GT Motorsports: 370Z Supercharger system development

JoeD · 10-08-2009, 12:43 AM

Quote:

Originally Posted by kannibul

There's also something about turbos and turning off your car. I nearly bought a cobalt SS (I know - lol), and I did a bit of research on turbo-cars, and you're supposed to wait 30 seconds to a minute before shutting off the car, so the turbos can spin down as much as possible so that when you shut off the engine they don't burn the oil (out of) in the bearings/seals due to heat and continued movement until they stop spinning. This can cause issues with the bearings and seals getting damaged, causing pressure issues and leaks.

S/C - you turn the engine off, it stops, no parts moving afterwards without oil pressure.

Turbo cars also need their oil changed more often - they add a lot of heat cycling to the oil, making it "wear out" faster.

At least, that's what my research has suggested. I have no experience on the matter.

I can't quite put my finger on why, but I LOLd while reading this. Seriously.

kannibul · 10-08-2009, 08:06 AM

Quote:

Originally Posted by JoeD

I can't quite put my finger on why, but I LOLd while reading this. Seriously.

OK. Thanks for sharing.

So, cars come with a turbo-brake on them now to prevent them from burning the oil in the bearings?

I mean, most oils start to have issues around 400F. Exhaust temps are what, 1300F....

You shut off the engine, you lose all oil pressure. What's feeding the bearings to your turbo, that's still spinning...?

Compare that to a belt driven supercharger...you shut off the engine, the supercharger stops spinning.

LiquidZ · 10-08-2009, 08:50 AM

Quote:

Originally Posted by kannibul

OK. Thanks for sharing.

So, cars come with a turbo-brake on them now to prevent them from burning the oil in the bearings?

I mean, most oils start to have issues around 400F. Exhaust temps are what, 1300F....

You shut off the engine, you lose all oil pressure. What's feeding the bearings to your turbo, that's still spinning...?

Compare that to a belt driven supercharger...you shut off the engine, the supercharger stops spinning.

Turbo timers help prevent oil cooking issues with aftermarket turbos. Essentially, they allow your car to idle for a minute or less once you remove the key from the ignition. This keeps oil circulating through the engine and turbo to not only allow for any necessary lubrication of the spinning turbo, but to circle the oil throughout the engine to help cool it.

kannibul · 10-08-2009, 09:00 AM

Quote:

Originally Posted by LiquidZ

Turbo timers help prevent oil cooking issues with aftermarket turbos. Essentially, they allow your car to idle for a minute or less once you remove the key from the ignition. This keeps oil circulating through the engine and turbo to not only allow for any necessary lubrication of the spinning turbo, but to circle the oil throughout the engine to help cool it.

So is it something like an auxillary oil pump, or something else?

LiquidZ · 10-08-2009, 09:10 AM

Quote:

Originally Posted by kannibul

So is it something like an auxillary oil pump, or something else?

It is not an auxilliary pump. It is a small control module that is connected to your car's ECU that allows the car to run for a set amount of time once the key has been removed from the ignition.

RCZ · 10-08-2009, 03:13 PM

Quote:

Originally Posted by kannibul

So is it something like an auxillary oil pump, or something else?

No, they just literally keep the car turned on for maybe a minute or two after you remove the key and get out. Thats all they do.

You used to have to let turbos cool down by idling the car a little bit before shutting it off, but that is no longer necessary with today's turbos. Turbo timers really arent necessary nowadays, but some people will argue otherwise.

I think JoeD is laughing a bit because you are behind the times on your research..

JoeD · 10-08-2009, 03:36 PM

Quote:

Originally Posted by RCZ

You used to have to let turbos cool down by idling the car a little bit before shutting it off, but that is no longer necessary with today's turbos. Turbo timers really arent necessary nowadays, but some people will argue otherwise.

Exactly!

I was laughing more so because he brought up having to idle down as if it was an issue which needed to be bought up.

Turbo-timers are the most useless devices I can think of. Are you ever in that big of a hurry where you need to shut your car off and walk away immediately after a few hard, full-boost pulls? It's advised to "cool off" any car by idling after running it hard, not just turbocharged cars. Also, as mentioned above, coked bearings are a thing of the past. You have nothing to worry about with modern turbos, with advancements in oil to boot.

Here's a thought...how about you refrain from going WOT or running the car to above normal operating temps 2 minutes before you reach your destination? I was under the impression that this was common sense...

K...enough about this non-issue.

Modshack · 10-08-2009, 03:42 PM

Quote:

Originally Posted by JoeD

Exactly!

Turbo-timers are the most useless devices I can think of.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Official 370Z 1/4 mile Times thread (Stock, TT, Nitrous, Supercharger, Bolt ons etc)	AK370Z	Track / Autocross / Drifting / Dragstrip	618	08-16-2019 12:56 PM
GT Motorsports: 370Z Stock block testing, and turbo system development	George@GTM	Forced Induction	314	07-26-2012 08:58 AM
Vortech Supercharger Development	Minicobra1	Forced Induction	124	02-02-2010 03:59 AM
GT Motorsports 2.5" True Dual Cat-Back Exhaust system.	George@GTM	Drivetrain/Engine	24	04-27-2009 06:32 AM