JDL 4-2-1 EL header

[JBezugs]

Gonna bump this up to the top as I see many more people are running this header out in the wild! How are y'all enjoying it? I was planning a local dyno day earlier this year to compare the gains vs a stock vehicle on the same dyno/same day to have more data for everyone, but due to COVID that obviously couldn't happen.

I still wholeheartedly recommend this header if you're looking for an EL option. My car is still sounding and driving awesome.

Hope everyone is staying safe!

[TMF]

I don't recall if I posted my dyno numbers after I went to E85, but here are my numbers.

You'll probably say, "these look low!" and "there's no comparison!", which are both accurate statements. But the one constant here is that these dyno runs were conducted in compliance with NASA's dyno testing procedures, which usually read low.



Also, the only sounds you need are at full throttle

[solidONE]

Originally Posted by TMF

I don't recall if I posted my dyno numbers after I went to E85, but here are my numbers.

You'll probably say, "these look low!" and "there's no comparison!", which are both accurate statements. But the one constant here is that these dyno runs were conducted in compliance with NASA's dyno testing procedures, which usually read low.

That G-spot at 4555rpms

[JBezugs]

Originally Posted by solidONE

That G-spot at 4555rpms

I also have the same G spot on my dyno run

That’s where vtak kicks in.

[solidONE]

Originally Posted by JBezugs

I also have the same G spot on my dyno run

That’s where vtak kicks in.

I got a G-Mound, you know what they say about torque curves.. its like shoes size. "motion of the ocean" and things like that. Know what I mean? *wink*

"looking at the torque cure, you packin some long tubes" know what I'm sayn'?


Edit: *crickets*

[jflogerzi]

Just do it. Beside the ace350's these are fantastic headers. Love them with my boosted twin. And they are cheaper to boot than the ace headers

Sent from my GM1915 using Tapatalk

[Code Monkey]

Nevermind the numbers, with ACE headers peak hp is usually around 7,400 rpm and the tq stays flat until around 7,000 rpm (my dyno sheet). Can JDL achieve that, or are you limited by class rules and had to detune at higher rpms?

[solidONE]

Originally Posted by Code Monkey

Nevermind the numbers, with ACE headers peak hp is usually around 7,400 rpm and the tq stays flat until around 7,000 rpm (my dyno sheet). Can JDL achieve that, or are you limited by class rules and had to detune at higher rpms?

I think after 6.5k the cat back plays in a bit more. Can it maintain the torque a at higher RPM with an open exhaust? I would think the 949 guys would know, but I dont think they dyno or tuned to "max out" the output on a dyno graph. Same G-spot peak. Cam timing similar?

[Code Monkey]

@TMF, are you still on this exhaust? My tune is a road racing tune as well.

[jflogerzi]

Here is my Dyno pull with Zach at csg

https://www.instagram.com/p/B8sJ1XDn...d=ty42p88y5tfo

https://www.instagram.com/p/B8sOU-0n...d=klqnb0pf9upg

Sprintex 210 +69mm pulley IC, flex fuel
JDL 4-2-1, stock op/fp with extra ultra vibrant resonator and mxp sp exhaust

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[Celica00]

Jeez @TMF when you went into that turn going 125MPH, I just about had a heart attack vicariously. What brakes are you using?

[solidONE]

Originally Posted by Code Monkey

@TMF, are you still on this exhaust? My tune is a road racing tune as well.

IT is odd that the torqu tapers off sharply on that dyno. Maybe timing is being pulled at 6400rpms.

[JBezugs]

Originally Posted by solidONE

IT is odd that the torqu tapers off sharply on that dyno. Maybe timing is being pulled at 6400rpms.

It’s certainly possible. For reference; here’s my dyno from earlier in the thread. Unfortunately this was only a 7100rpm run but the torque holds on pretty well, with a slight taper past 6750 but not as steep of a fall-off.



OnPoint Dyno’s Dynapack reads very similarly to the CSG Dynapack (that is to say, low) based on the numbers I’ve seen from both.

[TMF]

Originally Posted by Code Monkey

@TMF, are you still on this exhaust? My tune is a road racing tune as well.

Originally Posted by solidONE

IT is odd that the torqu tapers off sharply on that dyno. Maybe timing is being pulled at 6400rpms.

Now ya'll have me concerned, I don't know why I didn't see the torque completely falling off on the graph. That was a 5th gear pull, not sure that should make a difference though, although it is a lot of strain on the engine.

And yes, I'm still on the same exhaust setup (JDL 4-2-1 EL header, JDL overpipe, JDL catless frontpipe w/ single resonator, Tanabe Concept G catback).

Might need to follow up with my tuner on that.

Originally Posted by Celica00

Jeez @TMF when you went into that turn going 125MPH, I just about had a heart attack vicariously. What brakes are you using?

Haha yea, that turn is a hair raiser.

OEM brakes, Carbotech XP12 pads in the front, XP8 in the rear. I don't see a reason to upgrade brakes on this car other than reducing consumables. I am on Hoosier R7's as well, so that helps too