Your shop floor could use some new epoxy coating.

 

It was thought of for you by someone else earlier in the thread and you participated before and after that particular post ...

 

Please tell me that you didn't reuse the original merge and OE type flange at the end?

 

Yes, I did. It does taper down a bit but does not seem all that restrictive. I talked with racing beat a while ago and they confirmed that they had messed around with lengthening their header (using the same flange) and had noticed some power gains. Would having my own larger custom made collector help? Probably... but this was easy and cheap. We'll see how it does.

 

Don't I know it. Actually the floor is painted with the same paint used to paint the floors of airplane hangars. Has held up pretty well so far. Getting the floor smooth with an epoxy coating would have cost big bucks. The place was a big rig repair shop for many years previous to me occupying it and lots of heavy stuff was dropped on the floor. But it's a cheap location to store my race cars!

 

You want the lowest possible angle transition and then no point should be less than 2.75" at or past the merge (typically 3" is used)

However, as stated from the beginning I will challenge any multi-tube header as being irrelevant as to what actually provides the widest and highest output curve on a zero overlap Renesis engine

 

Ok... there is DEFINATELY power to be had by lengthening the header. The lengthening of my header was the only modification I made to the car before the race at AAA Speedway this weeked and the car was definately stronger particularly on the top end and speeds were definately up. AAA Speedway is a high speed track that rewards power a lot. I set a class record and broke my previous best time by over 2 seconds. Of course many other factors could have contributed to this increase in speed but the car was undoubtably running at a higher speed at the end of the straights than it did at previous races with the unmodified racing beat header.

If you're in a class that allows this modification DO IT.

 

Well that's all I need to hear! Time to drop the cash on a header and call the fabricator.

 

:facepalm:

 

You know what? If you never experiment with the car it'll never get faster either. I would dare to say that the vast majority of any type of mod, custom or not, has probably been done before so everyone is most likely copying somebody if you want to be a jackass about it.

I'm sure you've tried at least a handful of experiments with your car that yielded less than satisfactory results.

 

And here I've been trying to take sh*t out of the car. I'm always doing it wrong....

 

It all depends on who you wish to listen to.

 

Originally Posted by TeamRX8
as racing fabricator great Smokey Yunick used to say, "racing is a monkey see, monkey do business; if the winner has a 5 lb bucket of sh*t located over the right rear wheel and wins you can expect all the other monkeys to have the same thing at the next race regardless of whether or not they understand what they're doing"

Smokey was a clever guy. But he was also a nut and a lot of people disliked him.

 

And UMS for a before/after dyno.

 

somewhere in the forum Team has a picture of his modified log type exhaust manifold. I am assuming he is still using it. I do believe it is not as simple as it looks.

 

zero overlap = closed chamber

do you recognize the energy required to pull a vacuum? Because that's exactly what has to occur in order to scavenge a zero overlap combustion chamber ...

 

pics? Lol Team is the only reason I haven't ordered a tubular header for my NA engine.

 

I only build one for less weight. You can make one flow better than the OE version, but I disagree that there is any benefit beyond those two reasons and you don't need a tubular to get there. Three tubes will have more surface area/weight than one all else being equal.

The main issue is that all the standard stuff revolves around fitting up with the OE components. IMO a 3" midpipe that then necks down at the flanges is like shooting yourself in the foot. That's the way most of them are built.

There are many reasons why you may have run faster. Just getting through the corner faster will result in higher engine/chassis speeds at the next corner. Basically your butt dyno means nothing in this instance. Unless you have before/after time vs velocity (acceleration) or dyno data to back it up you have no real idea where it came from. You added length to an RB header, which is exactly what they tested too. Maybe you found something they didn't, but then you already know my opinion.


.

 

Forgive my ignorance since I haven't actually ever removed my oem manifold, but is there any room for improvement on smoothing out the flange ports?

 

many of the parts on my car are custom with multiple iterations including the *entire* exhaust system, you are preaching to the choir

but since you brought it up, did you ever consider asking some questions or trying to evaluate the situation with a critical eye about what the real facts may be rather than having a knee jerk reaction to some unproven butt dyno commentary? Maybe you missed the 5 year old understanding the RB tried different lengths and came up with nothing substantial? How is it that adding some pipe on their manifold suddenly transformed this car into a rocket ship?

My opinion on the subject is all over this website. Why do you care what I think any way? I'm just another crazy nut that a lot of people dislike. LOL.

 

those shoes are too big to be filled even by me

 

I was at the Racing Beat facility last year and spoke in person with some of their employees. They told me that they did experiment again with a longer tube header design recently and that they did find a little bit more power. Tested on their engine dyno which is pretty accurate. In fact they said they were considering making a long tube header themselves but weren't sure there would be much demand. My understanding in talking with them was that they made it the length it is not because it's the optimal length but because they wanted it to easily attach to the factory midpipe/cat.

Were you informed of something different regarding testing by Racing Beat?

Also, Eric Meyer who raced in World Challenge claims to have done extensive dyno testing and found that a custom long tube header had a power increase over the shorter headers.

In regards to my butt dyno you're entirely right that such an instrument can be highly inaccurate

However, the track I was at I had raced at MANY times and the entry speed onto the main straight is very consistant. The car's speed was definately up and my shift points were sooner as I traveled down the straight (it's a long one followed by a high speed banked turn so you tach out in 5th by the end). As I said many other factors COULD have caused this - but it seemed pretty obvious to me that the car had improved power.

 

I prefer to look at the exhaust as a whole- here are pics of our "single" exhaust-












I will post pics of our "dual" exhaust when I have it out.

 

Nice! Thanks for the pics. Boy... that really expands after the collector. How wide does it get? 3" or more?

 

I am interested. Maybe a developer will design and have one fabracated for general sale?