I was seeing what people expected my HP to be once I got my car dyno tuned after my 89' TII gets a BNR Stage II put in along with some other mods, and some people mentioned breaking in the turbo which I hadn't even thought of. I will have a ton of fuel that needs tuning, so I don't want to go driving it around forever before getting it tuned, but I also wan't to break in the turbo a little bit. Catch is, I only have one weekend to fit in the tuning and driving. Basically i'm in VA right now, and the car is in NJ waiting for me to come get it as it finishes up getting everything installed and whatnot, then i'll have basically Saturday to drive it around and get it tuned, sunday will mostly be made up of me driving back to VA. So is it a matter of just putting some milage on it before boosting too high with it, or is there some sort of procedure I should be doing? I am on a REALLY tight schedule so i'm willing to do whatever I can, but it has to fit into my time schedule or I get no car to drive with at all

 

Now i'm hearing there is no turbo break-in period....someone help me out here since i'm confused.

 

Ask Bryan what he recommends for his BNRs.

I do the whole turbo break in thing myself. I just stay out of boost for the 1st 1,000miles. If the engine is already broken in the easiest way to do this is cruise the freeway. Turbo gets to spin plenty w/ minimal load.

 

I've never heard of turbo break in before. I've had a bunch of turbo cars. Turbo break in is B.S.

A turbo is balanced and machined perfectly before it ever leaves the manufacturer. If it was off the high RPM's 100,000+ would kill it quickly. Just make sure you have a new oil feed line and run it.

 

100,000 rpm's?

 

ya that is a common turbo speed ive heard ppl saying they will go about 130,000RPMs when in boost

 

Well, when you get a nice fresh turbo or rebuilt one it has some friction when you spin the shaft. After it has been used a while it spins much more easily.

Why?

Obviously, it has worn itself to new clearances. I think it is just common sense to try to limit the loads put on the bearings while the clearances are too tight to avoid galling.

Like you said, it should be balanced and will spin high rpms even when not in boost- the loads I am thinking of is comming into and especially out of boost, it will load up the shaft MUCH more than just spinning at a constant speed.

Now, if the turbo is rebuilt like a race engine and has larger clearances to start w/ I would say no break in necessary.

Any turbo builders w/ input here?