JCR // Titanium Race Exhaust (GT3 RS OPF / SPEEDSTER)
#31
I just wanted to take a minute and comment on the amazing service JCR have provided.
Good, honest people highly skilled in their craft. I can’t wait to share the system on my car very soon!
Good, honest people highly skilled in their craft. I can’t wait to share the system on my car very soon!
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JAM2 (11-04-2019)
#33
Instructor
#34
#35
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We will be sharing a ton of specific data next week once we complete the dyno testing including dB meter readings.
We will also be sharing results from a car on-track too so all relevant dB meter readings will be shared at that point.
JC
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Jangobipbip (10-25-2019)
#36
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The parts are now live on our site and available to order now
991 GT3 RS (OPF) / Speedster - EXHAUST PRODUCTS
JC
991 GT3 RS (OPF) / Speedster - EXHAUST PRODUCTS
JC
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JonathanWalker (10-19-2019)
#37
I think you live around the block from me. Are you the guy with a carbon’d up grey RS? Please would it be possible to hear your car as I’m thinking of putting an exhaust on mine?
Thanks
#39
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In reality I’ll probably put some things out prior to that as it’s already been tough holding back the results!
JC
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pr0b3 (10-25-2019)
#40
hmmmmm... I'm so curious
#41
JC - curious. Were you able to dyno both the EU Speedster with OPF as well as the WoW Speedster with the metal mesh in place of the OPFs? If yes, curious if the baseline dyno was different between the two systems before and after adding your "can't wait" system.
#42
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Great couple of days testing, went very well. I’ll be compiling the data video and images over the weekend and sharing Monday..
In the mean time a teaser video below
This is with the non silenced OPF Race Pipe installed.. It sounds absolutely glorious!
JC
#43
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Hey all,
A day behind what we promised so I must apologise however we have got the footage together and created a video attached below showing our dyno test results from the 991.2 GT3 RS installed with factory OPF
Below we have gone into a little more detail about the testing. Worth noting that this dyno is a linked dyno and the car was placed into dyno mode using the factory Porsche tool to ensure consistent results. AIT's were monitored and all tests were performed within a 3 hour time window. The ambient temp crept up in the dyno cell during the testing which could well have lowered the results for the JCR exhaust figures but we're ok with that.
Baseline Figures
We were pretty surprised to see the baseline figures so strong after reading so much about the OPF cars being slower than the previous generation. I guess Porsche managed to claw more back with the ITB / plenum arrangement and quite possible that they're leaning on the motor a little harder too. Either way the figures are very solid with the measured 449.69whp & 317.60whp sitting as an estimated 530.63 crank HP & 374.76 crank TQ.
Of course the purpose of this test is not to focus on the headline figures, only to compare the deltas but using the recommended 18% driveline loss calculation recommended for this particular dyno when running in lined 4WD mode this is where we ended up.
JCR OPF Titanium (Silenced) Race Pipe
After the baseline testing we installed the JCR Titanium (Silenced) Race Pipe to compare vs OEM
Results
Key points
The results we're extremely encouraging, picking up torque in the low rpm was a little unexpected and gains were found throughout the full curve smoothening areas in the OEM curve which could be associated to valve switchover with the electronically controlled valves.
We also found that another added benefit is just how much less prone the car is to gaining temperature, the reduction of temps were very apparent vs OEM and as a result the consistency of the results were improved upon.
JCR OPF Titanium (Non-Silenced) Race Pipe
The final configuration was our non silenced version, offering maximum weight saving and added sound.
Results
Key points
Again similar results to that found with the silenced version of our Race Pipe with torque gain low down and eventually ending up a touch stronger at the top end all accompanied with that signature JCR sound. Again the consistency was improved over OEM with the heat build up and recovery much improved, in the real world this will be even more apparent.
Overall extremely happy with the results, not only a vast improvement in sound but excellent weight savings and proven gains in power and torque vs OEM
As ever, any and all questions are very much welcomed!
JC
A day behind what we promised so I must apologise however we have got the footage together and created a video attached below showing our dyno test results from the 991.2 GT3 RS installed with factory OPF
Below we have gone into a little more detail about the testing. Worth noting that this dyno is a linked dyno and the car was placed into dyno mode using the factory Porsche tool to ensure consistent results. AIT's were monitored and all tests were performed within a 3 hour time window. The ambient temp crept up in the dyno cell during the testing which could well have lowered the results for the JCR exhaust figures but we're ok with that.
Baseline Figures
We were pretty surprised to see the baseline figures so strong after reading so much about the OPF cars being slower than the previous generation. I guess Porsche managed to claw more back with the ITB / plenum arrangement and quite possible that they're leaning on the motor a little harder too. Either way the figures are very solid with the measured 449.69whp & 317.60whp sitting as an estimated 530.63 crank HP & 374.76 crank TQ.
Of course the purpose of this test is not to focus on the headline figures, only to compare the deltas but using the recommended 18% driveline loss calculation recommended for this particular dyno when running in lined 4WD mode this is where we ended up.
- Weight Saving - N/A
- 449.69whp (530.63bhp)
- 317.60whp (374.76bhp)
JCR OPF Titanium (Silenced) Race Pipe
After the baseline testing we installed the JCR Titanium (Silenced) Race Pipe to compare vs OEM
Results
- -12.08kg (26.63lbs) Weight Reduction vs OEM
- 460.82whp (543.77bhp) // +11.13whp (+13.14bhp) vs OEM
- 323.03wtq (381.18tq) // +5.43wtq (+6.42tq) vs OEM
Key points
The results we're extremely encouraging, picking up torque in the low rpm was a little unexpected and gains were found throughout the full curve smoothening areas in the OEM curve which could be associated to valve switchover with the electronically controlled valves.
We also found that another added benefit is just how much less prone the car is to gaining temperature, the reduction of temps were very apparent vs OEM and as a result the consistency of the results were improved upon.
JCR OPF Titanium (Non-Silenced) Race Pipe
The final configuration was our non silenced version, offering maximum weight saving and added sound.
Results
- -13.86kg (30.55lbs) Weight Reduction vs OEM
- 461.62whp (544.71bhp) // +11.93whp (+14.01bhp) vs OEM
- 319.86wtq (377.43tq) // +2.26wtq (+2.70tq) vs OEM
Key points
Again similar results to that found with the silenced version of our Race Pipe with torque gain low down and eventually ending up a touch stronger at the top end all accompanied with that signature JCR sound. Again the consistency was improved over OEM with the heat build up and recovery much improved, in the real world this will be even more apparent.
Overall extremely happy with the results, not only a vast improvement in sound but excellent weight savings and proven gains in power and torque vs OEM
As ever, any and all questions are very much welcomed!
JC
#44
Very nice results Jonny !
Here is proof to the "speculators" that the OPF-ITB car has "less power and is slower"
Decibel information ?
Here is proof to the "speculators" that the OPF-ITB car has "less power and is slower"
Decibel information ?
Last edited by EST; 10-29-2019 at 02:54 PM.