Fd3BOOST

WTF is that? It looks like epoxy putty. Is that a repair?

boost_this

The black shiny area is actually baked on/glazed oil.... the crack actually extends into the housing up into the compressor area! Not very rebuildable...arrgh. Looking for another set as we speak.



Did you finish yours up tonight?

Fd3BOOST

https://www.nopistons.com/forums/index.php?...80&#entry549874

Yes and no. It's all done but Iforgot to put the check valve back in the map sensorline and my fuel presures are all off and need to be set to get it to start up. But the wrenching is all done.

j9fd3s

wow thats a lotta oil. cracks pretty normal i wouldnt be too worried about it. hows the manifold flange of the turbos?

boost_this

The manifold flange is pretty good...hardly any cracks at all.... The turbos actually look real clean. So your saying the crack should not effect performance or the oil control issue?



I am having a hard time with the last nut so I have yet to actually see inside the housing and look at the oil seal on the turbine side. Do think that is crack is even usable? Still new to these things and any cracks look bad to me at this point.



Thanks,



Chris

boost_this

Yikes, here is what I found under the cracked housing.... the turbine wheel looks to be melted or at least really tore up....lots of burnt oil. Not sure what the heck could have caused that during a simple break in procedure?? Could I be running so lean (i had to kick the TPS real low get the idle down below 2k) that it heated things up that quickly (less than 30 mins total run time on this motor)? The turbos really do look to be low mileage....almost no shaft play at all, real clean inside...but damn that side got tore up.



It looks like I will be pulling a one of my used cartridges out of the original turbos, rebuild it with a turbo city kit and then put it all back together.



On another note, I still can't seem to get the fans to come on (one of the reasons I haven't ran the motor much at all). I checked all the fuses, tried a diff set of fans, grounded the black connected to the ECU and try grounding the mazda miata temp sensor to see if I could get them to kick on... I can here relays clicking but no movement... any way to check the relays or bypass to verify they are the issue?



Thanks,



Chris

j9fd3s

hmm we managed to melt a turbine wheel like that, it took 5 laps at buttonwillow, one of the apex seals stuck down and dumped raw fuel into the exhaust

Fd3BOOST

Chris how is it coming along? Shoot me a call.

nyt

thats not melted that looks like physical damage, like a seal blew out and hit it. if you bought those used, someone scammed you.



Also, as a side note, if you flood a motor badly, gas will get into your oil thinning it out.



I installed a wolf3d into my turboII and missed a bare spot in one of the ground connections while wiring my fuel injectors, needless to say, a 1680cc injector stuck open flows a lot of fuel. it was pouring out my exhaust manifold.



Unfortunately for me, at the time of this, I also installed a new turbo, and thought the oil seal was shot and i had a shitty turbo. I was pissed. After I came to my senses I realized what happenned, changed the oil, and everything was fine.



Granted, thats definitely not what happenned in your case, but may serve as a decent bit of information for anyone else thats ever in the same situation. I already saved one person in the #rx7 irc channel from sending a good turbo to be rebuilt w/ this info, hopefully itll help someone else too

jhammons01

Did the smoke stop???