I have watched a couple of races on tv that feature the Ford Focus, Hyundai Accent type cars and they have mentioned that the 4 cylinders in the cars produce about 600 hp. Does anyone know what they have done to the motors and whether or not some of the mods would be suitable for a street car?

They built all out turbocharged racing engines.

Same thing has been done with other small engines as well. Some of the mods probably are not suitable for the street. Those engines are built to be running at high RPM for several hours straight.

There are plenty of turbocharged Ecotecs in GM cars running around on the street though. Lots of 300-400 HP Solstice/Sky/Coblat/etc… with the stock LNF (which is already turbocharged from OEM) and only mild changes like air filter and a tune, maybe cat-back exhaust.

Here is your 400hp 4cyl This is why it is not streetable. Start the video at 5:10 and listen to how difficult it is just to keep the thing idling:

https://www.youtube.com/wat...JYmkZAQHWllfltu-pSZA

Awesome video, thanks for sharing

If you would like to make some decent safe power in a 4 cylinder get the GM Performance book on the Ecotec.

This engine can easily make up to 500 reliable HP that can be street driven. Note GM has had several show Solstice with this and the pro drift champion that Rys Millin drove an entire season with no break downs or rebuilds.

I drive a Ecotec daily with 23 PSI of boost and 300 HP with 315 FT LBS. the torque is limited due to the FWD transaxle. If not for that it could easily do 340 FT LN as in the Solstice.

I only have a GM turbo upgrade with 2 3 bar maps and a flash. You can get up to 400 HP and only make a few changes to reach 500 HP like rods and pistons with a more aggressive cam and bigger turbo.

Here is just one example and there are more on the web.

http://www.solsticeforum.co...uild-complete-69273/

Start here and the second book is the best.

http://www.summitracing.com...eyword=ecotec%20book