(Note: LANDRACING.COM donations are not tax deductible)


This is a public forum. The opinions expressed here don't
necessarily reflect the feelings of The Folks That Run The Site (that's us)
unless we explicitly say so, ok?


Author Topic: Turbo Cooldown  (Read 14264 times)

0 Members and 1 Guest are viewing this topic.

Offline n49racer

  • Full Member
  • ***
  • Posts: 105
  • Age: 67
  • Location: Standard, Alberta
  • Faster Faster
Turbo Cooldown
« on: August 07, 2016, 10:39:18 PM »
Hi All
This year I will be running turbos on my AA/BFRMR. I wondering about cooling down the turbos after a run. My thought is to try and keep the engine running for some minutes after the run but I not sure how long or if it's even required. I'm running non water cooled non ball bearing turbos. What do you guys with turbos do? Thanks

Ted
B/STR  209.97 best
B/RMR  248.45 Record Holder 2012
B/FRMR  248.85 Record Holder 2012
2 club member 2012

Offline hotrod

  • Hero Member
  • *****
  • Posts: 1231
    • Black Horse photo
Re: Turbo Cooldown
« Reply #1 on: August 07, 2016, 11:03:55 PM »
The only cooling that sort of turbo gets is from the oil flow and just a little from the air flow at idle. The problem is to cool it down enough that the oil in the bearings does not get cooked to tar or charcoal after the turbo shuts down. You are on the right track a couple minutes of low load idle to get the heat out of the scroll so it does not burn the oil, but will have to defer on a specific time recommendation since all my turbos have been water cooled.

The turbo buick guys usually say 30 seconds to a minute or two depending on how hard they were flogging the car before shut down.
Saab used to recommend a minimum 30 second cool down at idle before shut down on the Saab 9000 turbo.

With modern synthetic oils which have higher temperature limits than conventional oils used years ago it probably is less important than it used to be if you are running a premium oil.

You might put an oil temp gauge down stream from the turbo if your configuration allows, but 30 seconds to 2 minutes sounds like a good place to start.

The high power turbo diesel guys might have a better recommendation but that is what I recall on the subject.

Offline n49racer

  • Full Member
  • ***
  • Posts: 105
  • Age: 67
  • Location: Standard, Alberta
  • Faster Faster
Re: Turbo Cooldown
« Reply #2 on: August 08, 2016, 09:56:11 AM »
Thanks HOTROD, I was also thinking of an accumulator that would store pressurized oil then flow oil through the bearings for a time if the engine shut down. So far the keep the engine running theory is winning.

ted
B/STR  209.97 best
B/RMR  248.45 Record Holder 2012
B/FRMR  248.85 Record Holder 2012
2 club member 2012

Offline SPARKY

  • Global Moderator
  • Hero Member
  • ***
  • Posts: 6713
  • Age: 77
  • Location: Phoenix
Re: Turbo Cooldown
« Reply #3 on: August 08, 2016, 11:24:14 AM »
I am planning on an accumulator if I can find a place to mount it.
Miss LIBERTY,  changing T.K.I.  to noise, dust and RUST!!!

The # 1 issue is: TO KEEP THE REPUBLIC      
           tncsg.org     mrspowell.org

ELECTION  INTEGRITY  PROJECT
eip-ca.com  EIPAz.org  eipnv.

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller

Offline n49racer

  • Full Member
  • ***
  • Posts: 105
  • Age: 67
  • Location: Standard, Alberta
  • Faster Faster
Re: Turbo Cooldown
« Reply #4 on: August 08, 2016, 11:50:49 AM »
I'm with you Sparky. I would think a gallon would be required :-o I'd need a luggage rack.  :-D :-P

ted
B/STR  209.97 best
B/RMR  248.45 Record Holder 2012
B/FRMR  248.85 Record Holder 2012
2 club member 2012

Offline Stan Back

  • Hero Member
  • *****
  • Posts: 5133
  • Location: San Berdoo
Re: Turbo Cooldown
« Reply #5 on: August 08, 2016, 01:18:59 PM »
Just change to a Roadster Pickup.
Past Member of the San Berdoo Roadsters -- "California's Most-Exclusive Roadster Club" -- Fifty-Seven Years of Leadership  Is Enough

Offline Paul Powell

  • Full Member
  • ***
  • Posts: 60
  • Age: 46
  • Location: Red Oak, NC (outside of Rocky Mount)
  • Just too slow to go
    • Paul Powell Performance
Re: Turbo Cooldown
« Reply #6 on: August 08, 2016, 01:36:50 PM »
I have run turbochargers at Bonneville and drag racing for over 20 years and we do NO cool down at the end of any run.
First on a street car this is way more important due to the number of start and stops.  But with modern oil the build up is all but gone.
We have turbochargers that have made 15-20 passes at Bonneville and 20-30 at the ECTA along with 50 plus dyno pulls on zero build up on the turbochargers.

The build up is not going to be a problem with yours.   The bigger issue you have is cooking everything within 10 inches of the turbo chargers when you stop.  Running them only makes that worse.

make sure you shield everything near them!

Have fun and look for us on the salt.

Car 80
Paul Powell
Paul Powell Performance L.L.C.
5073 Barnhill Farm Road
Battleboro, NC 27809
(252) 452-4998

Offline n49racer

  • Full Member
  • ***
  • Posts: 105
  • Age: 67
  • Location: Standard, Alberta
  • Faster Faster
Re: Turbo Cooldown
« Reply #7 on: August 08, 2016, 02:06:12 PM »
Thanks for the info Paul. I was stressing over trying to keep the engine running for such a long time after a run but maybe if I can keep it running to the return road it will be fine. Stan, I just happen to have a roadster pickup sitting in the garage  :-D :-D :cheers:

ted
B/STR  209.97 best
B/RMR  248.45 Record Holder 2012
B/FRMR  248.85 Record Holder 2012
2 club member 2012

Offline Stan Back

  • Hero Member
  • *****
  • Posts: 5133
  • Location: San Berdoo
Re: Turbo Cooldown
« Reply #8 on: August 08, 2016, 05:48:35 PM »
. . . it's all coming back to me.  How could I forget!
Past Member of the San Berdoo Roadsters -- "California's Most-Exclusive Roadster Club" -- Fifty-Seven Years of Leadership  Is Enough

Offline robfrey

  • Hero Member
  • *****
  • Posts: 1206
  • Age: 54
  • Location: Butler, PA
    • carbinitelsr
Re: Turbo Cooldown
« Reply #9 on: February 16, 2019, 11:25:52 PM »
Yeah like Paul says, keep it running until you get it to the return road and just listen for it to come back to idle for ten seconds or so. Listening to how it idles is my first step in analyzing engine condition.


Rob Freyvogel
#496
AA/BFS
496 BGS
carbinitelsr.com
carbiniteracing.com
carbinite.com