DC2R modding questions ...

[joey99]

Hi guys (and gals),

I've now had my DC2R for 2 months now. it is all stock except for a K&N pod inside the airbox. I am now finding it abit low on power compared to what I'm used to (silvia S15) ... although handling is perfect and will out shine my old S15 anyday. so I thought it is time to do some mods.

so just a few questions.

1. since the DC2R is so well engineered already, does it respond well to just headers, hi-flow cat and exhaust ? are the gains just minimal due to the factory ones being well tuned already ? do people think it's worth it ? and is it noticeable ?

2. I really haven't heard any good exhaust sounds from hondas ... usually very farty ... and just sound horrible usually. I had a mugen twin-loop on my old EK and even that didnt' sound particularly good. the only exception is this white S2000 I see flying around sydney that sound like a jet flying past. Anyone have an opinion on what sounds nice ... but an important thing is that I don't want anything that will sacrifice any low-end. at the moment I'm looking at the fujitsubo RM01A .. but liking spoon as well but don't know anything about that. anyone got some sound files or dyno stats on these ?

(I just watched a very riced up silver prelude with big chromes drive past this morning and it just sounded like a bunch of big flies or bees flying past ... I really just dont' want that. Really just sounds silly.)

3. are headers, hi-flow cat and exhaust all there is to do for these without going internals ? I don't have the budget nor I want to open up the engine.

4. 4-2-1 seem to be the way to gain on low/mid range ... spoon or Js-Racing? are they really better than the stock ones ? Would it help if I only changed the headers and high-flow cat keeping the exhaust stock ? or would that just defeat the purpose ?

5. what do people change first ? headers or cat-back ?

I would like to get a 0-100 in 6sec car. is that possible with these simple bolt on mods ? or am I just dreaming ?

sorry about the long questions .. but I look forward to everyone's response.

thanks in advance.

[macoman69]

Really depends on the quality of your engine.
4-2-1 headers are best for mid to high range gains. You really wouldnt see any gains though keeping the stock exhaust. I know because i did it as well. BUT when i did get exhaust I noticed a very BIG difference. So if you can change them at the same time but if you cant buy the headers first and wait to install untill you buy exhaust because you might have trouble with bolting on a JDM header to AUDM Exhaust since JDM Cat is different size and so are flanges.

But what you have to understand is that Honda's are very fiddley and wont get gains with any part like a turbo. So you need to get a high quality header if anything. Ive never had experience with Spoon or J's Racing but from what ive seen and heard (Videos Etc) they seem pretty good.

0-100 in 6 sec is possible but not without exhaust.

Other mods you might look at doing are things like Upgraded throttle body, proper intake, and ECU would see you getting some good gains (Hondata, MOTEC, Power FC, ETC)

But then again every ITR i have seen is different some are fast some are hell slow and I think this is mainly due to how the car has been kept and quality of the engine + Driver.

If you want some sound files jump an youtube and type in Spoon N1 + DC2 or integra or whatever exhaust sound your trying to hear should have what your looking for.

[joey99]

how much gain would I be looking at with a well tuned ECU alone ? or does that really need to have the parts to support it ? ie. full exhaust, etc.

[macoman69]

I would say you would probably need the parts to support it. But im not 100% sure. Alot of ppl say ITR is tuned well from factory but i hear from the Hondata website that Honda do something with the ignition at lower RPMS for fuel consumption of O2 levels something like that.

I would get ECU last just because that way you dont have to keep paying for tune. Tune will put you back about $600 per tune. Not Cheap. So get I/H/E first before doing ECU.

[Q_ball]

http://www.ozhonda.com/forum/showthread.php?t=18699

Read the stickies dude, been covered many many times.
If the stickies dont have what you want, then try searching manually

[xtercii]

Try Spoon n1 exhaust, it’s quite loud but sounds hectic.

As for performance ppl on this forum have done mid 13s with basic exhaust intake mods and a tune.

[nipnip]

if your gonna change exhaust do everything at one, header, cat, catback, otherwise u have to cut and weld each time

and i honestly think this whole 4-1 vs 4-2-1 is a tad overrated... i changed the header first to 4-1 (which required cut and weld), and there was no noticable loss and a good dyno readout

[.::F[L]Y::.]

hey dude, if your interested i have an I/H/E + hondata package that i might be selling. Has done mid 13s

pm if your interested.

[joey99]

PMed
thanks

[dc2r]

1. Changing to aftermarket headers, cat, and exhaust will give nice gains. The most restrictive part on a stock DC2R is the headers. However that being said, consider getting a CAI (Mugen or Injen) as this will definitely give good noticeable gains/response.

2. I have no dyno charts of the exhaust, but if you go to the website (its in Japanese) http://www.fujitsubo.co.jp/index.html then it should show you some. Here is a sound file of the Fujitsubo RM01A on a DC5R: http://www.fujitsubo.co.jp/imglib/sound/00000000000000002310.rm

3. I don't quite understand your sentence, however you can change your headers and exhaust without doing any internals.

4. If you want low-mid range then get 4-2-1 headers. Proven with probably the most gains and highly popular is the Toda headers. It is advisable to change the whole exhaust from the headers as it will be easier, however if you do keep the stock DC2R exhaust, you will still notice an improvement with just the headers because the stock DC2R cat-back is actually pretty good.

5. People change what they want to first, however if you want some advice, I would change the headers first before the exhaust. However again more advisable to change headers and exhaust at the same time. Even more advisable is to get a CAI before anything else! (See answer to question 1). But its up to you how you want to mod your car.

6. It is possible to make a DC2R run 0-100 in 6 seconds with bolt-ons. Probably I/H/E and ECU. Although just changing I/H/E will get you close.

[iaquinta]

Why does no one show love for the stock dc2r intake? It's awesome. Best of all, it comes WITH the car. That said, if you must have the best, mugen intake is the way to go.

Just get a good set of 4-2-1 (or 4-1) headers and a lightened fly. ECU retune for a changed exhaust system is quite overkill.

[joey99]

thanks for the advise ... I bought the car with a TODA lightened flywheel and excedy 5puk clutch already installed.

will be shopping for a full system I think and do it all at once.