Turbo failure story

[Eagle]

It could have also been from the sustained stress when it was making those 1/2mile pulls.

That's what I'm leaning towards myself. Most are saying keep LS RPM below 62-6400. I was going thru the 1/2mi traps at 6600+ :eek4:

 

[Handsome Jesus]

I'm skeptical.

 

[Pressure Ratio]

You are not gong to see that hp rating with the motor you have. Swap to a 2.4L and you may have a shot.

I am sure it is going to be some coin and effort to get it done. Maybe a good winter project.

 

[Pressure Ratio]

I'm skeptical.

Skeptical Jesus?




Sounds like a punk rock band. hahaha

 

[Handsome Jesus]

I can only assume this is a journal bearing turbo, yes?

 

[rocket5979]

Gives you a reason to get a bigger turbo now.

Why? Bigger is not always better for the combo. PT88 is plenty big for a street strip car.

 

[willizm]

Why? Bigger is not always better for the combo. PT88 is plenty big for a street strip car.

Troof!!! Hell I'm sticking with a PT7675 CEA and it'll take far more than what I'm currently pushing while being super responsive on the street. It's all about sizing the turbo for the cubes and setup you have.

 

[SirMarco]

Why? Bigger is not always better for the combo. PT88 is plenty big for a street strip car.

You guys just don't understand when a person is being 100% legit or .
Just to clear things up.........

 

[boostedguy05]

So your not into 4 didget hp numbers yet. Last James swap in a 3.8 or two and have will get you there.

 

[SirMarco]

I'm all seriousness though I hope you get this fixed sooner then later. I am looking forward to seeing what your car does in the 1/4.

 

[rocket5979]

this turbo is supposed to be rated to 1250HP... but if you can't spin it hard enough to get there.... Maybe its only good enough for smaller engines.

I am somewhat skeptical regarding this. While what was said regarding pressure ratio vs flow volume, and thus efficiency and wheel rpm are true, the PT88 has been taken further than what you were making on the same displacement; and with similar turbine wheels and turbine housing a/r too.

Unless someone beats me to it (pressure ratio), I am going to plot your figures on a PT88 compressor map to see where your efficiency and wheel rpm generally falls. My intuition tells me something doesn't add up, but I could be mistaken. The data will tell the story.

 

[Pressure Ratio]

I am only making assumptions as I have no clue about the power his car made, boost run and so on. But I would say plot the turbine side too. I think his turbine side will be his limiting side, more so than the compressor side. Oh wait, Precision doesn't give you a map for the turbine side do they?

"Leverage" on the turbine side to spin the comp wheel is not a issue with his cubes. The small chassis of the turbine side back pressure is going to climb as boost increases. I wuld love to see Dan put a pressure gauge per turbo to see what his back pressure looks like. I have a feeling it isn't close to 1:1. The PT88 wasn't designed for this application but many do run it with good success. I think, again I don't know, Dan's car is making good power. The down time has to be aggravating for him.

 

[C.Evans]

Dan..... is it just me or does your office have a party at least once a week?

Sorry to hear about the turbo! Glad the motor is ok!

 

[Handsome Jesus]

inadequate thrust bearing? looks like a 270°... maybe get a 360°. possible result of surge?

I wouldn't change until the problem is chronic.

 

[Eagle]

Called Precision back again. Turns out the NEWEST PT88 that just came out two months ago, the one with the MFS designation, has a 360* bearing and a billet wheel.

Time for an upgrade this winter. In the meantime, she's going to keep running with this turbo.

 

[Eagle]

Dan..... is it just me or does your office have a party at least once a week?

Sorry to hear about the turbo! Glad the motor is ok!

My place likes to party, what can I say? They like to keep morale up with parties... but they work you HARD to make the parties well deserved.

Yeah, super glad the rest of the car is ok. I read plenty of stories of people seizing their turbos while crusing and burning their cars to the ground! Glad that didn't happen here.

 

[Handsome Jesus]

throw a cheap sensor on the pre-turbo exhaust and see what the backpressure is. I would be shocked if it is all that high. That wheel still flows a lot, and I can't imagine your motor being extreme in any way.

 

[SRT41320]

You are not gong to see that hp rating with the motor you have. Swap to a 2.4L and you may have a shot.

I am sure it is going to be some coin and effort to get it done. Maybe a good winter project.

I have a 2.4L

glad to hear its just the turbo and no damage to the engine or even from the turbo into the engine!

 

[Pressure Ratio]

throw a cheap sensor on the pre-turbo exhaust and see what the backpressure is. I would be shocked if it is all that high. That wheel still flows a lot, and I can't imagine your motor being extreme in any way.

If you want to go low tech I have heard when people welded in a NPT bung in the crossover, coiled a bunch of copper tubing (to act as a heat sink) and then ran that to a mechanical boost gauge. Then just had the two boost gauges together to see the readings.

 

[Handsome Jesus]

That's what I was sorta getting at

 

[Pressure Ratio]

That's what I was sorta getting at

OK, I thought you meant more like data logging a electrical sensor. Which is cool. But might be more costly and time consuming. Unless that was something you decided you wanted to data log in the future. Which is nice to have.

 

[Handsome Jesus]

was thinking about going that route sometime. because I want to know.

 

[Pressure Ratio]

It is good data to have. Helps figure out issues, when upgrading turbos and so on. I have to wire one in my car yet. Still looking for a sensor I can use with out costing me $300 or melting it. haha

 

[Eagle]

I am somewhat skeptical regarding this. While what was said regarding pressure ratio vs flow volume, and thus efficiency and wheel rpm are true, the PT88 has been taken further than what you were making on the same displacement; and with similar turbine wheels and turbine housing a/r too.

Unless someone beats me to it (pressure ratio), I am going to plot your figures on a PT88 compressor map to see where your efficiency and wheel rpm generally falls. My intuition tells me something doesn't add up, but I could be mistaken. The data will tell the story.

Do it. My understanding is that no compressor map exists for the pt88.

 

[Pressure Ratio]

Do it. My understanding is that no compressor map exists for the pt88.

Yeah, people go off a map with the wheel used in the pt88 but in a different compressor housing or something like that. It is rumored to be close I guess. But nothing for the turbine side from what I have read.