Quote:
Originally Posted by Irace86.2.0
Agreed. I am technically at the beginning of the red, but I don’t think there is concern at all running 12 psi @12.5:1 on E85. It isn’t an issue on pump either with a progressive boost like a SC. There is more risk to the rods from torque than from preignition on my stock motor, so I was surprised the guy has a built motor, but is only running 10 psi on E85. That seems overly conservative. I think it is even too conservative on pump gas because of the built motor.
That chart might be old like before direct injection and high compression engines were more prevalent. It definitely doesn’t apply to built motors on race fuel.
I know lots of people do built motors with modest goals, or they do it for security or insurance, but I couldn’t resist more boost if I had a built motor. I would run progressive boost, boost by gear, dual boost maps and boost by ethanol level. Like couldn’t he run a lower boost map for 91 or when the flex fuel is closer to E10 and run a higher boost map when it is over E45 or something? Like I’ve seen plenty of setups that automatically switched to ones that had a toggle or button to people running manual boost switches. Is OFT tune the problem for him?
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the guy also has an openflash and its limitation, and stock injectors with FI and e85(and its limitations!!) but also uses 91
With e85 we could definitely (with an eye to the PI opening time and the use of a little leaner afr) add an ebc and raise the boost despite the high compression ratio, but the problems come out when he switches to 91
It needs quite a richer afr (even if e85 requires at least 20% more fuel compared to e10, that becomes a problem anyway because PI is still to extreme uses) to cool things up and PI becomes maxed out and it requires too much of a reduction in ign timings that, other than being TOO much of a reduction, it basically knocks randomly in an uncontrolled way. And i had no way of reducing further timings against higher gears
Give me his tune again, with a bigger PI and an ebc hooked into Ecutek instead of OFT, and better things come out
I think CSG Mike can imagine the pain in the ass this sitaution and the use of openflash (so no ecutek tricks) to tune this car in particular is
Most tuners wouldnt even start to tune a FI Flex car that has stock injectors... and they REQUIRE ecutek
Trying to maximize performance is cool but i surely don t try to do it in this situation... at least he won t bend a rod while he enjoys a perfectly running flex turbo Frs, and in the meanwhile he can upgrade injectors and switch to ecutek