so, stock block??
The block is kinda a moot point. It won't be the limiting factor here.
You'll need about 40% more fuel flow at WOT than an equivalent gasoline engine. You typically tune E85 to be a bit richer, hence you'll want even more flow. It runs more happily under rich conditions than gasoline and does.
So some back of the napkin calcs... whatever the limit of a 42lb injector on gasoline is, that's probably your limit on E85. So around 500rwhp it looks like?
As you can see, you'll want more injector if you are planning to run more boost. On the turbo forms I frequented before (2.3T), they would typically run 90-120lb injectors for E85. that would ensure you have plenty of capacity without too much difficulty tuning for lower flows.
As for the fuel pump... It wouldn't surprise me if you quickly approach the limit of that 310lph pump too. I kinda recall the 255lph pump was good to 400-450rwhp on E85, so your 310lph may only be good for 500rwhp.
Not much reason to run E85 unless you make the tune more aggressive to take advantage of it. Fewer stations have it, it'll cost a little more per mile than pump gas and you'll be stopping more often for gas. But with 105 octane and a really nice cooling effect, you can really turn up the wick.
I run E85 in my supercharged 2012 mustang. Here are my thoughts on this.
I think you will run out of fuel. I have a return-style fuel system on my 12' and i suggest switching to one with larger fuel pumps (I have twin walbro 465lph ones). The aviator pump might not like e85 too. Walbro 465lph ones work well with e85.
Also, e85 ruined a few o2 sensors on my car because of the way they were positioned in the header. If your sensors are horizontal with the ground, you will most likely have issues with moisture (from the fuel) getting into them and ruining them. Thus, making your car run like crap. If the sensors are more vertical to the ground, you will be fine. I'm not sure this is a problem on new edge cars but better be safe than sorry.
e85 requires around 20-30% more fuel, not 40%.
E85 moisture also gets into your oil and dilutes it. You need to heat up your oil, run your car hard, to burn off the oil.
and cold starts are not an issue and e85 is kinda iffy to get right when trying to tune the driveability of the car. It's not like a 93 tuned or race gas tuned car.
I use the gas because it reduces detonation and is a safety net. You WILL be fine if e85 tests out to E70 or up(minimun of 70% ethanol). E70 has all of the detonation resistant stuff that E85 does so no worries there. If the gas is diluted down past E70, then you will have trouble with detonation.
Also, him having a stock block has nothing to do with anything. The actual blocks are pretty strong. The internals are where problems come from.
Forgot I was in the modular section and not the 5.0 section - LOL on the block comment.
If it's testing out at E70, the worry is the octane. If you're tuned on E85 and you fill with E70 and don't test it and adjust the tune accordingly, kiss your fancy new forged pistons goodbye.
What, if he leaves 6 degrees of timing out of your E85 tune "just in case" (and therefore a ton of power and throttle response)?
If you have a spot on 93 tune and you go fill it up with 87 and put a window in a piston, nobody is going to say your tuner "doesn't know how to tune."
...you are leaving something on the table without a retune...
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