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Old 11-01-2017, 11:22 AM   #9
AaronGTR
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AKA: Aaron
Join Date: Aug 2002
Location: Detroit area, MI
Age: 39
Posts: 12,203
Vehicle: 2000 Grand Am GT1 2dr
AaronGTR has made plenty of valid pointsAaronGTR has made plenty of valid points
Well, most people's first instinct is just to go to way bigger injectors than they need to have plenty of room available, but that can cause tuning and idle issues. The stock injectors actually have a decent amount of capacity in them over stock power levels.

If you are going to run E85, well yeah... then you are going to need more injector. You'll also need a bunch of other mods though too. The stock fuel system isn't designed to accommodate that much alcohol. Plus there is the fact that in northern states, E85 isn't actually 85% alcohol year round. Alcohol is difficult to get to burn in cold temps, so in winter they switch to something closer to E65, and in summer it's E85. That means if you have a static tune, your fueling will be off when it switches. If you tune for E85, you'll be running rich in winter.

Factory vehicles use a fuel sensor to detect the alcohol content (about $400 from GM for the sensor). I read a good article a while back in a magazine where the converted an R33 Skyline in Las Vages to run E85 so they could up the boost and increase timing. They had to upgrade the fuel pump and replace most of the fuel lines and fittings to handle the extra flow and resist the alcohol, get special injectors, the GM fuel sensor, and a standalone engine management system that was capable of adjusting the fuel and timing mapping based on the fuel content (like the factory ECU on a flex fuel car). Not cheap or easy. You can do it without some of that stuff... but it won't be as safe or last as long. Not worth it for 4-6 HP in my opinion.
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