What kinda fuel is best for my setup? - Subaru WRX Forum
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#1 Old 11-28-2011, 08:07 PM
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What kinda fuel is best for my setup?

Details
2011 wrx (3208lbs)
3" invidia catless turboback
Gtspec EL header
750s
dw65 fuel pump
Avo inlet hose
Cobb intake/AP
Kartboy short shift kit
Grimm EBCS
Ngk cold plugs
Aem boost/wideband gauges
ACT HD clutch kit
Racer X FMIC
Enkei Rpf1 rims 17x8 (15.4lbs)
Toyo proxies

Goal 11.6s
116-117mph
1.65 60 ft
800 ft elevation

I was going to run e85 but changed my mind...these are my reasons why

e85 is 15 miles each way in some hick town
e85 kills my gas mileage
e85 isn't good for your car if you run it all the time
e85 can't be mixed with pump gas
e85 makes me wanna run it all year long
e85 might be too much for 750cc inj
e85 is not 112oct, octane cannot be measured


I am trying to decide on race fuels....I know c16, max nos, hcr 114 are great fuels and highest of octane but is that really needed for a vf52 at 22psi? I might run one of those fuels just for security purposes(saving my engine) but I am being told by race fuel experts and some tuners a solid 100-110 oct would be plenty and create plenty of power prob more power then my previous setup of meth injection which was watered down with 93oct. On that note I don't wanna spend 15$ gallon for overkill oct but if its only for track use 2-3 times a year who cares right. I can get these fuels for 8-15$ gallon. This is why people use e85, it makes sick power for under 4$ gallon. I get that and I am not trying to bash e85 but I am not running a drag car, I am running a street car. I am hoping to get some opinions of leaded fuels vs unleaded fuels. People who have ran these fuels with significant results vs pump? Timing and a/f ratios...boost levels?

Vp fuels
Sunoco fuels
rocket fuels
oxygen
leaded
etc

11.82 at 116mph
stock turbo 2011 wrx
337whp 411tq
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#2 Old 11-28-2011, 08:16 PM
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Figure it out for yourself.

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Last edited by psinuse; 11-29-2011 at 05:10 AM. Reason: Should never had posted in here anyway...
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#3 Old 11-28-2011, 08:56 PM
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I will run 93 on street and race gas at track. I don't plan on hitting the track much maybe 3 times a year...5-7 passes each time. I wanna break my old record and set a couple more. I know a guy ran 11.50 and holds fastest sti record but his car is gutted and hes isn't running stock motor so I am shooting for 11.6's. I could have hit 11.8s with previous setup with just a better 60ft time. Mine were junk 1.75, 1.80s. This car is lighter, rims are alot lighter, fmic vs tmic and better rubber, and most importantly better fuel/tune. vf39 and vf48 are great turbos, I would gladly go bigger but I don't wanna build my trans or motor yet. I will wait for them to break that will give me an excuse

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#4 Old 11-29-2011, 06:00 AM
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If you're using the AP, just do a racegas map for the times you need it.

BTW... you can in fact mix e85 and regular 93.

Paul
2007 XT
2007 MS3
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#5 Old 11-29-2011, 10:08 PM
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hmm never heard of anyone mixing em but from I have read e85 is 85% ethanol and 15% gas so that would mean its already mixed but they must add something to it

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#6 Old 11-29-2011, 11:04 PM
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The more gas you add, the lower the E it becomes.... Uncles buddy had an sti a long time ago and he mixed E85 and 93 pretty much the whole time he had it.

-Chris
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#7 Old 11-30-2011, 05:25 PM
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Just power your car with jet fuel. It might take a jet engine to make it happen...but you'll beat the 11 second mark in no time.

Kirt
378awhp/373wtq Custom Dom 3 & CBRD tuned 2006 STI.
"When in doubt...flat out" - Colin McRae
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#8 Old 11-30-2011, 06:17 PM
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My tuner talked me into e85, he says I should sell my 750s and get 1000s that way I have head room in the future. I am going to have two maps one for 93 and one for e85. I am going to buy an e85 tester to make sure the fuel is where its supposed to be. I figure if I only run it on occasion it can't be that bad, the fuel pump/1000s I bought are built to handle e85 so I am good to go...Turmic I was 2/100ths of a sec away from 11s on meth injection with heavier car, heavier rims, cheap tires and tmic.... Im pretty sure I can stomp that time by 4/10ths easy
e85 is jet fuel from what I am reading...its the oxygen that the turbo loves

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#9 Old 11-30-2011, 06:40 PM
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Quote:
Originally Posted by turmic View Post
Just power your car with jet fuel. It might take a jet engine to make it happen...but you'll beat the 11 second mark in no time.
*snicker*

Resident Grumpy Old Man(Keith)
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08' LGT Gears...
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#10 Old 11-30-2011, 06:47 PM
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I'm glad you see the humor in my statement. It was sarcasam at its finest. I don't doubt it that with E85 that you'll break that record.

Kirt
378awhp/373wtq Custom Dom 3 & CBRD tuned 2006 STI.
"When in doubt...flat out" - Colin McRae
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#11 Old 11-30-2011, 07:59 PM
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Quote:
Originally Posted by djc1827 View Post
My tuner talked me into e85, he says I should sell my 750s and get 1000s that way I have head room in the future. I am going to have two maps one for 93 and one for e85. I am going to buy an e85 tester to make sure the fuel is where its supposed to be. I figure if I only run it on occasion it can't be that bad, the fuel pump/1000s I bought are built to handle e85 so I am good to go...Turmic I was 2/100ths of a sec away from 11s on meth injection with heavier car, heavier rims, cheap tires and tmic.... Im pretty sure I can stomp that time by 4/10ths easy
e85 is jet fuel from what I am reading...its the oxygen that the turbo loves
If you haven't considered them look at Five-O injectors... I have their 1200cc's and they're awesome... Same exact injector injector dynamics sells (bosch ev14 - idle better than denso's), and I got them for 360 or so shipped.

Also, with my 1200's my IDC's are at 61% at 21psi, just as a reference. If you never plan on upgrading the turbo, you'll be just fine wtih 1000's. If you do upgrade, you'll run out of headroom fast.

-Chris
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#12 Old 12-01-2011, 06:37 AM
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Hey Chris, did your tuner/you decide that 61% IDC's is ok?

I have always read/been told that IDC's should be in the neighborhood or 80-85% Maybe even 90%

Just curious

Paul
2007 XT
2007 MS3
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#13 Old 12-01-2011, 06:59 AM
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Quote:
Originally Posted by pzr2874 View Post
Hey Chris, did your tuner/you decide that 61% IDC's is ok?

I have always read/been told that IDC's should be in the neighborhood or 80-85% Maybe even 90%

Just curious
Paul, I have heard the exact opposite almost from my tuners and such. They said you shouldnt exceed or go past 90% pretty much. Now Im confused and wondering.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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#14 Old 12-01-2011, 09:04 AM
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Hmm, this is puzzling as I can't see why it would make a difference. My premium tune is near 65% and my E85 tune is about 78% on 22lbs at 4700 feet on a Blouch Dominator. If I was a betting man I would guess they should be near their limit for best performance 80%ish, as that is what they are designed to run at.
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#15 Old 12-01-2011, 10:10 AM
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CamTuning and COBB were explaining it all to me to maximize the tune that 90% should be max and 80'ish would be "ideal" for IDC's... maybe I misunderstood.

Then again, I'm almost at 500 feet here. Cam was irritated (LOL) at the power he was able to get out of the cars compared to his elevation.

Paul
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