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After Some Exhaust & Tuning Advice; Headers + HKS Silent Hi-Power on 5AT
Topic Started: Dec 3 2009, 09:16 PM (1,096 Views)
SilentOne
Stock
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Hey all,

If you have any wisdom to impart, by all means chime in.

I've had zero serious experience modding cars which will be evident in a few more sentences I'm sure.

So, 5AT RS200 (yes, cringe away)

Waiting for shipment on some custom 4-2-1 headers with 2x O2 sensor holes as well as an HKS Silent Hi-Power Catback exhaust system on its way.

First question is to figure out what other piping I should look into.. should I rip out the CAT (2x pre-cats dissolve with the headers) and chuck in a decent resonator to stifle a bit of the 5AT drone.? Will that cover everything needed to get the exhaust happily purring away?

Next set of fun begins with what to do with the tuning side of things.

Early on (funds dependent) I'll have to make do with stock ECU and reset the sucker.
However I've heard that with the 5AT (you can stop cringing any time now :D), doesn't do so well with airflow or fuel mapping.. one of the two I forget which.. when linked up to an after-market ECU.

So where can I go whilst at this stage still sticking with the N.A. 5AT.

With the setup above (plus K&N panel) I should see some small gains but to really wring it out I'm guessing I'd need an aftermarket ECU?

I'm not building a weapon.. it's my daily.. and I'm not going turbo in this car.. maybe my next Tez :ph43r:

So, chime away.
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jtm_usa
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Auckland, North Shore
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if your looking for purely power gains id say take out the cats and have basically just a straight pipe from headers to muffler :o
but if your after a somewhat quiet cruiser below 3k revs id say replace the cats with some highflow ones or possibly remove them and throw in a resonater in.
as for ECU's nick emailed me a while back when i had some spare cash and was looking for an ECU (which fell through for the time being) about the E-Manage Blue which comes with a straight plug in loom (no wiring or soldering etc) and comes pre-tuned for a near factory Tiptronic Altezza!
so deffinately look into that ECU for our good ol 5AT's :)
good luck with the choices :)
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SilentOne
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Cheers JTM - yea spoke to Nick a while back about those ECU's - few months into the new year maybe, unless the company pony's up a bonus :)

re: resonators - if I go down that route, know of any good ones?
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gwin
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SilentOne,Dec 3 2009
09:16 PM
Hey all,

If you have any wisdom to impart, by all means chime in.

I've had zero serious experience modding cars which will be evident in a few more sentences I'm sure.

So, 5AT RS200 (yes, cringe away)

Waiting for shipment on some custom 4-2-1 headers with 2x O2 sensor holes as well as an HKS Silent Hi-Power Catback exhaust system on its way.

First question is to figure out what other piping I should look into.. should I rip out the CAT (2x pre-cats dissolve with the headers) and chuck in a decent resonator to stifle a bit of the 5AT drone.? Will that cover everything needed to get the exhaust happily purring away?

Next set of fun begins with what to do with the tuning side of things.

Early on (funds dependent) I'll have to make do with stock ECU and reset the sucker.
However I've heard that with the 5AT (you can stop cringing any time now :D), doesn't do so well with airflow or fuel mapping.. one of the two I forget which.. when linked up to an after-market ECU.

So where can I go whilst at this stage still sticking with the N.A. 5AT.

With the setup above (plus K&N panel) I should see some small gains but to really wring it out I'm guessing I'd need an aftermarket ECU?

I'm not building a weapon.. it's my daily.. and I'm not going turbo in this car.. maybe my next Tez :ph43r:

So, chime away.

Hahahaha we all say that at first....
then comes the next mod.. and the next... and the next...
next thing you know you end up with a 800HP monster rofl

With any car, you can lean out with a piggy back, i think the challenging thing is always with fuel. But from what I've seen, the 3S motors don't have as much problems as the 1G when it comes to fuel tweaking because there's heaps of things out there (fuel regulator, fuel rails, injectors) + the piggy back.

If you're really not looking for huge gains, I think exhaust isn't really a priority until you start going to blowers, purely based on $ per KW.

The 3S already puts out sufficient power as it is, maybe focus on handling?

----------------
My superbike 0 - 100km/h, 3 seconds
My supercar 0 - 100km/h, 5 seconds
My IS200 0 - 100km/h..... I'm still waiting.
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SilentOne
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All valid point thanks Gwin.

Yea Handling is on the cards.. trying to psych myself into adjusties, but its damn expensive.

If not adjusties, anglin towards after-market shocks and springs.. but haven't travelled far down that path.

Have a front strut on order, and soon to be rear sway.

BUT - back on topic to the exhaust etc :D

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gwin
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SilentOne,Dec 4 2009
11:39 AM
All valid point thanks Gwin.

Yea Handling is on the cards.. trying to psych myself into adjusties, but its damn expensive.

If not adjusties, anglin towards after-market shocks and springs.. but haven't travelled far down that path.

Have a front strut on order, and soon to be rear sway.

BUT - back on topic to the exhaust etc :D

Well you get what you pay for

I used to think ... oh God, $2k for suspesion when I can get springs for $200.

But then it'll cost me another $500 to put the springs in. Ater a year they sag, then i have to spend another $500 taking them out.

Coilovers are pretty much bolt on bolt off... And they last longer, customizable to your driving needs etc etc

Do it once, do it properly
----------------
My superbike 0 - 100km/h, 3 seconds
My supercar 0 - 100km/h, 5 seconds
My IS200 0 - 100km/h..... I'm still waiting.
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xnickx
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^^ You may thank me ^^
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SilentOne,Dec 4 2009
12:39 PM
BUT - back on topic to the exhaust etc :D

The headers are from the GB? They replace the 2 stock cats right? (1 and 2 in the picture)
Like do the go straight from the head down to where A meets B?

Posted Image

What I would do if you wanted to free up the exhaust:
1) Don't go any larger then 2.5" for the piping from the headers to the cat back
2) Possibly remove/replace cat converter "3"
3) Remove/replace muffler "4"
Contacting me for parts

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E910
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MOTUL 300V
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Fitting $200 springs in the first place is just asking for trouble. & $500 to fit them, what the??

Have a read of the suspension section for merits on both set ups. Coil overs can be noisy & hard depending on what model you get. They also require a LVV Cert here in NZ. BC are probably the best bang for buck new. You could trawl TM but you never know what you're getting 2nd hand. Just because they're not leaking doesn't mean the internal seals aren't stuffed.
If you buy Japanese name brand spring you shouldn't have any problems. Cheaper stuff like Jamex may have issues. I've got Tanabe in mine & they're very good. They're available from 41. Another popular choice is TEIN which Autolign bring in. They can also shorten your shocks in their workshop to suit the lowered springs. Then there's always TRD from Nick ;)

If you're going to de-cat then replace it with a muffler or it will sound hideous.

Out of interest what sort of power can the 5AT handle? Say if you were going to turbo one for example.
アルテッツァ RS200-Z 6MT
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roman
Lowered
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It's all too easy to spend a lot of money on a lot of little things which each dont really do much/anything, and dont contribute to the car being better on the whole collectively... End up with a car that's pretty much exactly the same to drive, you've just spent a crapload more money.

In my opinion and experience, drop in panel filters, and replacing a cat converter with a muffler are both a waste of time and $$$.

Best money spent if you're wanting a more aggressive sound, and a bit better flow, is a decent aftermarket rear muffler...

The bend over the diff is probably the 'worst' part of the factory exhaust, and any decent aftermarket unit will have a nicer bend here, and also presumably a free-er flowing rear muffler.

You see them on trademe from time to time, for fairly reasonable prices.

Next best cost effective mod in my opinion is a new ECU with a more aggressive tune on it.

The reality is that modifying NA motors is freaken expensive, and yields minimal results compared to turbo engines.

As I've mentioned previously, I've dynoed a whole lot of different air filter setups on a single VVTI engine, and repco panel filter in the standard airbox made the most power, on par with other setups I tried which cost a lot more time and money.

Also dynoed with a cat converter in, and then replaced with a straight piece of pipe, zero difference in power...
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HOT2XS
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Body-Kitted
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SilentOne,Dec 3 2009
06:28 PM
Cheers JTM - yea spoke to Nick a while back about those ECU's - few months into the new year maybe, unless the company pony's up a bonus :)

re: resonators - if I go down that route, know of any good ones?

Give Caveman a yell. He may have a GReddy blue for sale :)
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SilentOne
Stock
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Hmm thanks for the food for thought guys.

Further opinion then on taking out the stock cat - do I go

a. hi-flo cat
b. resonator
c. inline muffler
d. straight 2.5" pipe

Bearing in mind the aim is primarily power, then a close 2nd being sound (ie less rattle/rasp)

Remembering of course its going from the headers into the <insert option> then into the HKS Silent Hi-Power cat back system.

I'm curious, for the HKS, that's a cat before the barrel muffler right.. hence "cat back"?


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roman
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That system will just bolt up to the outlet of the exhaust manifold, by the looks.

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2JGita
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CHCH
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SilentOne,Dec 5 2009
01:53 PM

Remembering of course its going from the headers into the <insert option> then into the HKS Silent Hi-Power cat back system.

I'm curious, for the HKS, that's a cat before the barrel muffler right.. hence "cat back"?

Not sure what you have ordered but I don't think the Silent Hi-Power comes in a cat back. I also have this muffler but its only diff back. The system in the pic is usually what they have for turbo cars.
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SilentOne
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2JGita,Dec 6 2009
02:09 AM
Not sure what you have ordered but I don't think the Silent Hi-Power comes in a cat back. I also have this muffler but its only diff back. The system in the pic is usually what they have for turbo cars.

Hmm not sure how acurate the picture is, grabbed it from one of the many that seem to be out there.

Have ordered through Nick so it'll be the right one, just me getting the wrong idea I guess.
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