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Discussion Starter · #1 · (Edited)
As it's based on the 2016 Mazda2, you can expect the same 1.5-Liter Four-Cylinder engine to find its way into the iA.

With up to around 100HP-120HP, offered with a six-speed manual transmission, it should be a powerplant ideal for the iA, hopefully not lacking refinement and having dull throttle responses.
 

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Discussion Starter · #2 ·
CONFIRMED: Mazda's 1.5-liter engine is what the iA will get. It's said to be a quick revving, high-compression engine pushing 106hp.

Scion reports it to be a "high-spirited" engine.
 

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I've been looking all over for more information on this engine to find out how similar it is to the Mazda2 (Demio) 1.5L. What I learned is there are a few differences.

Since USA uses different octane ratings and 87 octane is slightly lower than other countries, the scion iA uses 11:1 compression ratio instead of 12:1 in Japan, Europe, and some other markets. This represents a 2-3% power, torque, and fuel efficiency reduction.

The iA does not use the same 4-2-1 header as the Japanese demio, I believe it uses a 4-1 header instead. Although I haven't been able to find verifiable data to back this up. 4-1 is more compact, allowing for more interior volume since the firewall can be pushed forward and lower by a few inches. The difference is that 4-2-1 allows exhaust heat to leave the cylinder head much faster which is one other reason for the 11:1 compression ratio. But by using the 4-1 design it allows Scion to increase rear passenger room by 2" or more.

The last thing I have found is that the engine uses the Miller cycle, which is used to mimic the Atkinson cycle during idle and low load operating conditions. When the engine operates in high loads it will use a traditional Otto cycle for extra power.

If anyone knows more about the iA engine please let me know because I am really curious to see what exactly is changed. It definitely explains why the iA only makes 106hp and 103 torque compared to the Demio's 115hp and 109 torque.
 

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So are you saying that the iA uses the same engine as the Mazda2 but there have been tuning tweaks to it? Are we getting more power or less? Or is it just where that power is in the RPM?
 

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Discussion Starter · #5 ·
So are you saying that the iA uses the same engine as the Mazda2 but there have been tuning tweaks to it? Are we getting more power or less? Or is it just where that power is in the RPM?
For one the change in transmission is giving it a boost.
 

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It looks like scion is keeping all the things that make the engine a skyactiv, but compromising where it isn't really needed in order to give us a better overall car. I'm currently working on enhancing the image from the influencer event so that I can read the board next to the iA. It has some more info on the car.
 

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So are you saying that the iA uses the same engine as the Mazda2 but there have been tuning tweaks to it? Are we getting more power or less? Or is it just where that power is in the RPM?
The power and torque band has shifted a little. I wouldn't be concerned, the transmission gearing more than makes up for this fact. The car should hit 0-60 under 9 seconds for sure.
 

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I found the complete spec sheet so I can retract one of my previous statements. It does in fact have 12:1 compression ratio, which is great!

Also looking at the ratio spread on the transmissions the manual will be a little faster than the automatic, but the automatic will get better mpg in every gear. Not much though, maybe 2 or 3.

http://pressroom.scion.com/releases/2016+scion+ia+product+specs.download
Whats nice about the manual is that you'll be able to drop a gear on demand to pass, where as the autobox you'll need to plan the move slightly in advance...
 

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Whats nice about the manual is that you'll be able to drop a gear on demand to pass, where as the autobox you'll need to plan the move slightly in advance...
The manual has definite advantages when it comes to merging and passing. But it's nice to have the automatic if you live in a busy city.
 

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The manual has definite advantages when it comes to merging and passing. But it's nice to have the automatic if you live in a busy city.
The greater range of control, being able to downshift to pass especially when you know you have a short time frame to work with to merge over does help but i'll have to test this automatic for myself, i'm hopeful it'll be sufficient, on paper that seems to be the case.
 

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Does anyone know the difference between this 1.5L Skyactive-G thats in our car, and the 1.5L in the Japanese MX-5 Miata? I see that the redline is a bit higher and the max power on the Miata is 1000 RPMs higher... Both engines are Skyactiv-G with 12:1 compression but the Miata 1.5L is rated at 129hp and 111 lbs or torque.... Just curious.
 

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The difference in power could be due to different intakes and exhaust manifolds, fuel injectors and tuning. The Scion iA engine is tuned for fuel economy and not power output.
 

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The difference in power could be due to different intakes and exhaust manifolds, fuel injectors and tuning. The Scion iA engine is tuned for fuel economy and not power output.
Yeah, thats kind of what I am getting at. I'd love to know WHERE the difference lies (whether it is in intake, exhaust, tuning, cams, etc - or all of the above). It seems the redline is lower on the iA than the MX5, so I believe that is PART of the difference.... guess i am just waiting until we can get a good look at what is different.
 

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I'm getting a ov tune here soon, so im going to do a factory pass, then tuned pass
 
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