exhaust and cold air intake advice

[EUR003act]

hey guys (and girls).

i just finished installing a custom exhaust and short ram/cold air intake on my '03 euro. i wanted a quiet (almost stock car) when driving normally, but loud race sound when accelerating hard :D

thats exactly what i ended up with so im very happy, if anyone has any questions on what i used or any advice on things they've done, let me know, im always happy to help.

cheers

[Euro76]

What CAI do you use?

[[ricer]]

list everything u used and what u did

[m3ntAL_l2]

eeeeerr twin loop?

[SiReal]

probabaly twin loop with 2 1/4 piping with mega hotdog resonator

[luv_psi]

I would be interested to know what you used for the exhaust side of things.

Mayb even if you could post up a sound clip of the exhaust note at different revs, if possible.

[as001]

please provide details of the mods you made piping, type of mufflers used configuration etc


hey guys (and girls).

i just finished installing a custom exhaust and short ram/cold air intake on my '03 euro. i wanted a quiet (almost stock car) when driving normally, but loud race sound when accelerating hard :D

thats exactly what i ended up with so im very happy, if anyone has any questions on what i used or any advice on things they've done, let me know, im always happy to help.

cheers

[EUR003act]

ok starting from basics,

at first i had straight through piping (2 1/4) from the cat all the way back to the twin mufflers, in essence taking out the two central mufflers. however, i had alot of high pitch noise and it made the car sound like a hyundai. so i had a high-flow hotdog resonator put in closely after the cat convertor, (just a generic brand) that got rid of the high freq whine and kept it fairly quiet at low revs (only slighty more noise above 5000 than stock).
i then installed K&N typhoon CAI (only short ram for now, will install full piping closer to summer when i have more time). no real sound level difference for normal driving (slightly more airry sound) and you can definately hear the difference when vtec kicks in (awesome sucking sound). but as you put your foot down and the throttle body opens wide, you get a very nice loud destinctive low grumble (almost like a wrx). sounds very nice around the 4-7000rpm range.

im getting the car dyno'd on the 22nd july, so ill let you know how that goes once i have results.

i have picture of the set up here, and i will try to get sound clip for you guys aswell :D

cheers

FYI - K&N kit extremely easy to install! probably a 15min job, anyone could do it

[[ricer]]

so you still have stock mufflers?
no wonder its quiet

[BiLL|z0r]

2 1/4" seems kinda small. That's the ideal for 1.8/2.0Ltr Lancers and the such. I would have thought 2 1/2" at least.

[EUR003act]

yeah still stock rear mufflers, but from what ive heard theyre fairly good when it comes to high flow... i guess ill find out how well they work when i get it dyno'd :D
i didnt wanna go 2 and 1/2 because sometimes with small 4cyl n/a engines you need that back pressure there (and also 2 1/2 can give a fairly loud idle note).
but how knows, its all experimental at the moment, and i had flanges welded in at each point of connection so its easy for me to plug and play...

[[ricer]]

i wouldnt think 2.5 would be too big for a k24 motor
im pretty sure the EGK20A EG with the k20 is running a 3inch set up

[EUR003act]

2L motors should only ever go 3inch if theyre charged (whether turbo or super). you dont get any gain above a 2.5 in small n/a motors, you can even loose power by going to big. this is what ive been told by multiple exhaust guys that have been doing custom setups all theyre life

[blk05gli]

it will be interesting to see the dyno results - nice work though

[ginganggooly]

2L motors should only ever go 3inch if theyre charged (whether turbo or super). you dont get any gain above a 2.5 in small n/a motors, you can even loose power by going to big. this is what ive been told by multiple exhaust guys that have been doing custom setups all theyre life

I doubt these exhaust folks would have had much experience with k-series race cars... The results speak for themselves really. In fact, all the sub 13 second k-series hondas i know of are running 3" exhausts.

[EG5]

I doubt these exhaust folks would have had much experience with k-series race cars... The results speak for themselves really. In fact, all the sub 13 second k-series hondas i know of are running 3" exhausts.

3 inch FTW , As Slim said - results speaks for themselves :thumbsup:
Tried 2.5 and 3 inch on our k20a eg already. We dont lose power at all running 3 inch

[Omotesando]

You don't lose power but do you lose low-mid rpm torque?

One would assume the 3 inch is great for high end power at the sacrifice of low rpm grunt. If you'll be revving to 9500-100k rpm I guess 3 inch is better.

?

[BiLL|z0r]

100k rpm, wow that's a high reving engine ;)

[EUR003act]

I doubt these exhaust folks would have had much experience with k-series race cars... The results speak for themselves really. In fact, all the sub 13 second k-series hondas i know of are running 3" exhausts.

excellent point there... and as said later on, im guessing you lose alot of low end power/ torgue? and as for noise, im guessing constant drone while cruising?

[Omotesando]

100k rpm, wow that's a high reving engine ;)

Yeah sorry I couldnt count lol. Should have read 10K RPM you cheeky boy :P

[ginganggooly]

excellent point there... and as said later on, im guessing you lose alot of low end power/ torgue? and as for noise, im guessing constant drone while cruising?


I don't know for sure as i've never seen the two graphs overlaid. I would assume that you would sacrifice some low end power. Sometimes the drop is quite small- I went from a 2.25" to a 2.5" on my b18c and had solid gains from 3k rpm onwards with a negligible drop below that point...

In terms of noise- not really, I've been in a few vehicles with 3" systems that have been reasonable, and i've been in a few cars with 2" systems that were absolute barry crockers... I think the choice of mufflers, resonators, lengths etc have a huge bearing on this.

[Omotesando]

But pls remember 2.25 inch to 2.5 inch is a much less significant jump compared to 2.5 inch to 3 inch piping.

The piping area of 2.25 is only 4 square inches smaller than 2.5 inch.
The 2.5 inch jump to 3 inch piping is 8.8 square inches more, or 12.8 squre inches more than a 2.25 diameter piping.

In other words, the jump from 2.5 to 3 inch has increase the pipe area by more than 200% than the jump from 2.25 to 2.5 inch. and that's not taking into consideration the difference between 2.25 to 3 inch!

So there is most probably going to be a much more significant loss in low-mid-range power going from 2.5 to 3 inch than 2.25 to 2.5 inch!

[ginganggooly]

But pls remember 2.25 inch to 2.5 inch is a much less significant jump compared to 2.5 inch to 3 inch piping.


You need to take into consideration that I'm comparing a 1.8L b-series to a 2.4L k-series. The k-series heads have much better flow, and the bottom end has an additional 600cc...

If i were to fit an aftermarket exhaust to the euro, i'd fit a 3". I imagine you'd need to be going a little further than just bolt-ons to really get a decent benefit from a 3" exhaust.

[EUR003act]

all good points, and as i said at the start, i wanted a very quiet exhaust when not driving hard (i do alot of 3+ hour driving). and yes i definately agree, if you went 3" you'd definately have to do more than cat-back (extractors would be a must) if you wanted high power gains...

i suppose my questions will be answered on sunday when i see my dyno results! :D

[as001]

Anyone with a Euro with a 3 inch exhaust and says it aint that loud has got to be kidding...

[aaronng]

Also take into consideration the RPM that the engine operates. :)

[EUR003act]

Anyone with a Euro with a 3 inch exhaust and says it aint that loud has got to be kidding...

im glad someone agrees with me lol

[aaronng]

A 3" with the proper resonators and mufflers will be quiet. It's only when you go for cannons and hotdogs (or no resonators at all) do they get loud.

[EUR003act]

2 1/4 exhaust = 130.9kw

i see no need to go 3 inch considering i still using stock headers and mufflers...