I have a spare b18a1 that im building right now with forged internals and acl bearings… After the build Id like to boost but Im just wondering if I should break the motor in first without boost or just boost it right away? also would the stock map work okay with the change pistons, rods and bearings or would I have to get a map made for it?
i would just put the turbo on and try not to go into boost(or 5th gear) for the break in, then after 60-100 miles rip on it. 
if you are boosting you will probably want to change your map sensor out for a 3bar, it has nothing to do with your internals tho.
i would run it NA for at least 2k miles. that way you can make sure that your rings are properly seated and the rest of the motor is broken in well before you go boostin.
I ran mine for 6,000 miles before adding the turbo. Break -in periods are very important.
Break it in the hardway NA, then apply boost ocne you comfortable. my motor was seeing 8000RPM revs NA after 5kms. then once I was comfortable with it and knew it was worknig fine and rings have seated properly, applied boost. 400+hp right away. Ended the season running 30psi on a GT30R reving to 9500. perfect leakdown and compression. Tunnig is key.
This is on a fully built 2.0 GSR block, ITR head
breaking it in the slow way, like the above post(6000k) is the worse thing you can do on a built motor, performance, and longevity wise. It is proven if you break it in the hard way under accell and decell load, you will have better leakdown results.
if I run N/A for 6000km can I just use my stock basemap? or do I have to get a tune for the new internals?
well i would hope you are running a wideband, in that case just keep an eye on your a/f and give the oem maps a shot. i thought you were talking about map sensors before. lol, i must have been tired.
yeah I plan on getting a wideband before the install… thanks for the tips
tch hows ur car now .also is ur car a daily driver or for trtack only.i heard people say break in the car like how u going to drive the car but most people say break in easy for 1500km then go crazy.what do u think
turboda4dr: Liek I mentioned in a previous post:
“my motor was seeing 8000RPM revs NA after 5kms. then once I was comfortable with it and knew it was worknig fine and rings have seated properly, applied boost. 400+hp right away. Ended the season running 30psi on a GT30R reving to 9500. perfect leakdown and compression. Tunnig is key.”
My first day at the track was only about 400-500 KMS on the motor. 300 of which was me driving to the track. And I was already running mid 12’s on street tires first day out
I broke it in the way I drive it. This is my daily driver also my drag car. I drive my car to the drag strip which is over 300kms away. I drive it to work as well, heck, I go to buy more groceries in my DA, then my stock G3 GSR lmao. It’s just too fun to leave locked up for track days IMO.
haha good point i wiil defin keep ur advice in mind thx again
TeggeT and turboda4dr, keep us updated you guys!!!
just got my car lastnite trying to break in the engine.willpost after dyno .Hoping to hit 500:excite: :excite: :excite:
you stupid nancies
your rings wont seal if you don’t rape the motor after the first warm up
get it warm
change oil
rape it 20-60 for 10 minutes and your rings are done sealing
if its going to be a turbo motor, break it in with turbo
dont have to call names bud .how do u know how i break in the motor .YOU DONT.SO BACK OFF!!!
well actually in taking offense chances are you do wait some crazy amount of time. i hope you run the engine for a few minutes before breakin to be sure there are no leaks and everything is working correctly.
I’ve been reading different break-in theories for a long time. From all of my reading, I have concluded that there is no “perfect” way to break in a motor. Some say go easy for like 5k miles, some say warm it up and beat it down. The people who I feel are the most reputable (ie: King Motorsports, Russ Collins, etc) seem to agree that a slower break in will allow a motor to last longer, whereas a more aggressive break in will yield more power, but at the cost of a shorter lifespan of the motor.
so far so good guys im taking it easy for about 1500km but i still zing the engine every 20-25km.So far theres no leaks and the engine feels strong.
Then there are other theories that say break in isn’t important for modern engines. Way back when, engines weren’t built to very good tolerances and that’s what made a break in period important. With modern engines that are built to much higher tolerances, break in isn’t very important. The first few miles are important only in the sense that you need to make sure everything is working correctly.