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So I was reading the February issue of Sport Compact Car and ran across an article on the speed 3 and its engine. The engine section is the main part and is really interesting. It has helped me understand it much better, especially why it runs so rich. I highly suggest reading it especially if you're not too familiar with it.
 

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scan scan scan scan scan please
 

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So I was reading the February issue of Sport Compact Car and ran across an article on the speed 3 and its engine. The engine section is the main part and is really interesting. It has helped me understand it much better, especially why it runs so rich. I highly suggest reading it especially if you're not too familiar with it.
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Does it explain why they run a high comp. rate of 9.5/1. I am curious if it is due to the small turbo or ? You have to wonder what the performance would be like if it had a lower comp.
 

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Does it explain why they run a high comp. rate of 9.5/1. I am curious if it is due to the small turbo or ? You have to wonder what the performance would be like if it had a lower comp.
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If you ran lower compression you could more easily add a larger turbo for more ultimate power, but then the dreaded turbo lag of yore would be present. I much prefer this compromise.
 

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Higher comp is better for power. Thats how Honda/ Lexus squeezes so much power out of their engines. As for turbocharged cars, it is a technological breakthru to have a 9.5/1 comp in a turbocharged engine. However it'll be harder to tune for massive power.
 

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IF we had lower compression how would the power be? Worse.

Higher compression is always better. It's just less forgiving for tuning and things blow up.

The K20's are running 10 or 11:1 compression and they're boosting the shit out of their engines.
 

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Discussion Starter #8
The temps. in the engine are lower so it makes wear and tear less so they can run the engine at a higher ratio without causing more damage.
 

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it expalins that they keep the higher compression for the extra low end power then you add the small turbo that spools all the damn time for all kinds of torque. They also added that the biggest advantage is the fuel system the direct injection keeps the air charge cold becuase of the atomization of the fuel directly into the chambers.
 

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IF we had lower compression how would the power be? Worse.

Higher compression is always better. It's just less forgiving for tuning and things blow up.

The K20's are running 10 or 11:1 compression and they're boosting the shit out of their engines.
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The lower compression would be so you have the ability to run higher boost.

I would love to see someone running stock compression and more than 5-7 psi on one of those K20s. Even then if they are not running straight c-16 with massive pulling of the timing I would be suprised.
 

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well, I am glad the MS3 is getting attention and magazine excited, at least it'll trickle down to us.

BTW, you guys see the movie where they maxed out the MS3 on the autobahn?
 

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Nope. I want to see that video.
 

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With the direct injection you can run a higher compression and not detonate as easy as you would on a non direct injected vehicle with the same compression ratio. So we get better low end with the higher ratio, but it's still low enough to run 15+ psi.
 

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If I had the motor out, and parts were readily availible, I'd love my motor to have lower compression. I'd boost the shit out of it!!!!
 

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"A heavily modified turbo MZR engine, featuring a similar DISI design, powers current NHRA Sport Compact ProFWD Champion Ed Bergenholtz's 1400-plus hp Mazda6."

:shocked:
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Well I dont want 1400 just give me 1/4 of that and i would be pretty damn happy :)
 

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"A heavily modified turbo MZR engine, featuring a similar DISI design, powers current NHRA Sport Compact ProFWD Champion Ed Bergenholtz's 1400-plus hp Mazda6."

:shocked:
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theres 1000hp ecotec, K20. so what?? with enough money i can make my big wheel hit 9's.
 
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