|
Superformance side pipes
We just tried a set of our new 3 inch I.D. stainless steel mufflers welded into a stock Superformance exhaust system. Early results on a stroked 351 W looked good on the torque( +27). The horsepower only went up around 10 on the first test, but the air fuel with the old mufflers was around 12.9 to 1, and with the new ones ,it jumped up to 14.6 to 1. The stock Superformance muffler is only around 2.250 on the I.D. We have allways felt on our higher H.P. motors, the pipes were a big factor on the H.P. loss from our engine dyno, to our chassis dyno. I think Tuesdays dyno results will be interesting. I will be changing jets and timming in the morning. I think the big blocks will really wake up with these new mufflers. When the testing is done ,we will re-ceramic coat the side pipes back to the original color, and the system will look stock. The mufflers are the same length and O.D. as the stock ones, so no one will know you have made the change. Oh, and the sound is much deeper, and I love it.:)
|
sweet
We hope to see some power increase with our 3.5" ID straight through stainless tube with a cone insert as a muffler, might be a tad loud though. Good to see some good HP numbers!
Thanks |
Would be VERY INTERESTED to learn what jet changes you ended up performing (carb type and size, and from jet size X to Y). Also any timing adjustments. I'm doing the same exact mod on a stroked 351W (RDI 392). Bought the mufflers from Stainless Specialties. There is a third SPF owner that has bought the same ones, too, and recently put them on (unless your customer is "Karl", then we are talking about the same car).
Thanks, -Dean #747 |
Eric....do you plan on selling this new muffler system for SPF cars after you are done with testing??
|
Yeah, how much?
|
blykins, if the cores he used are the same ones that I had fabbed, they run about $160 each, plus shipping. You would then be on your own to have a local welder do the cuts and welds to "section" them in place of the factory glass (steel wool) packs.
I have a call in to my fab guy now. Once he confirms when he'll be back in his shop, then my pipes come off and I get him to work. :D Here's a link to my original thread (hope it works). It has pics of the cores. http://www.clubcobra.com/forums/show...123#post566123 |
Any more progress on these Eric? Final dyno numbers, price, availability, pics??
:confused: Very intrested.... |
Re: sweet
Quote:
Sid:confused: |
I am done with the pipes . I will post the dyno numbers over the weekend. I have been very busy getting our Cobras done, and have not had time to get on the net for the last couple of days. The price will be around 1000.00 to 1200.00 depending on the color. Sorry it is taking so long. So many Cobras,so little time!
|
Hey Eric -
Re: pricing = $1000 to $1200 1. Is this just for the muffler insert or the complete sidpipe? 2.Is this each or per pair? Thanks, Steve |
Eric, are these the same cores I bought from Stainless Specialties? BTW, dropped my pipes off at the local Jet-Hot coat facility yesterday. Will have a full pictoral of the fab work later tonight on CC.
-Dean #747 |
Quote:
I'm certainly looking forward to the results! :3DSMILE: |
I will try to post the graphs on Saturday or Sunday. Here are the peak numbers. Fist run with original stock mufflers. HP 431 and torqe 417. After the new mufflers were installed, and we re-jetted to get the air fuel back to the original settings. HP 451 and torque 435. This is on a 408 windsor with AFR 205 heads and a victor jr intake manifold. 825 carb. and a hydralic roller with around .600 lift. RedBarchetta, I think our muffler is almost the same as the muffler you are talking about. Hope this helps.
|
SPF 1061, The posted price will be for an exchange of a complete set of side pipes, with new mounting brackets and hardware.
|
Eric,
Thanks for posting the dyno numbers. Some may argue that the 20HP increase is not a lot considering the cost outlay, but it's a combination of the factory mufflers and the headers that really rob the power on a Superformance. I will probably tackle the headers next year (there are offerings out there that smooth the bends exiting the exhaust ports). Or I might just take my old ones to Alex and tell him "Here, improve these, will ya?!?" :D I posted my fabrication shots in my previous thread...take a look when you get a moment. -Dean P.S. The I.D. on my stock Superformance mufflers was 2.0" exactly. Are you working on a new model...perhaps they increased the I.D. slightly since more and more owners are installing big blocks now? |
Eric.......Great results.
Could you advise what jets the 825 carb was running before & after to get your motors AF down from 14.6 to the 12's ?? |
Re: sweet
Quote:
|
No graphs yet?
|
| All times are GMT -7. The time now is 01:56 AM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: