MBC's capable of running real low boost? (for break-in)

[SnowBird]

Breaking in my engine (stock rebuild). I have an O2 dump and I dont wanna tie open the wastegate and be loud as hell. I just have a MBC and I was wondering if they are able to achieve low to no boost on them. All my exhaust is ported so everything should flow nice.

If I cant get at least 2psi with the MBC and external dump, then I guess my only option is to put on the stock O2 and tie open the wastegate arm.

 

[GVR4592]

The mbc can't decrease the boost level any lower than the wastegate spring allows. So if you have a stock type turbo, that's going to be somewhere between 8-12 psi, which is perfectly fine for breaking in an engine.

 

[kenamond]

The other option is to disconnect the WGA arm from the lever on the turbine housing. That'd let the WG flapper open freely, and you shouldn't build any appreciable boost unless you have some creep issues.

Or you can use your foot and just keep off the gas.

 

[GVR4592]

Or you can use your foot and just keep off the gas.

Unfortunately that won't work for breaking in an engine.

 

[talonalex92]

Stock boost levels wont hurt anything. They are 'Stock' for a reason. More or less the safe point. Im sure you know how to break in your new engine, but just an added tip that helped me along, use A LOT of vacuum and engine braking to help them rings!

 

[jrpmp69]

Just follow whats in this webpage and you'll break it in fast and not have to worry about it anymore:

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

 

[turboAWDfanatic]

Just follow whats in this webpage and you'll break it in fast and not have to worry about it anymore:

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

^^^Best engine article...EVER!

 

[Nicks2319]

Just follow whats in this webpage and you'll break it in fast and not have to worry about it anymore:

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

Thats how i did mine.

 

[SnowBird]

Thanks guys. Im just gonna tie open my flapper, I wanna run no boost for at least the first 5-600 miles of break in, just to be safe. And yes, I plan on doing moto mans method.

 

[dsm-onster]

Thanks guys. Im just gonna tie open my flapper, I wanna run no boost for at least the first 5-600 miles of break in, just to be safe. And yes, I plan on doing moto mans method.

There is no reason to do what moto man says if you do that. The rings are 80% broke in by the first few hundred miles.

Change your oil at 100 miles and 200 miles to insure the metal shavings are flushed out. Stop listening the the ol' v8 boys that believe that you have to go easy on an engine to break it in . You have to run short high cylinder pressure sessions from the very beginning.

 

[tkelly27]

I was thinking about keeping it out of boost while breaking mine in, but the more I think about it and the motoman break in procedure, the more it makes sense to keep the boost around. Stock levels, stock computer, boost leak test before ever starting the car, should mean it will have plenty of fuel (but not too much) and be able to handle everything it's being given. The higher the cylinder pressures the better the rings will be forced out to the side, the better it will wear down the ridges and seal. That's the way I envision it happening, I'm pretty sure the timing belt will go again before I get to test it out : P

 

[turboAWDfanatic]

yeah, keep stock boost. You want to drive it a bit hard (and engine brake a bit hard) at different RPMs to give the rings a good seal. Just don't floor it to redline or push it all the way to the limit.