Originally Posted by Battlerobot (Post 2898273)

Are those RS05 reps? I thought they only came in 18in...

Originally Posted by nikitopo (Post 2899374)

They were imported from Japan. You can find them here:

http://www.enkei.co.jp/wheels/racing/rs05/

Originally Posted by Battlerobot (Post 2900311)

Interesting! Just wondering, is there a specific reason why you went with 16 over 17 or even 18?

Originally Posted by new2subaru (Post 2900572)

Can you tell me the sizing on the tires please? I downloaded the pic and zoomed in but I still can't read it.

Originally Posted by Battlerobot (Post 2898273)

Are those RS05 reps? I thought they only came in 18in...

Originally Posted by nikitopo (Post 2904376)

I had the chance to test the new throttle body. I didn't test it thoroughly, because there was traffic and then it started raining. However, I managed to make a few pulls up to 4-5k RPM with partial throttle and one with full throttle. The car has definitely more torque and the engine runs much smoother. I was a bit puzzled how this can happen with just a small size difference, so when I arrived home I studied the stock part.

It looks that the stock tb has some design issues like that the inside surface is quite rough and overall the tapered shape is not very smooth. It is like they glued two different pieces together, but without fitting them exactly. I am not sure if this was made on purpose or just for keeping the cost low. However, these differences together with the size increase (+2mm) of the new tb, gave an impressive result.

Additionally, I didn't see any disadvantages like higher idle RPMs etc. I heard at the beginning there were such kind of issues, but it looks that Toda managed to solve them because this is a revised part (16400-FA2-002 instead of the older 16400-FA2-001).

Originally Posted by Tcoat (Post 2904389)

How did you measure this?

Originally Posted by Mr.Impreza (Post 2930662)

@nikitopo add some pictures of your car! Show us the beauty in full :D

Originally Posted by nikitopo (Post 2979608)

I changed my rims and took some pictures of the suspension. The pictures are in the first post. Next step will be to update the header with the 17MY one.

Changes are that the exhaust pipe branches have been shortened to equal lengths (16MY and previous years had almost equal lengths) and exhaust pipe layout has been strengthened out to reduce pressure loss. Additionally, the pipe diameter has been increased between 5-8%:

http://i68.tinypic.com/nno2gk.jpg

Not too many options here for an aftermarket header. I want to be "legal" safe.


One question:

Is it safe to run OFT Stage 1 tune with the changed OEM header? I understand that it might not be optimal for performance, but do you think the AFRs will be OK?

Originally Posted by Taka (Post 2979754)

Any gains from running a 2017 Header over the 2013-2016 header? I might consider this option also if yes since I bet most people will sell them for super cheap haha.

Originally Posted by Mr.Impreza (Post 2935236)

Stage 1 Tune is great! Happy to know you got it and enjoying the car even more now :)
I love it also!

Originally Posted by nikitopo (Post 2979608)

I changed my rims and took some pictures of the suspension. The pictures are in the first post. Next step will be to update the header with the 17MY one.

Changes are that the exhaust pipe branches have been shortened to equal lengths (16MY and previous years had almost equal lengths) and exhaust pipe layout has been strengthened out to reduce pressure loss. Additionally, the pipe diameter has been increased between 5-8%:

http://i68.tinypic.com/nno2gk.jpg

Not too many options here for an aftermarket header. I want to be "legal" safe.


One question:

Is it safe to run OFT Stage 1 tune with the changed OEM header? I understand that it might not be optimal for performance, but do you think the AFRs will be OK?

Originally Posted by nikitopo (Post 2981389)

I did some checks with the factory tune. It is definitely much better on higher rpm's. I am tempted to stay now with this tune. No idea why the OFT tune is not that strong in the high rev range.

Originally Posted by Mr.Impreza (Post 2985794)

Now you even got me interested in this option.
I wanted the Fujitsubo Header....I still do...if i find it used without a cat burnt out since they seem to have cat failures a lot.
I can't risk buying a header for $2500 with no warranty and having the cat fail.
Also, for legal reasons...i feel better knowing I have a stock header instead of an aftermarket header since I'm already running a catless front pipe.
So, if this 2017 header has some gains over the 2013-2016 one I'd probably choose this as an option and get a custom tune for it.

Originally Posted by nikitopo (Post 2985843)

I wanted to install the Toda Racing header, but it is catless and not legal here. However, I noticed that the branch diameters are almost the same:

Toda: 45mm, 50mm
Stock '17 MT: 45 mm, 48.6mm

http://i63.tinypic.com/o6budl.jpg

Additionally, the shape is similar.

So, I assumed that the new stock header is better for a stock engine. I'll let you know when it is installed. Currently it is on the way ..

Originally Posted by nikitopo (Post 2985843)

I wanted to install the Toda Racing header, but it is catless and not legal here. However, I noticed that the branch diameters are almost the same:

Toda: 45mm, 50mm
Stock '17 MT: 45 mm, 48.6mm

http://i63.tinypic.com/o6budl.jpg

Additionally, the shape is similar.

So, I assumed that the new stock header is better for a stock engine. I'll let you know when it is installed. Currently it is on the way ..

Originally Posted by nikitopo (Post 2986015)

Why are you saying that? Fujitsubo's and Ft-86 Speedfactory's catted headers were giving gains even with the stock tune. The idea is that the exhaust gases will flow a bit better and there will be less resistance in the combustion chamber. I agree that the gains will be better with a custom tune, but I cannot imagine that there will be no gains stock.

Anyway, I'll do a dyno run after the change. Just to be sure that the engine output is good and that there aren't issues with any of the installed parts. If the torque is consistent across the whole range and if the max. output is between 175-180whp, then I'll be satisfied.

Originally Posted by nikitopo (Post 2986015)

I cannot imagine how you can do a custom tune without dyno the car at the same time. Monitoring remotely different parameters (AFR, IAM, FLKC, etc.) will give you an indication that the tune is not causing issues, but not so much if the output is actually better. Fact is that every engine is different and a canned tune might not work always good. Something that worked well on a specific development car, a specific day and with a specific fuel, might not work as well in another car. Stage 1 canned tune on my car was much better on the mid-rev range, but it was definitely weaker on high-rev range. It didn't pull that much after 5k rpm. Maybe the combination with the other parts didn't work so well, although Shiv was sure that the bigger tb will not cause issues. This behavior disappeared when I flashed back the stock tune.

Overall, if there was a good tuner over here then I would make a custom tune. However, they don't know this engine very well. I wouldn't like to make a program with someone who has tuned maybe a couple of FA20 engines. This is a proper sports car and not like tuning a camry. Besides, the stock tune is not that bad. The story that it run a very rich AFR and that it was made in a rush doesn't hold any more. Even the '17+ cars don't run very long with the leaner AFR and after a short time at WOT they start injecting more fuel and change to a richer AFR.



Why are you saying that? Fujitsubo's and Ft-86 Speedfactory's catted headers were giving gains even with the stock tune. The idea is that the exhaust gases will flow a bit better and there will be less resistance in the combustion chamber. I agree that the gains will be better with a custom tune, but I cannot imagine that there will be no gains stock.

Anyway, I'll do a dyno run after the change. Just to be sure that the engine output is good and that there aren't issues with any of the installed parts. If the torque is consistent across the whole range and if the max. output is between 175-180whp, then I'll be satisfied.

Originally Posted by nikitopo (Post 2986084)

Are you suggesting that the AFR will be too rich or just that it'll be possible of more gains with a tune? What I mean... is it safe to run stock?

Originally Posted by nikitopo (Post 2986113)

Some are saying that the '17 gains are 5hp, others saying they are 15-20hp and that the pre-17 models were lower than the factory 200ps specification. Anyway, we'll see... :)

Originally Posted by nikitopo (Post 2986173)

Who specified the official numbers? The engineering team or the marketing department? Don't you think it was too much of a coincidence to specify the initial engine output to a 200ps? Why not 193ps or 197ps?

About the tuning, I agree that if the engine needs re-calibrication then it is needed. The same if the AFRs are out of the factory specs. Otherwise, I am sorry but I am too sensitive with this kind of "business".

I don't think there is a better person to clarify the magic of ECU tuning than this one:

The Magic of ECU Tuning - /ENGINEERED - YouTube

Originally Posted by nikitopo (Post 2986268)

Our disagreement is related with the 5hp gain. You base your argument that this number is official and thats it, although you want to IGNORE that hundrends of dynos were reading the pre-17 model MT cars lower than expected and the situation changed after the revision. Even yourself you confirmed once that the gains are +15hp. I don't know why you changed now your mind. I won't continue to argue with you and it doesn't make sense to dig up your old comment. Thanks for posting to my thread.