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Discussion Starter #1
A tuning shop put an older version of the 1KR-FE in a 451. Both engines are 1000cc -3cyl built by daihatsu. Older engine was from... G100-cb70/80
There is a more modern turbo version of the 1000cc daihatsu engine .
So, has anyone tried the 1kr-fe or comparable engine in their 451? This engine came in the yaris and iq
 

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The 1KR-FE (Toyota/Daihatsu) and the Smart's 3B21 (Mitsubishi) Are basically competing engines from two different manufacturers. Their output seems similar, and Smart does have a turbo version of the 3B engine. I don't really see any advantage to do the swap.
 

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Discussion Starter #3
-Tuning shop sticks a turboed engine(1000cc) that puts out 200hp with some effort into a 451 several years ago. From my research, it can only be pushed to 280hp. 80's-90's engine design.
-Has anyone put a 1kr-fe into the 451? Someone has put a 1.5L from the yaris into the 451 and this engine was in the yaris as well as the IQ. Should be an easier install and a turbo on the 1.0L would surpass the n/a 1.5L.
- There is a turbo version of the toy/dai 1000cc if by any chance the 1kr has a limited hp limit.

As my response to the comment........ Even if you could get 200hp from the 451 engine, you would still be limited by the transmission lag. Have we even hit 150hp from either the 451 or 453?
 

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I can't fathom that any of the 1L 3 cylinder engines are making 200+HP with stock internals. You are going to spend $5-10k to end up with a highly stressed little engine. You will also have to deal with clutches/transmissions as none of them were designed to handle the power you think you need. For $10k you could swap in a Busa engine a make a reliable 200+HP.

Is the OP thinking of building a drag car or do they want to use their car on the street?
 

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-Tuning shop sticks a turboed engine(1000cc) that puts out 200hp with some effort into a 451 several years ago. From my research, it can only be pushed to 280hp. 80's-90's engine design.
-Has anyone put a 1kr-fe into the 451? Someone has put a 1.5L from the yaris into the 451 and this engine was in the yaris as well as the IQ. Should be an easier install and a turbo on the 1.0L would surpass the n/a 1.5L.
- There is a turbo version of the toy/dai 1000cc if by any chance the 1kr has a limited hp limit.

As my response to the comment........ Even if you could get 200hp from the 451 engine, you would still be limited by the transmission lag. Have we even hit 150hp from either the 451 or 453?
There have been stock bottom end 451's that come close to 200hp, through the use of aftermarket turbo kits. One former member here had a cow-colored smart that he claimed was getting close to 300hp, but he was having to do some extensive internal modifications to the engine. I'm not sure he made it before he gave up.

As Huronlad stated, any small form factor transmission and clutch is going to have durability issues as well at that level.

The transmission lag is largely due to the time it takes for the engine to change speed. The electronics and actuators can move very quickly, if allowed. You can go with a lightened flywheel to increase shift times, but even those get expensive very quick.

Believe it or not, these drivetrains have been around for a long time, and pretty much anything that can be done, has. The 3B21, and 1KR-FE are high-stress, economy engines. They were just never intended to operate much past their design limits.
 

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Discussion Starter #7
In case i was not clear without sounding rude.
-A tuner took an engine out of a car that owners of the car are getting 180-200hp without pulling the engine. So, the engine is getting 180+ on stock bottom end. I have heard something like 280 was the most someone has pushed the engine. Yea, the engine comes from the factory with a turbo and makes 120hp
-Yea, someone stuck a 1.5L from a yaris in the 451. A 1kr-fe is also in a yaris. My train of thought is the 1kr-fe would be an easier install. You would need to turbo it.
 

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What is the cost to build a 180+ HP 1kr-fe and install in a smart? Could you just buy a Hayabusa kit for similar money. Trying to reinvent the wheel at the cost of reliability, makes no sense to me.

I for one would be interested in reading some of those builds, especially if they have data backing their claims. A quick search of Google does not provide any examples of that engine making 180+ hp.
 
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