edekalil Posted October 12, 2014 Report Share Posted October 12, 2014 I have a 72/510 that was origanaly an automatic the rest of the car is original except for the tires. They are mounted on some Celica 14" rims from about 1980. I do not think they are any taller than the original tires. What should my tack read about at 70 mph or 50 mph? Quote Link to comment
datzenmike Posted October 12, 2014 Report Share Posted October 12, 2014 Rim size does not matter, but tire size does. The rear end ratio is also important. Generally the N American 510 automatics/standards/sedan/wagons got a 3.889 rear end so I'll post the following using the stock tire 5.60 X 13" or 175/70R13 which is 22.65" diameter. RPMs in forth gear at 70........... 4,049 60........... 3,471 50........... 2,892 If this helps ..... 17.28 MPH for every 1,000 RPMs in 4th gear If your tires are larger diameter (not necessarily rim size) then these numbers will be lower If you should have a lower numerical differential gear ratio such as a 3.70, then the RPMs would be much lower. Quote Link to comment
edekalil Posted October 12, 2014 Author Report Share Posted October 12, 2014 Thanks Mike I needed that. My speedo is not working at the moment. Quote Link to comment
john510 Posted October 12, 2014 Report Share Posted October 12, 2014 Tire size affects Tach readings ? or did he mean to say speedo ? Quote Link to comment
67_1600 Posted October 12, 2014 Report Share Posted October 12, 2014 Tire size affects Tach readings ? or did he mean to say speedo ? Tire size doesn't affect the accuracy but with smaller tires you're going to be turning at a higher RPMs at any given speed. Quote Link to comment
banzai510(hainz) Posted October 13, 2014 Report Share Posted October 13, 2014 tire size dont matter if speedo dont work. Thats a clean sedan!!!!!!!!!!!! think you need to buff it out!!!!!!!! 1 Quote Link to comment
datzenmike Posted October 13, 2014 Report Share Posted October 13, 2014 My speedo is not working at the moment. As long as you have those stock tires that should work. Speedo cables are only $20. I think Rock Auto or NAPA still have them. Almost any '70-'79 car or truck will work. Dash end must be screw on... later were clip on. Trans ends were the same well into the late '80s. Length only matters if too short, (she said) you can always tie too much slack up somewhere. I used a 4x4 trans case speedometer cable for a while on my 620. It came up past the engine around the air filter over the rad and back to the firewall. Quote Link to comment
edekalil Posted October 15, 2014 Author Report Share Posted October 15, 2014 I should have couple of the ones NAPA sold way back around just have to locate one. Quote Link to comment
]2eDeYe Posted October 15, 2014 Report Share Posted October 15, 2014 It should read TACH as in tachometer. Tack is a direction, a pin or a type of weld. :) 1 Quote Link to comment
Guest Rick-rat Posted October 15, 2014 Report Share Posted October 15, 2014 Also equipment for horses, should read western books :angel: 1 Quote Link to comment
]2eDeYe Posted October 15, 2014 Report Share Posted October 15, 2014 Ah yes, short for tackle :) Quote Link to comment
bilzbobaggins Posted October 15, 2014 Report Share Posted October 15, 2014 rpm's? Quote Link to comment
edekalil Posted October 20, 2014 Author Report Share Posted October 20, 2014 It should read TACH as in tachometer. Tack is a direction, a pin or a type of weld. :) Well that's what I get for going to school in New Orleans. 1 Quote Link to comment
]2eDeYe Posted October 20, 2014 Report Share Posted October 20, 2014 Hey now, I went to Belle Chasse Elementary :lol: Quote Link to comment
datzenmike Posted October 20, 2014 Report Share Posted October 20, 2014 School of Hard Knocks, Ontario. Quote Link to comment
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