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Old 12-03-2002, 10:43 AM   #1
RaceCarRiot
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Talking proECM + 100 octane race fuel = wheeeeee!

just thought i'd try this out of curiosity, but i was running on fumes, and stopped at a gas station that sells 100 octane race gas just to see how the car would react to a few gallons.

according to the 'spirited acceleration' runs thereafter, i gained an additional 5-6ps at redline (HP = PS x 0.986, as i recall), consistently pulling 115ps with ease. what was most impressive, is the car seemed to be reaching it's toruqe peak MUCH sooner, peaking and flattening out around 3600rpm, and putting out around 85ps, more than a stock 1.8 wound out to it's 5700rpm peak.

also, even with the mere 3 gallons i put in there, and how hard the car was driven, i managed to go a little over 100 miles without incident before chickening out and filling the tank.

-adam-
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Old 12-03-2002, 11:42 AM   #2
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The lower the octane, the better for a N/A car.... Of course you don't want to go below 87.
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Old 12-03-2002, 12:42 PM   #3
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Why is lower octane gas better for NA?
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Old 12-03-2002, 01:09 PM   #4
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it's not a refined so it has more "power" left in it. It is stable enough to not cause detonation, which is one reason why we don't use anything below 87, because it would literaly blow our motors up. there are plenty of threads about this topic, do a search if you want even more info

~Brian
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Old 12-03-2002, 01:21 PM   #5
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ok, cool..just wanted to know what you meant by "better"
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Old 12-03-2002, 01:31 PM   #6
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Why would the creator of this thread claim gains on 100 octane gas if the best kind of gas for a N/A motor is below 90?
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Old 12-03-2002, 01:48 PM   #7
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Quote:
Originally posted by DrBoy01
Why would the creator of this thread claim gains on 100 octane gas if the best kind of gas for a N/A motor is below 90?
because the chip will advance the timing and tweak the fuel map to take advantage of the higher octane.

on a stock car, you wouldn't see any gain.

did anyone read the title of the thread?

proECM + 100 octane race fuel...
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Old 12-03-2002, 01:49 PM   #8
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Default I like 87

For months I had always used 92 or 93 octane in my 2.5 RS. But one day I decided to throw in some Exxon 87 when I was running really low on gas. I'd say it really likes the 87 much better than the 93. Throttle responce seems better. Just have a Ganzflow CAI and Amsoil air filter.

Just my 2 cents.

Ken
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Old 12-03-2002, 02:00 PM   #9
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Default Re: I like 87

Quote:
Originally posted by reidski
For months I had always used 92 or 93 octane in my 2.5 RS. But one day I decided to throw in some Exxon 87 when I was running really low on gas. I'd say it really likes the 87 much better than the 93. Throttle responce seems better. Just have a Ganzflow CAI and Amsoil air filter.

Just my 2 cents.

Ken
That's probably cuz the stock ecu couldn't take advantage of the 93 octane by advancing the timing more.
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Old 12-03-2002, 03:04 PM   #10
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So would a PROECM and 93 or 87 be better
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Old 12-03-2002, 03:46 PM   #11
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Proecm + 93, otherwise it wont do anything.
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Old 12-03-2002, 04:52 PM   #12
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yeah, you have to run premium all the time, or else the chip won't do a whole heck of a lot. but as long as you can resist keeping your foot out of it ALL the time (heh), your mileage should be improved enough to offset the few additional bucks a tank.

having said that, unless i'm cruising on the highway, i usually run my car pretty hard all the time...all of my driving is spirited. between keeping the engine on the boil (so you'd never know it was a 110hp car, *chuckle*), rev-matching on all my downshifts, constantly downshifting and engine braking, etc. i still manage ~25mpg in town on a tank of 93.
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Old 12-03-2002, 06:21 PM   #13
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I had a proecm, dyno'd... does'nt do crap....
all it does (IIRC) is make the ECU run off the cold coolant map, it has NOTHING to do with octane numbers....
Why would he claim this? its all psycological....

Now, prove me wrong, go get me some dyno figures to prove it.
When I took off my WRC decals my car lost 10hp becuase it felt slower! no I swear, and if you say it did'nt you're wrong


~Brian
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Old 12-03-2002, 07:30 PM   #14
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Quote:
Originally posted by rhdude
I had a proecm, dyno'd... does'nt do crap....
all it does (IIRC) is make the ECU run off the cold coolant map, it has NOTHING to do with octane numbers....
Why would he claim this? its all psycological....

Now, prove me wrong, go get me some dyno figures to prove it.
When I took off my WRC decals my car lost 10hp becuase it felt slower! no I swear, and if you say it did'nt you're wrong


~Brian

were you using 87 octane gas? Since the lower octane is better?
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Old 12-03-2002, 08:18 PM   #15
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no!... 93, cause of the turbo
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Old 12-03-2002, 09:00 PM   #16
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I really don't want to get into this discussion again, because it has been posted to death about in the past. I thought the whole theory was that running off a cold coolant map causes timing advance. That is why higher octane gas would help, because it could deal with advancing the timing a lot. I am not saying that it effectively works, or is worth the money, but I thought that the theory behind it.

-Wes
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Old 12-03-2002, 09:02 PM   #17
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well, w/ the 93 octane and turbo, i don't know what the proecm would do. shouldn't really advance the timing more All i know is that for force induction purposes all it does is it has its own voltage clamp and supposedly lets the ecu learn faster. But once you're on boost, all the stock ecu would see is that you're at maximum MAP and will run off the proper fuel map. d0h But you have a MAF-based car ,so i dunno what the proecm does for your car

just babbling here


-vic
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Old 12-03-2002, 09:30 PM   #18
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I had one a sold it a month later since I didn't see any change and yes i was running 93 but others had good results. But what about the knock sensor since it advances timing is there any conflict?
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Old 12-03-2002, 10:31 PM   #19
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Just because a car is NA doesn't mean you should use the lowest octane gas. A NA engine can produce enough heat to cause detonation problems. Try putting 87 octane in an S2000 and see what happens.

95% of 2.5 RS's in the world should use 87-89 octane gas though.
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Old 12-03-2002, 11:03 PM   #20
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Sure is alot of bad information floating in this thread....
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Old 12-03-2002, 11:23 PM   #21
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sorry, I meant to say for RS's..... becuase all motor drags cars use race gas, but that does'nt mean you should... lol..
And I had the ProECM a few weeks before the turbo...
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Old 12-04-2002, 08:53 AM   #22
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if you're running a turbo, i doubt the chip is going to do much for the car, since you're generally going to need to back the timing off...

i didn't mean to spark another debate as to whether the chip works. i can give you a number of reasons as to why aftermarket intakes don't do anything...but despite the fact that numerous people are using them anyways, i don't make it my life's mission to rain on their parade.

i just thought i'd note that the chip DOES indeed show greater benefits from the highest octane gas you can put in the car. that is all.

all readings were taken from an apex RSM, not the boo-tay dyno™. as accurate as a set of rollers? no, of course not, but more so than a g-tech or anything else similar that normal people have easy access to.
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Old 12-04-2002, 09:21 PM   #23
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Hey Racecar,

I felt the very same way as you do. I pumped 110 octane gas in my XT6 at the dragstrip and was using nitrous (that leaned terribly). The throttle response was awesome and the car felt great. The 110 octane was put on the already high 93 that I normally run and I DID feel a difference and it felt great. The car became quieter and felt smoother BUT........BUT.......BUT *Suspense*


I won't comment. You have to run your car on the strip to see where I'm coming from with the 'but'. I tested on several runs on 3 different track nights. Good luck!
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Old 12-05-2002, 12:36 AM   #24
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Racecar,

Just in case you don't feel like sparking another debate...

can you PM me the reason why aftermarket intakes are worthless?
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Old 12-05-2002, 08:34 AM   #25
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Default Re: Racecar

Quote:
Originally posted by Kevin Thomas
...and I DID feel a difference and it felt great. The car became quieter and felt smoother BUT........BUT.......BUT *Suspense*


I won't comment. You have to run your car on the strip to see where I'm coming from with the 'but'. I tested on several runs on 3 different track nights. Good luck!
suspense???

did your car blow up?

didn't take it to the strip, but yes, in addition to this, the car felt much smoother too...

Last edited by RaceCarRiot; 12-05-2002 at 10:55 AM.
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