E85 Tuning: Hot Startup Issues
Hello all. My setup is on E85 on my Z. I have been trying to figure out this hot start issue I am having with this fuel. With regular pump it was fine, now its a bit tricky to get down with a different fuel. Here are my Crank enrichment and Crank timing tables.
https://cimg3.ibsrv.net/gimg/my350z....06528b3c01.jpg https://cimg2.ibsrv.net/gimg/my350z....ec6ea44e40.jpg Pretty much anything above 140 coolant degrees is a heartbreaker to get started and I have to repeatedly pump the gas to get it going. Cold starts are perfect and always start the car after about 3 cranks on its own without pressing the gas. Any suggestions or advice would be much appreciated. Thanks for taking the time to read my question. |
I’m skeptical of E85 (due to my own ignorance) but I have heard hot start issues are consistent around the E85 community ... I’d research what has worked on other platforms and recreate on your map.
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Originally Posted by bealljk
(Post 10926812)
I’m skeptical of E85 (due to my own ignorance) but I have heard hot start issues are consistent around the E85 community ... I’d research what has worked on other platforms and recreate on your map.
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Drop that cranking enrichment that’s at 100 to about 50. And see how it does
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or email me the tune and il make some cranking adjustments and send it back. 2bad240@gmail.com
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Originally Posted by 2bad240
(Post 10926875)
or email me the tune and il make some cranking adjustments and send it back. 2bad240@gmail.com
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Yea just try and cut your crank values down in the trouble areas and see if it helps.
That's what I did with mine but in regular pump. Tried everything until I found out I have to make -3 corrections on my lower table for it to crank like a normal car. If not I'm either cranking it for 10 min and WOT to get it to crank over. Note my adjustments were needed to compensate for 2x stock injector size tho. |
Feel free to ignore "cranking timing b" and "cranking timing c". UpRev has these defined and scaled incorrectly, they're actually cranking rotational energy compensation and cranking rotational energy compensation limit tables. And their values are much lower than it lists.
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Originally Posted by CK_32
(Post 10926946)
Yea just try and cut your crank values down in the trouble areas and see if it helps.
That's what I did with mine but in regular pump. Tried everything until I found out I have to make -3 corrections on my lower table for it to crank like a normal car. If not I'm either cranking it for 10 min and WOT to get it to crank over. Note my adjustments were needed to compensate for 2x stock injector size tho. Thanks or your comment. I am a bit apprehensive atm to do any changes on my own now. So I am working with 2bad240 to fix the issue. |
Originally Posted by Blizzard25
(Post 10927332)
Feel free to ignore "cranking timing b" and "cranking timing c". UpRev has these defined and scaled incorrectly, they're actually cranking rotational energy compensation and cranking rotational energy compensation limit tables. And their values are much lower than it lists.
Wow, I had no idea about that. Thank you for telling me. I wont concern myself with those tables as much now. |
With 2bad240's help with my crank maps, hot starts are a bit better now. I would crank on it forever once the engine was warm, but now it usually takes like 3-4 seconds with the gas pedal pressed repeatedly. I think this is as good as its gonna get for now. Thanks for everyone's assistance helping me figure this whole E85 tuning thing.
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What did you guys change?
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Originally Posted by CK_32
(Post 10927690)
What did you guys change?
We will continue to send logs back and forth in the future to further improve on it. |
Yea that's the same thing I had to change with mine for larger injectors.
Probably the same principle but opposite.. My injectors needed less fuel cause of the increase in size. You need more fuel due to e85 being less efficient than gasoline as far as unit per optimum delivery. |
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