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Old 12-16-2002, 10:36 PM   #1
BMW Man in 2.5RS
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Default Gotta win what should i do

Ok here i go i have a huge race as soon as i get home from school with a friend in his 2002 Celica GTS against my 2001 subaru impreza 2.5RS.

Heres the kicker. My best two runs are 14.9@90 and 14.8@87. That was with the back seats and interior stripped and mirrors folded in. His best run is 15.0@93.5 with just and intake.

Heres the thing i want to win really bad but this race is so hard to predict. I can pull consistant 1.93 sixty foots and he usually pulls 2.2's and 2.3's. I have him off the line but i know hes gonna be pullin hard up top. Now i know ill gain some MPH from removing the exhaust because i wont have my penis piping cat in the way and he is only removing from the axle back becuase supposedly the celicas have nice flowing mid pipesw from the factory.

im wondering if it would be to my advantage to remove the rear drive shaft as i will gain mad MPH from it and possibly ppull him up top. I know the shaft will still spin but the stress of the wheels wont be there. But then ill have lost my launch advantge by a lot. I mean i still ave way more torque then him so i know i can pull a decent launch im just wondering if this will be worth it.

My question is how hard is it to remove. or is it even possible without leaking oil. I havent gotten under there and pulled the exhaust to look and see if the u joints are external or not. If i do it i would also like to dyno my car too and a two wheel dyno just to get some sense of how much power im pushing.

Let me know your thoughts on the race and if its worth it to remove the rear drive shaft. Thanks...Joe
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Old 12-16-2002, 10:46 PM   #2
DJ 9iron
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Are you for real?
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Old 12-16-2002, 10:47 PM   #3
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what do you have done to your car that your getting 14.9, and 14.8 1/4 mile times? I ran my freind in his celica GTS a while back before i was racing my car at the track and i blew his doors in. Im only running 15.3 1/4 mile times though. just intake and exhaust. he had injen intake and thats all.

Erik
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Old 12-16-2002, 11:48 PM   #4
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yeah... don't remove your rear drive shaft. That would be bad. And I think if you took it off, the center diff would send most the power to the rear since it's the easiest to spin, and you'd loose most your power. If you wanted a FWD car, why didn't get a civic?

If you feel like removing things, remove rear seats, passanger seat, spare tire, jack, maybe even bumpers.
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Old 12-17-2002, 12:03 AM   #5
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Also...to save extra weight, remove yourself from the car.



Mick
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Old 12-17-2002, 12:16 AM   #6
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Instead of removing the rear drive shaft, just open up your transmission and remove 5th gear and reverse. You won't be using these gears and will save weight and maybe free up HP.


Seriously though, I wouldn't mess with the drivetrain to try to win a drag race. AWD drivetrains eat up power, but there's no way around that. You have the launch advantage, he has the top end advantage - just practice and hope for a great launch.
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Old 12-17-2002, 12:17 AM   #7
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BMW Man in 2.5RS - what mods are you running? The simplest thing to do is just more mods

unless you have an 4EAT, do not even try removing the drive shaft.
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Old 12-17-2002, 12:32 AM   #8
BMW Man in 2.5RS
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ER- i am running injen intake, borla headers, tanabe racing medalion, and lightened pullies. The guy im gonna run runs a 15.0 with just an intake so it will be really close.

Phread-it was just a thought about the rear drive shaft the center diff would put more power to the front though as easier to turn would simulate spining therefore the center diff would put the power to the wheels that are gripping aka harder to turn. I dont think that would be the problem. As for the weight reduction were running with full interiors including spare tires the only thing i can take out is my sub and amp. So i mean i had at least 50-100lbs less when i ran my 14's so thats what im really worried about. but i am removin the exhuast for the race so thats a little weight off. And for the record i dont want FWD its just somthing i can do to possibly be faster...saying somthing like that is like telling people with aftermarket turbo kits they should have just bought a factory turbo in the first place.

Slack-yea that was funny...

Doink-Ok i dont know if uve ever been under our car but the drive shaft would take all of about an hour to remove people do it all the time to run it on 2wd dynos its not like im taking the tranny apart.

GTB-Mods were in the originla post and above in this post. I dont have the money for anything right now i mean the best i could do is get a chip and thats not even worth it really.

All i did was ask a question im not nieve of my car and asking a dumb question the sarcastic remarks really are not neccessary. i just want some opinions thanks to those who gave them...keep em coming...Thanks...Joe
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Old 12-17-2002, 12:53 AM   #9
Kevin Thomas
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Default Bottom line

I know you aren't doing this on the dragstrip and this thread will probably get closed soon since it's not in Off Topic.....so here it goes.

Bottom line is: If you get a better reaction time, you will win so get the jump out on him as soon as possible without cheating.

If he gets the jump on you by say.... .1-.2 seconds and you are racing a full 1/4 mile, then it'll be a tie or he'll win. If less, you'll win.


So there you have it.

*This is all based on the info you provided* Take care!
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Old 12-17-2002, 01:04 AM   #10
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d00d! u should git sum NAWWZZ!!!
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Old 12-17-2002, 02:43 AM   #11
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Quote:
Originally posted by BMW Man in 2.5RS
Phread-it was just a thought about the rear drive shaft the center diff would put more power to the front though as easier to turn would simulate spining therefore the center diff would put the power to the wheels that are gripping aka harder to turn. I dont think that would be the problem.
I'm no expert on Subaru's AWD, but how I understand it, they use viscous coupling center differentials. Basicly just a limited slip. If the front or back starts to slip, it heats up the fluid in the center diff, which becomes thicker and makes it harder for the front to spin faster than the back, or vise versa. The tires with the least amount of traction will still get most of the power (will spin the fastest) but it won't be as bad as if it were an open diff. now when you pull the rear driveline, your now asking that fluid to heat up enough and get thick enough to pull all 160hp to the front wheels, with 0 resistance on the back. That center diff is going to slip like crazy. It's going to feel like your clutch is slipping.

Maybe someone who knows more about subaru's center diffs can write a better explaination and prove me wrong.
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Old 12-17-2002, 04:08 AM   #12
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Long Story Short - you'll break your car. At least damage, if not destroy the center diff. Too much to lose (spend) to beat somebody who drives a Transformer. Lighten your car up,(Seats, spare, mats, drain the washer fluid, etc) put new spark plugs in, even cheapos, and run a light fuel load,ie, the "gas, stupid!" light should be on.
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Old 12-17-2002, 07:51 AM   #13
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50 shot of nitrous and you'll win easy.
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Old 12-17-2002, 09:26 AM   #14
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BMW Man in 2.5RS: Nice times man. Like Kevin Thomas said the race is most likely going to be decided at the start. Good Reaction and you'll take em. Let us know how it goes.
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Old 12-17-2002, 10:24 AM   #15
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based on your supposed times, you'd have over 150hp to the wheels... I don't think so, with cams or turbo maybe but you're not running 14s with bolt-ons. I say go ahead, remove your rear drive shafts and see what happens.


then maybe you'll go back to your BMW and leave the subarus for the non-idiots.
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Old 12-17-2002, 11:49 AM   #16
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Boy, that was a little harsh, don't you think? BMW Man in 2.5RS was just asking about removing the drive shaft and wanted to know everyone's opinion. It's not like he's throwing attitude.

Anyway, let me tell you, Impreza's attract idiots like every other "moddable" sub-compact out there. As soon as Subaru put the non-functioning hood scoop on the 98 Impreza, it became an idiot magnet.

Just my humble opinion.
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Old 12-17-2002, 11:53 AM   #17
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I take it personally when a street racing thread actually gets non-flaming advice. I just prey that you guys don't hurt anyone else.
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Old 12-17-2002, 12:14 PM   #18
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I got the impression he was racing at a TRACK, not on the street. A track is where you are supposed to race. Why else have quarter mile times posted?

If BMW Man wants to race at a track, then more power to him. I say he should go for it.

You don't "remove your rear drive shaft" and exhaust for a street race, but you do for a track race.
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Old 12-17-2002, 12:21 PM   #19
BOY
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Default Re: Bottom line

Quote:
Originally posted by Kevin Thomas
I know you aren't doing this on the dragstrip and this thread will probably get closed soon since it's not in Off Topic.....so here it goes.
I'm not the only one who thinks this is a BS street racing thread. Sounds like the old "meet me at the flag pole after school..." crap.

Quote:
Originally posted by BMW Man in 2.5RS
Ok here i go i have a huge race as soon as i get home from school with a friend
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Old 12-17-2002, 12:25 PM   #20
Eric SS
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You cannot just remove the driveshaft on a subaru like you can on a Porsche. Do not do this.

Eric
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Old 12-17-2002, 01:50 PM   #21
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If any of you have a non VTD 4EAT try driving around with the FWD fuse in. You will not be happy with the results, except for the fact that its EASY to spin the tires on even an unmodified 2.2 with 205 based tires.

I think your best advantage is practice your launch and run with an empty tank of fuel.
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Old 12-17-2002, 06:18 PM   #22
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How are you gonna get 60' times and ET's from a street race? C'mon...a little credit to the post for christsakes!

Don't remove the driveshaft unless you take measures to lock the center diff. Probably more work than it's worth for what you want.

If you're much faster than him in the 60', then I would find some taller tires to help you out on the big end. You won't be banging the limiter as soon. **OR** go the other way and get some of the shortest wheel/tire combos you can and slaughter the Celica outta the hole and take 4th higher into the powerband through the lights.....yeah....I like that better!

Also, look at the location guys...MD= low altitude and low ET's. It's fairly common to see those numbers.

Practice your launches and reaction times and shifts....it's gonna be close no matter what. Just don't do it on the street and make a dunce outta those of us who are supporting this.

Jay Storm
www.sourcemotorsports.com
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Old 12-17-2002, 06:27 PM   #23
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Yeah, you know how you're not supposed to tow your car w/ 2 wheels down and 2 wheels up? Same thing here... by taking off your rear driveshafts, your rear wheels will be off the ground and your fronts will be on(altho, it will actually act the other way around, but don't worry about that). Not only will it cause damage, you will now definitely lose the race.
Besides, IF you could do this, it would be better off to pull the front shafts off because the wheel hop you'll get drag racing a FWD will kill your ET's...
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Old 12-17-2002, 07:22 PM   #24
DoinkMobb
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Quote:
Originally posted by cvalle-sd
Too much to lose (spend) to beat somebody who drives a Transformer.
Transformer?!?! Hahaahahahahahahaa...that's hilarious.

Ya know, they do kinda look like Transformers.
"Celicaaaas, for chicks not for guys" (sung to the tune of "robots in disguise")
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Old 12-17-2002, 09:07 PM   #25
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i am watching
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