Chevy Cruze Eco

[RH77]

Someone will have to back me up on this, but "Zero-Pressure Boost" can help the engine with volumetric efficiency at cruise and assist with pumping losses, increasing FE. The question becomes how much energy does it require to spool the turbine to achieve this situation...

Have fun with that new SGII software!

-RH77

[99LeCouch]

I have more playing around to do with TPS values since they're a little wonky. It could be this engine uses its DBW throttle to go without an IAC, and keeps the throttle partway open at all times.

It would seem not to take much energy to spool the turbo at cruising speeds. It's a low-power turbo designed to provide power over a wide RPM range, not a high-RPM screamer. It definitely would help with VE since it's still forcing some air into the cylinders. Yeah, it's not actively providing more air. It's still providing more air than a NA engine would have at that RPM.

[Fr3AkAzOiD]

Could you get any pics of the aero bits under the car and around the wheels?

[cfg83]

Fr3AkAzOiD -

Originally Posted by Fr3AkAzOiD

Could you get any pics of the aero bits under the car and around the wheels?

+1!

CarloSW2

[99LeCouch]

Ask, and ye shall receive...

Apologies about the quality.

Front shutter system backside:



Front wheel airdam:



Engine bay undertray:





Underbody tray on driver's side:



Passenger underbody tray. Note front jack point on top of picture:





Rear wheel airdam:



Very dirty rear end:



Looking forward from the rear of the car. Yes, that is the front bumper laying on the ground being modded:



It's okay on the underside for OEM. It still could use some improvement, especially under the rear of the car where nothing was done.

[ncs]

Ideally, you should run as much boost as possible before the A/F ratio starts going rich. I'm tuned to start going rich at 3psi. It'd be really interesting to see what your more modern engine can do.

It doesn't look like there's enough room, but if you can, put a turbo blanket on, and wrap any unshielded exhaust parts. I went from a factory heat shield, to a blanket + heat shield and it mad a huge difference in under hood temp.

[gone-ot]

...FYI the Garrett Model MGT1446MZGL (GM # 55565353) turbocharger unit actually bolts "into" the exhaust manifold, and thus is additionally "cooled" via circulating engine coolant.

...illustration:
http://parts.nalleygmc.com/images/pa...071P03-004.JPG

[99LeCouch]

First tanks: 40 mpg and 42 mpg. Those were on 87 octane. I'm presently trying 93 octane to see if it has a positive effect on fuel economy.

I also got an oil pan heater that's going on shortly. That'll help out some in the winter.

[gone-ot]

...believe it or not, but using that oil pan heater religiously will ensure the engine oil is already "warm" for a much quicker engine warm-up time and resulting in better fuel economy.

...just don't FORGET TO UN-PLUG it before you drive off!!!!

[99LeCouch]

Don't worry, I'll make sure! My car's the first in/last out every morning, so there's lots of time to trip over the cord walking out to it!

I also ordered some Nokian R snow tires. They claim LRR and fantastic grip. We'll see.