Over the years we have had quite a few header tests that gave everyone an idea on how each product performs. These two, for example, were done back in 2001 and 2003.

http://bob123e.tripod.com/thegreatheadertest/index.htm
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/titans-header-test-berts-pictorial-56k-u-wish-700477/

Recently there was another one done by a local shop here that caught my attention. It was between the Bisimoto V2 and a Hytech replica. Bisimoto claimed that (with dyno plot) the V2 netted 22whp and 11wtq over the Hytech rep. It was a very substantial gain, and the local shop ProFunction decided to verify it with their own dyno:

http://profunction.freeforums.org/th...test-t111.html

In order not to steal their effort, I provided the above link to their findings for everyone reference.

 

Bummer have to register first. Very curious though as I currently have the hytech rep

 

For those that don't want to register.

Bismoto - 189.52/133.87
Hytech Rep - 182.29/131.63

 

Sweet thanks Derek! Was this test done on a stock c5?

 

niice stuff

 

even better question is with temp. were the tests done on the same day and same dyno? were equal length cool off sessions provided between pulls? 5-7 hp could be all temp or it could be a better header

 

I find it halarious that Bisi's header barely out performed a hytech replica; a header that is 1/4 of the cost of a real bisimoto header and as racebum said, 5-7 hp could be just in temperature. Interesting stuff. I would love to see what a real toda header would do against Bisi's v2 header, considering how well it did in the last header test I remember pro-function doing. Hint Hint

 

I will link the plots in a bit.
The Bisimoto one took a huge drop in mid-range....

 

Hytech rep vs Bisimoto V2 from Bisimoto own forum:



Bisi rep (green) vs Bisi real (blue):



Hytech rep, with partially crushed secondaries (red) vs Bisi real (blue):

 

Taken from that thread:

For reference sake our test dummy is a
JDM ITR 98 Spec Engine
AEM Short Ram
Walbro 255
Tuned on eCtune(each header was tuned individually)

 

They were all done one after the other, each fully tuned and a correction factor was used to help consistency. Usually heat soak might be responsible for a 1-2 hp deviation, but not 5-7. I'm sure the Hytech (replica) header would have done better without having 2 smashed primaries.

 

This is my take on the whole thing:

I am used to criticism, protests, and even people trying to become popular at my expense; this is not new to me. After all, I have been in this scene since 1993, with many accolades under my belt.

I am very **** when it come to my testing, in controlled environments, and all variables kept at a minimum. I also test sample A, then B, then A again, then B to verify validity. I am alos not satisfied releasing a product until it provides the data that would be awesome to the masses.

This same passion is what lead me to design and build engines like my D15 that ran 10.7s all motor...and my popular F22a insight at low 9s over 151mph n/a.

With over 961 V2 B-series headers sold, and those enthusiasts excited and proud of their power gains, I am also pleased with this design. We have documented from 8 to 22whp gains with Bisimoto V2 units over the aforementioned design. I was proud to show the very best of the testing, and in the Bisimoto dyno vault..amongst those from others around the world.

The cool thing about the custom designs is that they are tailored to each application, and if for me weird reason did not perform as expected, we work with the client to make it right...unlike any company in this scene.

I hope that this post, and others like it, was not an AGENDA, as it does smell like it. From the title (discrediting my A-B-A-B crossover testing and the test performed by others) to the same familiar names that always visit Bisimoto posts to sling mud.

When people post up great power charts and videos with our V2 headers, they are ignored. When posts like this crop up, with accusations, jest and all...people go crazy.

The design is the BEST, and that is why teams worldwide win, and break records. it would be silly of me to tarnish my hard earned reputation by BS'ing with dyno numbers...dur...people would have to buy the units and test them upon purchase, right?

Thanks for the opportunity, nonetheless, for me to shed some light on this.

 

Go info Wai, to bad I recently bought my Hytech Relica. Always interesting to see these header test.

 

Please elaborate how this thread title "discredits" your test, and how relaying the content in the ITR community being an agenda.

This is the first time I see you/your company post here and I'm not sure what kind of mud slinging you're talking about. If there's any header out there that could give me 20+whp, I would dump my Toda first thing tomorrow morning. That's why the dyno test caught my attention.

 

Mikey is the most honest human being I know. I witnessed the dyno testing. It was done back to back same day. I seen it!

 

I wish they threw a TODA in there...

 

if it was and engine and intake temps were similar this is really impressive. gaining 7hp over say... a gsr manifold is one thing but a decent hytech rep versus the bismoto is amazing. it's almost to the point that i would guess the header is as near optimum for a stock R as you could get. i know neither is restrictive so it has to be an increase in scavenging

 

That mid range wouldn't make me too happy.
And I believe the point is the +22whp claim by the company. I wonder what kind of back to back to back test and controlled environment could get that kind of gain. Not "mud slinging", just trying to learn and stay on the technical side.

 

I dont see this thread as an AGENDA at all. I dont see any malice in the intial post or ProFunction's test. The guys at ProFunction are very knowledgeable and straight up.

 

There he is using his ETs to sell product again!
His customers are proud of their gains b/c 90% never see dyno results.....Their butt dyno tells them they gained mad hp y0!

 

This being the very first real 3rd party Bisi test, I'm taking it with a grain of salt. I didn't buy my Bisi V2 to gain 5whp, I bought it because Bisi's customer service is fantastic and the header is a work of art. Nothing I've ever seen compares to the build quality and ingenuity in the V2.

 

I beg to differ...



but to be fair, an SMSP work of art is not even on the same field...

 

I wouldn't be that upset. Bisi is $500+ more than your replica.

Also, what kind of performance losses can you expect with the crushed secondaries on the hytech replica? Would the plot look that much different if not crushed?

 

I see Bisi's back to his usual misguided attempts at defending himself and his product. Anyone want to explain to me how his ET's have anything to do with a header test? Its funny how he seems to take every 3rd party test as a criticism and then trys to defend his product accordingly by railing off the same list of achievements and accomplishments that we've all seen before.

So Bisi, would you like to do something other than state your accomplishments, complain about 3rd party testing, and talk about how good your customer service is? So far thats all I've seen you do; ignoring the pathetic attempt at a straight forward dyno comparison you did way back when. I'm sure the header must have done something right?

Let me make it clear that I am not hating on Bisi. I would just like to see him do something other than the things listed above for once.

to Pro-function for the header test

 

You're also talking about a stock Honda motor. Put those two headers on a motor that makes power. You'll see a difference. The Hytech piece is a nice unit, ground clearance sucks ***** but it is a nice header.

I personally have a old Six-Sigma header on my current NA setup. I had a JDM ITR header on it, no cat going back to a 3inch exhaust. Motor made 212 and I forget torque. Thats impressive for a stock Honda header. I put my DTR/Six-Sigma on it and retuned it and ended with mid 230s with 150 torque.

As far as this test goes, it's just a test. Those torque numbers are high as **** for being a stock ITR motor.
Mine, which didnt have power steering on it. Had a Hondata gasket. Hytech Rep. 3inch intake tube. No cat. made 184whp 125tq on several dynojets local.

Bisi's headers are nice pieces. I've seen several nice K and B motors with his headers locally in cars that put down good power.

If you're on a extreme budget, the Hytech has the best bang for buck.