Same here. I have a kraftwerks and i too am looking for a nice header.

 

i have one for sale but it was used on a N/A setup that got decent gains and great gains with a tune. my invidia q300 plus the header made 10 more peak whp. i never saved the graph which i should have. the header is the old type T1R header, the power header. it was replaced by the response header.

 

OkiDan, I am running a Comptech Supercharger/Aftercooler with only a Berk HFC change to the stock AP1 exhaust. Since you installed
the Comptech header later, do you have before and after dyno charts that show the gain the header made? Also, what other changes have
you made to the exhause system, i.e. aftermarket exhaust. Does the Comptech header make more noise (in the engine compartment) than the stock header?

Jerome
NW Arkansas

 

Bump

 

I was hoping to get a few dyno pulls before n after my installs but never made it happen. I have the Comptech SC/AC and Comptech Header, Berk High Flow-Cat, and T1R Sparrow Dual.After installing the header I noticed what I thought was a seal leak, but after checking everything it was only the rushing sound of all the air being force through the headers. It seemed a little less responsive but after a tune well worth it, after I get my suspension tuned I hope to up my boost shooting for 12psi with meth. Hope it helped just remember guys after a few bolt ons you should install a AF gauge, with the larger pipes the boost will drop and the tune will run leaner. Always try to keep your car tuned up, otherwise you can face a blown motor and broke pocket...

OkiDan
Germany
On the sunny days riding the nordschleife
[attachment=20074:RING=).png]

 

OkiDan, Thanks! When I had the supercharger/aftercooler installed, I had AFR, Boost, and Fuel Pressure
guages installed. The WB O2 sensor for the AFR guage was installed just opposite the OEM O2 sensor on the head
pipe. With the 7 psi pulley at 8,800 rpm the intake manifold pressure is 6.5 psi. You lose about 0.5 psi
pushing air through the aftercooler. With 91 octane gas and running the stock exhause except for a Berk HFC,
my 2002 S2000 max dyno reading at rear wheels was 309 hp. Engine management is still OEM with only the Comptech
little black box fooling the system when boost is present.

 

Never replied to my PM, did you do anything diffirent other then use the black box with the 7lb pulley?!!
And what kind of A/F reading are you getting with that set-up?! thanks Dan



https://www.s2ki.com/s2000/topic/954...-legal-header/ Ask him for pics mite be a good deal...

 

Dan, No, just using OEM system with the Comptech black box. Fuel pressure was increased using the adjustable fuel pressure
unit that came with the supercharger kit. At highway speeds air/fuel mix is about 14.5 to 14.7. At wide open, mixture goes down to
12.7 or so. Mileage on NW Arkansas mountain roads with normal driving is between 25 and 27 mpg.

Jerome

 

Dan, No, just using OEM system with the Comptech black box. Fuel pressure was increased using the adjustable fuel pressure
unit that came with the supercharger kit. At highway speeds air/fuel mix is about 14.5 to 14.7. At wide open, mixture goes down to
12.7 or so. Mileage on NW Arkansas mountain roads with normal driving is between 25 and 27 mpg.

Jerome
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Where did you get the pulley n belt from, Scienceofspeed seem to only have 6lb 9lb n 10lbs or what are the measurements of the pulley 4.4" or 4.2" Thanks

 

Dan the 7 psi pulley & belt came from Comptech as they are the ones used in their AP2 S/C kit. The reason that Comptech used a smaller pulley on the 2004 and later m.y. S2000 cars is they are limited to 8,000 rpm redline where as the AP1 2000-2003 AP1 cars have a 9,000 rpm redline. The extra 1k rpm of an AP1 car using the AP2 smaller diam. pulley gives the extra 1.5 psi boost. I will have to dig out my Comptech file and report later on the 7 psi pulley diam. I will report the results here later.

Jerome