Actually the dbb means it will be flowing more at a less rpm / ( less cam ) as well as less throttle position opening making it more prone to surge even if the wheels haven't changed . But like stated in the previous post they have made them already work so must not be an issue .. possibly or if it is they possibly were able to fix it with larger throttle body, larger valves, or some other means. Bump for asking about dyno graphs again as well

 

That is correct however, I'm not to sure how much sooner the bbb (ball bearing black) will spool over the std black. I have been told 3 different things about bb stock apearing turbos from 4 different companies. Seem that most say it won't change spool at all, but will drasticly improve transent response. The only person I have talked to that said it will improve spool was Lee.

Tom you need to get that thing on the dyno and let us know about spool. The only thing that will suck is it will not be a 100% back to back so we need to take that into account. Try to do it on a day that temp,humidy is close to the same.

Mikey

 

My main interest in a DBB Black or any other DBB stock frame turbo is the reliability increase. That alone is worth the extra $. If you could buy a Black without an oil feed line and use that $300 towards the DBB upgrade it would be awesome. The only negative would be if the shaft is thinner on the DBB making it weaker and more prone to break under compressor surge. that surge could be caused by BOV or too fast spool with an inefficient motor.

Good Luck Tom!

 

This should be a badass combo man. I cant wait to test it out. I'll have my backup journal bearing turbo from FP also so if something happens to it early ill at least have a spare to throw on.

the journal bearing is still reliable when the right mods are used.. ie.. baffled oil pan, good oil, and the proper oil supply to the turbo at all times.

the only thing i have to do with the owens FP black is buy a FP .030 restrictor inline and i can still feed off the oil filter housing.

the turbo itself has a built in .040 restrictor as well. owens has lots of experience on touring cars and long endurance races in general where you're constantly in boost.. so if their turbos can withstand conditions like that im sure ill be fine for a while with one of their modifications done to the black. (i hope)

 

Same project ! MAP will send out to Hungary the 2.4 engine parts and a ported FP black turbo what will Owen convert to Ball Bearing It have to be funny with the S3 cams in a Mitsu Outlander

 

So, two to three more months of this before you will actually have this turbo, maybe... Awesome thread.

 

IN for results.

 

sounds like a awesome project you got there.

what makes you say that? its being built right now and the ball bearing center section will be complete in the next 2 weeks. after that we just need the turbine wheel from FP and then they ship it out.. it should be by the end of June.

same here. dont make the mistake and get a laggy turbo.. you wont enjoy your evo as much if you sacrifice low/mid range over top end.. keep it balanced.

 

Doesnt it need to be balanced after this?

 

no not really.

 

130k RPM, no balance needed? I thought BB center cartridges had more free play than journals...

 

he was referring to the video. personally i dont see how you can upgrade to a bigger compressor wheel and not balance the turbo.. i mean i guess it will work, but the question is for how long? putting a 20g wheel in a 16g turbo..... that has to change the balancing quite a bit.

the only time that its ok not to rebalance is if for example youre changing the seals in the turbo or something else that failed but didnt cause any damage to the turbo charger.. then you just scratch or mark the wheel with the shaft position and count the turns it takes to undo the nut and make sure its put back on the same way.

in that case id say you just lined it back up where it was balance checked before and its good to go.

for my situation yes owens is doing tons of things im sure to the new rotating assembly. lots of high speed testing and so on.

what do you mean by free play? spinning? if so yes.. ball bearing spins way free'er then a journal bearing turbo. you can turn the car off and the turbo will remain spinning for 20 seconds after the cars off, where as the journal bearing will slow down within 5 seconds or so. thats why the bb has more response, because it can maintain speed in-between shifts and light throttle response.

 

Looks like ill have the turbo by the 2nd week of July, maybe sooner. will update again when it arrives.

For now i edited the first post with some new pics of stuff i bought to help oil control... if this dont work ill get a dry sump setup from norris designs. i dont think ill have anymore trouble though, i dont do any hard high rpm turning or anything.

 

will be sick. subscribed for results

 

I'll make videos of it spinning and stuff before i install it. i cant wait to receive it!