I'm curious as to what break in method's you guys used, what kind of gas mileage do you get, and what kind of driving do you normally do.

I'm asking because i'm at about 150 miles on my G35 now and it's time to decide if i'm going to continue to use the prescribed method in the manual, or to take a more methodical approach such as systematically bringing the RPMs higher and higher each time and hitting redline a couple of times before the car is fully broken in.

So if you could, please post:

-Break in method
-AVG Gas mileage
-Type of driving that you do


Thanks!

 

under normal driving conditions i drive it like i stole it, but during the break-in period i went by the book, really hard to say bout gas milage since i dont have nav

 

here's a typical way i break in all my engines, 2-stroke and 4-stroke. in this case, i broke in the car in this manner.
you must warm up the engine to normal operating temperatures before breaking in. then drive the car, loading the rpms up to 3000rpm and going no more than 3rd gear, and engine braking back to 1st. do this for 10 - 15 minutes. after the allotted time, let the car cool down for about 15-20 minutes. repeat the process up to 4000rpm up to 3rd gear, and engine braking to 1st for another 10 - 15 minutes, and rest for another 15-20 minutes. 3rd time around, go up to 4500-5000rpm up to 4th gear and engine braking down to 1st. do not redline or bounce the tachometer. soon after your break in session, change out your oil and oil filter to get rid of the metal debris from the engine break in. drive normally thereafter, a few occaisional engine loading is a good thing but do not go buck wild. after 1500miles, then you go buck wild and and bring the tachometer to redline under engine load. change out your oil to remove the excess debris again. after all the engine i've rebuilt, metal debris wont stop till about 5000 miles.

there are other means to break in the engine. one is to drive the car like a bat out of hell. it's been proven to bring out the most power potential any engine. it's also been said that it also decreases the longivity of the engine. heat cycling is a mild form, using the engines heat to kind of mold and form the engine. think of it like washing clothes that arent preshrunk. the heat of the engine expands the engines metals, letting it cool down will get the engine to a normal state. continually heating and cooling will get the engine to a happy medium. also, the trick to a good break in is to properly use the engine honing scores before they wear down. the scores are like files that shape the rings to seal properly.

anyways...have fun.

 

Simple, warm up good, especially in the morning. Drive with shift points between 2500 and 3000 rpm (just where the exhaust sounds good). I currently have about 950 miles on, and am averaging right at 20 mpg, almost all city stop and go.

I will change oil at 1200 miles, and again at 3000, then 3000 every oil change. I will throw the pork to it after 1200 oil change.

 

I systematically raised the RPMs higher and higher, but NOT under load, during the first 1200 miles, with occasionnal passes to redline - again, NOT under load - and get 19 in the city with pretty aggressive driving, and 26+ on the highway at around 80 mph average.

3000 miles on the odo

 

What do you mean by "not under load"?

Did you do it with the car in nuetral?

 

in contrast

"The temptation to fire up a new vehicle in the garage just to "hear"
the new engine run can be very strong.

This is the worst thing for a new engine, in fact, my advice is:
don't even start it up until you're ready to warm it up for the first ride.

The reason is that brand-new rings don't seat all the way around the 360 degrees of their circumference. The gas pressure from hard acceleration forces the rings to contact the cylinder around their entire circumference, which is the only way the rings can properly wear into the exact shape of the cylinder to seal the combustion pressure.

Now, imagine if the engine is run in the garage. There is no load on the engine, so the rings are just going up and down "along for the ride". Only a small portion of their surface is actually contacting the cylinder wall. The ring area that does contact the cylinder wears down the roughness of the honing pattern on the cylinder walls. Once the roughness of the cylinder is gone, the rings stop wearing into the cylinder. If this happens before the entire ring has worn into the cylinder and sealed, you will have a slow engine no matter how hard it gets ridden after that point.

The difference between what happens in an engine running in the garage, versus one being ridden is a hard concept to put into written words, so if I may use the sounds that we all can relate to: it's the difference between "zing-zing-zing" and "bwaaaaaaaaaAAAAAA"

During "zing-zing-zing" the rings don't get loaded for more than a split second, whereas during "bwaaaaaAAAAAA", the engine is in 100% ring sealing mode."

Mototune USA - Break In Secrets

I won't argue against this guy as a fellow engine builder.

 

Broke it in IAW the manual

Averaging 22 - 23 MPG about 65/35 average city/highway

'Normal' driver. Easy starts - semi-aggressive midrange at times - speed limit +/- driver.

 

I went over 3-4 times during breakin period, but never redlined the car. I may have pushed it up to 6k rpms.

I avg around 22 mpg city/highway

 

I took a lot of care during the break in period of my G and I average 9 to 12 MPG city driving... anyone think its a car problem or is it just me driving like crazy? (Cuz I do).

 

Break In Method.

While leaving dealership, shift from 1st to 2nd gear at 6k rpm. Next, shift from 2nd to 3rd gear at 6k rpm (VDC works). Enter Interstate onramp and drive WFO for next 14K miles. Average mpg = 22 (half city/half highway).

 

same here, i average 23 mpg city & hwy, mostly city.

 

i average about 20-22mpg city driving, and lots of stop-go traffic. got about 1200k on the car right now, still breaking in. definitely warm the car up for about 5-10 mins before you start driving, even if it's warm outside. i never did go up above 3000rpm with some exceptions on particular occasions like trying to get in front of a 18 wheeler! I can't wait till i'm done breakin' in, so I can truly test the power of a G!

 

When I asked the jacka$$ who sold me the car what I should do to break it in he told me not to go over 100mph until 800 miles. Pretty bright guy

Anyway I have 250 on it now, and am trying my hardest to keep it under 4k... It feels so good that I'm not sure how long I can last