[Homemade WRX]

Originally Posted by Gardus

The key is the revs...the 86 engine will never revs to 10k, even more than 8k will be probably dangerous.
The S2000 revs to 9200 to get 240 hp after all.
The Ariel engine is basically a race engine and by itself costs more than 2 whole 86s!
Please be realistic.

Coming from someone who's been building Subie race engines that tach up to 10k, I wouldn't go out making. I however wouldn't bother building this engine NA if I wanted to make big power.

Originally Posted by Gardus

I don't think it's so easy. Modern ECU on NA cars have target (perfect) A/F ratio and advance spark. If the conditions are right (fuel, temperatures, weather, air density...) the car can reach the target and make the most power.
With just an ECU remap you can't make the car magically reach that "sweet spot".

There is always some left on the table. How much exactly will have to be seen.

...with cars with DBW throttle limited electronically...

often come with lots of areas in the map were the throttle open angle is capped for means of good emissions testing. Stateside, we can thank the FTP for such limitations. In Europe, you know it as the ETC.

There's no way to increase the efficiency % without any mechanical modifications, you're limited by the law of physics. Car manifacturer engineer are not stupid, you know...they know much more about the car than any aftermarket tuner.

well that a bit of an unfair statement as I'm both though I largely only tune my personal cars and I stick to the engineering. Not worth dealing with the customer related headache.
Oh and you can increase efficiency without mechanical modifications. You are forgetting you are comparing a car that is heavily scrutinized from the manufacturer for emissions compliance. Emissions testing in the real world is MUCH more slack. Now I'm anxious to see how they do the fueling strategy on this particular car with the port and GDI injectors. Just another perk of GDI is your volumetric efficiency increases if only running GDI. Then you have the usual timing to play with but now also injector timing too.

Originally Posted by Gardus

You make it seems SO easy.
It isn't. NA engine with 100 hp/l are already close to the limits, the only way to make this engine push more than 220 hp is to get the rev limiter past 8k rpm, change the cams (4 of them-->costly!), a full exhaust etc

I'll somewhat agree with this point. I suspect the stock longblock will be relatively capped...thank you emissions.

I already have an employee who's planning to grab the BRZ and friend getting the FRS. One will get a simple NA and the other will get a cute little centrifugal supercharger. I'll wait and grab the factory turbo so that the trifecta is covered.