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Old 02-14-2001, 03:20 PM   #1
Mike C
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2000 Impreza 2.5 RS
Blue Ridge Pearl

Have a Nice Day? Forester vs. Impreza acceleration

The other day, I borrowed my mom's 1999 Forester L, (we're one big happy subie family ) and when the light turned green, I floored it just so I could see what mommy's car had to offer However to my surprise, it seemed to jump off the line much faster than my 00RS does.

Both cars are automatics, so that adds consistency to the equation, omiting mis-shifts and what-not.

Is the forester tranny ratio'ed more for acceleration than top speed, or is it just faster??

Another idea I had was that it only "felt quicker" because the higher suspension compresses under acceleration so the tilting back feeling tricks my mind into believing that i was traveling faster than i truly was. Or perhaps I was just too disapointed that my mom's grocery-getter goes faster than mine so I had to make up some excuse......

Anyone care to comment??

-Mike-
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Old 02-14-2001, 03:32 PM   #2
XT6Wagon
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Production variences. I have driven a 99 Forester S with a whole lot more oats than ANY stock Si. I have also driven a 2.5RS that could not get out of its own way. The 01 forester was in the middle.
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Old 02-14-2001, 04:43 PM   #3
Imprezer
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?!?!?!?

No you didn't! We were dead even and Bill in MT 2.5RS was 1/4 car lengh ahead of us.
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Old 02-14-2001, 05:00 PM   #4
01 Black RS
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well I've been at the light next to a Forrester and they kept up pretty good...
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Old 02-14-2001, 09:42 PM   #5
Midwayman
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Forrester isnt *that* much heavier than the RS. Dunno what the gearing is, but certainly can compensate for the extra weight I bet.
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Old 02-14-2001, 10:57 PM   #6
AaronB
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Forester's aren't much slower than a stock RS. I 1/4 mile'd mine one time and got a 17.000 with a passenger. The launch pretty much sucked as well.

It had a whopping 1025 miles on it at the time, so it was broken in, barely

I would guess with more practice it would run mid to low 16's at our local track stock.

I would guess at least the first few gears are the same, I seem to be shifting at the same MPH increments in both (5spd)
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Old 02-15-2001, 04:39 AM   #7
shimstock
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I was talking with a Subaru mechanic yesterday and he had mentioned somthing to me about these cars that could explain some of the variations in accerations and speed that's mentioned above.

The stock ECU learns how you drive on a daily basis and creates a base line for your driving style. So what was explained to me was that anytime your in need of more power that exceeds your base line driving the ECU thinks that it's a mistake and taliors your desired needs to what IT thinks you need.

So when talking to him about my car and telling him how i broke the car in slowly, he suggested I do a ECU reset and then take the car out and beat the snot out of it for 20 minutes to get a new higher base line for my driving style. Which should give me better response from the car if it thinks i want that kinda of power all the time.

Does it work? i don't know yet. Am i gonna try it? sure will, can't hurt. I just wish i had some testing equipment other than a butt dyno to test the theory.
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Old 02-15-2001, 06:11 AM   #8
Ginseng
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I am on board with the learning ECU aspect. I share my '98 Forester S with my wife and there is a definite difference in the shift points depending on who has driven it last and whether highway or city the last 15-30 miles. I'm not really sure at what point the 'new' pattern is imprinted but I know it's not right away and wouldn't make sense if its much more than 20-30 miles.
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Old 02-15-2001, 10:35 AM   #9
gumball
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Exclamation

But wouldn't "mom" be a pretty conservative
driver???
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Old 02-15-2001, 11:51 AM   #10
Reiflex
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Shim, I was told the same thing, and yep, I think they are right on the money.
When I had installed my JC intake and reset the ecu. I didn't tighten down my battery terminal enough and it kept loosing contact to the battery posts ever few days. I just put it back on and drove normally. Afterwards it started feeling real sluggish.

ResentlyI had to put back on my stock air box (had a lease inspection). I reset the ECU, (made sure the battery terminals were tight) I drove it like a bat out of hell for 30 mins Redlining it up steep hills, jackrabbit starts & stops, lots of heel toe shifting,....

Now it and it "feels" faster and pulls harder that when JC intake was in. This is because after I put the intake on, the ECU kept inadvertently getting reset whenever the terminal came loose and was re-mapped conservatively by conservative highway driving.
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Old 02-16-2001, 12:36 AM   #11
Reiflex
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Lightbulb


BTW: For anyone reading this thread that is wonder...OK, so how do I rest the ECU?

1) Disconnect the positive (+) battery terminal

2) Leave the battery disconnected for 15 mins. or until the engine has cooled down to matches the outside ambient temperature.

3) Connect the positive battery terminal (tightly )

4) Start the car. DO NOT TOUCH the gas pedal or have anything turned on like A/C, radio,ect.

5) Let the car idle on its own to normal operating temperature (don't touch that pedal)

6) Turn off engine, remove key and let it sit for ~10mins.

7) Map the ECU. Drive it around for 15~30 mins. How aggressive or conservative the ECU maps itself depends on how you drive it during this time.
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Old 02-16-2001, 06:17 AM   #12
lark6
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Thumbs up

Well why do you think we Forester owners come over to the i-club? To learn how to make our little boxes perform better. If we can hang with the best of the Imprezas, imagine what we can do elsewhere! Just think, all of you who embrace the idea of smoking somebody in a wagon (be it WRX, OBS, or modified L): how cool would it be to smoke someone in a Forester?

Okay, daydream over. Back to the salt mine.

Ed
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Old 02-16-2001, 09:00 AM   #13
Foxbat
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No offense but Foresters are for girls At least that's from Subaru's own point of view (all those Forester ads).

Foxbat
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Old 02-16-2001, 09:11 AM   #14
Imprezer
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Post

Foxbat, you are driving a green OBS and you are the one to talk? LOL

Foresters rock!

Bruce, you got it! Me and you! Mano amano! Eye to eye! Next time we go out I will whoop your P1 wheelin' butt.
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Old 02-16-2001, 09:14 AM   #15
blaster88
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bruce,

Do you have some sort of condition that requires you to have an ass filter? And it was dirty?

You should get that looked at.
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Old 02-16-2001, 09:23 AM   #16
crbf1
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Post

Just a hint on disconnecting/reconnecting battery cables: you should always disconnect the negative cable first and hook up the neg last. This will prevent unwanted "arcing" should you contact a ground while removing the positive cable. Arcing has a very nasty habit of frying certain ECUs in cars.
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Old 02-16-2001, 11:07 AM   #17
Retsyn
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My '01 Impreza is much quicker than my wifes 98 Forester S. Of course my '98 Legacy GT was faster than my wifes Forester... The ECU could be the key. My wife is a complete nancy when it comes to driving. She'll drive fast, but takes her time getting there...
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Old 02-17-2001, 12:43 AM   #18
Mike C
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Blue Ridge Pearl

Lightbulb

Hmmmm ECU reset sounds tempting, but as Retsyn just said, my mom also drives very conservativly (she is after all a part-time driving instructor) so why would her forester be quicker.....

Oh well, when the weather gets better i'll reset it and see what happens (unless you all have a better idea)
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Old 02-17-2001, 06:05 AM   #19
lark6
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Wink

Hmm...maybe your mom has to let off a little steam once in a while. Resetting the ECUs on both may be the way to go to get a fair comparison.

Now if you'll excuse me, I'm off to join the girls in the Forester Forum...

Ed
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Old 02-17-2001, 06:16 AM   #20
Adrian128
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This might be a bit off topic..but is there a Forester GT (turbo)sold in the US of A?
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Old 02-17-2001, 07:55 AM   #21
Foxbat
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There is no Turbo Forester sold in US. Impreza WRX will be the first new turbo Subaru here in US.
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