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Old 08-11-2007, 09:24 PM   #1
ImprezaRSfan!
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99rs ej207 spec-c
its for sale

Default GT35r ej207 - 450 on pump w/water

Sup guys just posting my dyno result from monday. Got dyno tuned at altered atmosphere in maryland. Car has the following mods

v8 ej207 motor
gt35r .82
UR rotated uppipe
greddy 4-1 header
3" catless turboback
UR 1260cc injectors (they were only at 70% idc)
two walbro 255 fuel pumps
turbosmart FPR
fmic
Hydra
Hydramist water injection

Using standard 93 octane, the car made 390 on pump at 22psi then 449 w/ water injection at 27 psi. Dyno was a dynojet awd roller dyno.



Sorry for the crappy photo and Altered Atmospheres no-ink in there printer lol.
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Old 08-11-2007, 09:35 PM   #2
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Was it just straight water to raise the effective octane rating, or was there alcohol mixed in to raise the literal octane rating?

In either case. Great numbers.
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Old 08-11-2007, 09:45 PM   #3
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that is so awesome for the stock block...if i recall youve had the gt35r on the bone stock longblock for a while...how many miles and hows it holdin up???
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Old 08-11-2007, 09:54 PM   #4
WRXsponge
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August must be the month of the 207s. Nice numbers. In a 99 RS no less. Bad ass.
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Old 08-11-2007, 10:53 PM   #5
WRX 555 STi
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Interesting....What kind of a trans are you using? Got any times yet?

~Anthony.
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Old 08-11-2007, 11:13 PM   #6
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looks good but

time for some cams and an extra 1000rpms on the tach
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Old 08-12-2007, 02:12 AM   #7
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Quote:
Originally Posted by WRX 555 STi View Post
Interesting....What kind of a trans are you using? Got any times yet?

~Anthony.
x2 ... im on the same dilema.
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Old 08-12-2007, 02:51 AM   #8
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running a sti 6speed tranny, so no drivetrain probs at all. Im using windshield washer fluid, $1.05 a gallon. I think its 30% meth, 70% water.
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Old 08-12-2007, 03:30 PM   #9
skiblur
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nice nice!! I love your car so much. How many miles on this setup, and how do you drive it? I'm only asking because I've been dailying the green on a v7 for a year now and am getting itchy to rotate
Hunter
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Old 08-12-2007, 04:56 PM   #10
Matzo Balla
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nice.. i love my 207. ^^^ im also wondering the same thing..
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Old 08-12-2007, 09:26 PM   #11
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i am going with a 3076r 0.82a/r with meth on my 207. i'd rock a 35r but i think its a bit laggy for me. i can always upgrade later tho. ej207 ftw!

congrats on your numbers. thing must pull insane, especially in a gc.
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Old 08-13-2007, 06:54 AM   #12
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Quote:
Originally Posted by SaabTuner View Post
Was it just straight water to raise the effective octane rating, or was there alcohol mixed in to raise the literal octane rating?

In either case. Great numbers.
it doesn't
water works as an intercooler meth works as an octane boost thats why many people run combinations of both.
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Old 08-13-2007, 07:05 AM   #13
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Very nice

def
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Old 08-13-2007, 07:13 AM   #14
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it doesn't
water works as an intercooler meth works as an octane boost thats why many people run combinations of both.
"Effective" was the key word in my statement. It has the same effect as slightly higher octane.

Even in experiments where the air temperature was controlled after the water was injected, so that there was no net cooling effect, there was still an improvement in knock-resistance. NACA did some pretty extensive research on the matter.

Water does more than just cool the air.

-Adrian
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Old 08-13-2007, 12:25 PM   #15
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Nice graph. Spool isn't as bad as i thought it woulda been.
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Old 08-13-2007, 01:48 PM   #16
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Originally Posted by sumfoo1 View Post
it doesn't
water works as an intercooler meth works as an octane boost thats why many people run combinations of both.
and just to let you know as well, meth does more than just act as an octane booster. It carries its own oxygen into the combustion and its latent heat of vaporization is better than that of the water. That makes it a better "intercooler"
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Old 08-13-2007, 02:15 PM   #17
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id get the longest gears possible because that thing has some lag... but nice numbers man! cool setup

What downpipe do you have? custom?
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Old 08-13-2007, 04:25 PM   #18
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nice work!

vids damnit
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Old 08-13-2007, 04:36 PM   #19
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id really like to get a ride in a 35r/Red setup on a ej207..most owners that have posted, claim its not so bad at all on the street and the graphs dont do justice ..of course that is very subjective.
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Old 08-13-2007, 04:55 PM   #20
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Originally Posted by Homemade WRX View Post
...and its latent heat of vaporization is better than that of the water ...
No it isn't. Water has roughly 2.6 times the latent heat per unit volume. (water has one of the highest latent heats of any substance, FYI) Methanol just has a higher vapor pressure (sometimes MUCH higher, since water's is dependent on local humidity), so it evaporates more easily, even though you have to evaporate a much larger quantity to get the same cooling effect. Pre-turbo WI solves that problem to some degree, though creating its own plethora advantages and disadvantages.

"The latent heat values of different liquids are shown here:

Gasoline 350 kJ/kg
Water 2256 kJ/kg
Ethanol 904 kJ/kg
Methanol 1109 kJ/kg"

The density of methanol is around 790 kg per cubic meter, and water is around 1000 kg per cubic meter. (both changing with temperature, slightly) Ergo, even by volume, water absorbs more heat per unit evaporated than methanol.

One cubic meter is one million liters, so ...

Water = 2.256 kJ / liter
Methanol = 0.876 kJ / liter

-Adrian
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Old 08-13-2007, 05:10 PM   #21
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Originally Posted by Homemade WRX View Post
It carries its own oxygen into the combustion ...
This part is a bit pointless. Technically, water "carries more oxygen" into the combustion chamber than methanol, given than, per unit mass (or volume), it HAS more oxygen.

What it does NOT carry is a large number of weakly-bonded hydrogen atoms- that's why it doesn't burn in air: the bonds of the combustion products would be weaker, and thus the process would require energy, instead of releasing energy.

That's what drives combustion, and energy release- the conversion of substances with weak bonds into substances with strong bonds. Water has VERY strong bonds, and so does Carbon Dioxide, but Methanol does not.

Chemistry (and molecular enthalpies) FTW.

-Adrian
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Old 08-13-2007, 05:36 PM   #22
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Quote:
Originally Posted by SaabTuner View Post
No it isn't. Water has roughly 2.6 times the latent heat per unit volume. (water has one of the highest latent heats of any substance, FYI) Methanol just has a higher vapor pressure (sometimes MUCH higher, since water's is dependent on local humidity), so it evaporates more easily, even though you have to evaporate a much larger quantity to get the same cooling effect. Pre-turbo WI solves that problem to some degree, though creating its own plethora advantages and disadvantages.

"The latent heat values of different liquids are shown here:

Gasoline 350 kJ/kg
Water 2256 kJ/kg
Ethanol 904 kJ/kg
Methanol 1109 kJ/kg"

The density of methanol is around 790 kg per cubic meter, and water is around 1000 kg per cubic meter. (both changing with temperature, slightly) Ergo, even by volume, water absorbs more heat per unit evaporated than methanol.

One cubic meter is one million liters, so ...

Water = 2.256 kJ / liter
Methanol = 0.876 kJ / liter

-Adrian
Except for the one cubic meter actually being 1 thousand liters, not 1 million.
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Old 08-14-2007, 12:39 AM   #23
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Quote:
Originally Posted by SaabTuner View Post
That's what drives combustion, and energy release- the conversion of substances with weak bonds into substances with strong bonds. Water has VERY strong bonds, and so does Carbon Dioxide, but Methanol does not.
I stand corrected on the latent heat values...time to brush up on my thermogoddamnits

now for the oxygen, I should have specified that it carries in it own "usable" oxygen as it has a weak bond.
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Old 08-14-2007, 02:36 AM   #24
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...now for the oxygen, I should have specified that it carries in it own "usable" oxygen as it has a weak bond.
Eh. That doesn't really make much difference because it still richens the mixture to add methanol. It carries more reducing elements (carbon + hydrogen) than oxygen. So it doesn't add as much oxygen to the combustion as it adds elements that worsen the already too-rich mixture.

What it does do is replace surplus, lower octane rating, gasoline, as well as do a lot more cooling than gasoline, even if maybe not as much as water, under many conditions.

Still a good thing. Just a 50/50 mixture to avoid keeping a flammable liquid mixture around in the trunk or in a tank under the hood.
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Old 08-14-2007, 02:38 AM   #25
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Except for the one cubic meter actually being 1 thousand liters, not 1 million.
Oop. That happened when I was thinking of representing the volume in milliliters, then ended up using liters and not going back to change that part. Whoops.
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