r12 to r134a conversion question

[jrd1990zr1]

I recall that I read somewhere that it takes less R134a to charge the system than R12. Does anyone have information on the amount of R134A is needed for a full charge in a 1990 ZR1 AC system?

Thanks

[-=Jeff=-]

I thought it was around 75% of r12

[dredgeguy]

I checked with Marc Haibeck as my system was changed to R-134a. His response:

The refrigerant is measured by weight. It should have 1 lb. 14.6 oz of R-134a.

Hope that helps