: Reduced new engine power during breakin period?



snopro
12-14-06, 02:12 PM
I have read of ECMs using the hour meter and or odometer as part of the ECM's measurment of engine usage to control engine and trans performance(spark advance, fuel delivery, rpm, shift points, etc)to limit power (engine loading) during a pre-defined breakin period.

What I am interested in is what types of control does Caddy use on their engines for this purpose, how much does it reduce engine output, how long (hours and or miles) is the control active and does it deactivate gradually or at a set point?

mtflight
12-14-06, 02:50 PM
I have read of ECMs using the hour meter and or odometer as part of the ECM's measurment of engine usage to control engine and trans performance(spark advance, fuel delivery, rpm, shift points, etc)to limit power (engine loading) during a pre-defined breakin period.

What I am interested in is what types of control does Caddy use on their engines for this purpose, how much does it reduce engine output, how long (hours and or miles) is the control active and does it deactivate gradually or at a set point?

From what I've read on here, there is not much done for engine breakin. The car's are run for 15 minutes or so. The tolerances are so small that the long breakin process is a thing of the past.

The most important things are to properly bed the brakes. Driving fast during the brake breakin period is not recommended because it could result in deposits that harm the rotors and cause an uneven wear and inefficient braking power.

Look this up in the STS and STSV XLRV sections... that's where I read it.

snopro
12-14-06, 03:39 PM
That is the beauty of the ECM doing it for us.....there is no owner/driver consideration required.........the manufacturer presets the breakin maximum engine conditions and the ECM uses this programing until a certain hours or miles of operation is reached....floor it and you get 280 hp instead of 320...maybe you notice, maybe not....either way once the ECM can then go to its normal operation and rated performance outputs without fear of poor breakin by the operator driver damaging the engine.....I have driven vehicles where there is a night and day performance difference between 200 miles and 4000 miles...

....I am just curious how its done by Caddy, how much is it reduced, and at what point should we be at normal rated operation.

Anybody with some engine programing experience out there?

eldorado1
12-14-06, 04:12 PM
There is nothing acting as you describe on a cadillac. What would be the benefit?

mtflight
12-14-06, 05:09 PM
There is a rev limiter when the transaxle is in P. It won't allow drop-shifting from neutral, and the PCM will cut back torque when necessary (as part of traction control). I haven't heard of anything special during engine break-in.

Ranger
12-14-06, 05:20 PM
I have never heard of anything like that.

dp102288
12-14-06, 08:44 PM
^^ Me either, would be a good idea though...

eldorado1
12-14-06, 08:46 PM
^^ Me either, would be a good idea though...

again, what would be the point?

caddydaddy
12-14-06, 09:28 PM
So you don't drag race off the dealer lot? LOL, I don't know!

dp102288
12-15-06, 06:17 PM
Oh I think it would be good to ensure a good break-in. The engine would try to stop any potential damage to itself by the driver.

I guess that way some problems (like rings not setting well) could be lessened.

eldorado1
12-15-06, 11:30 PM
You need to vary the RPM for proper break in. According to several GM break in procedures, you NEED to do some wide open throttle runs.

http://books.google.com/books?id=XGxGDLjSj7AC&pg=PA186&lpg=PA186&dq=chevy+engine+break+in+procedure&source=web&ots=S0cV0VinEM&sig=gyq-M8BPkUT0KoaMUFdxTxc74EM

-Drive with varying speeds and loads (typical city driving) for 30 miles
-5 or 6 medium throttle runs
-5 or 6 wide open throttle runs

dkozloski
12-16-06, 12:00 AM
My new CTS had 30 miles showing on it when I took delivery. I drove it home 360 miles like I stole it. It's run perfectly ever since. Using the OLM it averages about 11,000 miles between oil changes and I've never had to add a drop. Break-in is a non-issue in my opinion.

dp102288
12-16-06, 08:36 AM
^^ @ the previous 2: Wow...I didn't know it was called for to WOT it! Guess reduced power would mess things up more then.

stevebuick23
12-16-06, 09:04 AM
My new CTS had 30 miles showing on it when I took delivery. I drove it home 360 miles like I stole it. It's run perfectly ever since. Using the OLM it averages about 11,000 miles between oil changes and I've never had to add a drop. Break-in is a non-issue in my opinion.

11,000 miles between oil changes? C'mon....

dkozloski
12-16-06, 11:32 AM
11,000 miles between oil changes? C'mon....
Read up on the OLM system in the technical section of the forum. This system was developed as a BS eliminator by GM and they stand behind it 100%. You can't argue with success. The OLM for the transmission works the same way.

dkozloski
12-16-06, 03:29 PM
11,000 miles between oil changes? C'mon....
I went back and checked my records, found one more oil change, and factored in the 29% left on the current one. The corrected number is 8500 miles.

Ranger
12-16-06, 04:53 PM
11,000 miles between oil changes? C'mon....
The 2000+ are actually capped at 12,500 (under ideal conditions). Your '97 is capped at 7,500 (under ideal conditions). I used to get 7,500 out of my '97 all the time as I drive mostly highway.

dkozloski
12-16-06, 08:32 PM
The 2000+ are actually capped at 12,500 (under ideal conditions). Your '97 is capped at 7,500 (under ideal conditions). I used to get 7,500 out of my '97 all the time as I drive mostly highway.
The CTS service manual says to run it to zero and then you have two gas tank refills to get the service done. Mine has varied between 7500 and 12,800.

dp102288
12-17-06, 08:25 AM
^^ Really? Sounds extreme (but precise!!).

dkozloski
12-17-06, 04:14 PM
^^ Really? Sounds extreme (but precise!!).
Bbob said that the woman engineer who developed the system burst into prominance on the basis of the work and is very well thought of by her peers as well as superiors.

Ranger
12-17-06, 04:17 PM
Yup, won some awards as well.