broke turbo

[kingots2004]

anyone ever had a cpt 66 break the shaft?mine broke today at 4200 rpm at 60 mph.i was starting to tune on the car made 2 passes at 17lbs of boost 60 injector duty cycle then went to 21 pound got alittle knock like2 degrees added some fuel got in it easy bringin up boost then heard a hiss sound then a pop and grind sound and a major smoke show.i pulled the turbo off and the compressor wheel was broken so i took off the exaust housing and the wheel feel out it broke right at the seal.i cant get the shaft out because it broke at the fat part of the wheel so i can hold it to break the nut of the intake side.what caused this do you guys think.i ordered a cpt70 to stepup a little and dont want this to happen again.is the cpt 70 a good turbo?i liked the 66 but thought i would step up a little since i had to buy it anyway and i havent got my converter yet.

 

[TurboJoe3.8]

Never heard of that one!

I'd Call Jack cotton ASAP

 

[10secvega]

My PT 53 failed the same way.

http://www.turbobuick.com/forums/turbos-turbo-related-parts/219665-why-did-fail.html

 

[kingots2004]

i did call jack but hes gettin married today so i didnt get to talk to him.what do you guys think of the 70 over the 66 does the 70 have high 9 sec in it with the right mods?10 sec vega i read the link you posted,mine hasnt been smoking at all till the turbo blew out the seals when it messed up it all happened very quickly but im going to check into this filter i though turbonetics had the filter in it?thanks guys for the imput

 

[Phoneguy]

How old is the turbo? If it is less than a year it gets replaced for free-NO QUESTIONS ASKED. Best warrantee around. I have the CPT66 BB and had a issue with lateral shaft play-Turbonetics sent a "call-tag" to pick it up, repaired the turbo and sent it back in less than a week with no charges even for shipping.
Bryan

 

[kingots2004]

see i dont know it was on the car when i got it and the tag with the serial number isnt on it so i there is no way to prove how old the turbo is:frown: but you bet yo butt the new one will have it

 

[PaCemkr86]

you should post some pics of your car Kingots, i know i've seen pics of it on here before, and maybe somebody will know the person who put that turbo on

 

[Louie L.]

My PT 53 failed the same way.

http://www.turbobuick.com/forums/turbos-turbo-related-parts/219665-why-did-fail.html

My PT53 did too.

 

[kingots2004]

i hate to post this but...ive been on the phone with turbonetics and they said a contributing factor to our cars breaking the exhaust wheel is a lack of a BLOWOFF VALVE thats right i said it BLOWOFF VALVE.the constant pressure on the wheels and bearing and shaft can be avoided by using a blowoff valve.the trick with maf cars is the blowoff valve must vent back into the intake tube between the maf and turbo inlet so the computer doesnt think the motor is pullin air when the blowoff valve vents.i dont care who makes fun of me for having it im not breakin another 1000 dollar turbo because of a 200 dollar part.and for those that say buick didnt put one on at the factory so we dont need them they also didnt put cpt 66 or 6776 duel ballbearing turbos and 60lb injectors on them either

 

[bison]

They can say that but the truth is that it was probably a fluke. We have been running big and small shaft turbos for years without problems like that and no blow off valves. That is except for the several that got early PT53 units and had the turbine shaft failure.

 

[notacarlo]

So......I recently (like as I was reading this) started a business selling blow off valves. This will solve all of our problems and the children who make them in China are well fed.

They really told you that? Did you tell them it was a Buick and not a Hondazukideyota?

Turbo's fail, that's all I would chalk this up to.

 

[TurboJoe3.8]

i hate to post this but...ive been on the phone with turbonetics and they said a contributing factor to our cars breaking the exhaust wheel is a lack of a BLOWOFF VALVE thats right i said it BLOWOFF VALVE.the constant pressure on the wheels and bearing and shaft can be avoided by using a blowoff valve.the trick with maf cars is the blowoff valve must vent back into the intake tube between the maf and turbo inlet so the computer doesnt think the motor is pullin air when the blowoff valve vents.i dont care who makes fun of me for having it im not breakin another 1000 dollar turbo because of a 200 dollar part.and for those that say buick didnt put one on at the factory so we dont need them they also didnt put cpt 66 or 6776 duel ballbearing turbos and 60lb injectors on them either

I would still call Cotton when he gets back next week- I'm willing to bet he will still help you out in some way-

 

[kingots2004]

yeah i will ill call him.i knew this would get backlash but every guy i know that runs outlaw 10.5 and has a turbo runs blowoff valves period.i know they dont do it for the sound.i ran one on my eight second vega.i just dont think this was a fluke mine was a big shaft turbo and it broke in THE SAME PLACE as the 53.i dont understand why everyone is so dead set against these things working.if you dont have a blowoff valve and you get out of the throttle where does 28# of boost go?i say back to the turbo inlet wheel this cannot be good on the turbo.think about it fellas its twisting on the shaft and whats gonna break the weakest part.im gonna run one it cant hurt if you run the correct setup.look on the fastest cars in the country im talking 7 second cars and they have blowoff valves and cotton sells them on his turbobuick website for what reason?

 

[D's GN]

You do not have to plumb it back to the intake, no hesitating, stalling or driveability issues at all, I use it with a 66BB, best one to use is a Tial 50mm with a 11psi spring, use a good vaccum signal. The 11psi relates to the vaccum at idle and not max boost. I have run this thing over 28lbs with no issues, no ricer squealing just a nice whooshing sound.

 

[kingots2004]

So......I recently (like as I was reading this) started a business selling blow off valves. This will solve all of our problems and the children who make them in China are well fed.

They really told you that? Did you tell them it was a Buick and not a Hondazukideyota?

Turbo's fail, that's all I would chalk this up to.

if i buy the blowoff valve through you do i get some speed tape for free?

 

[kingots2004]

thats cool and it doesnt throw the computer off thats good.you still run the mass air flow system and not speed density?speed density doesnt need to be plumb back in because it doesnt meter fuel through the maf sensor.

 

[D's GN]

I was using an Ls1 Maf and a Translator Gen 2 /Extender chip with the BOV.

 

[Phoneguy]

Kingot, if Turbonetics wont fix the turbo, I could use the exhaust housing. I have a stripped bolt hole. Let me know.
Thanks
Bryan

 

[bison]

yeah i will ill call him.i knew this would get backlash but every guy i know that runs outlaw 10.5 and has a turbo runs blowoff valves period.i know they dont do it for the sound.i ran one on my eight second vega.i just dont think this was a fluke mine was a big shaft turbo and it broke in THE SAME PLACE as the 53.i dont understand why everyone is so dead set against these things working.if you dont have a blowoff valve and you get out of the throttle where does 28# of boost go?i say back to the turbo inlet wheel this cannot be good on the turbo.think about it fellas its twisting on the shaft and whats gonna break the weakest part.im gonna run one it cant hurt if you run the correct setup.look on the fastest cars in the country im talking 7 second cars and they have blowoff valves and cotton sells them on his turbobuick website for what reason?

They run the blow off valves to keep the compressor nut from loosening. Its simply not needed in 99% of applications with an automatic. It wont hurt running one but there are other things to spend money on that are more wise in almost all instances. Ive run everything from stock up to T72 at 30 psi with no blow off and never had a thrust problem, broken turbine, or loose compressor nut. Ive seen loose compressor nuts on some mid frames though. The exhaust wheel has to much inertia in those applications and the back flow unscrews the compressor nut .

 

[kingots2004]

Kingot, if Turbonetics wont fix the turbo, I could use the exhaust housing. I have a stripped bolt hole. Let me know.
Thanks
Bryan

ok ill let you know