I know I can purchase a short header from Racing Beat and some other sources.

However, the real ticket with racing is a long tube header. I know some of the teams run them. Are all of you just getting them custom made on an individual basis? I have a Racing Beat Header I could have "extended" but if there is an easy source to purchase a long tube header from I'd prefer to do that.

Let me know!

- John

 

There is nothing publicly available at the moment. You may be able to get a custom one from one of the race teams. But, it will be costly. BHR is apparently developing one that will be for sale. Time frame for when it eventually be on sale is unknown.

 

And you determined this relative to a zero-overlap timing Renesis engine how?

 

Dyno testing by various sources (including some experimentation by Racing Beat on their very accurate engine dyno) has shown that a longer tube header provides a performance advantage over a shorter header or stock manifold even on a stock Renesis.

Due to the exhaust port design on the Renesis you are correct that there is not as much to be gained on this motor with a header as compared to the older rotary motors but there is still power to be gained.

 

You have my address

 

Pick me!

All I have done to my exhaust is a catless midpipe.

 

I believe it was in 2005 that we were first discussing a long tube header for the RX8. I had one on my RX7. I may not be the first to order one. But, it will be on my future mods list.

 

2003 actually

 

How far are you from Chicago, I have a nice stock '06 that will fit perfectly

 

Your only about 3 mi away from me. BHR is in Phoenix (1700 mi give or take a few).

 

Sweeeeet!


Just shot you an email.

 

Baby G is crying!

 

My friend in this area had a custom header back system made. He provided all the measurements of the header design, collector length, and they fabricated it to his specification. I am sure any good local exhaust shop could do one for you if you did a little bit of research for the sizing, that is, if you don't want to purchase a potential legendary BHR product

 

I contend that the issue is less the tube length but more a result of the crappy packaging at the end to make it mate up with the OE catpipe; ineffective merge and 2.625" outlet. I have virtually no tube length in relative comparison on my custom manifold and still pull numbers at the top of anything ever posted on this forum.

However, what you want is easier to build than you seem to realize. Simply take a Racing Beat etc short header, cut it off before the merge, extend the pipes with slip connectors in any lengths you want to test, with a proper slip merge on the end with spool pieces to account for the various length changes, and have at it on the dyno to figure out what you think works best

 

Also, whenever you remove the manifold/header ALWAYS use a new gasket and six new mounting nuts and the torque setting as stated in the factory service manual. This not a place to cheap out or get half assed.

 

There's a picture you didn't need to paint.

 

Sorry, couldn't contain myself.

 

this?

sorry don't know anything about it just found the pic

 

I am not sure how effective that exhaust would be on a Renesis. I am going to dis-agree with some of the above, as a "long-tube" header does seem to add power, and the exhuasts that are working on my 8's are likely nothing like what you would expect. I will agree with most however and say that all of the off-the-shelf stuff seems to make about the same power.

 

Are those dual HJS cats? Where did you find that pic?

 

this is where the F&F mindset fails; appearance does not the best performance part make ...

 

Ok, so at long last I had about a foot of extra length added to my existing Racing Beat Header and the Racing Beat Midpipe shortened to fit. Some pics are attached.

It wasn't super hard to do (for an experience fabricator) and seems to fit just fine.

Next race is in a couple weeks so I'll report if it seems to help at all.

A couple of pics are attached.

 

would it not make more sense to test it out before a race?

 

Nice, I never thought of modifying a short tube like that before, I was going to try and have one made from scratch.

Let us know how testing goes, I might have to try this.

 

Well... sure I could throw my street muffler on and drive it around the street before the race just to make sure it's not going to fall off or something. I could put the car on the dyno but as I have no BEFORE dyno numbers it wouldn't really tell me anything. Honestly, I'm not expecting more than a couple horsepower from this mod. But every little bit helps.

By using an off the shelf short header and having it lengthened I THINK I saved a lot of money as full custom headers tend to be very expensive. The fabricator charged me $180 for add the foot of length to the header and shorten the midpipe. Not bad in my opinion considering that is was good qualify work.