sedonabruce

Has anyone heard of SDJ headers? How do they stack up against Racing Beat, etc.?

KSTIIdude

They create more HP, but raise the power band. If you're looking for a racing application, it's worth the money. For street purposes, I'd stick with Racing Beat.

riceburner1r2001

iTrader: (4)

too fu..... expensive

DaveB

I have both and this is what I have observed from dyno runs on each.

The SDJ is designed to maximize the torque curve of the engine while opening up the powerband at a lower level.

The SDJ is all stainless steel and the welds are art.

The RB has a welded in bung for an O2 sensor.

Yes, the SDJ is more expensive, but you get what you pay for.

rotaryengineering

DaveB,

What type of application do you use the SDJ Header for? Can you tell me if you use the SDJ header with the cross-over tube or the plane straight pipe unit? I have been try to figure out if anyone is able to make more power or less power with the different units.

Thanks
Albert

DaveB

I am using it on an S5 set up as an SCCA ITS road race car. It has the cross over tube in place. All my dyno time and Stan's dyno time indicate that it creates more torque earlier and more horsepower earlier. I have an RB on the shelf that I will probably put on a street car.

DriveFast7

iTrader: (1)

Would adding a cross over tube to a RB header have any positive affects? If so how far down the header should said cross over tube be added?

rotaryengineering

This is suppose to be top secret stuff according to some people on this Forum. I say this is BS.

I have seen a couple of different headers with cross over pipes, and the one that made sense to me were about 7 to 10 inches away from the rear exhaust port. So if your using a Racing Beat Header you would have to chop off the outer tube, then drill a 2" hole on the existing pipe, and the one you cut off. Depending on how much space you have between the 2 pipes is how long you would need to make the cross over piece. Then weld it all back together. A couple of people I have talked to about this seem to think it makes additional torque faster than a traditional dual pipe header. I plan on making one as soon as the parts arrive sometime this week.

Good Luck

riceburner1r2001

iTrader: (4)

why dont we ever see dyno results of this header, doesnt anyone dyno there car with the rb and the sdj

banzaitoyota

A few reasons:

1. The SDJ Dyno is an Analog Stuska Twin Rotor. All the graphs are manually calculated.

2. Stan Closed up shop, I have the rights to produce the headers and I have the Dyno.

3. Fabricator Problems. He know has a full time job elsewhere, had back surgery due to a wreck and is in process of getting his new shop set up. When he is ready, I will have more made

4. Dyno: Its not set up yet. I am in the processing of selling my current house and shop and building a new shop, Takes time when you work full time. I need to install the dyno correctly so I can obtain repeatable results, that costs $$$$. Adding Automatic load control and Digital data collection capablility will run another $15K, not counting the cost of the dyno room.


Like I told others before: The cross-over tube was designed to a specific engine combo, and it would fall on its face an a different combo. So whats the sense of selling you an unproven commodity? I know ther is more power to be found in the P-Port design, but until I have the means to verify/test I am not going to "just do it", I'm not NIKE.

And unfortunately the cost of SS Tubing, SS Mandral Bends and plate has skyrocketed since we last orderd raw material, + the cost of Argon has exploded, so it is going to be hard to keep prices low.