JMLegacy Posted January 24, 2013 Share Posted January 24, 2013 Doign a bit of research here. For the guys that tune, what's the difference in total timing on averge, between 91 and 93 tune? That's in the high load areas and assuming everythign else is equal load >1.32 (1.48+) Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted January 24, 2013 Moderators Share Posted January 24, 2013 subscribed because I'm curious. "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
JMLegacy Posted January 24, 2013 Author Share Posted January 24, 2013 OK, I asked as the difference in Timing in my stock map (for 93) vs a tuned one (91) is about 8 degrees :-/ Link to comment Share on other sites More sharing options...
iNVAR Posted January 24, 2013 Share Posted January 24, 2013 err stock map is setup for 91 octane. and also lower boost... edit: ah wait, you have a non usdm. never mind. dunno what your minimum octane is supposed to be. Link to comment Share on other sites More sharing options...
JMLegacy Posted January 25, 2013 Author Share Posted January 25, 2013 Yeah, stock map is 93. My best gas is around 90 I did some more readings and now learning about the combination of boost, fueling and timing that will give the end result. But lemme ask, if I should advance or retard timing a (2-3 degrees) would that be a noticeable change in performance? I guess that answer depends on fueling and boost :-/ CR is 9.5:1 on this engine! Link to comment Share on other sites More sharing options...
ehsnils Posted January 25, 2013 Share Posted January 25, 2013 I think that I did answer this a while ago - that for the low octane rate (90) that is available the compression ratio of a turbo engine (8.5:1) is about what can be handled by the engine without boost to avoid knocking. And changing the timing will result in less power, so it's either no boost or boost with bad timing. So what's needed is some way to improve the octane rating, like adding Ethanol or octane booster. Or a water/methanol injection as soon as you start to go into boost. Unless you can get E85. But you may need to change injectors to be able to run E85 since the air/fuel ratio is different for E85. And looking further into the fuel alternatives for your location I suspect that you would have been way better off with a diesel. Link to comment Share on other sites More sharing options...
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