moparfan

https://www.google.com/url?sa=t&sour...69dt4vrPnV2FBQ For reference

LetsGetThisDone

iTrader: (1)

Weird, it's almost like what I said was correct...



If you look at a PTE turbo, the CHRA is small, and has heat sink fins. In direct contrast to a larger Garret CHRA with water ports and no heat sink fins. The PTE CHRA is designed around not being water cooled.

Jaraxle

I believe one of the main differences is that PTE turbos use CERAMIC ball bearings. They are less sensitive to heat induced damage than say Garrett ball bearings which are I believe are NOT ceramic ball bearings. That is one of the design differences. I am also a bit of skeptic about having a non-water cooled CHRA on a street car. However, it does seem that precision guys either 1.) a fantastic of allowing a cool down period after a blast or 2.) Precision somehow engineered these things tough using methods such as I mentioned above.

~Jaraxle

Jaraxle

From the link posted above (by Garrett):

" Both the inner and outer races are made of various grades of steel
that are very strong and hard under normal operating conditions, but which are reduced when
temperatures get too high. The strength and hardness of a typical ball bearing race starts to
rapidly degrade at temperatures above 300°F (150°C). "

This is not correct for ceramic ball bearings, which Precision uses.

~Jaraxle

laxhero2

iTrader: (6)

Just checking in our build. How are things with your car?

RazorLab

iTrader: (8)

wrong thread... ooops

laxhero2

iTrader: (6)

LOL, I've already read through yours like twice. I'd normally read it like a bed time story so I have good dreams.

PolloVagabundo

iTrader: (1)

You have't made a post so hopefully no issues?
Just wondering how things went with this set up, if you still have it? Let us know!

LetsGetThisDone

iTrader: (1)

I'm pretty sure @razorlab's has been fine other than some issues with the turbo itself. Which, it's a precision, so they can be like that. With the new Gseries turbos from Garrett, MAP needs to/should make the necessary changes to produce this kit with the g25, g30 and g35 series Garrett turbochargers.

RazorLab

iTrader: (8)

That said, I don't have a ton of miles on it. (Maybe 5,000) However, A lot of hard miles and a bunch of track days. It's been through A LOT of heat cycles.

I took the manifold off recently and it's still perfect. As it should be, it weighs a ton.

I've teased the idea of getting the flanged chopped off and a Garrett flange welded on but... we'll see how the 5558 is.

LetsGetThisDone

iTrader: (1)

I think your track use, especially with all of your custom heat shielding REALLY holding the heat in those parts is a good indicator that the hard parts of the kit are good to go. The turbo is what it is. Everyone knows precision's can be finicky and sometimes blow up for no apparent reason. Its the risk of using the turbo's that make the most HP per mm.

RazorLab

iTrader: (8)

One thing I noticed when I was removing the turbo is that the oil drain was not oriented straight down. Which may be the reason the turbo smoked.