08-12-2019, 02:22 PM | #23 | |
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08-12-2019, 02:23 PM | #24 | |
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There are very distinct geographic areas where this is an issue. Arizona, California, Nevada, Pacific NW, and Canada. It must be the gasoline formulation. |
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08-12-2019, 03:15 PM | #25 | |
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Going from 0.86 lambda (typical MBT lambda on an efficient NA engine) to 0.89 in a highly tuned NA engine at max power can mean the difference between full power and melted pistons when you are pushing over 30 degrees of advance, potentially up to 40 degrees at 7500RPM. With a medium boost turbo engine 0.75 to 0.78 lambda can make a major difference at max power. This is the sort of difference E10 can make if not properly accounted for in fuel flow. Last edited by aerobod; 08-12-2019 at 04:30 PM.. |
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08-12-2019, 04:46 PM | #26 |
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Oddly enough on these cars quite a few people have cleaned up their timing by running E15-20 on the 91/93 maps. The knock resistance of the ethanol seems to help sort out the issue. I was skeptical that this was wise given the differing AFR, but the tunes run so rich (12:1) at high RPM that it doesn't lean out.
I ended up running boostane with Husky 94 to get clean timing and no knock on the 91 OTS map. On the GTR forums guys compare our 94 to Cali 91, for whatever that's worth. |
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08-26-2019, 11:09 AM | #27 |
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Seems to me that the reasonable thing to do is to ask for a tune for "Canadian" fuel formulation from the tuners - i.e. something with richer AFRs? Part of the problem here is that your typical modder expects a plug and play system, and don't understand that the manufacturer specs the 99.99% safe scenario, while most tunes are probably more around the 95% safe scenario. There's no free lunch - the extra power comes at the cost of decreased safety margin.
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