number for the weight penalty of this mid-pipe versus the other version? If I used the new mid on a GWR header/RSII(or SQ) system would it still weigh less than stock?
Chuck H
Posts: 154
Joined: Fri May 18, 2012 6:28 am

Re: Our New 2012 PRHT SS Project....

Post by Chuck H »

The Helmholtz resonator looks to be just about exactly the same size as the regular in-line one, so the main difference is the extra 18" of pipe that runs next to it. 2.5" stainless exhaust pipe weighs 0.9 lbs/foot, so that section of pipe weighs about 1.5 lbs.

If the regular midpipe resonator is an empty expansion chamber, then this one probably weighs almost 2 lbs more, with the additional pipe, mounting bracket, and inlet to the resonator. If the regular midpipe resonator is more like a glasspack with a perforated tube and sound absorbing material inside, then I'd guess the difference is less than a pound.
2019 Arctic White RF GT-S
SmartTop, coilovers
Brian
Site Admin
Posts: 11307
Joined: Tue Feb 15, 2005 11:44 am
Location: San Diego CA
Contact:

Re: Our New 2012 PRHT SS Project....

Post by Brian »

Chuck got it right, normal big packed resonator uses high density packing so weight difference is close to nothing since the Helmholz chamber is empty. You can't see it on the dyno, nothing running through it, etc.
Brian Goodwin
Good-Win Racing
www.good-win-racing.com
colt45
Posts: 20
Joined: Fri Nov 18, 2011 5:53 am

Re: Our New 2012 PRHT SS Project....

Post by colt45 »

re Resonator:

It's not real without sound clips! Panting in anticipation! :mrgreen:

How many more dB is it louder at WOT and say 4k+ than the stock midpipe? I have a Q muffler and no other exhaust mods, yet. As it's aged, the boom has gotten louder, but it has always had a delicious sound revving with my foot in it, especially with the baffles out.

Oh! I found the videos! Cool! Curiously, you didn't let the RPM fall far enough to get to the worst resonance RPM of my car, 1750 indicated. What does it sound like there?

Last week, I got to hear a Miata with your headers, mid-pipe and Roadster Sport single muffler. How does the sound of the Helmholtz mid-pipe and the RS SuperQ sound in comparison while accelerating, both loudness and tone?
Chatanooga
'06 Sport 6MT Ohlins 70N/50N
IBA/COG
dmicah
Posts: 35
Joined: Wed Aug 15, 2012 12:02 pm
Location: Seattle

Re: Our New 2012 PRHT SS Project....

Post by dmicah »

Curious about impact on HP, if any. Also, any thoughts on whether this part will be better, worse, or the same as your original midpipe WRT clearing the IL Motorsport and other braces? Thanks!
Brian
Site Admin
Posts: 11307
Joined: Tue Feb 15, 2005 11:44 am
Location: San Diego CA
Contact:

Re: Our New 2012 PRHT SS Project....

Post by Brian »

No impact on HP. No change in fitment with braces.
Brian Goodwin
Good-Win Racing
www.good-win-racing.com
burnt rubber
Posts: 1
Joined: Sat Sep 19, 2015 3:31 pm

Re: Our New 2012 PRHT SS Project....

Post by burnt rubber »

My first post.

Brian,

Thank you. Thank you. Thank you.
I am really impressed with your dedication to product development and your willingness to share information on the forum. Been following the progress of Our New 2012 PRHT SS Project so I can use it as a template for my car.

Just purchased my first 2011 Miata on 9/3/15 as a daily driver. It had no muffler on it. Straight pipes. Put a Super Q muffler on it quickly.

It could have taken me months to research and determine what parts or mods to do to my car. You have made my decisions so easy. Within 30 days it will be done….mostly.

I was at Rocky’s Miatomotive on 9/19 having him install the Progress sway bars, Progress springs, Koni Sport shocks. What a big difference in ride quality.

Thank you for the ride in the 2012 PRHT SS Project car last Saturday. What a treat. I was not expecting that. The RS Helmholtz midpipe you have on the car is really impressive at reducing the drone. The 2500-1500 rpm drone is gone. I am ordering the Roadster Sport street header and RS Helmholtz midpipe next week.

Even my wife is starting to like the Miata now. Really!!! Except for that clutch thingy. :mrgreen:

Daniel
Brian
Site Admin
Posts: 11307
Joined: Tue Feb 15, 2005 11:44 am
Location: San Diego CA
Contact:

Re: Our New 2012 PRHT SS Project....

Post by Brian »

More Pics..
Attachments
Rubby-MX5.jpg
Ruby-MX5-big.jpg
Brian Goodwin
Good-Win Racing
www.good-win-racing.com
Brian
Site Admin
Posts: 11307
Joined: Tue Feb 15, 2005 11:44 am
Location: San Diego CA
Contact:

Re: Our New 2012 PRHT SS Project....

Post by Brian »

This project car is FOR SALE. Current Mileage Just 16,297.

We sold this project car 1.5 year ago... and new owner drove it for 1.5 year and then bought a new Jaguar drop top, so this car is available for sale. Owner is seeking just bluebook for an amazing and nicely prepared PRHT. Contact us if interested and we can put you in touch with the current seller.
Brian Goodwin
Good-Win Racing
www.good-win-racing.com
Post Reply