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At least he posted the result ................ that's a good thing.
The only slight saving grace would be if that was a particularly pessimistic dyno and the 'stock' dyno was of a strong Renesis. But yeah ,I agree, not looking good.
it reminds me of the before-after BHR long tube header dyno graph where the “stock” exhaust did 114 whp and then 155 whp with the “header”. Does that mean a 200 whp RX8 will also see a 36% whp increase? I do recall one person here did a serious new engine build using the header that then posted a 221(?) whp dyno, but there never was a dyno run made without the header. That said, there are plenty of 200+ whp dyno graphs posted on this forum and “stock” Rx8s dyno’ing 170 - 180 whp are a dime a dozen.
no, the only evidence on display here is how it reveals the inability of some people to properly discern truth
again, I posted up results that can then be directly used to evaluate the actual vehicle performance. We don’t need to be going through any of this malarkey. I’m not saying that anyone is being intentionally untruthful.
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only for those who were reading into it otherwise, or in some cases; as usual, also not implying that to anyone in particular either
and also because I didn’t write further to explain what it really means. At which point then some people become offended, again not implying that to any particular person(s)
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so over a year later it’s finally built, found it enlightening that he mentions that this as only the 2nd hybrid Renesis he’s ever put together, the first one being on the MotoIQ hybrid from back in 2009 but he also says that he’ll run it NA first, when we finally see some results may depend on how much longer you it will be milked …
and just to back up what I projected for merchandized cost level put into such a build, from the KMR website:
in general though his prices are reasonable imo and I’d completely trust him to build pre-Renesis 13B & 20B engines, but wouldn’t waste one penny on this hybrid nonsense.
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so I wonder how many people read the first post in this link and really understood what was stated there by an extremely knowledgeable Renesis “expert”:
particulary the part about side exhaust ports and carrying exhaust gasses over into the intake cycle. Because one of the things done on this engine; as I pointed out previously, is he employed a 13B technique to the Renesis rotors by machining the tip sides down, increasing the cavity between the rotor tip and the side plates for those gasses to fill and lessening the restriction for those exhaust gasses to then take that path. Which is in addition to the peripheral exhaust port and resulting overlap that is going to further exacerbate more of same.
Here is Dyno sheet
Solid line is 13B MSP Exhaust PP
Dot line is stock 13B MSP Attachment 285622
For reference ..... I dynoed a race prepped Renesis on the same dyno type (Dynapack hub dyno at Dtech in Tauranga NZ ) yesterday . We made (after a fair bit of messing about) 211whp and the line looked just as wiggly and much the same as the line for the stock Renesis above.
Just remembered I had this on my phone . This is same dyno mentioned in post above but done last year on a different engine.
What's really interesting here is that all these runs were done on same day. A couple of things we did made a difference:
1/ Best results were obtained after removing BHR coils (on stock dwell) and replacing those with stock coils. But one of the lower results also came with the stock coils.
2/ Best results came after an extended period of load was placed on the engine and run followed immediately . IE gearbox/diff heat soaked but LIM was nice and cool .
I'm not 100% sure if one of those two things actually gave us the best result or whether it was just the engine improving after bedding in that did it. But I lean toward it being the heat soak/cool intake having the most influence.
Also:
The engine I dynoed yesterday also originally had BHR coils on stock dwell and results improved after removing those (along with cleaning LIM and replacing SSV ).
Brett,
Were the BHR coils you mention the old style GM derivatives, or the new style "global" BHR coils?
Not sure on that sorry. I think on the first engine (from last year) they were the old style but wasn't really paying attention when they were taken out. On the second one from a couple of days ago .... they were removed before we got on the dyno. The car had been dynoed earlier and the results weren't good enough so I suggested the coils could be a problem. He just swapped them out rather than mess with them any more. But he also removed the LIM and cleaned it out and replaced the ssv at the same time. When we redynoed ( with me present this time) it had gained enough power for us to conclude that the problem had been fixed.
to be fair, you’d really need to break out the spark tester and check to make sure they all pass first and then do a before and after run. Plus the intake cleaning throws a wrench in on that one. Nothing really to claim one way or the other it seems.
10-27-2022, 04:17 AM
and the information posted in this thread clarifies it as such.
