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Messages - Jeremy Belcher

Engine Tech / Re: Cracked Radiator Fan Blades
The Mustang fan may work, but it's not a direct interchange. Dorman has no way of knowing what other differences there are between the vehicles.
Engine Tech / Re: Dyno'd the 331
Lots of tuners delete the O2 input...
Lots of tuners do lots of stupid things (I'm not implying Aerocoupe 's tuner is stupid).

Deleting the rear O2s is common (in applications that have them), as they don't affect performance/drivability - they just let the user know when the cats dead.
Nobody even knows their O2's are out of range unless they test 'em....or a new(er) vehicle throws a light or code...
The front O2s in closed loop (>99% of time spend driving) help fuel efficiency, drivability, and emmissions.
As long as the trim is +/- 25% of  nominal, the O2s can get the AFR back to stoichiometric for good fuel economy without bucking.

Going Open Loop 100% of the time is generally a strategy used when properly tuning the vehicle is too hard or time consuming. Instead of really nailing down the MAF table or SD tables, you can specify OL 100% of the time, richen the mixure a bit over stoichiometric and just take the mpg and emissions hit.

Aerocoupe might have some insight as to why his tuner went full OL tune, but I've never seen a good reason (for me) to go that route.
Misc Tech / Re: R134 with HR980 Compressor
Just to add more information:

Freeze 12 is 80% R134a and 20% R142b. The R142b is to make it miscable with the mineral oil. (R134a isn't miscable with mineral oil [it's like oil and water, compressor would oil starve]) You can use Freeze 12 as a substitute for R12 without changing the oil. However, head pressure will be similar to R134a - not a good idea for the HR980.

Misc Tech / Re: R134 with HR980 Compressor

I'd get the HR980 and run R12 - not Freeze 12.

Is also get a new condenser to replace you current one if it's still tube/fin. That'll lower head pressure and improve performance. Not sure you can handle the visual difference though.

When you replace the compressor, replace the lines as well and have blow out the evaporator and condenser if you don't replace it. Since you have a leak, you've also leaked oil (and there is no way to know how much) so removing all the old stuff and starting from scratch is the correct way to do it.

That'll get you another 10-20 years out of it.
Misc Tech / Re: R134 with HR980 Compressor
Get the '85 setup. Need a new P/S hp hose. Need new compressor suction/pressure hoses. Easy peasy. The FS6 or the 6P148 both fit the bracket.

Also, you can still get R12, so just use that until the compressor grenades.

Edit: Looks like R12 is ~$50/lb on ebay.