ok, i know i just asked this question but i realized that i also thread jacked.
if i took e85 which is the equivelant to 110 octane unleaded and put it through a stock compression ratio ln2 with a good tune and proper built bottom end how much boost could i push? anyone have the formula for octane and compression/boost?
uh oh... some one is double posting... thats devil stuff
http://www.j-body.org/forums/read.php?f=40&i=113793&t=113793
|Forged 8.9:1 Wiseco Pistons|Forged Eagle Rods|HPTuners|60trim|Tial Wastegate|
|Precision Intercooler|2.5" Exhaust|2.5" Charge Pipes|630CC Mototron Injectors|
|Stock: Fuel Pump, Transmission, Manifold, TB, Head, Head Gasket, Ignition, Suspension...|
unless you don't like your fuel system, don't use e85
prob about the same as you would on 91 , 10 psi or less
unless you got forged pistons and a fully built motor , and tuned it
i just said built and tuned motor.....i just need to know how high before e85 would detonate. and it will be intercooled
oh and the fuel system will be built for alky
Yeah this ain't happening
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
why is everyone so f***** negative. i did a search and couldn't find any answers so i ask and the only response i get is it won't ever happen. does anyone know where alky detonates? or is everyone just denying my question because they don't know?
We're not answering you for 2 reasons.
1) No one on here knows because it's not a viable thing to do, hence no one has done it
2) GO SEARCH THE DAMN INTERNET
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
alot of the srt4 guys use e85 but they run that mixed with 100 octane for best results
but alot are also running e85 and premium in a 30%e85 70% premium gas
Edited 2 time(s). Last edited Tuesday, September 26, 2006 4:09 PM
does anyone have a formula to convert enable me to add boost into the compression ration to get an actually compression in other words: from ambiant to top of compression stroke compression.
look up the difference between static compression ration and efftective compression ratio.
but your still not going to be able to tell what octane you can use safely, because more than compression ratio determines knock.
things like, combustion chamber design and spark plug heat range are two other things that come to mind.
knowing the compression you can get a rough estimate of what fuel to use, yes i understand that it may not be perfect however it'll be better than trying to hit 20lbs of boost with 9 to 1 comp. on 93 octane (which shouldn't be done)
anywho,
i found a calculator online that took in several factors and i got a rough estimate that with e85, you can use 9.0:1 compression along with 25 pounds of boost.
da fake z24 wrote:knowing the compression you can get a rough estimate of what fuel to use, yes i understand that it may not be perfect however it'll be better than trying to hit 20lbs of boost with 9 to 1 comp. on 93 octane (which shouldn't be done)
anywho,
i found a calculator online that took in several factors and i got a rough estimate that with e85, you can use 9.0:1 compression along with 25 pounds of boost.
why can't it be done? i know of a stealth r/t putting down over 500whp, on pump gas running twin 50 trims around 30 psi, and i know its not running much lower CR...
hell suncavi was hitting what like 17 psi, on 10:1 CR..
there is alot that goes into what octane you can use that i doubt some internet calculator can come up with
i said shouldn't and used it loosely, because it could cause detonation if not properly tuned. not saying it can't be accomplished when motor is built properly with some good tuning. the site didn't take into account for cylinder head design,or tuning (which is a huge part in a turbo application), however it did factor in efficiency. like i said, it was an internet site and cannot confirm the truthfullness of the site, it could have been off
one of the highest HP cars on this forum had it's run on 93 if I remember correctly.. 410 HP on mid 20's psi.
also e85 is not highly acid, nor any close. less so than pepsi I'm sure.. ethanol comes in beer.. vodka and doesnt burn a whole in you nor your very sensitive skin. its more corrosive than gas yes but we run 10% all the time in chicago and most other places. you guys act like its mercury.. just make sure your fuel system is not shabby and dry rotted or cracked and made after 1988 as they are made to endure it.
Sven you totally quarterloafed your computer..
Jrobz23 wrote:one of the highest HP cars on this forum had it's run on 93 if I remember correctly.. 410 HP on mid 20's psi.
If you're referring to Mike K, he was running much lower than stock compression. IIRC 8:1.
fortune cookie say:
better a delay than a disaster.
8 or 8.5 i think it was but yes Mike's car.
now lets say he had a stock cubed motor.. I think it was bored slightly but lets just say for simplicity.
now you can say that the end temp from mikes car is the limit you want to run on 93 then just do the math.
(P1*V1)/T1 = (P1*V2)/T2 ------> standard gas laws
*keep all units the same*
P = pressure (psi)
V = volume (change in v = comp ratio, 2.4L engine, do teh math)
T = temp
1 = pre-comp
2 = post comp
find out his then input yours. not exact by any means but maybe an idea. hope i helped.
Sven you totally quarterloafed your computer..
s eyes.....
