Turbos making less power down low?

[usptwins]

Hell, i love the small low-end.... Its nice, as said before, for sneaking by anyone. This car was made to keep power up top...

[Coheed]

Originally Posted by chulooz

You are simply making things up, I challenge you to give me one RELIABLE source. And this is not a 'previous Toyota' engine... the car, as a piece of craftsmanship, is a Subaru.

Yahama involvement was nothing but an old-school rumor.

Do you have a source that says it is a subaru head, designed from the ground up from subaru? Perhaps you are right, but hey, the transmission and rear end are all Toyota parts. What's so hard to believe about the heads having some Toyota development?

The ports, lifters, rocker assembly, all scream Yamaha to me. Perhaps Subaru just took all their good design queues.

[jdzumwalt]

Yamaha has designed a lot of oem head for different manufactures. 3SGTE head for one, a very good Toyota head. Why would this be hard to be leave. This car is a hodge podge of different part's. I don't care who built what. The characteristic of the motor speak for it self. You can't reinvent the motor with a turbo period.


Secondly late boost on a high compression motor will save it from early torque detonation. This and good control over the direct injection timing.

I hope it's true because Yamaha gets it done.

[czar07]

Originally Posted by Guff

A stock TT Supra running sequentially might start spooling at 2k, but a big Single sure doesn't!

yeah yeah I know. I was referring to you saying that if a turbo spools under 3k, it would be jerky for daily driving.

[Guff]

Originally Posted by czar07

yeah yeah I know. I was referring to you saying that if a turbo spools under 3k, it would be jerky for daily driving.

I guess in that regard, you're right... Although, 1-3psi at 2-3k RPM is kinda insignificant as well.

If somebody make a turbo that made a bar of boost at 2k RPM, that would certainly be jerky in DDing. Although, I'm not sure that can even be done...

[Synack]

My tuner is working on power down low. Also the cams apparently are a bitch to tune and require extra hardware or software. Don't quote me on this.

Sent from my Galaxy Nexus

[EN2_Squirrel]

I do not like turbo lag. However i do not think that when i would use that turbo (autocross, track days) that i will be spending much, if any, time below 3k rpm. I have autocrossed the car and it is easy to keep above 3k rpm, even though it was a tight course.

[chulooz]

Originally Posted by jdzumwalt

Yamaha has designed a lot of oem head for different manufactures. 3SGTE head for one, a very good Toyota head. Why would this be hard to be leave. This car is a hodge podge of different part's. I don't care who built what. The characteristic of the motor speak for it self. You can't reinvent the motor with a turbo period.


Secondly late boost on a high compression motor will save it from early torque detonation. This and good control over the direct injection timing.

I hope it's true because Yamaha gets it done.

The FB20, the platform for the FA20 architecture, shares itself with the FA20 DIT which is a modified turbo platform of that similar engine. So indeed it can be done, and done well! 295tq 2000-4800rpm must be awesome.

Once again Yamaha has had nothing to do with this vehicle or its engine.

[serialk11r]

That's what I call "massive turbine restriction", not "great torque". There are better ways to get that kind of boost, namely supercharging. A turbo's strong point is its efficiency when it has a nice big free flowing turbine, aka not low end.

[chulooz]

Originally Posted by serialk11r

That's what I call "massive turbine restriction", not "great torque". There are better ways to get that kind of boost, namely supercharging. A turbo's strong point is its efficiency when it has a nice big free flowing turbine, aka not low end.

If ~300tq by 2k isn't 'great torque' than what does that make the 151tq from the FA20?

Turbine restriction?

[serialk11r]

Originally Posted by chulooz

If ~300tq by 2k isn't 'great torque' than what does that make the 151tq from the FA20?

Turbine restriction?

It's great torque thanks to great turbine restriction. Well, at 2k that engine is doing okay, but that flat line is because the wastegate is blowing off a massive amount of pressure to prevent the engine from blowing up. Aka, wasting a lot of power. At that point, a supercharger is the more sound option, although I do admit that they're a little more difficult to design.

I guess the appeal of a turbo is that you only need to worry about plumbing and you can control the boost pretty easily, but take transient response into account and it makes very little sense the way most turbo setups are done. Sure, they get the job done, but not in the best way.

[chulooz]

Originally Posted by serialk11r

It's great torque thanks to great turbine restriction. Well, at 2k that engine is doing okay, but that flat line is because the wastegate is blowing off a massive amount of pressure to prevent the engine from blowing up. Aka, wasting a lot of power. At that point, a supercharger is the more sound option, although I do admit that they're a little more difficult to design.

I guess the appeal of a turbo is that you only need to worry about plumbing and you can control the boost pretty easily, but take transient response into account and it makes very little sense the way most turbo setups are done. Sure, they get the job done, but not in the best way.

I suppose 'the best' is relative to the user and plans... its a lot more fun swapping tunes compared to pulleys; and the aftermarket/OEM support for these turbo systems keeps most of it reliable/predictable.

[serialk11r]

Originally Posted by chulooz

I suppose 'the best' is relative to the user and plans... its a lot more fun swapping tunes compared to pulleys; and the aftermarket/OEM support for these turbo systems keeps most of it reliable/predictable.

Yea, that's what I was referring to, a turbo kit's behavior can be modified by valves and programming, and that's certainly a good thing for the hobbyist, but in a lot of cases a supercharger would provide closer to ideal performance characteristics.