We just took a 2000 Civic SI with 15k miles and an AEM, JDM 4-1 Header (Heat wrapped), Carsound 54006 cat, Greddy Evo exahust, and VAFC.

Without the header and cat and the VAFC properly tuned to the car, it made 141.0 whp. and 98.3 ft-lbs of tq.

Adding the JDM 4-1 and Carsound Cat and tuning the VAFC to these new modifications (added some fuel up top and leaned before VTEC, based on wide band O2), show great gains . . . . .

When we were finished the car made 150.8 and 103.5!

Yes, 10 whp and 5 ft-lbs of Tq out of a OEM JDM Type-R 4-1 Header on a B16.

Call me impressed.

 

hey impressed.....

but yeah, those are some nice gains.. im on the lookout for a JDM 4-1

 

Didnt the VAFC have something to do with those gains as well?

 

Hw much torque did it make over the before plot? peak HP and Trq, as this board taught me, Doesnt mean anything. Post plots!

 

I think the high flow cat had a big impact too. Nice gains though

 

nice gains!

 

not bad at all

 

nice gains. are you having any problems scraping the header?

-tell

 

Yes. The VAFC was tuned to the mods pre Header/cat. We saw a 5 whp gain peak from the header with the VAFC settings at their preheader tuning settings. We pulled out more midrange and peak with the addition and subtraction of power where needed.

 

Peak means something and is a placxe to start when plots are not handy. All I have is a digital picture of the screen since we forgot the floppies.



Best I can do at this point. We moved VTEC all over between 4900-5300 and saw little benefit other than moving the dip.

Area under the curve is really good. starts out just like previous plot and slowly increases and holds an almost 4 hp from VTEC to redline. ALso notice that the car makes the peak about 200 RPMS later which is a huge bonus.

 

no problems with scraping the header on my Type-R or his SI. THe OEM JDM 4-1 seems to have great clearance compared to others like the DC JDM's

 

Nice graph.

 

Cool nice to know I am putting one on soon what heat rap did you use

 

Since this thread isn't really ITR related since it's a Si dyno I'll post my graph from my GS-R..

the 152.x pull is: 00 GS-R, AEM CAI, ~18 degrees timing
the 163.x pull is: same car and mods as above but with a JDM ITR 4-1 header and carsound 94006 cat added. edit: err no PS belt either. removing ps belt gave it 3hp and 2ft lbs. i'll post the with PS belt plot if anyone wants it.




[Modified by SoFreshAndSoCleanClean, 11:40 PM 7/21/2002]

 

great gains

 

My 00 Si with a DC JDM 4-1, Godspeed test pipe, and a tanabe racing medallion made 150.3 whp 108 ft lb untuned. The header works.

 

nice, gets me excited to know what gains i should see, went from stock cat and mugen header(2.25") to dc jdm and test pipe

 

Dig.

 

Anybody else chuckle at that?

 

JDM 4-1 ownz

My dyno plot: 1st gen. B16a - stock cams with CAI, JDM 4-1, 2.5" exhaust, 62mm TB, fuel pressure regulator and Field SFC tuning.


My tuning session - https://honda-tech.com/zerothread?id=234710

 

Nice.. Thanks for the info Asahi. My next mod is the JDM 4-1 header for my Si. So without a VAFC, I can probably pull 5 hp and close to 10hp with a VAFC and tuning?

 

ya ya dave.

ITR header = ITR I do believe

 

your grph came from 'SpEc ARRRRR tuning'

 

I planned to use DEI, but ended up with a roll of Moroso instead (a friend picked it up for me and that's what the shop gave him). Pick up some hose clamps to secure the wrap and you're good to go.

 

Can't wait to add my Spoon 4-2-1, SMS Testpipe, and Type One B-pipe to my Si .................... now if I only had the money for the B-pipe so I could finish my exhaust