Originally Posted by lovetoturn

Originally Posted by JCR-Porsche

We have a customer who is willing to help with the data gathering so we will be completing the back to back dyno at an independent dyno shop with proper testing techniques and logs and will follow up / back up each result with 100-200kph runs. 100% stock 718 GT4 with only our rear silencer replacement and approx 5000 miles.

As part of the dyno test we will also log AIT's and run with and without fans to demonstrate the point that im making above.

Planning to be able to get this test completed on 20th of this month, everything within one day. It's a little more difficult as im not prepared to run / publish 100-200kph testing on the road. Tests mean nothing without accompanying video of the run so we will be completing the runs on track at Donington Park.

JC

Originally Posted by Dr.JDK

I just installed the JCR non-silenced rear section. To me, the biggest selling points are the impeccable built quality and the tremendous sound. It is only the rear section but it changed the tone from all RPM ranges completely with nearly no adverse effects (i.e. drones, raspy, etc.).
I also found that with the JCR exhaust, the ticking noise from the engine is less noticeable.
My verdict: the JCR exhaust will add a virtual 2k rpm to the actual engine rpm from a sound perspective with a very classy tone. It is, IMO, the best after-market exhaust for the 982 4.0 platform.

Originally Posted by xstnte

I had the opposite occur, the car gained almost 30hp from the JCR exhaust manifold—everything else being stock. The gains and change in power delivery were like two different cars, I should probably make my own thread as not to hijack this one, but was incredibly surprised how much the JCR headers uncorked the engine,

Originally Posted by JCR-Porsche

I really doubt that logged / PIWIS measured AIT's matched ambient temp within a couple of decimal points, thats almost impossible, especially with no fans by the side air intakes.

We have a customer who is willing to help with the data gathering so we will be completing the back to back dyno at an independent dyno shop with proper testing techniques and logs and will follow up / back up each result with 100-200kph runs. 100% stock 718 GT4 with only our rear silencer replacement and approx 5000 miles.

As part of the dyno test we will also log AIT's and run with and without fans to demonstrate the point that im making above.

Planning to be able to get this test completed on 20th of this month, everything within one day. It's a little more difficult as im not prepared to run / publish 100-200kph testing on the road. Tests mean nothing without accompanying video of the run so we will be completing the runs on track at Donington Park.

JC

Originally Posted by 4lflat6

Can you please make good on this promise and share the outcome of this test? I am very curious to see any indication of performance gain for the JCR Non-silenced Race Pipes alone other than the Spyder.

Originally Posted by 4lflat6

Yeah headers are more likely to add power than the backbox.. I really can't comment on headers, or JCR race pipes in conjunction with OAP. Just saying the JCR racepipes alone, in my car led to power reduction.

Originally Posted by Alpha Ice

I threw on the JCR Manifolds, and I can feel a big different in both regular and sport modes of how the car pulls between running the factory PSE valves open, and forcing the valves open. While I realize this is quite a bit upstream compared to your exhaust, it does tell me that the factory exhaust is quite limiting in how it allows air through. I would have to say that anything other than stock (if done under the right conditions) would and should be an improvement...especially when you consider the 20 lbs of weight savings alone. Just my .02 cents.

Originally Posted by ashgaunt

hi I don’t see anyone here talking about chipping it? I chipped my GTS 4.0 pdk and the difference was slightly noticeable. After I put filters and the jcr on it is actually brutal. More wheelspin possible when pulling away in 1st but on wet days the rears can actually light up in 3rd at over 100mph when the revs hit 6k. Going to dyno it but it’s a massive difference. I always run it on 99.

Originally Posted by JCR-Porsche

You're not imagining those gains

The latest post DRAGY thread once again proves that our parts make power and work in real world scenarios..

Unfortunately this thread still gets brought up in conversation with me at least once a week. It's really a shame that one dud test result amongst the hundreds of positive reviews and experiences can cause so much damage to a company.

JC

Originally Posted by Avera

Jonny

Did it cause damage? All I know and hear is how great JCR exhaust solutions sound.

The downside to rear box solutions is mixing them with high-flow headers/OAPs. DRONE . . . but that is not unique to JCR, rather, a characteristic of the chassis and anyone in the game at this point knows the give and take involved.

Avera