Big Turbo 3-Rotor RX-7 Spitting Flames on the Dyno!
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- เผยแพร่เมื่อ 23 ธ.ค. 2024
- We took the RX-7 to the dyno to properly break the engine in and see what kind of power it put down. It didn't go exactly as planned...
Things to check out:
omdsandiego.co...
Time Stamps:
Intro
Exciting to see his car running🎉🎉
Definitely! The pure joy and childish sense of wonder on his face makes it worth it!
Wow! You guys do some amazing work! The way it pulled at the end. Can't wait to see it full power.
Thank you! Can't wait to get this thing boosting the right amount and pulling all the way to 8000rpm
The faint crackle/pop sounds during pulls (5:33 , 5:38, 5:57 , 6:02) sounds like some sort of breakup or misfire to me. I would go back and look at ECU datalogs, the thing to watch for is quick upward spikes in the ECU's measured EngineSpeed trace. For instance, if the measured RPM increases faster than the engine could actually accelerate that is usually because of noise picked up on the ECU's crank input wires. The engine might be able to go from 3000 to 5000 in 1 second or 0.5 seconds, but probably not in 0.1 second and definitely not in 0.001 second. If you're unlucky, the ECU might do something dumb like trust an unrealistic crank input signal and fire the ignition coils early enough to damage engine internals.
If you're lucky, those crackle/pop sounds might be something less dangerous like spark blowout from some ignition coils that aren't getting the full 13V-14V power due to insufficient wiring or grounding. Or a coil or injector harness wire with a loose connection, but a loose connection should shake loose at light load and idle and I don't think I'm hearing that in the video. Good luck, I think troubleshooting problems in a safe and efficient manner is what separates the excellent builders from the good ones. It's really difficult to find and fix a dangerous problem before it causes harm.
Thank you for the information! The car is also running massively rich in the higher RPM ranges because of the overboost issues. The wastegate will be re-run to atmosphere and the exhaust upgraded from a 3.5" to a 4" system to drop exhaust pressure and hopefully stop the overboost issues. Then we'll take it back to the Dyno and test it again!
@@omd_sd good luck, someone posted a link from rx7club and it looks like a fun project. I was taught to start with part-throttle sweeps on the dyno before full-throttle sweeps, for instance run sweeps at 20%, then 40%, 60%, 80% before 100%. Part of the idea is to use the light load cells to make good predictions and not need to abandon dyno pulls from running lean in the high-load cells. Also if there are fuel system problems or misfires or overboost conditions, it's safer to encounter those at part throttle than to encounter them at full throttle when the car is making lots of power and lots of heat.
@@scotty305 Thank you! and yeah that makes sense, we'll see how it goes with some exhaust changes to the car!
Nothing sounds like a Wankel!! Well done guys!!
And I love the starter on the roof!!! 👍
Thank you! The starter button is very Top Gun style haha.