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Originally Posted by nothere
help me out, I would have though the low afr (11.)would have meant you needed more timing to compensate for the slower burn. Was timing automatically adjusted to make max power during each run?
470rwkw on 11.0:1 AFR 12 deg timing 34psi boost
470rwkw on 12.5:1 AFR 12 deg timing 34psi boost
471rwkw on 12.5:1 AFR 18 deg timing 34psi boost
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maxtiming at full power as listed on tests.
another example of timing was from a friend of mine in norway (frode) not sure if he posts here or not? but i gave him some proven parameters for setting up his WI and on pump gas.
he has a max spark lead of 13deg @ 580bhp level as recorded on engine dyno, advancing spark another 2 degree's only net'd 4bhp increase in power, afr from memory was 11.0:1 region??? from my years of experience and track data i know rotaries dont pick up any noticable gains with greatly increased spark lead (again application specific) but they do have a great tendency to deposit apex seals in the turbine housing if you go for what should work out of a text book
his EGT was 840 to 850deg c pre turbine too.
we have other cars here that dont run WI at all (i want them too!) and on C16 race fuel need to run 10.5:1 AFR to live @ 36psi and only use 10 to 12 deg of advance, cars hold records in their class and infact beat others with much larger engines (12a v's 13b & 20b !) run 160mph in 0-400m test.