JDL 4-2-1 EL header

[MilkyWitness]

Originally Posted by Turdinator

I installed my 4-2-1 about a week ago. They went it very smoothly. There was no interference anywhere. In fact the 4-2-1 fit better than the JDL UEL header they replaced. Power wise they have a smoother torque cure than the UEL but I shouldn't really comment as I am just on the Delicious base map. Once the tune is finalised I'll have some better driving feel comparisons.

Hey, I just installed the JDL 4-2-1 a week ago too and just have the Delicious base tune as well, waiting for revisions.

Everything fits really well, and there are no issues with fitment on the skid pan.

In case anyone is curious, I had these headers and the Nameless axleback muffled 5" track pipe (single exit), and it sounded pretty terrible. It was raspy and had a lot of drone. I previously used Tomei UEL headers with that same axleback and it had zero rasp. I ended up swapping back to stock muffler today. It has a but of a perhaps tinny or raspy sound, not that bad, but I guess that is what happens when you go catless. Does anyone know of a good exhaust that wont have any rasp and minimal drone to pair with these?

[Turdinator]

Originally Posted by MilkyWitness

Hey, I just installed the JDL 4-2-1 a week ago too and just have the Delicious base tune as well, waiting for revisions.

Everything fits really well, and there are no issues with fitment on the skid pan.

In case anyone is curious, I had these headers and the Nameless axleback muffled 5" track pipe (single exit), and it sounded pretty terrible. It was raspy and had a lot of drone. I previously used Tomei UEL headers with that same axleback and it had zero rasp. I ended up swapping back to stock muffler today.

When I installed mine I also put a JDL ultra quiet catted front pipe and the Perrin 2.5" resonated cat back. No Rasp, sounds great and is surprising quiet when cruising @ 100km/h (~60mph)

[R_E_L]

Finished tuning with Bill today so I finally got to fill up with some e85. My budget didn't allow for dyno time so I'm sorry I can't provide any pretty graphs.

My quick first impressions from are that power builds smoothly with a nice little surge around 5k, holding past 7k. I have little experience with other cars so take that for what it's worth. I'll try and provide better feedback once I visit the canyons this weekend. One thing I can definitely say is that I'll need better rubber to scrub off the newly added speed.

[MilkyWitness]

Originally Posted by R_E_L

Finished tuning with Bill today so I finally got to fill up with some e85. My budget didn't allow for dyno time so I'm sorry I can't provide any pretty graphs.

My quick first impressions from are that power builds smoothly with a nice little surge around 5k, holding past 7k. I have little experience with other cars so take that for what it's worth. I'll try and provide better feedback once I visit the canyons this weekend. One thing I can definitely say is that I'll need better rubber to scrub off the newly added speed.

I noticed the surge at 5k too, maybe ya me or my tune but I feel like there is less power than UEL headers in the torque dip range.

[wparsons]

Originally Posted by MilkyWitness

I noticed the surge at 5k too, maybe ya me or my tune but I feel like there is less power than UEL headers in the torque dip range.

Probably either your tune, or in your head by how it's delivering power. This is JDL's own testing of their 4-2-1 EL vs their UEL

[Turdinator]

Originally Posted by MilkyWitness

I noticed the surge at 5k too, maybe ya me or my tune but I feel like there is less power than UEL headers in the torque dip range.

I feel like the power delivery is much smoother than the UEL. It doesn't feel as fast by seat of the pants but I also feel like I rip through the gears faster so it probably is. Below 2.5k rpm i feel like its more doughy than the UEL however.

[MilkyWitness]

Originally Posted by Turdinator

I feel like the power delivery is much smoother than the UEL. It doesn't feel as fast by seat of the pants but I also feel like I rip through the gears faster so it probably is. Below 2.5k rpm i feel like its more doughy than the UEL however.

How many revisions have you had from delicious tuning so far on your header? Im still on their base tune waiting to hear back.

[TMF]

Originally Posted by MilkyWitness

How many revisions have you had from delicious tuning so far on your header? Im still on their base tune waiting to hear back.

I did about 6 revisions, but the last 2 were right after they launched an updated 4-2-1 version. They've tuned a few now, so I'd guess that you'll have less revisions before it is spot on.

[Turdinator]

Originally Posted by MilkyWitness

How many revisions have you had from delicious tuning so far on your header? Im still on their base tune waiting to hear back.

Still on base tune. It took me a little while to find somewhere I was comfortable doing the 3rd gear pull log. Hoping for a revision this week. Fuel trims aren’t too bad and there has only been one time my Iam dropped below 1 so it’s a reasonable base tune.

[R_E_L]

Originally Posted by wparsons

Probably either your tune, or in your head by how it's delivering power. This is JDL's own testing of their 4-2-1 EL vs their UEL

I would say that for me at least, what I feel actually matches that graph. The swell from 3500-4000 in the torque graph is the first push you feel from the car when getting on the power, and then a little before 5000 there is another little surge with power holding to redline.

[Turdinator]

Turns out I was on the Delicious Stage 2 not the JDL tune. I'll flash tonight and see if it feels much different.

[MilkyWitness]

Originally Posted by Turdinator

Turns out I was on the Delicious Stage 2 not the JDL tune. I'll flash tonight and see if it feels much different.

Oh you were on the Delicious Stage 2 base tune, and not their Stage 2 base tune specifically for the JDL header? Let me know what you think.

[coolguy1o1]

Originally Posted by MilkyWitness

Oh you were on the Delicious Stage 2 base tune, and not their Stage 2 base tune specifically for the JDL header? Let me know what you think.

Check ur PM


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[Turdinator]

Originally Posted by MilkyWitness

Oh you were on the Delicious Stage 2 base tune, and not their Stage 2 base tune specifically for the JDL header? Let me know what you think.

Initial impressions are its a step above the stg 2 I had. Throttle response under 3k rpm is much improved. Power delivery is smooth. Will give further impressions once the tune has settled in and learnt what it needs to learn after a flash.