nikitopo's BRZ OEM+ build

[D_Thissen]

Originally Posted by Tcoat

How did you measure this?

Its the very precise method of, "I spent money, so it must do something". Like I said in another thread, I think its placebo, but I would be happy to be proven wrong with some dyno results.

[nikitopo]

It's not about "I spent money, so it must do something". I 've spent money on other parts and I couldn't feel any difference, or made a difference but they were disturbing the overall balance of the car. It could be possible to use even individual throttle bodies (ITBs), but for me it would be too extreme. A car that uses ITBs is running currently in the VLN races at Nurburgring and they claim to have a power output of about 260 PS.

[nikitopo]

Another close-up picture of the Enkei RS05 wheels in the upgraded STI racing car:

[nikitopo]

This arrived today ...

[Taka]

This is a good build, I'm watching

[nikitopo]

I decided to not use the old top mounts and to order new ones from the factory. Main reason was that it would cost me almost the same to remove the old ones and install them to the new coilovers (work labor is very expensive here!). As an additional benefit, the new top mounts have different part numbers and they are stiffer (harder rubber?). They pair better with the stiffer coil springs and can be approved by TÜV. I think that camber plates cannot be approved.

The rear top mounts were used in the BRZ tS model and the front ones I was informed that are used now in the revised BRZ model. Probably, because the new stock front springs are also stiffer.

[Mr.Impreza]

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

[nikitopo]

Originally Posted by Mr.Impreza

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

Thanks. I'll update with some nice pictures. Currently too busy with family issues.

I also have on the task list to install the Sachs coilovers and a Stg1 OFT tune. Toda Racing said that the throttle body will work better with a tune. Shiv said that no changes will be needed to the tune. The Stg1 tune should work fine.

[nikitopo]

A few days ago I installed the Stg1 OFT tune. Congratulations to Shiv for his professional job and the results. The tune works as expected and there are no negative issues with the bigger TB. I am more impressed with the smoothness of the engine and the much better torque curve in the middle RPM range. Reason of the latter is the "removal" of the inner EGR (Exhaust Gas Recirculation) system. Evidence that the EGR can be removed, only with an ECU tune, is the following article:








I have not done yet a WOT up to the redline, so I cannot comment about gains on higher RPMs . Just waiting the ECU to learn a bit better the new mapping.

[Mr.Impreza]

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

[nikitopo]

I installed last weekend the Sachs performance coilovers. Very pleased with the result and the car sits much lower. Height from bottom up to the fender is now 65 cm (25.6 inches). If I recall correctly, stock height was 67-67.5 cm.

[nikitopo]

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%:



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?

[Taka]

Originally Posted by nikitopo

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%:



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?

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.

[nikitopo]

Originally Posted by Taka

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.

It is a notably higher flow header, because in Europe it could not pass the regulations. You'll be lucky if you can find it super cheap. It should give a bit less comparing to a good aftermarket catted header. Reason is that it uses a normal cat. Current estimation is +5whp without a tune and everything else stock. Personally, I expect to gain a bit more because of the bigger throttle body. I don't have yet any change in the exhaust parts. Maybe a gain of 6-7whp, but of course I'll have to dyno the car. I'll post again when I have more information.