Speaking of the Tau engine...

[Aquineas]

There is apparently a "book" out on it (them):

http://www.barnesandnoble.com/w/hyundai-tau-engine-jesse-russell/1113221167

I'm very skeptical however of any book that has "High quality content by Wikipedia articles" in its book overview, however, especially considering the Wikipedia Tau Engine article had the bore and stroke backwards (now fixed, btw).

The book overview also incorrectly lists the engine displacement as 305, when it's really a 307. Nevertheless, it's 154 pages, so I can't imagine that that's solely Wikipedia content.

In any case, I had a $25 Barnes and Noble gift card from a couple of years ago, so I bit the bullet. I definitely have a bad feeling about the content, though I hope I'm not wrong. I'll post a review when I receive it. I don't have high expectations, but I'm essentially getting it for "free", so we'll see.

 

[NSXNEXT]

High Quality Content by WIKIPEDIA articles!

Seems like an oxymoron to me.

Let us know what you think.

 

[Jbo]

More like a non- secquitor to me!

 

[LIRspecSedan]

i would be interested in hearing about the factory supercharged engine chapter

 

[Aquineas]

My goodness this book just about as bad as I thought it would be. It's awful! It really is Wikipedia articles, and yes, a few of them are on the Tau, but most of it is on things like Hyundai, history of Hyundai engines, Japanese V8 engines, etc.

 

[Jbo]

A fool and ........ We got fooled not!

 

[acoga]

Make sure to leave a review on the B&N.com site so other people don't get suckered into paying for the book!

 

[Mark_888]

Make sure to leave a review on the B&N.com site so other people don't get suckered into paying for the book!

No one should get suckered into buying a book (computer generated) that is based on "High quality content by Wikipedia articles."

 

[Aquineas]

No one should get suckered into buying a book (computer generated) that is based on "High quality content by Wikipedia articles."

oh yee perfect and exalted one, I cower in your omnipotence and clear air of superiority

 

[TheBeginning]

Can someone explain how the engine adjusts the tuning (timing) for 87 vs 91 octane?

I don’t think it has anything similar to a flex fuel sensor, and I can’t imagine a guess and check with knock sensors would be too sustainable.

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[Gunkk]

Can someone explain how the engine adjusts the tuning (timing) for 87 vs 91 octane?

I don’t think it has anything similar to a flex fuel sensor, and I can’t imagine a guess and check with knock sensors would be too sustainable.

1. ECU advances spark timing slowly over time.
2. Is it knocking? Yes, retards timing a little until it stops knocking. No, go to step 1.

Higher octanes will run with more timing, giving slightly better performance (and depending on your right foot: fuel economy). If you have real-time telemetry capability via an OBD2 dongle, you can watch the timing real time (I use a $20 cheapo and Torque Pro app).

 

[TheBeginning]

1. ECU advances spark timing slowly over time.
2. Is it knocking? Yes, retards timing a little until it stops knocking. No, go to step 1.

Higher octanes will run with more timing, giving slightly better performance (and depending on your right foot: fuel economy). If you have real-time telemetry capability via an OBD2 dongle, you can watch the timing real time (I use a $20 cheapo and Torque Pro app).

I could be wrong, but isn’t knock horrible for the engine? So the ecu causes knock regularly to determine timing?

 

[Gunkk]

That horrible engine destroying "knock monster" you're thinking about is what a lot of folks traditionally call "dieseling" or bogging the engine at low RPM and light-to-moderate loads. And yeah that's bad juju. But that's not what's going on here.

Pre-detonation comes in many forms, 99.9% of which you cannot perceive from the passenger cabin because the ECU (via knock sensors) catches and corrects timing before it can get so bad that you can actually hear and feel it. Happens all the time in all modern cars. Many modern GDI performance engines (particularly boosted ones) benefit significantly from octane to reduce knock-retard. Cars with flex sensors do this by directly measuring the fuel and selecting the appropriate timing table(s) to control spark, and they use KR as a backup. What Hyundai did with the Genesis is take advantage of how the Tau responds to the extra octane (knock resistance) of the fuel to get a couple percent more performance out of what is already an incredibly efficient engine (specific power output).

Most folks have to void their warranties to get a "tune" to improve performance. We got it for free

 

[TheBeginning]

That horrible engine destroying "knock monster" you're thinking about is what a lot of folks traditionally call "dieseling" or bogging the engine at low RPM and light-to-moderate loads. And yeah that's bad juju. But that's not what's going on here.

Pre-detonation comes in many forms, 99.9% of which you cannot perceive from the passenger cabin because the ECU (via knock sensors) catches and corrects timing before it can get so bad that you can actually hear and feel it. Happens all the time in all modern cars. Many modern GDI performance engines (particularly boosted ones) benefit significantly from octane to reduce knock-retard. Cars with flex sensors do this by directly measuring the fuel and selecting the appropriate timing table(s) to control spark, and they use KR as a backup. What Hyundai did with the Genesis is take advantage of how the Tau responds to the extra octane (knock resistance) of the fuel to get a couple percent more performance out of what is already an incredibly efficient engine (specific power output).

Most folks have to void their warranties to get a "tune" to improve performance. We got it for free

Thanks for the write up. Makes sense. Not sure about anyone else, but my butt dyno definitely notices the timing adjustments.