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Old 04-13-2009, 12:48 AM   #1
BugeyeStyle
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Default Fuel requirements for an Evo3 16g

I am buying an Evo3 16g and want to know what the fuel requirements are. It will be going on an 02 WRX. I was thinking about using blues modded to flow 856cc as they are readily available to me for a good price...and they were used with this turbo. They were however, used to run e85 at times, so I am wondering if they are too high of flow rate for a daily driven 91 pump map. Any insight would be great so I can make an informed decision when it's time to buy.
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Old 04-13-2009, 01:17 AM   #2
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They are a bit large for that turbo and 91 octane for sure, but if you get a tuner that knows his ass from a hole in the ground (locally Mark "Jones" and Clark Turner) they can adjust the latency and make them work fine. They will be perfect for e85 if you choose to go that route later though
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Old 04-13-2009, 01:22 AM   #3
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depends entirely on your tune. 91 would be minimum though. 856 injectors are pretty big, but i don't know much more than that.
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Old 04-13-2009, 02:53 AM   #4
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You can definately use the 850's with 91, but they are pretty big. This would be another good candidate for E85.
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Old 04-13-2009, 03:27 AM   #5
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you should just keep the sti pinks you have for sale dude.
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Old 04-13-2009, 11:36 AM   #6
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I already sold the pinks because of what some other people were telling me. Apparently with my small DB 16g, the pinks would pretty much be maxxed at about 92% for the 280/290 whp area I was expecting to be sitting at. With the 'BIGGEST' 16g, I understood that the pinks would just be too small. Now it seems as though the 856's would be good for e85...but ruin my gas mileage on 91. I am lost...
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Old 04-13-2009, 01:10 PM   #7
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*cough*get a real tuner and your mileage will be fine*cough*
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Old 04-13-2009, 01:21 PM   #8
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If injectors are tuned properly, your mileage will be the same on 850s or 565s.
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Old 04-13-2009, 04:32 PM   #9
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I usually get about 20-21 mpg with my 800's, and I'm also using E85.
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Old 04-13-2009, 04:49 PM   #10
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^and on this guys t00n I am getting 17-22mpg on e85 with 850cc's and seeing WOT regularly

for reference, on a tune that did not adjust latency correctly, or run correct afr's, I was getting 13-17mpg
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Old 04-13-2009, 07:20 PM   #11
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Thanks guys but i am really not sure how often i will see e85 and i want to make sure i will be okay on 91. i need to read more on the e85 deal before i go that route. is it normal to get less mpg on e85...is that why it keeps coming up? i dont like the idea of 13 to 17 mpg (i know...on a bad tune). brock we need to talk again about your setup.
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Old 04-13-2009, 07:32 PM   #12
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You do loose gas mileage with E85. Some people say as much as 30%. I lost 2-3 mpg, which is about 10-12%. Not bad in my opinion, especially for race gas under $2.00/gallon.
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Old 04-13-2009, 07:39 PM   #13
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Okay so what happens when i cant find e85? have a second map setup to change to for running 91?
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Old 04-13-2009, 07:43 PM   #14
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If you get an AP you can run more the one map and flash on the go, or I'm sure a good tuner could tune you for both maps and you could go to him for re-flashing.


P.s. - There's no such thing as not being able to "find" E85. If there's no stations near you then don't go that route. If there is a station near you, then you wouldn't have to find it because you would already know where it was.
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Old 04-13-2009, 08:16 PM   #15
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The only problem with not being close to an E85 station is that if you are tuned for E85 and put 91 in there, your car will run like ****. If you are worried about running out, carry a couple extra 5 gallon tanks with you. E85 is really hard to come by in AZ right now. If more people were to start using it, more people would start carrying it.
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Old 04-13-2009, 08:36 PM   #16
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Also, the point of the e85 mpg thing was to show that even with huge injectors you can still get decent mileage. I would guess on 91 with the injectors I have Mark could easily get me into the 28mpg range.
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Old 04-13-2009, 10:06 PM   #17
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you did just say 28mpg brock...you realize that right? lol, i get like 20ish on my '02 injectors and tdo4. probably smarter to just do the 91 octane just in case lol. i live around 103rd and mcdowell, work at luke (glendale and litchfield) and the only e85 semi close by is 59th and olive... definitely not gonna happen.
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Old 04-13-2009, 10:21 PM   #18
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When my car was stock, I bested 28.9 MPG on the freeway once. I normally got 26-27 freeway and a solid 25 in the city. With stage 2, I get ~24-25 on the freeway and 21-24 in the city.

What Brock is saying is not that out of line.

Last edited by kpluiten; 04-13-2009 at 10:32 PM.
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Old 04-13-2009, 10:28 PM   #19
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Quote:
Originally Posted by What's A GC? View Post
If you get an AP you can run more the one map and flash on the go, or I'm sure a good tuner could tune you for both maps and you could go to him for re-flashing.
... ... $100 to $200 for a tactrix cable and jumpers (depending on version), any somewhat capable laptop, and the free ECU flash software, are all you need for switching maps effortlessly and quickly. All totaled, it will cost about as much as an AP, but the opensource/laptop option will have many more possibilities. Hell, for just flashing maps, a netbook or similar small ultra portable computer would work wonderfully and set you back $200-$300. And those things have 5+ hours of battery life.

However, after a flash, your car will still be learning so it won't be a completely seemless transition, but it won't be bad.

I'm not sure why everyone is so afraid of flashing with a computer. I've never flashed my car, but watching it done, it does not look that difficult. I have flashed other electronic devices including bios chips and cell phones. Same concept.
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Old 04-13-2009, 10:57 PM   #20
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Quote:
Originally Posted by kpluiten View Post
I have flashed other electronic devices including bios chips and cell phones. Same concept.

Pics or it didn't happen.
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Old 04-13-2009, 11:13 PM   #21
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Quote:
Originally Posted by BugeyeStyle View Post
you did just say 28mpg brock...you realize that right? lol, i get like 20ish on my '02 injectors and tdo4. probably smarter to just do the 91 octane just in case lol. i live around 103rd and mcdowell, work at luke (glendale and litchfield) and the only e85 semi close by is 59th and olive... definitely not gonna happen.
I can get 20ish on ethanol fool....

28mpg on the highway is not at all out of line with a good tune
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Old 04-14-2009, 01:06 AM   #22
BugeyeStyle
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wow, i feel like such a newb in the subie world lol. i start to go one way listening to a few people and then read up on what i can find, then something new comes along and i try asking around and its like rewriting history... relearning everything i thought i knew.

SO back to topic, WILL I BE HAPPY WITH THE 856 INJECTORS? Obviously I wont go lean lol, but from what I am reading, WITH THE RIGHT TUNE, I can see BETTER gas mileage than what I am seeing right now with my current setup ON 91 PUMP!!! ?

...and thanks for the input you guys. I really appreciate it! Brock, I wanna take a spin in your car...I am doing EWG as well with the new setup. Reroute though...for teh quietness lol.
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Old 04-14-2009, 01:59 AM   #23
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You'll be fine with the 850's and 91.

My car is faster than Brocks with almost the same setup. I'll give you a ride if you want.
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Old 04-14-2009, 02:01 AM   #24
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^^^ lol
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