The tests will vary depending on MANY MANY factors. Battery charge level/health (crank rpm), spark plugs in or out, number of cranks, engine temp, etc etc etc.. You cant compare yours vs someone elses to compare engine health. The numbers vary too much. The MAIN reason for a compression check to...
It will vary. Above 150 i think is what the manual (mkiv) calls for.
If you're looking for the health of the engine, I recommend a leakdown test. Its a better indicator on the engines health.
edit: and go to drift motion!
Yes it will fix the tach. The JZA70 tach runs from a signal directly from the ignitor (same IG- Signal in the Diag block) rather then the ecu's signal of the jza80.
What harness did you use? The MKIV Supra (usdm 100% sure, assume the JDM is the same) uses the ECU to drive the tachometer. What you need to do is run a wire from the IG- on the Diag plug (right by where the harness runs into the firewall on a usdm car) and connect it to the stock tach wire...
Heres a list of the ones i've had.
blue 91 - bought for 1k with a blown engine. had 74k miles on it. Put like 6k into it. Still have it, but its rusted fairly bad (used for parts here soon)
Dark green mica 91 - bought for 750, put like 8k into it (2jz, coilovers, wheels, etc) sold for...
ISC has a valve on it, seals off when the manifold enters boost.
make sure to check the timing at higher rpm though as well. My timing would sway 3-4* on my celica. Adjusted it per the manual and stayed solid throughout the rpm range.
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