cat back power increase?

[D'janiero]

Yeh, I dont know why people say they feel increases when its already proven on a B18. Probally if their cat is full of **** then they might cause a restriction. You more likely feel an increase of Throttle response than power increase.

 

[blinx9900]

oops,still a 6whp gain for a catback on an stock ek9 is bullshit

we are talking about CATBACK increases
and theres noway 6whp can be made over the stock ek9 cat back system which itself is very good
have you an ek9 or tested both or you just picking figures from the sky??

only reason that sounded chheky is because you know you just picked figures from the sky to suit a bhp figure.....and the estimate is always higher than the actual figure for your pubtalk.....

as olly said,the header and cat are restrictive but the oem ek9 catback is a very very good system and you wont gain much from changing it

It is possible, i have seen it, we don't have ek9 in my country but i have seen other cars with B series engine's gain 3-6whp from catback exhuast, i been doing this crap for 8 years and have been present for MANY dyno sessions...

but think what you want...

 

[denward]

ive seen a lad get an extra 10bhp on an eg6 SiR from a HKS Hi Power Silent cat back

he changed the exhaust on the same day. i seen the 2 dyno runs...

 

[*SPOON*]

It is possible, i have seen it, we don't have ek9 in my country but i have seen other cars with B series engine's gain 3-6whp from catback exhuast, i been doing this crap for 8 years and have been present for MANY dyno sessions...

but think what you want...

your missing the point...

on other b-series etc its possible but noway on an ek9 will you gain near 6whp from a catback exhaust

 

[Bon87]

your missing the point...

on other b-series etc its possible but noway on an ek9 will you gain near 6whp from a catback exhaust

What if it was a true straight through exhaust, no resonator, no cat, no bends (maybe 1 bend) .........?

 

[jugbugz]

your missing the point...

on other b-series etc its possible but noway on an ek9 will you gain near 6whp from a catback exhaust

yes I agree. you can see heaps of results from a B16A and B18C compared to a B16B.

 

[RagingAngel]

your missing the point...

on other b-series etc its possible but noway on an ek9 will you gain near 6whp from a catback exhaust

Good GOD....

6whp isn't such a hard figure to fish out of a well designed catback system even if it's on a B16B.

It might not show these gains till the very top, but it's still a gain isn't it? A lot of people have the perception that 5-6whp is gained throughout the usable rev range, from 3000-8000rpm.

Something that is a larger - 2.5in diameter may actually show slight losses but might show that 6whp gain from 6000-redline - since the 16B runs rich like other DOHC VTECs up top. With remapping, it might pick up power everywhere under the curve...but that's another story.

Give it a break... it can be done and has been done.

 

[blinx9900]

your missing the point...

on other b-series etc its possible but noway on an ek9 will you gain near 6whp from a catback exhaust

I'm sick of people trying to argue with me, 6whp is NOTHING, allow me to ask you a question, how many honda's have you built? how long have you been doing this? how many dyno sessions have you been to?

i have been doing this for 8 years, i built 5 honda's of my own and numerous other ones for customers and friends and been present at many dyno sessions, unless you have experience to back up your claim that its not possible STFU!

i swear some of you guys thing 6whp is a gift from god or something, its nothing, I've seen a 6whp gain from new spark plugs and fresh oil! So seriously if you dont have experience STFU!

 

[jugbugz]

I think with tuning, theres more to be gained... but thats with everything...

You'll definitely gain up top above 7000rpm but loose the bottom and mid range like raging angel said, but that can all be regained when you adjust timings and tuning.

blinx: dont mind if I correct you but changing oil and spark plugs is just a service example. It wouldnt gain 6whp though... it'd just restore lost power.

I think the question is a little too simple...

 

[blinx9900]

blinx: dont mind if I correct you but changing oil and spark plugs is just a service example. It wouldnt gain 6whp though... it'd just restore lost power.

of course, it was just an example to show that 6whp can be lost with old oil and plugs, just an example showing how minimal 6whp is.

 

[jugbugz]

This is not for debating purposes but look what I found from ITR forum.

Stock vs catback

 

[RagingAngel]

which proves my point exactly.... there is 5-6whp at SOME points of the graph. Look at 6000-6200rpm.

That's a gain. With this particular setup, there is NO losses... which is great... but because it does run rich up top, there is a few more ponies to eek out which is better than the stock setup.

Moreover, one could stand to lose up to 10-15lbs off the stock setup which in itself is another "gain.".

 

[jugbugz]

which proves my point exactly.... there is 5-6whp at SOME points of the graph. Look at 6000-6200rpm.

That's a gain. With this particular setup, there is NO losses... which is great... but because it does run rich up top, there is a few more ponies to eek out which is better than the stock setup.

Moreover, one could stand to lose up to 10-15lbs off the stock setup which in itself is another "gain.".

Yes your right! I guess most people just post up the peak figures to compare. the 2.5" mates very well with the 1.8L... very surprised there was no losses... but from the thread where I got this from, they were testing all sorts of headers and had the fuel adjusted to suit every application. This made the test fair, therefore no losses were made.