1badFB

iTrader: (1)

Ok, so I had contemplated which header I was gonna get for so long, looked into the long vs. short primary systems. I thought I had it figured out, and bought the uncollected header, but after reading up on it a little more, everyone seems to say something different about lengths on the primaries. Could someone tell me the length from the flange to where the streetable header collects, so I can use a tried and true length primary. Or maybe someone could even be more specific as to the length that will gain me the most power. Ive read all the theories, I just need a proper length here. (This is going on a stock port engine, but a streetport might not be too far away. Also powerband doesnt need to be way up high as it is a streetcar.)

1badFB

iTrader: (1)

Can anyone at least steer me in the right direction?

dbragg

iTrader: (7)

honestly, just get the racing beat collector. i think i paid something like $50 shipped for mine a year ago. the price may be wrong. your car is a street car, its honestly not that important. i dont think its a big enough deal that youll notice a difference. thats just my 2cents

1badFB

iTrader: (1)

I have the racingbeat collector! I just didnt know if it would make good power without adding a center section in. Is it a wise idea to just slap it on there?

dbragg

iTrader: (7)

bolt it on good and tight. make sure you have a gasket though

Stevan

iTrader: (17)

The longer the primaries the better, in the RB streetport system the 2 pipes that go over the axel are the collector, drawback 2 pre$ilencer$.
I was going to chop and extend a RB collected header(while keeping primaries equal length), and try to connect my presilencer directly to a single inlet primaflow. I got lazy and decided that the increased length wasn't worth the work, yours is already cut with the flanges welded on.

1badFB

iTrader: (1)

Well from what Ive read simply extending the primaries can take away from the power output of the engine. From my understanding there is a primary length in which the exhaust pulse most effectively draws air from the opposing primary, and as long as the collector meets at that point then it will acheive best power.

Then, on top of that: squeezing as many full waves out of the system should increase power a bit as long as the wave ends at the same place in relationship to the collector.
With that simply adding length wont help unless the wave hits the collector at the same point.

Now... since I have no idea what a good tuned length is for a 1 3/4" ID tube (racingbeats tubing of choice) I was just gonna slap it together like a collected header since Im sure they collect at a decent spot, But I cant even find out how long they are (and I have this feeling they are shorter than just slapping the RB collector on the uncollected header.) So Im a little stuck.

I would really love a long primary system but short of going to the full RB unit, no one can suggest a good tuned length.
And now, I cant even find a length for a short collected system.

SO..Please let the exhaust master come fourth and suggest something.

P.S. with everything people are doing to these cars, all the time, and $$ it saddens me to think that so few people really know how to put together a good homemade exhaust system. Especially since this is the most common mod to these cars.

1badFB

iTrader: (1)

bump

1badFB

iTrader: (1)

anyyyone??....

1badFB

iTrader: (1)

No help ehhh??????

craigw1

i don't have exact measurements, but i think in your case (stock) you're not going to notice that much power diff...maybe you'll have a diff sound. There are lots of debate about long v short systems...some say long primaries good for street port and short system good for bridge port, etc.

Mine is street port, I used the RB uncollected header, and got local shop to build the rest. sounds great. check out http://www.youtube.com/watch?v=nv_zAuYSsCc

header


centre section


rear collector


rear box (can replace the packing)

Jaime Enriquez

That sounds nice and tight!!! Love the highway blast.

How big are those primary pipes? Size of those centersection mufflers?

Jaime Enriquez

For what its worth...the SDJ header is said to make the most power and it collects much earlier than a long primary system, but has a larger collector than say the RB streetable.