going to dyno my k20z3

[blackie]

well i purchased some exhaust stuff to make a nice custom 3 inch exhaust on my 06 si tommorw, we are doing from the header back and elemnating the cat. its going to be all mandrel bent and running threw a big 3 chambered magnaflow 3inch muffler. we will be doing a base run and then another couple runs after the exhaust is done. i will make sure and post the results tommorow night.

[1999_ITR]

Sounds like some good first mods. Keep us posted.

[joe_bocc]

From what I've read, the 06 Si has a resrictive header. Any plans for a new header?

Since your doin the whole exhaust thing why not do the header at the same time? This way you can match the length of the header to the exhaust.

[blackie]

my base line is 186.5whp and 139wtq, im going back to dyno the difference monday, i will let you know what happens

[clark_kent]

Can you post the dynograph?

[blackie]

Ok i finnally had a chance to dyno the difference of the custom exhaust. First off those original number were uncorrected so that 186.47whp and 139wtq SAE corrected is 183.67whp and 136.48wtq. Im giving the difference SAE corrected that way noone can talk smack, these are the low #'s. After the exhaust the power jumped to 188whp and 143.5wtq, with a TQ gain of over 10lbs at 6000rpms. But basically i gained around 5whp and 8wtq SAE corrected on a dynojet dyno. Keep in mind this is on a bone stock SI with no tuning or other mods at all.

[blackie]

here are the dynos, the one that shows a comparison is stock vs 3'' exhaust they read alittle lower than the baseline dyno casue they are SAE corrected.

[remyrounds]

So I know i have posted this before. Is not back pressure good? Three inch is kinda big with no turbo?

[clark_kent]

Very nice. It appears the K20Z3's power falls off a bit later than the K20Z1. Great numbers.

[blackie]

Originally Posted by clark_kent

Very nice. It appears the K20Z3's power falls off a bit later than the K20Z1. Great numbers.

i havent been able to find any k20z1 dyno's do you have a link so that i can check them out?? thanks

[clark_kent]

They are all over ClubRSX.com. Here is one.

http://forums.clubrsx.com/showthread...=3d200whp+club

[Professor15]

wow before vtec that thing looks god awful. Get some Kpro and that thing would really wake up.

[clark_kent]

Yeah I noticed that as well. The VTEC crossover point is VERY evident.

[A L I A S]

Originally Posted by remyrounds

So I know i have posted this before. Is not back pressure good? Three inch is kinda big with no turbo?

lol, OF COURSE....back in the day of b series
welcome to the K series where a 2.5" exhaust will loose you 20 hp

and to the original poster..i gaurintee you, that if you get a header and k pro you'll put down 210...what do you say guys?

[signalpuke]

Back pressure is the devil. The whole myth that back pressure helps low end power is just that, a myth.

[clark_kent]

Originally Posted by A L I A S

lol, OF COURSE....back in the day of b series
welcome to the K series where a 2.5" exhaust will loose you 20 hp

and to the original poster..i gaurintee you, that if you get a header and k pro you'll put down 210...what do you say guys?

That is mere speculation at this point. Not saying that it is not possible but you never know what this new motor likes in terms of cam angles, ignition, etc.

[k24dreamer]

from what ive read the kpro is not desighned to coralate with the new gauges so you would have to choose between gauges or kpro but that is just what i have read hopefully they will be able fix that problem so i can get a kpro for my new civic

[B18c5turbo]

i dont think soo that a 2.5 " exhaust on a stock k20a2 is too small, 3 " is way too big for sure, i dynoed my k20a2 stock with a 2.5 exhaust custom and a catalytic oem k20a2 modified, on a mustang dyno, 186 whp a 132 lbs of torque i am pretty sure on a dynopack or dynojet i would make arround 192-194 whp, without tuning, keep in mind that the k-pro will give you 10 whp. 204 whp exemple + header dtr = 215-220 whp + rbc intake manifold = 235 whp-240 + ips k2 cams = 255 whp easily with a stock bottem end add 12:1.1 compression forged pistons and wow you hit the 265-270 whp for sure, and keep in mind too that the k20a2 spin up faster than a k24, the stroke take too many time to turn up the crank, k20a2 stroke are faster and better

[clark_kent]

Originally Posted by B18c5turbo

i dont think soo that a 2.5" exhaust on a stock k20a2 is too small, 3 " is way too big for sure, i dynoed my k20a2 stock with a 2.5 exhaust custom and a catalytic oem k20a2 modified, on a mustang dyno, 186 whp a 132 lbs of torque i am pretty sure on a dynopack or dynojet i would make arround 192-194 whp, without tuning, keep in mind that the k-pro will give you 10 whp. 204 whp exemple + header dtr = 215-220 whp + rbc intake manifold = 235 whp-240 + ips k2 cams = 255 whp easily with a stock bottem end add 12:1.1 compression forged pistons and wow you hit the 265-270 whp for sure, and keep in mind too that the k20a2 spin up faster than a k24, the stroke take too many time to turn up the crank, k20a2 stroke are faster and better

This is how improper information is propagated on web forums. Ricer math at its finest! Good job. How do you figure you can make 255whp on a stock bottom end K20A2 without ITB or F/I? Show me the dyno plots. KPRO doesn't add a set amount of peak power(which matters none anyway) but rather a substantial amount of power in the midrange.

[blackie]

Originally Posted by B18c5turbo

i dont think soo that a 2.5 " exhaust on a stock k20a2 is too small, 3 " is way too big for sure, i dynoed my k20a2 stock with a 2.5 exhaust custom and a catalytic oem k20a2 modified, on a mustang dyno, 186 whp a 132 lbs of torque i am pretty sure on a dynopack or dynojet i would make arround 192-194 whp, without tuning, keep in mind that the k-pro will give you 10 whp. 204 whp exemple + header dtr = 215-220 whp + rbc intake manifold = 235 whp-240 + ips k2 cams = 255 whp easily with a stock bottem end add 12:1.1 compression forged pistons and wow you hit the 265-270 whp for sure, and keep in mind too that the k20a2 spin up faster than a k24, the stroke take too many time to turn up the crank, k20a2 stroke are faster and better

hahahaha