Why Go E85?
First of all, why is e85 so damn popular?
The short answer is 3 simple things
- Detonation resistance/Power
- Can be used with stock components
Although there are many other reasons that e85 is becoming the go to race fuel we will focus on these main topics.
In the beginning there was corn (Lol)
Ethanol hasnt always been popular, it was looked at, as this corrosive, and unpredictable fuel by skeptics. Shops seemed to keep e85 at a distance. Partially because of the little knowledge they had about the fuel and partially because everyone assumed that you needed full braided steel lines and many other expensive supporting mods to even run the fuel. The few that were giving e85 a shot were in some ways shunned for it, which put a massive damper on experimentation with this somewhat new fuel. Fast forward to today we now know that ethanol isnt coherently "corrosive" unless it has been accumulating water/moisture. Once e85 has accumulated moisture it can develop a slight corrosive nature which can be easily identified by a milky look to the fuel and a white powder on the inside of the fuel tank. You have to realize though that this does not happen over night, it takes time. If the fuel however is being stored inside of a pressurized fuel tank such as the 300zx fuel tank, the process of moisture accumulation takes even longer. Furthermore if you are driving your car on a regular basis with ethanol, it is quite hard for the fuel to accumulate moisture at all.
Price of e85:
The average price of e85 is fairly cheap for the benefits it supplies. The cost is very comparable to regular 93 octane, and when you start looking at ethanol based fuels, and other race fuels such as c16 the price margin becomes very apparent. In the United States e85 can range between $1.80 and $3.00 depending on your state, compare that to c16 which is on average in the $16 range per gallon and i can bet most of you would choose e85 for your builds.
Detonation Resistance & Power:
The beautiful thing about e85 is its detonation resistance. E85 burns much cooler then most other fuels. This cooler burn promotes a more efficient or "full" burn and decreases the cylinder temps inside of the engine. So it not only works to cool the engine but it allows for a much better condition for the combustion of fuel in order to support power. Here is an example. In the z32 Na-t group its well known that we are limited to low 400whp with na (10:5:1) compression on 93 octane because of the risk of detonation. But if you add e85 to the mix you can find guys in the 500+ range with na (10:5:1) compression without pre-detonation, e85 is in fact so good at cooling that it can even support a non intercooled setup on the 10:5:1 na compression motor up to around the 500hp range with stock twins. Even in Na applications e85 can allow for advanced timing, and a much more aggressive tune that otherwise would not be capable with pump gas.
E85 can be used with stock 300zx components:
Ethanol and the 300zx fuel system mix very well. Stock lines, stock fuel regulator, stock twin turbo fuel pump, stock fuel tank, stock fuel filter ect will take e85 without complaints. now not everything on the 300zx will support e85 in stock form. For instance stock z32 injectors are not big enough to support e85. However 740cc injectors will, and can support enough fuel flow for around 600whp on e85. If you have an NA z32 and you plan to go na-t your stock na fuel pump will not support enough flow for even low hp on ethanol, We at Nickel Performance suggest atleast a walbro 255 fuel pump, however aem's 320lph, or walbro 450/485 fuel pumps will support much higher hp around the 600 range on ethanol, one thing to consider if you use the 450 pump is that the stock z32 fuel control module does not like the larger pump, and therefore will need to be bypassed. Another option for a high hp ethanol setup is duel pump systems, with either two walbro 255's, two aem 320's or a stagered setup with a walbro 255 for regular driving and a secondary larger walbro 450/485 pump for WOT(wide open throttle) pulls.
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