Comparison to the MX-5 Engine

[Chemist]

Well, I didn't know this before but the current engine in the MX-5 is a 2.0 L direct injected 4 cylinder engine. The MX-5 is also found in a RWD configuration. Therefore, this seems like an ideal comparison to the upcoming FT-86 engine.

The specs for the MX-5 engine and vehicle performance:

167 hp @ 7000 RPM (Redline = 7200 RPM)
140 ft-lbs of torque @ 5000 RPM
10.8:1 CR
Bore x stroke (mm) = 87.5 x 83.1
Displacement = 2.0L

Curb weight = 2511 pounds
0-60 according to Car & Driver = 6.7 sec (MT est)

Base Price $23,560-$30,100

Geez, I think the FT-86 is starting to sound like a hardtop MX-5 with a backseat.

I wonder what kind of tricks can be pulled off to make this thing unique. Higher rev limit? Aggressive tuning? Low weight? Higher CR? Of course, we know none of these things for the FT-86 so I'm just adding to the speculation. I'd like to think the FT-86 will come with a baseline of 200 hp, but how?

[Dimman]

Originally Posted by Chemist

Well, I didn't know this before but the current engine in the MX-5 is a 2.0 L direct injected 4 cylinder engine. The MX-5 is also found in a RWD configuration. Therefore, this seems like an ideal comparison to the upcoming FT-86 engine.

The specs for the MX-5 engine and vehicle performance:

167 hp @ 7000 RPM (Redline = 7200 RPM)
140 ft-lbs of torque @ 5000 RPM
10.8:1 CR
Bore x stroke (mm) = 87.5 x 83.1
Displacement = 2.0L

Curb weight = 2511 pounds
0-60 according to Car & Driver = 6.7 sec (MT est)

Base Price $23,560-$30,100

Geez, I think the FT-86 is starting to sound like a hardtop MX-5 with a backseat.

I wonder what kind of tricks can be pulled off to make this thing unique. Higher rev limit? Aggressive tuning? Low weight? Higher CR? Of course, we know none of these things for the FT-86 so I'm just adding to the speculation. I'd like to think the FT-86 will come with a baseline of 200 hp, but how?

Well if it's going to be an EJ motor, it will have a larger bore and shorter stroke, as well as be better balanced. These can lead to a few things. Bigger bore means bigger valves can be stuffed in and potentially more flow per cylinder. Short stroke and balance means it can rev out better to spin the motor to take advantage of the potentially increased flow. The problem with going for max flow at high engine speeds (max NA power) means poor low-speed cylinder filling, but this can be addressed with tech like cam phasing and variable valve lifting systems. Also variable length intake systems like Toyota's old TVIS and resonance tuning like Toyota's ACIS can modify the powerband. Plus the direct injection will allow for more efficient combustion which can either make more power same fuel use or same power less fuel use.

200 hp will be a piece of cake, but it will depend on what they decide for trade-offs between power, economy, driveability and reliability.

[Siriusly.Andrew]

Originally Posted by Dimman

200 hp should be a piece of cake, but it will depend on what they decide for trade-offs between power, economy, driveability and reliability.

Fixed.

EDIT : I may end up retracting this statement. Its very likely I'll be retracting this statement lol.

[Matador]

Originally Posted by Dimman

200 hp will be a piece of cake, but it will depend on what they decide for trade-offs between power, economy, driveability and reliability.

This.

[Siriusly.Andrew]

and those are the main reasons why I'll be retracting my previous statement hah. It really will boil down to what Toyota wants from the engine. In the end, I don't think it'd be to hard to make more power with this engine, if they decided to go with less power / better economy.

[Dimman]

I think it will be 100hp/L just so people won't have to listen to Honda owners yammer about their motors getting better power to displacement than the new Toyota. (no offense to S2000 owners, 120/L kicked ass)

[Mouse]

One thing I can say about the NC engine, after I added a Fujita intake and removed the muffler and replaced it with 2.5" straight pipe. The car pulled really hard which I would attribute to the torque of the motor. I can't explain how it felt exactly but it felt similar to when a turbo car gets into it's power band. There are dynos of NCs with intake, headers, full exhaust, and tuning(via snipertune software) making 170-180hp to the wheels. Plus there is quite a bit of parts from cosworth.

[Abflug]

didn´t know that cosworth upgrades NC´s!

[Dimman]

Originally Posted by Mouse

One thing I can say about the NC engine, after I added a Fujita intake and removed the muffler and replaced it with 2.5" straight pipe. The car pulled really hard which I would attribute to the torque of the motor. I can't explain how it felt exactly but it felt similar to when a turbo car gets into it's power band. There are dynos of NCs with intake, headers, full exhaust, and tuning(via snipertune software) making 170-180hp to the wheels. Plus there is quite a bit of parts from cosworth.

Err... really? Intake and muffler (not even full exhaust) makes it feel like boost is kicking in?

What is your turbo car experience?

[djohnson]

Don't forget, this car is getting dual injection systems... direct and port for different rev ranges

[Mouse]

Ive' driven an passat(2002),wrx, sti, mazdaspeed 3, and a mazdaspeed miata. I don't know how to explain it.