motohegg

Thanks for the correction.

JinkoMK

Anything new to report? I have RE-A headers coming in the next couple weeks. Contemplating on whether to hack it up.

ninetysixyenko

I would think that if you put a Choke in the collector (reverse megaphone) instead of weldeding in a straight size pipe, and added a few steps to the 2 main primaries (larger port runners) there would be even more gains from Scavenging. Especially on a motor with overlap from a bridgeport. Even if you don't succesfully get a Scavenging affect, the exhaust flow would be much less turbulent.

TeamRX8

iTrader: (25)

That would be awesome except that you overlooked several small details.

The Renesis not only has zero intake/exhaust port timing overlap (as in absolutely none), but in addition it also has two large primary exhaust ports (one for each rotor) and one shared smaller flowing siamese port. Additionally, in terms of timing speed, the exhaust port opens slowly and closes slower still. During the slow closing cycle the flow is also slowly choked off due the long shallow tapering exhaust port. It is in fact one of the most unique exhaust flows scenarios ever seen on a mass produced automobile engine. In order for any scavenging to occur would require a resonant pulse so strong and so long that only the likes of God himself could produce it. Since you are trying to pull it from a closed chamber (zero overlap/crossflow) even God himself can apparently overcome that too since the universe we live in is essentially one big vacuum.

But we already had that arguement years ago, would best to take it there rather than dog out BHRs marketing thread .....

https://www.rx8club.com/series-i-aft...-theory-79388/

Or you could instead go buy a Racing Beat header, cut off the restricted outlet, sharp angle collector, and perform the mods you suggest to prove it out yourself. I'm afraid you're going to find that there's a big difference between actually finding more power than dreaming it up with misapplied theories ....

JinkoMK

Charles actually did do that at one stage. He found that going from a venturi collector to a straight collector gained 5hp, the gains of most after market headers alone.

I'm still trying to find a quality exhaust shop to get this started for me. Looking to get some before and after dynos in too. They're not unreasonably expensive for a few runs.

skc

Contact Ric Shaw in Sydney he has done a few long tube headers.

TeamRX8

iTrader: (25)

yes, just like someone has been saying for years and said so in the thread too before the testing began ..


https://www.rx8club.com/series-i-aft...8/#post1207500

https://www.rx8club.com/series-i-maj...3/#post1695859

https://www.rx8club.com/series-i-aft...8/#post4393542

https://www.rx8club.com/series-i-aft...6/#post4600144

TeamRX8

iTrader: (25)

Yeah, just backing it up or perhaps fronting it up

JinkoMK

I have seen your exhaust setup and have saved it onto my computer a while back. I actually planned on calling some shops to fabricate a header similar to yours. Looks neat.

I'll try this set up of mine first though, and see how it goes.

TeamRX8

iTrader: (25)

It served my purpose then, but I don't recommend doing it that way unless using heavier material. It has no give for uneven expansion/contraction. Eventually the stress will take its toll, but thd thicker it is the longer it will go before cracking.

Take a Racing Beat header, cut off the collector, have a 12 degree x 3" outlet merge collector installed on it instead, and you will get pretty close to even the best header power making setup possible. Other things come into it; engine condition, a larger primary pipe size, the midpipe/muffler pipe connection (it appears that the BHR midpipe still has a non-tapering reduction down to the OE donut gasket size?), the muffler system, etc., but you can still get close all else being equal ... put a slip connector on it and you can have slip pipes in various lengths to test out the affect of tube length for yourself ...

JinkoMK

I already have an RE-A header coming in from Japan. Got a response from a couple exhaust shops so I'll see where I go from here.

Looking to extend the primaries even further than BHR to see what figures it makes. Converting the rest of the exhaust to 3" as well. All with dyno runs before and after just for the sake of documenting it to everyone here. If it doesn't make anything worthy, well, **** go.

TeamRX8

iTrader: (25)

welcome to 9 years ago, good luck with that

https://www.rx8club.com/series-i-aft...2/#post1210351

BigCajun

iTrader: (1)

Why are y'all talking about applications other than what this thread is supposed to be about?

It's "BHR LongTube Header Install and Review."

Start a different thread and leave this for it's stated purpose, please.

TeamRX8

iTrader: (25)

^^welcome to RX8Club, good luck with that ... vv

BigCajun

iTrader: (1)

I don't care what happened in the past, personal biases aside, I am interested in this particular thread now.

TeamRX8

iTrader: (25)

a. You don't seem to understand that we're in agreement.
b. There is no personal bias, just experience. Who is promoting it is irrelevant.
c. If you don't want tangents then maybe try not to introduce any more ...

Carbon8

iTrader: (4)

Just finished compiling everything from today's session. Firstly some impressions and recap.

I have driven about 200 miles this week with the header install, with not adverse signs. AFR, LTFT, STFT, and everything else is dead on as well my heat shielding is holding up great and the notch for the downstream censor is working perfectly. As far as audio, this exhaust is much quieter than my previous straight pipe system (as expected) no drone, less rasp and all around sounds like a more mature system and have gotten many compliments on it.

As per the power output, a little back story. I am no longer doing my dyno's in 5th as the gear is to tall and deemed both to stressful on the motor and unsafe speeds on a dyno. So I have 4th gear Dyno's to compare. Now my car stock back in 2012 put down 214WHP and 141WTQ in 4th, last year after my rebuild and extensive NA build it managed 221WHP and 148WTQ (this is the Dyno I compare to) not only did my build yield some top end gains but was more impressive was the mid-range yield of about 8% from 3500 and up.

The below dyno is on a Mustang Dyno which made 223WHP and 154WTQ on the top end, and also yielded an additional 5% from 3800 and up. So on a heavily modified NA engine this product still manages to extract a noticeable increase in untapped potential.

My log graph, the AFR dips a little lower than my target (12.2) but nothing to drastic I may jump this up a bit at a later date but this was taken on the same tune I established last year. MAF readings in excess of 260G/sec

Here is the video as well.

BlackStealth

iTrader: (3)

Can you list your mods for the baseline dyno @ 221whp to the changes of your gain of 2whp with the long tubes?


btw - 2hp is basically within margin of error depending on temperatures etc etc. so the gains (and expense for the sytem) don't seem all that impressive as some have been circle jerking to...

RIWWP

iTrader: (2)

^ Fortunately there isn't a single other data point on his chart, and he spends 100% of his driving time at peak power, so the "2hp" gain is really really terrible...

BlackStealth

iTrader: (3)

Again, it's within margin of error. So if it was a few degree's colder that day than the baseline, then the 2hp gain across the powerband isn't relevant towards a true gain. Furthermore, all that added weight probably negates the 2hp gain... or perhaps it doesn't with his wallet compensating for the weight loss?

edit: Just noticed you went from OBX header and midpipe to the longtubes. So to those who said they expected 10+ horsepower OMGz take my money now plz!! ....lol

RIWWP

iTrader: (2)

2? Take a look at ~6,500rpm. He is up ~15whp. The lines on the graph show clear and obvious gain across the board until the very tip of the power, where they finally converge for that "2hp".

It's very much not just "within the margin of error"

Arca_ex

iTrader: (10)

Pretty much what I expected of actual third party test results.

TeamRX8

iTrader: (25)

Not to take anything away from the OP because it's good, solid result that is not seem often *on this forum*, but in reality it's not much better than what a factory built non-ported engine with a free-flowing short tube exhaust manifold has recorded in the same gear on a Mustang dyno.

TeamRX8

iTrader: (25)

Wow, not sure where that came from or even why you felt his innoculus reply deserved that kind of response

Carbon8

iTrader: (4)

I have been trying to refrain from adding only the data to this thread but want to point out the following as I do not understand why the attitude here is so negative for what I believe to be an excellent product.

My NA build before this header was in excess of $12,000 and netted impressive gains for an NA motor with 8WHP and 8WTQ, but also added 5% throughout the power band.

The addition to this header (with no other changes) on top of the above gains yielded an additional 2WHP and another 8WTQ as well as another 4% throughout the powerband for a fraction of the cost as above.

So in total I have increased WHP by almost 10%, and WTQ by 6% in the entire usable range, aslo as note I have not seen many if any non race engine put down these numbers on a mustang dyno.

So in recap, 12K for extensive build to get 5% increase, or the addition of this header and an out of the box 4% increase (from my testing data).