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It's been some time coming but i'm extremely please to announce the official release of the JCR Inconel Race Manifolds!
We have been working on the final production version of our manifolds for quite some time and now we have covered a sufficient amount of mileage on the parts to feel completely satisfied and ready to release.
If you have any questions at all regarding any of the info below please do not hesitate to ask.
We have a production run of 25 sets under way now with 8 sets currently spoken for from customers who have been patiently waiting.
Thanks again and I hope you all like what you see!
JC
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Introduction
Developed specifically in conjunction on the later gen 4.0L motors found in the 991.1 GT3RS and 991.2 GT3 & RS we feel we have developed a fantastic modular lightweight solution that brings significant increases power and torque in a package which has been proven over 1000's of miles of road and track use on our own 991.1 GT3 RS and a US based 991.2 GT3 RS to avoid any CEL on both platforms but also produce real world performance advantage on the street and track.
Why Inconel?
We believe in no compromise, this is why our headers are produced from super high grade Inconel 625, only the best here.
Weight Savings
An overall reduction in weight of 2.65kg / 5.84lbs compared to the OEM exhaust manifolds, not insignificant when the weight is all rear of the rear axle!
Modularity & Fitment
One big positive for the JCR Inconel Race Manifolds in comparison to many aftermarket manifolds which produce proven gains is their modular fitment capabilities. A true direct replacement for the OEM exhaust manifold enabling customers to enjoy a wider range of exhaust configurations from various manufacturers (if they so wish)
We also retain the single piece flange design in order to make fitment a breeze and importantly none of the primaries cover direct access to the head studs again ensuring a simple, quick and perfect fitment every time.
Fitment with all versions of factory under tray also, no requirement for modification.
Will I get a CEL
On the tip of the tongue of many customers is the question regarding CEL, especially with the later cars.
While we cannot and will not state there is 'zero' chance of a CEL we can only refer to our own testing and real world experience and comment that its highly unlikely, regardless of the model that you will encounter a CEL with our headers installed.
Some of you who attended the 2019 Smokies event will recognise the car with our manifolds, that particular car has been driven well over 2500 miles with the JCR headers installed without any CEL, in short, it is possible to run catless on the 991.2 generation cars without encountering any CEL.
Performance
We have included our dyne test results below together with all relevant information. In summary, very Interesting results, the peak HP / TQ figures and the shape of the curve. Config 2 (JCR) showed great improvements with a peak delta of 30.90hp and 9.49tq at the wheels compared to that of the OEM exhaust manifolds in our testing on our 991.1 GT3 RS.
In combination with our Race Pipe products our Race Manifolds make for a formidable combination, truly extracting the maximum from the exhaust possibilities together with a sound which cannot be compared to anything but the 991.2 RSR. Again referring back to the 991.2 GT3 RS attending the Smokies 2019 event with our Headers installed, peak speeds on the straights we're extremely impressive, demonstrating excellent real world performance increase!
Dyno Testing
Firstly the factory Porsche PIWIS III tool was used to lock the car into dyno (roll) mode as to prevent any electronic interference due to running the car in 2WD on the Dynapack hub dyno. This is to ensure that the results are not affected in any way. Linked dyno’s will still cause torque inconsistent interference from the ECU when the car is not in ‘Roll Mode’ and with us running the car on a Dynapack hub dyno this meant due to the the stationary front wheels it would be impossible to test without access to this factory tool.
All tests were conducted in 5th gear with AIT monitored with both the dyno's own temperature probe as well as the Porsche PIWIS III tool via OBD logging to ensure the car was not torque limiting due to any unforeseen reasons which again could have an effect on the consistency of the results.
We selected 5th gear as we feel this is the most representative gear for circuit driving, most circuits you peak around the top of 5th gear. Running in 4th gear yields better results of course (and we tested this also) but importantly all runs were completed in 5th for absolute consistency.
The car was ran on Shell V-Power 99RON throughout the day, one tank, no changes. This RON rating of 99 converts to US AKI or (R+M)/2 - 93. So nothing special here. More info below on the fuel used during the dyno test.
For each and every run the position and fan speeds were all consistent. We monitored AIT’s with the Porsche PIWIS III and with the Dyno’s own temp probe, the delta between the two was never more than 2 degrees C and importantly all runs were below the magic 68f / 20c with the ECU kept happy and in its optimum map.
We completed a total of 8 power runs on the dyno per configuration, allowing the car to cool adequately between runs (1min) as to not skew the results. We found that during the first 3 runs the results would settle, with the 4th / 5th / 6th run being very consistent to one another and depending on the set up the 7th & 8th run starting to show the effects of higher AIT (more on that later)
You’ll notice that throughout this test we have our Superlight Titanium Tips installed. This is consistent between all runs during the whole dyno test with the JCR Superlight Titanium Tips being installed. The reason for this is due the material and weight the JCR Titanium Superlight Tips cool so much faster than the OEM tips it allowed for far faster exhaust swaps during the course of the dyno test. In (Part2) of our dyno test results we completed a comparison between OEM and JCR tips to ascertain if there was any performance advantage but importantly for this particular test the tips were consistent across all configurations tested.
Now, onto the testing and results..
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Manifold Comparison Test Brief
In this section of the dyno test we will be testing our new JCR Inconel Race Manifolds vs OEM Manifolds / OEM Exhaust
The baseline for this test is of course the factory set up (plus JCR Titanium Tips) which we will refer to as Config1, this will be our start point.
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CONFIG 1 -OEM Manifolds/OEM Side Silencers /OEM Centre Silencer/JCR Titanium Tips
Total Exhaust Weight (35.06kg / 77.30lbs) Weight saving (-1.08kg / 2.38lbs) vs 100% OEM exhaust
Brief
The purpose of this test was to create a solid baseline for the OEM exhaust system to use as the benchmark for the subsequent exhaust configurations tested.
Results
Ambient Air Temperature - 10c
Air Intake Temperature - 11c
The baseline data is as you would expect and in line with figures logged from other 991.1 GT3 RS on similar dyno’s / weather conditions / fuel etc.
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CONFIG 2-JCR Inconel Race Manifolds/JCR Titanium Valved Side Silencer Bypass /OEM Centre Silencer/JCR Titanium Tips
Total Exhaust Weight (14.93kg / 32.92lbs) Weight saving (-20.13kg / 44.38lbs) vs Config 1 Weight saving (-4.43kg / 9.77lbs) vs Config 2
Brief
Swapping out the OEM exhaust manifolds & side silencers we then install the JCR Inconel Race Manifolds together with our own JCR Titanium Valved Side Silencer Bypass in combination with the factory centre silencer & JCR Titanium Tips in order to achieve a representative set of results based on running a comparable set up.
Results
Ambient Air Temperature - 10c
Air Intake Temperature - 11c
Very cool product. Another benefit of going catless would be the possibility of using better than Porsche-approved motor oils that aren’t designed with the requirement of extending the life of the cats to 8 years (government mandated emissions warranty period), like Motul 300V or similar. A shame to offer less engine protection just for the benefit of not replacing cats under warranty.
Are you still planning to also offer a super-light version with thinner gauge inconel or these projects were merged to one offering?
Depending on how loud the bypass pipes and race headers are, I may pair them with the quiet Dundon center muffler to keep my neighbors from complaining.
Would this make any sense for someone who is looking for a little more sound that is already running a rear center bypass? Would there be any gains or sound change?
Would this make any sense for someone who is looking for a little more sound that is already running a rear center bypass? Would there be any gains or sound change?
I think you'd pick up some power and sound from losing the cats. Not sure how much (if any) the factory side mufflers would restrict the potential...
Would this make any sense for someone who is looking for a little more sound that is already running a rear center bypass? Would there be any gains or sound change?
Very cool product. Another benefit of going catless would be the possibility of using better than Porsche-approved motor oils that aren’t designed with the requirement of extending the life of the cats to 8 years (government mandated emissions warranty period), like Motul 300V or similar. A shame to offer less engine protection just for the benefit of not replacing cats under warranty.
Are you still planning to also offer a super-light version with thinner gauge inconel or these projects were merged to one offering?
A factor that until now i'd not really considered. Personally I would tend to stick with the Porsche approved oils however I guess this does open up the possibilities without the fear of cat damage.
For the manifolds we will be offering a SL version in the future however we're running some extended testing at the moment to ensure that we're totally satisfied with long term durability.
Originally Posted by drdonger
Would love to hear videos of or see results of headers with race pipes.
Depending on how loud the bypass pipes and race headers are, I may pair them with the quiet Dundon center muffler to keep my neighbors from complaining.
The beauty of our products is that they're all modular so this could be a great option if you're looking for something a little quieter than the OEM centre without the worry of potential cracking on track etc.
Originally Posted by stephen k
Would this make any sense for someone who is looking for a little more sound that is already running a rear center bypass? Would there be any gains or sound change?
This isn't a set up which we have tested (yet) however the OEM side silencers really do not rob any power / torque. Really the reason to swap out the OEM side silencers in my opinion is for weight savings, heat reduction in the wheel well area along with the added sound.
Our manifolds delete the cats and due to the primary lengths, collector design and material the sound is elevated some what over the OEM headers. This would certainly bring a new lease of life to the sound whilst retaining very quiet zero drone driving with the OEM valves closed.
Would this make any sense for someone who is looking for a little more sound that is already running a rear center bypass? Would there be any gains or sound change?
Originally Posted by hashash
+1 ?
Did either of you ever end up doing this?
Kicking around that same setup. Inconel race headers + Titanium Center Bypass/OR Titanium Superlight Center Bypass. (what's the difference by the way? They're a very different design).
05-24-2019, 01:29 PM
JCR // INCONEL RACE MANIFOLDS (NEW PRODUCT)
