2017 BRZ Performance Package Impressions

[spike021]

Originally Posted by mjanmohammad

I keep my car below 4k for 90% of my daily driving. Fuelly shows I'm averaging 26MPG, but there was a track day in there where I averaged 11MPG. Full stats are in my sig

Yep, this is about right for me. I think I'm at 25.5 MPG right now but it increases almost every time I drive. Mixed City/Highway.

I kept it under 4k RPM during break-in and now only occasionally go above 4k like on highway pulls when I want to get up to speed quickly.

[~el~jefe~]

i am at 27.5 around NY City. I found in traffic it gets 26 mpg never less. It gets worse driving it around normally without traffic. I have gotten 31 mpg on highway not going slow at all. It is increasing on the highway and 1mpg more local runs. I duno if it is at all accurate.

[Gforce]

Originally Posted by artongdou

I took my yellow to m1 concourse a few weeks ago, and it was a sunny day! That was the first track day experience I've ever had, and it was fantastic. But the car feels a little bit understeer after apex. I am not sure it was me or the car. But if I backed off the gas a little bit, the car rotated pretty well.

Anyway, it was a lot of fun!

Remember the Torsen differential will cause the front end to push if you get on the gas a bit early. You want the front axle turned in before you step hard on the gas. The idea is you are already unwinding the steering wheel as you pass the apex and just as the rear axle starts really accelerating the car, then the diff is helping you. Jumping on the power early is a common error and you get understeer right away.

[Gforce]

Originally Posted by strat61caster

When your driving gets consistent I bet you'll notice that you're wearing the outside edge of the front tires rather hard. Getting more camber up front will kill the understeer and give a big boost to tire life.

Despite all the reviews saying the car is oversteer prone, a lot of people who track and autox this thing strongly disagree.

It is oversteer prone at low roll angles. It begins to push if you accelerate a bit early and especially if you are cornering as fast as possible on a dry surface.

In the wet, the rear axle is very unruly and the car is slow as a result. On snow or ice it can get ridiculously twitchy at the back.

The MCA traction aids help this a lot by reducing rear anti squat.

[Gforce]

Originally Posted by nikitopo

I also heard good news about the Sachs shocks. Keep in mind that some other parts have changed too. E.g., the front top mounts are new ones. Probably, because the front springs are much stiffer.



The throttle mapping software is like this on purpose. If you try a good throttle mapping device (without touching the ECU), you'll see that the engine wakes up. For sure it is more fun, but at the same time less stable and much slower. You don't gain anything by spinning your wheels or un-balancing the car in a corner. At least if you want to go fast ...

The PP on the 2017 has to be about the best option deal available on any car. You get a lot for not much money.

Sachs competes head to head with Bilstein in Europe and is fitted as OEM by more makers than Bilstein.

The torque dip hasn't gone away and can't be eliminated. It comes from the variable cam timing used by Subaru, developed for them by Porsche and Porsche engines have the same dip. The lower final drive fitted to the manual 2017 May mask the torque dip but it'll still be there. Even a Supercharger only masks the dip, gas flow is gas flow whether it gets sucked in or pumped in. Turbocharger maybe will overcome the torque dip because they boost differently from the air pump type Superchargers.

For example, here are the torque curves a Cosworth Eaton type supercharger gives you, compared to stock:

http://www.cosworth.com/media/452769...kage_Range.png

Edelbrock produces exactly the same pattern. Check out a Porsche Cayman flat six torque curve graph, looks identical.

Subaru clearly decided to build a more sophisticated version of the BRZ for 2017. The earlier cars were built primarily with driving excitement in mind. The new version is aimed at driving enjoyment, not quite the same thing. Depends how much you like oversteer.

[JSube]

Originally Posted by Gforce

The PP on the 2017 has to be about the best option deal available on any car. You get a lot for not much money.

Sachs competes head to head with Bilstein in Europe and is fitted as OEM by more makers than Bilstein.

The torque dip hasn't gone away and can't be eliminated. It comes from the variable cam timing used by Subaru, developed for them by Porsche and Porsche engines have the same dip. The lower final drive fitted to the manual 2017 May mask the torque dip but it'll still be there. Even a Supercharger only masks the dip, gas flow is gas flow whether it gets sucked in or pumped in. Turbocharger maybe will overcome the torque dip because they boost differently from the air pump type Superchargers.

For example, here are the torque curves a Cosworth Eaton type supercharger gives you, compared to stock:

http://www.cosworth.com/media/452769...kage_Range.png

Edelbrock produces exactly the same pattern. Check out a Porsche Cayman flat six torque curve graph, looks identical.

Subaru clearly decided to build a more sophisticated version of the BRZ for 2017. The earlier cars were built primarily with driving excitement in mind. The new version is aimed at driving enjoyment, not quite the same thing. Depends how much you like oversteer.

^^This is good stuff, GForce^^ It's been mentioned before that our cars have a kind of "VTEC effect", which the final drive accentuates, I think.

The tuner who did my STI for me (before I traded it for the PP BRZ) told me the BRZ torque dip can be reduced a bit by a tune on the oem parts but is ultimately a mechanical issue. He said the dip can largely be made irrelevant with ELH, exhaust and a tune- of course he recommended going right to E85 after the parts because he's a tuner

I can see myself pursuing that route next year, without flex fuel because of the MPG penalty. But I'm completely over inherently hot-running turbos and their complexity, also over the temptation to redesign perfectly good cars. I think my BRZ is actually a pretty great car, owned 3 months as a DD that's been to 2 track days with several more scheduled

[Gforce]

Originally Posted by JSube

^^This is good stuff, GForce^^ It's been mentioned before that our cars have a kind of "VTEC effect", which the final drive accentuates, I think.

The tuner who did my STI for me (before I traded it for the PP BRZ) told me the BRZ torque dip can be reduced a bit by a tune on the oem parts but is ultimately a mechanical issue. He said the dip can largely be made irrelevant with ELH, exhaust and a tune- of course he recommended going right to E85 after the parts because he's a tuner

I can see myself pursuing that route next year, without flex fuel because of the MPG penalty. But I'm completely over inherently hot-running turbos and their complexity, also over the temptation to redesign perfectly good cars. I think my BRZ is actually a pretty great car, owned 3 months as a DD that's been to 2 track days with several more scheduled

The beauty of adding the Eaton type Supercharger option is the engine isn't altered in character. Because it's just an air pump the supercharged engine behaves more or less like a 3.0 litre version.

Frankly, just deleting the intake noise generator from the stock engine reveals the true personality of this Subaru boxer. It is just as characterful and capable as any Porsche boxer engine.

[Tcoat]

Originally Posted by Gforce

The beauty of adding the Eaton type Supercharger option is the engine isn't altered in character. Because it's just an air pump the supercharged engine behaves more or less like a 3.0 litre version.

Frankly, just deleting the intake noise generator from the stock engine reveals the true personality of this Subaru boxer. It is just as characterful and capable as any Porsche boxer engine.

How does removing the noise generator chane anything?

[Tcoat]

Originally Posted by Gforce

The PP on the 2017 has to be about the best option deal available on any car. You get a lot for not much money.

Sachs competes head to head with Bilstein in Europe and is fitted as OEM by more makers than Bilstein.

The torque dip hasn't gone away and can't be eliminated. It comes from the variable cam timing used by Subaru, developed for them by Porsche and Porsche engines have the same dip. The lower final drive fitted to the manual 2017 May mask the torque dip but it'll still be there. Even a Supercharger only masks the dip, gas flow is gas flow whether it gets sucked in or pumped in. Turbocharger maybe will overcome the torque dip because they boost differently from the air pump type Superchargers.

For example, here are the torque curves a Cosworth Eaton type supercharger gives you, compared to stock:

http://www.cosworth.com/media/452769...kage_Range.png

Edelbrock produces exactly the same pattern. Check out a Porsche Cayman flat six torque curve graph, looks identical.

Subaru clearly decided to build a more sophisticated version of the BRZ for 2017. The earlier cars were built primarily with driving excitement in mind. The new version is aimed at driving enjoyment, not quite the same thing. Depends how much you like oversteer.

Porsche had nothing to do with developing the Subaru engine.

[Gforce]

Originally Posted by Tcoat

How does removing the noise generator chane anything?

Reduces unnecessary engine noise. Duh.

[Gforce]

Originally Posted by Tcoat

Porsche had nothing to do with developing the Subaru engine.

R u sure?

[Tcoat]

Originally Posted by Gforce

R u sure?

Yep. The design is similar but that is more due to the nature of the engine than Porshe being involved. There is a really good write up on the development of the Subaru engine that they put out a few years back. They specifically speak to the fact people frequently say Porsche was involved. I will see if I can dig it up.

[Tcoat]

Originally Posted by Gforce

Reduces unnecessary engine noise. Duh.

Can get the same noise reduction from plugging it. I hate that noise.

[nikitopo]

Originally Posted by Gforce

The beauty of adding the Eaton type Supercharger option is the engine isn't altered in character. Because it's just an air pump the supercharged engine behaves more or less like a 3.0 litre version.

Superchargers still require to be at a certain rotational speed until they are able to produce maximum boost.