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sw20kosh · 05-20-2014, 02:53 AM

So... a month or so ago my catalytic converter in the stock manifold disintegrated while tuning the ptuning turbo kit on my car (did a pull with the cam's not online yet = ran very rich). Luckily no damage to the engine/turbo.

I needed to get a header sooner rather than later in order to continue with tuning this system. I put in an order for the JDL UEL as they were having a sale and were shipping them out real quick.

While waiting for the header to arrive I gutted the stock manifold - removing the remains of the catalytic converter. Tuning resumed on this frankenstein header and we were actually making decent progress. VE had increased and the torque was holding to redline. We went through 8 or so revisions in order to dial this manifold in.

Three weeks after ordering, the JDL UEL came and I installed it instantly. The results speak for themselves. I am pretty blown away by how much it has improved the VE of my setup. The gains are great especially considering @jamesm hasn't had a chance to tweak the tune for this new header. We knew the stock manifold wasn't ideal but we didn't know it was this bad. Conversely the JDL UEL may just be freaking unicorn magic. @Jesse@JDLAutodesign @ptuning

Virtual Dyno on same flat road, same day. 3rd gear pulls. ACN91 octane.
Yellow is gutted stock manifold. This is consistent with previous pulls showing anywhere from 265-280 whp.
Red and Blue are two runs of the JDL UEL untuned.

Note: You can see where the VE probably increased (where the AFR leans out in the upper rpms). Spool improved too.

Here is boost and knock correction. 3rd gear pulls and same road same day.
Top chart is JDL UEL.
Bottom chart is stock gutted manifold.

Even with it leaning out a bit (wideband log showed a max of 12.8 AFR in the 6-7k zone) and the tune not even being tweaked, there is no knock correction.

Hope this sheds some light on just how bad the stock manifold is (at least for turbo applications that retain it).

05-20-2014, 02:53 AM	#369
sw20kosh Senior Member Join Date: Jul 2012 Drives: 2013 Black FR-S Location: SF Posts: 3,030 Thanks: 881 Thanked 2,014 Times in 990 Posts Mentioned: 153 Post(s)	So... a month or so ago my catalytic converter in the stock manifold disintegrated while tuning the ptuning turbo kit on my car (did a pull with the cam's not online yet = ran very rich). Luckily no damage to the engine/turbo. I needed to get a header sooner rather than later in order to continue with tuning this system. I put in an order for the JDL UEL as they were having a sale and were shipping them out real quick. While waiting for the header to arrive I gutted the stock manifold - removing the remains of the catalytic converter. Tuning resumed on this frankenstein header and we were actually making decent progress. VE had increased and the torque was holding to redline. We went through 8 or so revisions in order to dial this manifold in. Three weeks after ordering, the JDL UEL came and I installed it instantly. The results speak for themselves. I am pretty blown away by how much it has improved the VE of my setup. The gains are great especially considering @jamesm hasn't had a chance to tweak the tune for this new header. We knew the stock manifold wasn't ideal but we didn't know it was this bad. Conversely the JDL UEL may just be freaking unicorn magic. @Jesse@JDLAutodesign @ptuning Virtual Dyno on same flat road, same day. 3rd gear pulls. ACN91 octane. Yellow is gutted stock manifold. This is consistent with previous pulls showing anywhere from 265-280 whp. Red and Blue are two runs of the JDL UEL untuned. Note: You can see where the VE probably increased (where the AFR leans out in the upper rpms). Spool improved too. Here is boost and knock correction. 3rd gear pulls and same road same day. Top chart is JDL UEL. Bottom chart is stock gutted manifold. Even with it leaning out a bit (wideband log showed a max of 12.8 AFR in the 6-7k zone) and the tune not even being tweaked, there is no knock correction. Hope this sheds some light on just how bad the stock manifold is (at least for turbo applications that retain it). Last edited by sw20kosh; 05-20-2014 at 12:46 PM.