E50 on 2020 Supra

[sa90h]

So I just bought a MHD license and all OTS maps. I see that there’s options for 91, 93, 95 octane and E40 and E85 but not option for E30. I have a 2020 Supra. Can the 2020s run E40 or even E50 on the stock fuel pump? Is there a different way in MHD to do E30? I know that they changed the option from E30 to E40, anyone know why?

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[bushido]

2020s can run up to E25 on stock ROM.
fuel system handles up to E52.

in MHD+ there's a flex fuel option, so if you'd like to run E30, you can! select E40 flex fuel map, turn on flex fuel, run E30

https://www.bimecu.com/product-page/mhd-can-flexfuel-analyzer-quickinstall-kit

however for E50 you'd need a custom tune

the why? i can't give you a technical answer. they decided that's what they wanted to offer. maybe @Twisted Tuning knows?

 

[sa90h]

Got it. Thanks!

 

[Bern77]

2020s can run up to E25 on stock ROM.
fuel system handles up to E52.

in MHD+ there's a flex fuel option, so if you'd like to run E30, you can! select E40 flex fuel map, turn on flex fuel, run E30

https://www.bimecu.com/product-page/mhd-can-flexfuel-analyzer-quickinstall-kit

however for E50 you'd need a custom tune

the why? i can't give you a technical answer. they decided that's what they wanted to offer. maybe @Twisted Tuning knows?

I was wondering if you know? I currently have BM3 stage 2 with a 91 tune. I do have the option to select E50 as well but I haven’t used it yet only because the Ethanol station is quite far. Is it bad to go back and forth from 91 to E50 like every other 2 weeks or so?

 

[bushido]

I was wondering if you know? I currently have BM3 stage 2 with a 91 tune. I do have the option to select E50 as well but I haven’t used it yet only because the Ethanol station is quite far. Is it bad to go back and forth from 91 to E50 like every other 2 weeks or so?

not bad at all. i'd recommend an ethanol content reader before you go ahead with that though

 

[Havoc5811]

So I just bought a MHD license and all OTS maps. I see that there’s options for 91, 93, 95 octane and E40 and E85 but not option for E30. I have a 2020 Supra. Can the 2020s run E40 or even E50 on the stock fuel pump? Is there a different way in MHD to do E30? I know that they changed the option from E30 to E40, anyone know why?

E40 is fine on your car, I run E40 in my 2020 all the time. I've been on E40 and 93 tunes on stock everything besides DP for 40k miles and have had no issues. Just get yourself a Ethanol reader it will make things much safer and easier when map swapping and running E. I did the P3 gauge which I like a lot and looks clean.

 

[Bern77]

not bad at all. i'd recommend an ethanol content reader before you go ahead with that though

Thank you

 

[tharris4995]

I have a m240i with the b58 in it, and I run bm3 with a ethonal kit tune, stage two. Without an ethanol kit and adjustable tune the car is going to run on a base tune set to a certain octane rating. As far as I understand the ots bm3 tunes are set to a certain octane and don’t adjust, but with a reader and adjustable tune you can put whatever octane you want and it auto adjusts the power to the contents of the incoming gas.

 

[xerolimit]

So I just bought a MHD license and all OTS maps. I see that there’s options for 91, 93, 95 octane and E40 and E85 but not option for E30. I have a 2020 Supra. Can the 2020s run E40 or even E50 on the stock fuel pump? Is there a different way in MHD to do E30? I know that they changed the option from E30 to E40, anyone know why?

You can run E85 if you want but you have to turn the boost down so much so that the power gains from the ethanol are less than the losses from lower boost. E40 is about the sweet spot, but you can go down a few percent if you are on good fuel and cooler temps. Realistically the difference for E25 vs E40 is about 6% in fuel demand, same for E55 vs E40. Most of the knock reduction happens around E40-E60 or so.

With all that in mind for most people a solid E30 tune is about the sweet spot, with maybe a lower power E40 tune for track use (road course) to keep temps down.

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