Tri-Y (4-2-1) stepped vs. UEL 4-1

[solidONE]

Originally Posted by Dephective

Also, like Nameless is finding out, to get the optimal length for their runners, they need more room than our bay currently allows. This is why they are taking so long. Well, that and poor time management lol.

Actually, their initial prototype was very impressive with the TQ peaking where the dip used to be. Even with a cat mated to it, it was much more impressive than the HKS offering. http://www.ft86club.com/forums/showp...59&postcount=3

[Dimman]

Originally Posted by solidONE

Actually, their initial prototype was very impressive with the TQ peaking where the dip used to be. Even with a cat mated to it, it was much more impressive than the HKS offering. http://www.ft86club.com/forums/showp...59&postcount=3

The first dyno in that link is their 4th? revision with the space (fan shroud?) issue.

[solidONE]

Originally Posted by Dimman

The first dyno in that link is their 4th? revision with the space (fan shroud?) issue.

Is that right? Still very impressive especially considering this was achieved without a tune, since they tested this before there were any tuning solutions for the ECU available. I can only imagine what it would have looked like with a proper tune on E85 fuel.

I've been considering fabbing my own header since I do have some 1 5/8" and 1 3/4" SS tubing in the form of aftermarket honda headers laying around. I saved them instead of selling them just for an occasion like this.

I've never worked on a boxer engine before this car save for some work done on some WRX bolt-on stuff. Hoping to learn what works on these things before I even consider busting out my chop saw and welder.

[Dimman]

Originally Posted by solidONE

Is that right? Still very impressive especially considering this was achieved without a tune, since they tested this before there were any tuning solutions for the ECU available. I can only imagine what it would have looked like with a proper tune on E85 fuel.

I've been considering fabbing my own header since I do have some 1 5/8" and 1 3/4" SS tubing in the form of aftermarket honda headers laying around. I saved them instead of selling them just for an occasion like this.

I've never worked on a boxer engine before this car save for some work done on some WRX bolt-on stuff. Hoping to learn what works on these things before I even consider busting out my chop saw and welder.

Tuned as well.

[solidONE]

Originally Posted by Dimman

Tuned as well.

The ECU? With what?

[Dimman]

Originally Posted by solidONE

The ECU? With what?

Ecutek, I think? English Racing was working on sorting out the small left-over dip, plus it seemed to be changing a bit on them, maybe the IAM. It's somewhere in the Nameless thread. I'll link if I can find it.

Edit @solidONE

Starting ~post #1211

http://www.ft86club.com/forums/showp...postcount=1211

This is the guy tuning it.


http://www.ft86club.com/forums/showt...on+dip&page=31

[Dephective]

Originally Posted by boxer 2.5

Id like to know where you got the info that "almost all OEM headers are UEL" It's design is inefficient both performance and economy-wise. Why would a manufacturer decide to design it as such?

OEMs cut corners. It's far cheaper to produce a "good enough" manifold than going through extreme r&d.

Do not assume because they are a reputable company that they would put the best possible part to accomplish a task that a mediocre part can do to their satisfaction.

[Circuit Motorsports]

Everything being the same (runners, length, diameter, etc.) an Equal length header will always make more power than an un-equal.

The UEL is just something of a gimmick for sound and uniqueness on these platforms.

[boxer 2.5]

Originally Posted by Circuit Motorsports

Everything being the same (runners, length, diameter, etc.) an Equal length header will always make more power than an un-equal.

The UEL is just something of a gimmick for sound and uniqueness on these platforms.

Thank you.

[solidONE]

Originally Posted by Circuit Motorsports

Everything being the same (runners, length, diameter, etc.) an Equal length header will always make more power than an un-equal.

The UEL is just something of a gimmick for sound and uniqueness on these platforms.

What are your thoughts on 4-1 vs 4-2-1?

[Circuit Motorsports]

Originally Posted by solidONE

What are your thoughts on 4-1 vs 4-2-1?

Every platform is different, so I can't say what is ideal for the Fa20 right now. Right now, it looks like longer runners are doing better than the shorter runners, whether it be 4-1 vs 4-2-1. The issue is space and packaging.

I wish I had access to the facilities and resources to do a 100% full test on every conceivable design to make the best header, That would be awesome

We are looking into some possibilities on our end for something, nothing solid yet though!

As of now we are recommending the HKS headers as a really nice choice.

[ft_sjo]

Aren't the HKS headers just a blatent rip-off of the OE ones but minus the cat?

[uspspro]

Originally Posted by ft_sjo

Aren't the HKS headers just a blatent rip-off of the OE ones but minus the cat?

Sure it pairs the same cylinders and is 4-2-1, but that's about it.

The HKS is closer to true equal length, has much better merges for the pairs, smooths out the 90 degree turns at the start of the secondaries, has much longer secondaries (instead of the cat). I'm sure the primaries and secondaries are larger as well.

HKS:


OE:


Honestly, I think if you improved the lower merge, and replaced the cat with longer secondaries, the OE wouldn't be all that bad.