^^^
You're about 3 years too late on asking that question. |
Thanks for your RESPONSE.
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The answer to the question is that the engines are the same. 4 ports are 4-ports, and 6-ports are 6-ports. It is just the advertised power measurements have "changed".
Cheers, Hymee. |
Originally Posted by Wildcard
... Understanding and controlling the ECU seems to be the key to reliable performance. ...
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Originally Posted by Wildcard
I recently did a 3200km road trip, mostly in remote parts of Australia, so I had plently of opportunity to look at the top speed of my RX-8 under different conditions. Here is what I learned:
Over time the long term fuel trim (LTFT) in my car seems to gradually creep up. It was at 11% at the start of this trip. The result was that above (160km/h) 100mph, AFR's were pig-rich (<0.75). This not only effected fuel economy, but also max speed. Under this condition, I only got a max speed of 205km/h. Running that rich must really kill the power. Seeing this, I reset the ECU by disconnecting the battery, and immediately my AFR's leaned out by 10%. My top speed also increased to 216km/h. As the trip progressed, I found that the LTFT would stay at 0 for about 3 hours max, and then it would start increasing gradually - first 2%, then 5% etc. This also resulted in the AFR's becoming richer and economy getting worse. In all I reset my ECU 3 or 4 times during the trip to reset the LTFT back to zero. Note that these AFR problems only seem to be an issue in Closed Loop. I have found that the cruising speed needed to be in closed loop varies - anywhere from 130km/h to 160km/h. So most people aren't going to encounter this LTFT problem at all. Unless you are trying for max speed. I have no idea what criteria the ECU uses to adjust LTFT. The second thing about top speed is that I think wind direction and speed make an pretty big difference. On this drive, I had headwinds all the way, and the fastest my car ever got to was 220km/h. 6 months ago in exactly the same configuration, it got 240km/h with a slight tail wind. You must have something broken, maybe the new recall problem? maybe the cat? |
220 was into a head wind (i.e. doing it tough).
240 is his best, with documented evidence ;) Cheers, Hymee. |
Hymee,
Do you plan on putting this engine back into a RX and dynoing it at the wheels or have you already done this and I just missed it? Do you plan on testing a second engine to see if there is discrepancies. One engine test is not a good representation of all rotary engines. Please don't take this wrong, I really like what you're doing and hope you can capture even more data on this engine. It's nice to see real data that is documented. |
Thanks Raptor.
No plans to test multiple engines to see if there is such discrepencies. I would think (cough, "hope") that there would not be much physical discrepencies between fairly precision made components that would equate to more than a couple of HP, if that. It ain't like the parts are made in the back-yard or anything :) The aim is to baseline with this engine, then test power enhancements against a stable baseline. Cheers, Hymee. |
Any updates on this front?
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Two full months with no news about this topic!!!
anything to say Hymee? Cheers jird20 |
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