JDL Header & Exhaust System Development

[ft_sjo]

Originally Posted by ATL BRZ

I think ft_sjo has a Sprintex twin screw on his car paired with this header (for now), and @moto-mike may have one on their Innovate shop car as well, not sure if they got one yet. I would expect this header to add a bunch of midrange torque and a good bit of top end power with a SC application just as it does on an n/a application, just more pronounced. Assuming you've got a full headerback to supplement, IMO you shouldn't have a problem getting the 280whp with E85 that Kraftwerks have already achieved with their Rotrex kit paired with a Skunk2 header and exhaust.

What I can tell you is that with the OE exhaust manifold and the sprintex supercharger (chargecooled), the back pressure pre-cat is almost half a bar, which is unacceptable really. This is without the secondary cat, too. I would fully expect more flow by removing this restriction (I have loosely seen this, but not really a repeatable test), whatever manifold you choose.

[nelsmar]

Originally Posted by digital_assassin

Bob at Drift Office has posted results of multiple headers with the Vortech kit and the results have been unimpressive and he has questioned whether the money is worth being spent here. His dyno testing of various headers has indicated this car gets good power gains from adding a header to a NA setup but is not so dramatic with a FI setup. JDL may be different though. Hell, I may want it just for the sound

I can only find one dyno of a vortech before and after with him... HKS EL, are there others i havent seen??

[industrial]

Originally Posted by ft_sjo

What I can tell you is that with the OE exhaust manifold and the sprintex supercharger (chargecooled), the back pressure pre-cat is almost half a bar, which is unacceptable really. This is without the secondary cat, too. I would fully expect more flow by removing this restriction (I have loosely seen this, but not really a repeatable test), whatever manifold you choose.

Wow that seems excessively high. On a PD FI application I'd imagine you'd want as close to 0 exhaust restriction as possible since you don have to worry about scavenge effects. I don't really see how freeing the exhaust wouldn't help the car. Might not make more power but it would be much happier.

[akyp]

Originally Posted by uspspro

Did anyone go with their EL header? I'm curious how it will do.

+1

Anyone got the EL one?

[JDLAutoDesign]

I spoke with a customer a few days ago. He said he did 194 on 91oct with the EL. Waiting to get some dyno sheets


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[Sellout]

Originally Posted by industrial

Wow that seems excessively high. On a PD FI application I'd imagine you'd want as close to 0 exhaust restriction as possible since you don have to worry about scavenge effects. I don't really see how freeing the exhaust wouldn't help the car. Might not make more power but it would be much happier.

Scavenging is ALWAYS helpful. Under boost or not.

That said, if you remove backpressure with any supercharger, you lose boost, generally. Gotta remember that boost is simply a function of restriction (backpressure). Less backpressure results in less boost, but likely the same power, which then goes up if you bring the boost back up (duh)

[JDLAutoDesign]

The last of the group buy uncoated headers shipped today. There are a few at the coaters that will ship soon. Working on the replacements for the guys that have the rattle from the old flexs

[digital_assassin]

Originally Posted by nelsmar

I can only find one dyno of a vortech before and after with him... HKS EL, are there others i havent seen??

I could've swore I saw more results but I don't see them now. Must stop reading about this stuff under the influence. I edited my post to make an accurate statement.

[LavosTRD]

Originally Posted by JDLAutoDesign

The last of the group buy uncoated headers shipped today. There are a few at the coaters that will ship soon. Working on the replacements for the guys that have the rattle from the old flexs

I don't have a tracking number email

[JDLAutoDesign]

Email me your order # and I will see where yours is at


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[FR-S Matt]

Man, I'm dying to get my header and add that Subaru rumble to my killer exhaust. Slow drivers are going to cry when I pass them.

[JETRED]

[ame="http://youtu.be/i8sCxb5Igjs"]http://youtu.be/i8sCxb5Igjs[/ame]

[LavosTRD]

Originally Posted by JDLAutoDesign

Email me your order # and I will see where yours is at


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Invoice # 0210

[nelsmar]

Dayyyuummmm we made some serious gains in third party testing tonight!! We just finished up and I am headed home now. I plotted a few dynos and asked my friend to send me them in a few. Get the edge of your seat ready. The only change was header + revised tune (car was previously street tuned)