Hi,

does anyone have such sheets? on a b16 would be the best

cause i want to see exactly at which point a 4-1 delivers more high-end power, the (propably) better midrange of a 4-2-1 and so on....

Thanks

 

http://www.clubsi.com/dyno_fj_1.shtml

completly stock with header only

 

here is a comparison....... here are the specs on the header from what i know...

Headertech 4-1 header, out of the head 1 5/8 8" 3" radius stepped to 1 3/4 22-25" merge collector 2 1/2" 2 1/2- 3" transition.

DTR header 4-2-1 sequential pairing out of head 1 3/4 12" 4"radius stepped to 1 7/8 13" pair merges at 2" Y-section 12" collector is 2 1/4" 2 1/4 - 2 1/2 transition...

Engine specs on test motor was B18c with ITR pistons, ITR head, Toda B intake cam, CTR exhuast cam, ITR manifold and fuel regulator.....

if you analize the specs on the header ... the dyno graph will make more since... pipe size and flow radius makes difference in RPM HP and Torque.. TO answer the question is a 4-1 better then 4-2-1...the answer is inconclusive.. becuase you can make a 4-1 header work better then a 4-2-1 and oppisite if you had the header taylored to the engine..... Thats why when you go to a NHRA prostock race pit.. you can fine a whole veriaty of header combinations that all work well....

 

The DC 4-1 vs 4-2-1, don't look at peak power, look at the torque curve(hp is hard to read). The 4-1 makes better overall power.

 

There was a problem in the sampling...but....

this is a stock itr bottom end, toda spec B's, aem cam gears with ITR valve train and a Skunk programed p72 ecu.

lower number is an RSR header with a Tanabe G Medailion exhaust.
higher numbers are a switch to a JDM 4-1 ITR header.

 

Did the RSR header have a 2inch collector, and the jdm itr 4-1 had a 2.5inch right?

 

like 2" and 2.25 i believe

 

what size was the cat?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lip &raquo;</TD></TR><TR><TD CLASS="quote">like 2" and 2.25 i believe</TD></TR></TABLE>

from what i know, the rsr is 2" and the jdm itr 2.38" or 2.5". doesn't that mean that you had to add either a 2.5" b pipe or 2.5" cat to accomodate the itr collector? i don' think that this is a fair comparion. i would love to see the rsr with a 2.5" collector vs. jdm itr w/2.5". i'm sure the outcome would be completely different.

 

not sure what you want me to say?

he asked for a direct header swap between 2 headers... 4-2-1 and then to a 4-1. I provided him a dyno plot. Yes the jdm itr is like 2.3 and the tanabe was closer to the diameter of the jdm ITR's. What he is looking for is how the motor reacted to the different headers...and the differences he's looking for would be more linear if it were a 4-2-1 with a 2.3" outlet and a 4-2-1 with a 2.0" outlet using the same exhaust. Look at the chart..you can see how it reacted differently between the 2 headers other then just peak hp

cat converters was a 3" random tech that was meant for a turbo setup. Its what i used because the price was right.

 

looks like the 4-1´s perfom better overall...

is it the same for a small b16?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Drag-On &raquo;</TD></TR><TR><TD CLASS="quote">looks like the 4-1´s perfom better overall...

is it the same for a small b16?</TD></TR></TABLE>

did you look at the link I posted?

 

ooops.... should look before i write

thanks!

 

On my car. Stock B16a2 with I/H/E.. Here's a Toda vs DC JDM 4-1... Toda has highest peak power but the DC has better low- and midrange..

 

[QUOTE=ce]On my car. Stock B16a2 with I/H/E.. Here's a Toda vs DC JDM 4-1... Toda has highest peak power but the DC has better low- and midrange..

QUOTE]

wow! that is scary. i guess the Toda header is designed for bigger motors. this is the **** that makes me want to cry. going from a $200 header to an $800 header to lose power? omg. the bottom line is jdm dc is by far the best header for the price, hands down.

 

you know where i can buy headertech headers? what about hytech or smsp? you know where i can buy them too? thanks.

 

anyone else notice he reved like 500rpm higher for one of the runs?