December 13, 2018, 01:02:00 AM

Author Topic: Cooling turbo after car shut off  (Read 410 times)

Offline ZekeO

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Cooling turbo after car shut off
« on: July 23, 2018, 12:46:14 PM »
What's the best way to keep the fan running after the car shut off?

A capacitor? How much would be needed to run an average radiator fan for 5 mins?
'93 RX-7
'04 M3 Convertible

Offline jwvand02

Re: Cooling turbo after car shut off
« Reply #1 on: July 23, 2018, 03:09:52 PM »
Keeping just your rad fan running isn't going to do anything.

Most commonly you use a turbo timer, which actually just keeps the whole car running for a few minutes to circulate oil/coolant.

Offline spacevomit

Re: Cooling turbo after car shut off
« Reply #2 on: July 23, 2018, 06:29:40 PM »
Is it water cooled or just oil cooled?

Offline digitalsolo

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Re: Cooling turbo after car shut off
« Reply #3 on: July 24, 2018, 10:06:46 AM »
If you just want to run the cooling fan after key off, and you've wired your fan relay properly, it's a tuning setting in the ECU.
Blake MF'ing McBride
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Offline ZekeO

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Re: Cooling turbo after car shut off
« Reply #4 on: July 24, 2018, 09:20:14 PM »
Itís both oil and water cooled Garrett.

Thatís awesome to know that Megasquirt ultimate can keep
The fan on.
'93 RX-7
'04 M3 Convertible

Offline onefastrx7turbo

Re: Cooling turbo after car shut off
« Reply #5 on: September 27, 2018, 01:55:00 PM »
even running the fan will basically just cool the water in the radiator and likely will not have enough effect to cool the turbo. Many VW/Audi cars had small pumps run after the key is off to cycle coolant through turbos.
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Offline jwvand02

Re: Cooling turbo after car shut off
« Reply #6 on: September 27, 2018, 03:23:30 PM »
Itís both oil and water cooled Garrett.

Thatís awesome to know that Megasquirt ultimate can keep
The fan on.

If you're also running an electric water pump and can keep that on the same timer as the fan, you might actually be in business. Water has to circulate for it to have any significant cooling impact. But like I said, what you really need to use is a turbo timer, which is a purpose-designed thing for this exact application.

Offline digitalsolo

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Re: Cooling turbo after car shut off
« Reply #7 on: September 27, 2018, 04:31:08 PM »
At the end of the day, just don't beat on you car for 30-60 seconds before shut off.   Or if you're drag racing or whatever, let it idle for 30-60 seconds.    This is what a turbo timer does.   It's not hard to be a human turbo timer.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...  project car
2013 Focus ST3 - Stage 1 BPU

Offline Grumpy

Re: Cooling turbo after car shut off
« Reply #8 on: September 27, 2018, 07:41:58 PM »
At the end of the day, just don't beat on you car for 30-60 seconds before shut off.   Or if you're drag racing or whatever, let it idle for 30-60 seconds.    This is what a turbo timer does.   It's not hard to be a human turbo timer.

That what we do with our Buick V6 Turbos. no big deal. Even at the drags by the time you get back to the pits we shut it off.
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