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06-08-2019
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#1 |
 Join Date: Apr 2018
Location: Raleigh, NC
Posts: 40
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Freon capacity for 91 ZR-1?
I've been all over the web, and for whatever reason I can't seem to get an answer as to how much refrigerant (R12) my 91 ZR-1 will hold. I've checked the various stickers under the hood, none of them show a Freon capacity.
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1991 ZR-1 #769 - Turquoise / black - DRM 475 - 1993 Mustang - White / Black - Twin Turbos - Other Stuff - |
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06-08-2019
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#2 |
Join Date: Oct 2017
Location: TX
Posts: 2,034
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Re: Freon capacity for 91 ZR-1?
Have you checked your FSM? Pretty sure it's in there.
Mine is a '90, but I'll look in my book when I have a few minutes. 
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Kenny 1990 #442 
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06-08-2019
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#3 |
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Join Date: Apr 2018
Location: Raleigh, NC
Posts: 40
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Re: Freon capacity for 91 ZR-1?
My FSM is tucked away in the attic with the other top to the car. I need to just go get the ladder and bring the FSM down - it doesn't do any good to anyone up in the rafters.
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1991 ZR-1 #769 - Turquoise / black - DRM 475 - 1993 Mustang - White / Black - Twin Turbos - Other Stuff - |
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06-09-2019
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#4 |
 
Join Date: Apr 2007
Location: Northern VA
Posts: 2,659
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Freon capacity for 91 ZR-1?
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake Last edited by Jagdpanzer; 06-09-2019 at 01:39 PM. |
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06-09-2019
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#5 |
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Join Date: Oct 2017
Location: TX
Posts: 2,034
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Re: Freon capacity for 91 ZR-1?
Sorry for the delay in getting back.
My '90 FSM shows 2.25 lbs of R-12.
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Kenny 1990 #442
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07-06-2020
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#6 |
Join Date: Jul 2013
Location: Central Iowa
Posts: 190
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Re: Freon capacity for 91 ZR-1?
Bringing up an old thread. So for my '90, it is 2.25 pounds of R12. Does that convert straight across for R-134? I'm wondering since the R-134 is less efficient if it needs more or the same amount?
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[CENTER][SIZE=4][COLOR=red]1990 ZR-1 Red / Red[/COLOR][/SIZE][/CENTER] |
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07-07-2020
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#7 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,167
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Re: Freon capacity for 91 ZR-1?
Quote:
Typically R-134a is about 75-80% of the R12 fill. reason the later cars are at 2lbs vs 2.25 is the added capacity of the parallel flow condenser vs the tube and fin condenser
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-18-2024
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#8 | |
Join Date: Dec 2005
Location: Delanson, NY
Posts: 915
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Re: Freon capacity for 91 ZR-1?
Quote:
Sorry I know this is an old thread. So if one is converting their 1990 ZR1 to R134a the charge should be between 27 oz. and 28.8 oz., correct? Do you know what the proper high side and low side pressures should be? Thank you.
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1968 convertible Lemans Blue, 1986 coupe Medium Blue NCRS Top Flight (sold), 1990 ZR1 #2529 Red NCRS Regional and National Top Flight (sold), 1990 ZR1 #2124 Charcoal Metallic NCRS Top Flight 2010 & 2018, 2003 Anniversary Red Convertible (sold) |
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07-06-2020
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#9 |
Join Date: Sep 2018
Location: Groton, CT
Posts: 382
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Re: Freon capacity for 91 ZR-1?
Only 2lbs for R-134a.
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1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2018 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige |
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05-18-2024
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#10 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,167
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Re: Freon capacity for 91 ZR-1?
Yes that is correct..
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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