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JCR // DYNO TEST (Part1) - JCR vs OEM vs XXXXXX Headers

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JCR // DYNO TEST (Part1) - JCR vs OEM vs XXXXXX Headers

 
Old 01-30-2019, 02:47 PM
  #16  
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Originally Posted by A/S View Post
jonny

When are these headers ready for shipment? I'm afraid that my JCR Silenced Race Pipes are going to get louder, but I can see another 12 hp on your headers compared to the Akrapovic headers I have, weight about the same, but Inconel is better for headers than the Titanium I currently have (although I have never experienced a failure or cracks on any of my former and current Akrapovic Titanium exhaust products).

The power curve on your prototype inconel headers looks nicer on the top end than the power curve on my Akrapovic Titanium/Catted headers. The weight differences between these two is small, but your headers seem to be doing a nice job at the top end.

Please, take some sound measurements and compare them to the stock headers + JCR Silenced Race Pipes, I need to asses if I'm going to need special turn down pipes (I already have a pair that reduces sound by 2-3 dB).

Thanks,
Headers we will be launching next week (Monday 4th)

I have all of that data regarding the dB measurements when combined with Silenced Race Pipes and also we have our Race Pipe specific (larger internal diameter) 'Titanium Silenced Tailpipes' with or without downturns also ready now which reduce by 2-3dB when installed as you mention above.

Superlight Centre Bypass, Inconel Race Manifolds, Race Pipe Silenced Tailpipes all being launched next week. Its a busy old time at the moment but awesome to see customer feedback and enjoying our products

JC
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Old 01-30-2019, 04:11 PM
  #17  
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Love it, guys. Now when's the 997 GT3 stuff coming
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Old 01-30-2019, 04:51 PM
  #18  
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Do these cause CEL/need a tune?
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Old 01-30-2019, 06:51 PM
  #19  
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Originally Posted by mdrums View Post
I thought that too...went on the Dundon website and looked and only saw long tube style headers...nothing that had the bends on the tubes like JCR is showing.
Maybe fabspeed...but not their new long tube headers.
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Old 01-30-2019, 07:00 PM
  #20  
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Originally Posted by KBS911 View Post
Maybe fabspeed...but not their new long tube headers.
Ooops, no. Not Fabspeed.
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Old 01-30-2019, 07:20 PM
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all signs point to dundon, the fact that they're referred to as XXXXXX (DUNDON), described as "highly regarded and proven alternative," and the pictures pretty much speak for themselves:

https://www.dundonmotorsports.com/99...flaps?carid=40

not sure about all the confusion
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Old 01-30-2019, 10:40 PM
  #22  
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Originally Posted by ilovecarbs View Post
all signs point to dundon, the fact that they're referred to as XXXXXX (DUNDON), described as "highly regarded and proven alternative," and the pictures pretty much speak for themselves:

https://www.dundonmotorsports.com/99...flaps?carid=40

not sure about all the confusion
Man I’m an idiot....I was reading the post wrong somehow thought the ones on the right where the XXXXXX headers....ok yeah I see it now I get it...thanks.LOL ;-)
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Old 01-30-2019, 11:00 PM
  #23  
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Intereted to see if these headers as are or after some tinkering can keep the MIL off on .2 cars 95%+ of the time.

It will also be interesting to see if .2 cars show torque limiting at the top end. If Dundon is getting torque limiting on the .2, these should too though that would only impact the peak power.
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Old 01-30-2019, 11:14 PM
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Originally Posted by PhilT3 (PT3) View Post


The long-tube headers that JCR is showing in Config 2 above are the competitions. The ones with the bends in Config 3 are JCR.
thanks...I wasn’t paying attention enough...lol
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Old 01-31-2019, 04:09 AM
  #25  
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Originally Posted by MatthiasAK View Post
Love it, guys. Now when's the 997 GT3 stuff coming
We do have a 997 GT3 lined up to come in where we will be testing fitment of all of our 991 GT3 products, just to verify and make any necessary adjustments. Will keep you posted via PM on that

Originally Posted by DerStig View Post
Do these cause CEL/need a tune?
We have done what's possible with the hardware to give us the best possible chance of avoiding a CEL after installation of these headers. As most are aware, the .2 cars are more sensitive in this area too. We would never claim to have a 100% reliable fix as I don't believe there is zero chance of a CEL without some additional electronic trickery. All I would say is that in our own testing we have never experienced a CEL with these headers installed on the 991.1RS and our previous 991.2GT3 so although I would never claim its 'impossible' I would happily say that its highly unlikely.

No requirement for a tune. We understand that the vast majority of owners are not willing to open up the ECU and void warranty with Porsche so the headers have been developed with that in mind. Thats not to say that larger gains couldn't be had optimising the map after installation however if we were developing the headers together with an ECU tune then there would have been some subtle changes to the design.

As it is im satisfied that we have a solid reliable solution which makes great gains all within the constraints of the factory headers geometry. Also, fitment on the .1 and .2 cars is no problem, no requirement to trim / adjust the .2 under tray.

JC
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Old 01-31-2019, 06:54 AM
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Originally Posted by mdrums View Post


Man I’m an idiot....I was reading the post wrong somehow thought the ones on the right where the XXXXXX headers....ok yeah I see it now I get it...thanks.LOL ;-)
I'll join the club. Thought the same thing initially.
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Old 01-31-2019, 08:48 AM
  #27  
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This is fantastic, great job JCR! A real value for many of us is the modular setup of your system. Quick question, would your race headers work with another well respected and proven valved side muffler bypass (hint: TPC Racing valved side muffler bypass)? This way I can pick up your Inconel manifolds/headers and Inconel exhaust tips.Thanks
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Old 01-31-2019, 11:54 AM
  #28  
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Searching the Dark Web I found the JCR manufacturer's Cheat Sheet:

XXX = JCR
XXXXXX = Dundon
XXXXXXX = Porsche
XXXXXXXX = Fabspeed
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Old 01-31-2019, 01:20 PM
  #29  
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Originally Posted by Akunob View Post
This is fantastic, great job JCR! A real value for many of us is the modular setup of your system. Quick question, would your race headers work with another well respected and proven valved side muffler bypass (hint: TPC Racing valved side muffler bypass)? This way I can pick up your Inconel manifolds/headers and Inconel exhaust tips.Thanks
Thanks for the compliments! Yes, 100% and this is why it was important to us that all of our exhaust parts are 100% modular and directly replace the OEM item with zero modification. We appreciate that many owners like to mix and match parts and we do not believe that if you run our headers that means you should be restricted to running only JCR items, as per Akrapovic etc.

As I mentioned earlier, choice is a wonderful thing!

Originally Posted by Alan C. View Post
Searching the Dark Web I found the JCR manufacturer's Cheat Sheet:

XXX = JCR
XXXXXX = Dundon
XXXXXXX = Porsche
XXXXXXXX = Fabspeed
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Old 01-31-2019, 03:25 PM
  #30  
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JC nicely done, keep up the good work! An alternative to factory headers that can mate up to existing side muffler bypass pipes...I'll keep that in mind

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