Tinker219

I made this late Friday at 22 psi, 10.6:1 A/F ratio(I wanted to be safe) on 92 octane. Seems to be impressive, stock SRT4 engine w/only fuel/turbo upgrades.
Then on the half-way home I stopped for gas(4 hour trip). Turbo-timed for a good minute, shut er down and filled up. Started back up, and took off to an EXTREMELY noticeable vibration coming from the turbo(solid engine mounts), and a sound that accompanied acceleration that I can only compare to a Mourning Dove, or blowing over the top of the bottle. This sound would rise and fall w/load/RPM. I pull over, filter(screen) is still there, so nothing obviously huge was sucked in. I have no choice but to keep going, theres work to be done at home, so I baby it home trying to keep the turbo wheel speeds at a minimum.
Get home, take the screen off, wheel has contacted the housing badly, and its very obvious that the shaft is bent(2mm or so out of center). Luckily my t4/60-1 that I thought was toast still runs, so I put that on there for now until I figure out what to do w/the SC61.
Im not out blaspheming Precisions name(nor am I expecting them to do anything about this), Im just trying to get a grasp on what happened.
Has anyone else had a problem like this? Make 400whp, then two hours later have the turbo just "fail" on a leisurely cruise to get home?


Modified by Tinker219 at 7:45 AM 6/13/2004


Modified by Tinker219 at 8:40 AM 6/13/2004

Rod.

I never heard of any problems like that. That is a little weird, a stupid question was that sc61 used?

Tinker219

I bought it 2nd hand(why Im not expecting Precision to handle this), brand new. I used it for 10k miles w/nothing but praise. Then one day the shaft just bends, turbo goes to junk...

FOrSfEd

That is pretty weird, i too have never heard of that.

ebp 99 si

nice numbers on the srt4
sorry to hear about the turbo takin a **** on u

delslowh23

hmm, Could it have been out of blance and now at 22 pounds+rpms was just too much for it? But i guess that would of happen at the dyno not on the way home.

b00stedbyFastrax

never had a shaft prob, but had a sc60 boosting @ 24psi for about three months when i ran into a prob where the the turbo was feelin sluggish. took if off and found that a fin on the compressor wheel was bent. there was no visible signs of any damage on the fin. weird. anyway, precision had it fixed without charge.

warhorse 4.6

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by delslowh23 &raquo;</TD></TR><TR><TD CLASS="quote">hmm, Could it have been out of blance and now at 22 pounds+rpms was just too much for it? But i guess that would of happen at the dyno not on the way home. </TD></TR></TABLE> That way I don't like Centrifugal blowers and turbos you have to spin the hell out of them to make boost. My car does not making boost till about 3500rpm to redline. Sound to me you had some type of metal brake down from spininng up so high. How fast can you spin the turbo be for it maxed out????

STHPERFORMANCE

Nice numbers Cody.......
Sorry to hear about your turbo problem. When you get around to it, Hit me up on AIM. I have a few questions for ya boss....

-Scott
Srt4z ownz j00

Tinker219

well, Ive heard of SC61s doing 28psi, they are good to 700hp, so Im not sure what the heck happened. I tested my IC piping when I got home to see if I might have "overspun" the turbo, and it was good to 30psi. Im not sure wtf happened. I talked to Stan, he was going to talk to Art(where the turbo came from, "lsvtecvx" bought it new from Art). We will see.
If this doesnt pan out, Im going to barter for an Innovative BB unit, and have one expensive-*** mock-turbo with a bent shaft.

B18C1CYA

how expensive is it to have the shaft replaced or cant that be done?

alpha

The fact that you were running it at 22lbs wasn't the problem. I have seen people push 28lbs with my own eyes out of the T3 SC61. Sorry to hear your turbo went south on you though Maybe someone at Precision will see this and take care of you. Maybe not ...

Turbocivic94

Nice #'s Cody
Sorry ur turbo took a ****

Suprdave

Why weren't you running a filter?

m R g S r

Didn't espanol have a problem with his sc61 not too long ago? I am not sure what exactly happened, but he said it blew. Cody, On the way home, did the car build any boost at all?

Drew Peacock

Hows the oil feed to the turbo? Not blocked? Mine got something in it causing the same thing to happen not a precision turbo though.

Tinker219

I had a screen on there, which Ive never had any problems with in my 3 years w/turbos. On days that I knew Id be tredding rough roads, Id slip some panty-hose over the screen.
As for fixing it, the compressor wheel contacted the housing pretty bad and shaved away probably 40 thousands of the surrounding housing. The wheel itself miraculously is still intact(because I knew there was a problem, I didnt push it). So there is no hope of fixing the turbo, except saving the exhaust wheel/housing.

No it would not build boost with the compressor wheel milling the housing away(once I heard the sound, that was all I pushed).
Oil feed is fine, still running my t4/60-1.
Again, I just want to make it clear that Im NOT upset; just puzzled, because Id like to avoid this again in the future if I can find out the problem.

Blackack26

Lemon? Could of just been a freak failure...

Tinker219

Im starting to think so, all opinions that I have gathered point toward over-spinning the turbo. But boost is solid at 22psi, and as stated before, the piping was tested to 30 psi with no leaks.

hulkhb

Damn that sucks man, hope you figure it all out.

alpha

Did the original owner use it at all? About how many miles do you think was on it? I had a turbocharger a while back that was damaged from shipping. Compressor wheel was touching the cover but luckily you could actually hear the contact. Just throwing stuff out there as I have no idea how many miles are on that turbo

Tinker219

There are 10,000 miles put on by me. The turbo was BRAND NEW when I bought it. There have been 0 problems for the past 3 months/10k miles, then it just took a p00p.

twkdCD595

definately not from 22 psi... gas turbine guys been converting turbos and running much more rpm than this.

sounds strange though... have you have the unit apart to look inside for anything that may have got through the mesh screen?

CiH22vic

Not sure if this has anything to do with it but I was talking a mod from one of the DSM boards that just moved to my town and he said that he doesn't like Precision turbos because the thrust bearings are not bolted in so it can cause problems when you run a high amount of boost on them. He said they are fine as long as you don't turn the boost up pretty high but they are not good because the trust bearing just kinda sit in there? This may not have anything to do with it because I've never really heard too many people say this has happened, just offering a suggestion?

Tinker219

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">have you have the unit apart to look inside for anything that may have got through the mesh screen?</TD></TR></TABLE>
Im not touching it, incase someone may do something about it. The only thing I have done is loosen some compressor housing bolts to remove the turbo.