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Howdy,
Trying to get more guidance/suggestions when talking about switching over to E-85. A little more context, I have a 2012 CTS-V Sedan with some modifications done (Exhaust, Headers, Cam, Under Hood Heat Exchanger Coolant Reservoir/Ice Tank, and DSX Auxiliary Flex Fuel Kit) Had the car dynoed and tuned In Colorado and made 606 Hp on pump gas running on 91 octane. Asked my tuner if i was able to run E85 and he said from what he seen i should be able to. Just wondering what else i would need before switching over to E85 if anything and the types of benefits there are when switching over. As of right now i am tracking i only have a stock fuel system. Any additional info helps!
Thanks y’all!
-Eleazar
 

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2011 CTS-V Coupe with a blue wrap. Cam, smaller pulley, larger injectors, methanol injection.
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Benefits? Increased timing and more horsepower. You will have to increase your injectors and probably add another fuel pump. E85 uses about 30% more than 91 octane. I don't know where you live so I don't know how easy it is for you to fill up. I personally have to fill a 30 gallon tank and five, five gallon tanks for my supra. The closest station with e85 is fourty minutes away. I run this in my supra. The V is on 93 octane and methanol. My tuner says E85 is a lot safer than 91 becasue of it higher octane. That's probably not worded correctly, but he says it's definitely safer.
 

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he should have enough fuel pump for his level of mods, injectors likely but he hasnt stated which ones he has
accounting for your colorado air im thinking a good 50-70hp. for the cost of injectors and a flex fuel sensor its a good bang for your buck
 

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I say slap some ID1300 injectors and call it a day. They will support your current setup and leave you with room for growth. I've been running them on my car since it was fairly stock up until now with more mods and haven't had a single problem. I gained 60 rwhp just by switching to E85 on a conservative tune, now granted I'm sitting at sea level here in Houston, TX.

Installing injectors is a fairly simply process however the car will either not run or not run right until it's tuned for the larger injectors so keep that in mind. My tuner at the time sent me a remote tune to get the car running well enough to get to his shop to dyno tune it. Just FYI.
 

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I think we all assume this.

 

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I think we all assume this.

i assumed that too, he threw "flex" in there which had me wondering
 

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Discussion Starter · #11 ·
Thanks for the reply’s guys! Much appreciated! For clarification the DSX auxiliary flex fuel kit is just the sensor. When talking with my tuner he said the car was good for e85 but couldn’t tell me which type of injectors i had in it
 

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I don’t know if you will have enough fuel pump , especially if you come down from the mountains
your tuner should know this, what does he think ?
 

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If you aren't going to run E85 all the time and don't have huge power goals Id do 1050s. The 1300s w pump gas are going to have poor low fuel demand performance when driving normally at low rpm as you will hit non linear short pulse ranges. ID1050 is actually flowing at 1200+ at our fuel pressures (the rating is at 42 psi and our cars are 60-70 psi under high mode)
 
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If you aren't going to run E85 all the time and don't have huge power goals Id do 1050s. The 1300s w pump gas are going to have poor low fuel demand performance when driving normally at low rpm as you will hit non linear short pulse ranges. ID1050 is actually flowing at 1200+ at our fuel pressures (the rating is at 42 psi and our cars are 60-70 psi under high mode)
ID 1300s are fine at low pulse width on pump gas when tuned properly. I do agree 1050s will cover the needs of most SBE LSA builds though
 

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people been saying that larger injectors wont run well at lower RPM and its rubbish
That's a lazy tuner saying that
There is a limit to what will run on pump gas at idle and light throttle but its beyond 1340cc. Proper data is key as the injectors get bigger though. The 1700s should be on ethanol all the time but pretty much no one is going there with a daily.
 

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I mean I know people say what "shouldnt" be done but they told me the same thing about running 2000's on another vehicle yet I get a rock solid idle and mixture

obviously not a crazy race style injector and I agree there wouldnt be a need to run 1700 or 2000s for his set up , I wish they had the 1300s when I was running E85 it would have been a no brainer for me to run an injector designed from the start for alternative fuels
 
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