My dyno guy commented that all Nissan tachometers are a couple hundred RPM optimistic and, comparing the tach to my Apexi NEO, that statement appears to be true. I've also noticed that my JWT ecu redline of 7200 kicks in at an indicated 7400 on the tach.
I hadn't really thought about the speedo until last weekend when I did a PDX at Road Atlanta. I'm running a DOHC cluster with the digital speedo but the car is built from a mish-mash of E/DE/S13/S14 parts I've collected and I don't really know what the speedo sensor came from. Anyway, I had a blast at RA but found it harder than I expected to hit the 95MPH limit on either the front or back straight (?) I just got around to unloading the car yesterday and put the stock wheels back on for some testing. I took it for a ride and the speedo indicated 62MPH at the rev limiter. My calculator says that I should be at 68MPH at (7200 on the NEO) on stock size tires. If it's 6MPH low at that speed it would be almost 10MPH low at 100MPH. I know most speedo's are 2-3% high to protect us from ourselves but mine is about 10% low. Is it common to be off this much or do I have the wrong speed sensor in my transmission? I'm running the stock 4.08 final drive.
I hadn't really thought about the speedo until last weekend when I did a PDX at Road Atlanta. I'm running a DOHC cluster with the digital speedo but the car is built from a mish-mash of E/DE/S13/S14 parts I've collected and I don't really know what the speedo sensor came from. Anyway, I had a blast at RA but found it harder than I expected to hit the 95MPH limit on either the front or back straight (?) I just got around to unloading the car yesterday and put the stock wheels back on for some testing. I took it for a ride and the speedo indicated 62MPH at the rev limiter. My calculator says that I should be at 68MPH at (7200 on the NEO) on stock size tires. If it's 6MPH low at that speed it would be almost 10MPH low at 100MPH. I know most speedo's are 2-3% high to protect us from ourselves but mine is about 10% low. Is it common to be off this much or do I have the wrong speed sensor in my transmission? I'm running the stock 4.08 final drive.
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