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      08-01-2017, 02:27 PM   #1
LGCubana
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How much is too much e85 for stock pumps

As I've been following the custom tune threads, I've seen it repeated (over and over again) to be mindful of not exceeding the e30 ratio, without monitoring your stock fuel pumps.

I understand the logic. As you require more octane, more fuel has to be injected.

My question: is it the mere presence of a higher e85 mix that will put the demands on your fueling system or is it more so the tune ?

For example: I'm on the MHD, N55 Stage 2+ 93 oct. If I were to exceed the given ratio for e30 by a couple of gallons, would the DME request more fuel than the MHD map dictates ?
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      08-01-2017, 02:34 PM   #2
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You need more fuel when running ethanol because it has a lower energy content than that of gasoline. Your stock fuel system can't put out the flow required by the engine when running more ethanol. I may be mistaken but I think you would see your STFT max out positive and your pump pressures would decrease. Depending on weak link would be LPFP and/ HPFP. The only way to tell is log and log again. It depends on your the age of your pumps and ethanol content.
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      08-01-2017, 02:44 PM   #3
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some people have gotten lucky with more than e30 (me), some have had issues with e30 also. i'm up to almost e50, my fuel pressure is good from my logs, 1900+ as soon as boost comes in and stays above 2k to redline. my stfts are good on the light negative side. i'm running mhd e30 map. plugs are 95770 gapped to .019-.02.

like blueee92 said, log your runs, and do it for a few days, different temps, back to back runs, just to see if there is any moment that it drops. start at e30, keep increasing until your car feels right and logs look good.
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      08-01-2017, 05:06 PM   #4
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Depends on the car and how healthy is your fuel pump. Only way to know for sure is by datalogging
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      08-02-2017, 07:59 AM   #5
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Honestly not saying this will work for you but 2 years ago my car wouldn't handle E30+ on the stock pump. I went to ebay I bought a $99 full drop in Chinese made fuel pump. I was going to use it as the core for a stage 2. Instead I said what the heck i have some time I'll install this cheapo see what happens. Here I am 2 years later I run E60 not even close to being maxed out via my logs. Honestly my hpfp is maxed out on the ethanol content and my lpfp has 0 issues with it and my hpfp is only 2 years old also. I run 22 psi midrange here is proof of this here... http://www.n54tech.com/forums/showthread.php?t=48434
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      08-02-2017, 10:20 AM   #6
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Quote:
Originally Posted by mightbaal View Post
Honestly not saying this will work for you but 2 years ago my car wouldn't handle E30+ on the stock pump. I went to ebay I bought a $99 full drop in Chinese made fuel pump. I was going to use it as the core for a stage 2. Instead I said what the heck i have some time I'll install this cheapo see what happens. Here I am 2 years later I run E60 not even close to being maxed out via my logs. Honestly my hpfp is maxed out on the ethanol content and my lpfp has 0 issues with it and my hpfp is only 2 years old also. I run 22 psi midrange here is proof of this here... http://www.n54tech.com/forums/showthread.php?t=48434
Hey, very nice. i see a throttle closure early on looks like timing correction on cyl 1. what are you stft like? i didn't see that column

oh do you have the link to the FP you purchased?
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      08-06-2017, 04:48 AM   #7
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Whats stft? The pump can be found on ebay they are just the cheapo chinese made...

http://www.ebay.com/itm/Fuel-Pump-Fo...lZIHMd&vxp=mtr
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      08-06-2017, 12:06 PM   #8
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Quote:
Originally Posted by mightbaal View Post
Whats stft? The pump can be found on ebay they are just the cheapo chinese made...

http://www.ebay.com/itm/Fuel-Pump-Fo...lZIHMd&vxp=mtr
Oh stft is short term fuel trim. So u can see how lean or how rich the car is running.
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      08-06-2017, 07:36 PM   #9
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Quote:
Originally Posted by Blueee92 View Post
You need more fuel when running ethanol because it has a lower energy content than that of gasoline. Your stock fuel system can't put out the flow required by the engine when running more ethanol. I may be mistaken but I think you would see your STFT max out positive and your pump pressures would decrease. Depending on weak link would be LPFP and/ HPFP. The only way to tell is log and log again. It depends on your the age of your pumps and ethanol content.
I get mildly negative stft but do drop below 50psi briefly on e40 map with shell 93 and Kroger e85 12/4 respectively.
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