Originally Posted By: OVERK1LL
Originally Posted By: sciphi
Originally Posted By: hattaresguy
I'm more familiar with diesels but to get more HP out of a gas engine with a turbo you need to crank up the boost. Now that's a bit of a tricky proposition if you want the engine to last for awhile. The question now becomes how much boost can you run in this motor before something pops? Does anyone know yet?
Also why bother its an economy car?
The stock turbo is good for at least 22 PSI. The stock injectors are maxed out at 22 PSI. One would need larger injectors to find the limits of the stock turbo. Tuning houses with experience with the LNF in the Cobalt SS/Solstice GXP are all over the LUJ finding its limits. So far, those limits are looking pretty high. The professional tuners are reporting 180 whp and 240 ft/lbs with larger injectors, E85, and a very aggressive tune. There are daily-driver tunes with 150 whp and 190 ft/lbs at the wheels on tap, and those are thought of as conservative gains from the 116 whp and 140 ft/lbs of stock.
The trick to long life in this engine is looking like keeping the turbo and its hardware happy. It's programmed to use most of its stock capacity of 16 PSI most of the time from the factory. The most popular aftermarket tune on the Cruze boards has a setting that defaults to the stock boost limit, and needs the driver to engage the more aggressive programming.
PLEASE don't take this the wrong way, but I question the logic of running larger injectors, E85 and an aggressive tune to make the same power as a 5.0L from 1987 (and less torque).
It just strikes me as a ludicrous waste of money! The car is obviously an economy car. If the "upper limits" are the power levels of a high 13/low 14-second car from 1987, I really don't see that as something that makes sense. The shorter engine life, wear on the turbo and all the associated components.....
But maybe I'm missing something? And if that is so, please explain it to me
I agree. *IF* the turbo is "good" (ie be reliable in my book) for 22 PSI then it would be there from the factory.
As much as I'm no longer a GM fan they prob know a LOT more about their equipment than any one else. They HAVE destroyed more motors than aftermarket did getting to a SAFE LIMIT for the engine. If they could get 160hp out of it they would have.
But they have to be on the hook for 100k (or something else happens to them) so they will make it competitive for the segment and yet last.
I'll never forget when I was at my Ford dealership getting my Taurus worked on for its head gaskets @ 61k they had a turbo off one of their customers trucks and you could spin the impeller and feel how loose (side to side) and the impellers rubbed onto the side of the housing. It was out of blown engine which had been chipped then taken back to stock. They knew it and denied the warranty.
There was also a sign that said "chipped engine for a safe upgrade of power cost this customer a new engine when in warranty. Don't let this be you!"
Buy the vehicle for what it is. Don't try to make a Corvette out of a Cruze.
Take care, Bill