Tri Y headers..

[BlitZ]

Can anybody shed any light on the whether there are advantages/disadvantages on merging 1-3 and 2-4 primaries vs merging 1-2 and 3-4? I.e. SMSP vs Hytech replica in the pic?

the whole pt of the thread. Dyno graphs would also be great

[tinkerbell]

i'll be installing the Hytech replica one in the next month, then doing back to back dyno with JDM 4-1's

fatboyz - can you weld?

[fatboyz39]

i'll be installing the Hytech replica one in the next month, then doing back to back dyno with JDM 4-1's

fatboyz - can you weld?

Can weld, but not good at it. Just run both open headers back 2 back.

[tinkerbell]

NCD - the 4-1's have the cat welded on

[Benson]

OPen headers test FTW!

[beeza]

WOW! They All look Great,especially the TODA Header! No wonder I keep hearing that name.

btw I'd LOVE to see a d-series thread like this

[zco]

hytech replica headers

i picked mine up for 600, but i think its abit cheaper now.. pm me if u want more information

[TODA AU]

NCD - the 4-1's have the cat welded on

Have you got the original flange from the 4-1's?
If so, I have an adjustable test pipe you can use to swap between the 2.
If not, find one & get it attached...
Then the swap is easy.

[TODA AU]

Can anybody shed any light on the whether there are advantages/disadvantages on merging 1-3 and 2-4 primaries vs merging 1-2 and 3-4? I.e. SMSP vs Hytech replica in the pic?

Theoretically there should be no difference as the exhaust pulses in both cases are still 90deg apart. 1-3 & 2-4 or 1-2 & 3-4
The Hytech seem to work better IMO as they have double stepped primaries.
The 1-2 + 3-4 headers I’ve seen only seem to have single stepped primaries.
IMO the Hytech header looks better too…

For those who are interested, the TODA headers are a conventional interference header design with exhaust pulses 180deg of crankshaft rotation apart. 1-4 2-3
There is no stepped primary as flow reversion is not an issue.
The stepped primaries found in most of the unconventional interference header is to stop just this, due to both ports exhausting at the same time,
Also a reason for the additional length in the primaries.

On paper, the unconventional interference header behaves more as an inertia tuned header & the conventional interference as a shockwave tuned header.
Both arrive at similar ends in power & torque through the rev range.
That said, I agree dyno figures on the same car on the same day will tell the truth.

If someone wants to donate a car & the appropriate headers can be collected, I'm happy to offer the dyno for a header comparison.
Maybe do it on a Sunday so all the headers can be tested back to back on the same day.
Could be the OZHonda header test...
We'd just need a car that was 1/2 decent, with a good cat back & an owner willing to have it used as a mule.
Use the adjustable test pipe to get the fitment to the cat back right & just run them all without a cat.
In any case, I think this would settle the debate... (For the capacity of the test car)
Maybe doing 2 or 3 cars of different capacity would be the go.
Though I have confidence in our own product, in the interest of keeping the test on a level playing field, I’d say having a few adjudicator types present (Benjamin – Fatboys39 – Benson etc) would have everyone assured the test was above board with no fudged figures.
Maybe break out the BBQ too eh?
Let me know what you think...

[taman]

i have the 4-2-1 hytech replica in my car atm,

upgraded from the xforce 4-1 header

i must say for daily driving, its a mucher better piece then the 4-1.
up top and flatstick, gains are still to be had but as much as part throttle and down low.
response and has also improved dramatically especially down low along with the torque gains.

all in all i think it was a VERY good upgrade over the 4-1.
had the xforce 4-1 and the jdm ITR 4-1 installed on my car, didnt notice any diffrence between them. but boy do these extractors make driving a torquless POS a dream. aircon on with full load, i still feel theres enough torque for daily commuting unlike before with the 4-1, the car would struggle and id have to rev its **** off to get anywhere.

with the xforce header i made 104atws, everything else is bogstock,
will be going on the same dyno again tomoro, and hopefully have dyno charts up.

[fatboyz39]

Could be the OZHonda header test...
We'd just need a car that was 1/2 decent, with a good cat back & an owner willing to have it used as a mule.
Use the adjustable test pipe to get the fitment to the cat back right & just run them all without a cat.
In any case, I think this would settle the debate... (For the capacity of the test car)
Maybe doing 2 or 3 cars of different capacity would be the go.
Though I have confidence in our own product, in the interest of keeping the test on a level playing field, I’d say having a few adjudicator types present (Benjamin – Fatboys39 – Benson etc) would have everyone assured the test was above board with no fudged figures.
Maybe break out the BBQ too eh?
Let me know what you think...

Im down for this test. It'll volunteer a b16 1.6L, has 4-1 megan headers on there now.

[bennjamin]

i think tie it in with a TODA dyno day. And have this "header test" as a side test for people to spectate