Toyota 86 & Subaru BRZ News: The Drivetrain

 

Once again more interesting photos, from ft86club.com, about the Subaru BRZ & its sister the Toyota 86; this time detailed shots of the drivetrain.

The whole setup looks very simple, basic and easy to understand. While all other car-makers are taking the path of advancedw technology, Subaru & Toyota kept it simple and straight to the point. Once again the Japanese prove the point that you don’t need advanced and complex technology to smartly build something solid, successful & ‘affordable’.

This is the platform used on both the Toyota 86 and Subaru BRZ as they are exactly the same car with minor differences. Though the 2.0 boxer engine is coded as: 4U-GSE in the Toyota while in the Subaru is it: FA20. The manual tranmission is a 6 speed from Subaru while the Automatic transmission is actually the same one used on the Lexus IS-F minus 2 gears.

There is a concern when it comes to the direct-injection engine and the transmission; endless discussions on fan sites are questioning the tuning potential of the overall drivetrain and how much power output it can handle. Tuning businesses like HKS and Greddy are working as we speak on finding ways to make the best out of this high compression ratio engine. Most of the road friendly modified 86s and BRZs are have been featured so far with basic mods such as air-intakes, exhausts, suspension and brakes; we still wait to see how forced induction and high power output applications fit into this system.

 

 

Also, here is some translated information about the whole setup (this is a direct translation from Japanese):

Subaru (FHI), FR sport “BRZ” a small co-developed with Toyota Motor Corporation. Was also announced that the configuration is 3 and grade, “S” “R” “RA” to determine the release date on March 28.

The exterior and interior are introduced in the news and “see in the picture” already here, we want to introduce a mechanism for a little more deep.

 

■ Engine
“Said a low center of gravity” has it become a basic concept of BRZ. Its benefits along with the two points it is possible to reduce the role, that draw the full power of the tire. In other words, with or without hard suspension settings than necessary, or to install a high-grip tires, a translation can pursue handling performance.

However, it’s easy only if written as “low center of gravity” just, quite difficult when it comes to the actual form. If the BRZ, FA20 engine of adoption “D-4S and the next generation, horizontally opposed” is that its core. As you know, the main stream of the company have just handed over to the third generation from FB20 and if Subaru EJ20 fan. Say it has been positioned has been newly developed and FA20-only (so far) there is a dare, and the car is BRZ & 86 with the more important role.

FA20 is a big point of, and specially designed intake manifold (hereinafter, intake manifold) and exhaust manifold (hereinafter, the exhaust manifold), but the adoption of thin oil pan it. This will clarify the features of the high center of gravity horizontally-opposed engine is lower than the engine originally series. And has achieved a very low center of gravity height and 460mm, the minimum ground clearance of 130mm. Also to the rear center position of the engine at the same time. Is also offset to the rear 240mm compared to the new Impreza, on the axle of the front wheel was almost. Weight distribution when you are around the front seat and ride 2 53:47 This, you can enjoy the fun of unique and FR.

 

■ Transmission
There are two types of transmission and a 6-speed AT 6-speed MT. MT is a single cone synchro over triple-cone, a 4-speed to 6, in the range shift feeling daily rate has been increased from 1 to 3. AT is electronically controlled adaptive control was adopted. Adaptive control and determine what the road conditions and vehicle state from the accelerator opening, that control is performed in accordance with the intent of the driver. 3 provides a mode of “SPORT” “SNOW” “(manual) M”, has become a mechanism, such as running can enjoy according to the situation by changing the degree of control interventions, respectively.

It has become a royal road to select the MT given the run, there is only one problem. It should be turned to what was assumed 205Nm (20.9kgm) / 6400 ~ 6600rpm which is the current engine torque capacity of the transmission. Would have been taken from the factor of safety to some extent, it would not matter if a little about, such as response to the large torque 422Nm (43.0kgm) / 4400rpm Impreza WRX STI is it has not been assumed, for example. But that the drive train, otherwise the propeller shaft and drive shaft and differential, and there is enough space in the AT it.

However, there is no problem at all levels, even if it is about fine-tuned 6-speed MT. So there is a commensurate need to put hand to the engine if you plan to give more power and torque, there is a story about “Me and the brothers are also enhanced transmission if you do up there.” Paradoxically, it will also with a supercharger (MT vehicles) does not publish unless you solve this problem

 

■ Suspension
The same combination, such as front suspension Impreza / McPherson strut, rear and / Double wishbone. However, the details are quite different.

Strut front cross member and lower arm employs a new shape. Reverses the orientation of the front and rear lower arm, and become the front side mount position, significant changes have been made. In addition, the attention also to the coil spring. If the front, because the bottom is above the tire mount, spring rate patterns earn you reduce the number of generally larger diameter wound. But, placed inside the tire diameter in bottom mount suppressing the BRZ. He has achieved a sporty style reduces the height of the front hood.

Newly designed rear sub-frame. As well as to optimize the suspension geometry, which enables deployment of large-capacity def.

 

Notice in the picture below how the power-train unit is pushed as far as possible behind the front wheels and how the engine is actually, sitting low between the wheels. This is one way the car managed to maintain a 53:47 weight ratio along with its low center of gravity; these features make the 86 or BRZ handle as good as Porsche’s Boxster.

 

  

 

The boxer engine, as usual, will provide a cramped engine bay; some mechanics do not like that as this could also mean more hard work and removal of components in order to access others.

The pulleys are all driven by 1 belt (something that some other car-makers should start doing already), the alternator, A/C compressor and the oil filter are accessed from the top for maintenance, just like other Subaru engines. It just doesnt seem too complicated to comprehend. There is no mechanical power-steering pump as the steering system is electro-hydraulic.

Well, inside the engine bay can be a different story as this showcase is stripped out of all the hoses, wiring and other extras that will make matters a bit more tight.

 

            

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One thought on “Toyota 86 & Subaru BRZ News: The Drivetrain

  1. I might not have the top end oh the Gen coupe but take a look at the horsepower vs weihgt of this and the turbo 4 Gen coupe.GT-862700 lbs/200 hp =13.5 lbs/hpGen Coupe Turbo 43350 lbs/270 hp= 12.4 lbs/hpThey’re very close. I’d estimate each car to do 0-60 in a few ticks past six seconds. A car doesn’t need 400 hp to be fun. I think this car will be a very engaging driving experience but we’ll have to wait until we can get behind the wheel.And for all those wanting a turbo option I’m sure its coming. Wait until the WRX moves over to its new platform and gets its new motor. I’d say there’s a good chance that motor will find its way into this car.

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