JDL 4-2-1 EL header

[Roadcone]

Originally Posted by Captain Snooze

I could be wrong but I doubt @Turdinator would be willing to ship his car to the U.S. to get a tune.


Sent from my PC.

That's why you do what I did an use email.

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[Turdinator]

Originally Posted by Captain Snooze

I could be wrong but I doubt @Turdinator would be willing to ship his car to the U.S. to get a tune.


Sent from my PC.

I wasn’t quite looking to spend that much. Unless anyone wants to sponsor me? I could have the car measured for any RHD clearances that any manufacturers wanted?

Mostly I want an idea of what tuners have already developed cam tables for the header.

[Roadcone]

HRi is the only one i'm aware of and he specifically said that most tuners are going to have a serious issue figuring it out. I looked at my final tune and there are some obscure cam timing events that go against general logic but i could tell a seat of the pants difference between the changes that caused them.

[smg1138]

Originally Posted by Roadcone

You're going to need a real custom tune. The cam tables are WAY different from the El and uel tunes for everything else.

Would the OFT Stage 2+ work temporarily until I could get a custom tune done? I know it's not optimal for performance, but would it be safe just to daily drive a little while?

[tomm.brz]

Originally Posted by Roadcone

HRi is the only one i'm aware of and he specifically said that most tuners are going to have a serious issue figuring it out. I looked at my final tune and there are some obscure cam timing events that go against general logic but i could tell a seat of the pants difference between the changes that caused them.

post a log maybe for the benefit of everyone?

[Roadcone]

Originally Posted by tomm.brz

post a log maybe for the benefit of everyone?

As a self tuner... Nope. I'm not gonna spread the magic numbers

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[Roadcone]

Originally Posted by smg1138

Would the OFT Stage 2+ work temporarily until I could get a custom tune done? I know it's not optimal for performance, but would it be safe just to daily drive a little while?

I ran stock tune for a few hundred miles and it ran fine. Sounded pretty epic honestly.

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[RayRay88]

Originally Posted by smg1138

Would the OFT Stage 2+ work temporarily until I could get a custom tune done? I know it's not optimal for performance, but would it be safe just to daily drive a little while?

You could run tuneless for awhile without any real repercussions, except for maybe a CEL.

You just won't be getting the full benefit of the header.

[CSG Mike]

Originally Posted by jflogerzi

That's correct. There are several tuners that can help with this on the forum. They will use the ace numbers and tweak from there.

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That wouldn't be a great base, considering how different the runners and runner lengths are.

[Turdinator]

Has anyone used Delicious for a tune yet? I sent them an email about it and they said they had tuned many 86's with these headers but it felt like a bit of a generic response.

[MilkyWitness]

Originally Posted by Turdinator

Has anyone used Delicious for a tune yet? I sent them an email about it and they said they had tuned many 86's with these headers but it felt like a bit of a generic response.

I will soon. I put my order in for these Monday so it'll be a few weeks before I get them. I am tuned by Delicious for my Tomei UEL's and I'll be using them for my re-tune once I get the JDL's swapped in.

[TMF]

Originally Posted by Turdinator

Has anyone used Delicious for a tune yet? I sent them an email about it and they said they had tuned many 86's with these headers but it felt like a bit of a generic response.

Yes, I have been working with Bill Knose at Delicious Tuning on my JDL 4-2-1 header. I think they have tuned other JDL 4-2-1's, and plenty of ACE 350's (very similar to the JDL 4-2-1). My last revision has been pretty great...lots of midrange and the auto blip downshift is also improved. Driveability/smoothness has also been improved IMO.

Delicious Tuning is definitely one of the best out there for this platform, but I will note that the revisions have been a little slow over the last month or so. They seem to be pretty swamped, especially since their recent updates to their tunes, see post# 1193: https://www.ft86club.com/forums/show...=52200&page=86

I think they've caught up a bit though. I would still recommend them.

[JBezugs]

Anyone else get their header installed and tuned/dyno’d yet? Curious to see results, particularly how it compares to the ACE A350 on the same dyno and if there’s anyone FI who jumped over.

I’ve had my header on the car for a few months now, absolutely loving the extra power and the sound. The drivability improvement without having torque dip there is incredible, how the car should feel from the factory IMO.

[CSG Mike]

Originally Posted by JBezugs

Anyone else get their header installed and tuned/dyno’d yet? Curious to see results, particularly how it compares to the ACE A350 on the same dyno and if there’s anyone FI who jumped over.

I’ve had my header on the car for a few months now, absolutely loving the extra power and the sound. The drivability improvement without having torque dip there is incredible, how the car should feel from the factory IMO.

Ace A350 header vs JDL 4-2-1. Green = stock, Orange = Ace A350, Blue = JDL 4-2-1. All dynos on ACN91.



The "dip" on the Ace header in this graph is an anomaly. Here's a full set of Ace dynos to verify.



Long story short, the JDL makes the same peak area under the curve from 6500-7400, which is important if you're shifting at redline and want maximum acceleration.

The A350 has a vastly larger midrange powerband.

Both headers are engine limited up top, rather than flow limited.

For FI results with a supercharger, see this thread, that compares a Ace A350 vs Gruppe-S header, both on a JRSC + HBP + Ethanol. The Gruppe-S header is on a straight E85 tune, whereas the Ace A350 is on a Flex tune with E70. Straight E85 tunes will always make more power than a Flex tune. http://www.ft86club.com/forums/showp...postcount=5027