hey, well ive been talking to a lot of people about my car and im having 1 problem.. I cant seem to launch it without bogging after it chirps and takes off. Nothing serious, i just want a clean launch thats gonna put me not just ahead, but way ahead of those stupid integra gsr's and civic si's . we run so tight and without that bogg id have them by a car length or 2 and its bothering me. I have intake and exhaust on my 2002 impreza 2.5 RS but i just cant seem to find the correct launch. it will be the same launch as the other 2.5s 2001 -->....i just cant get it to just launch and be out.. it always launches and bogs the goes...i mean i try it all the way up at 5500 RPM and i still cant catch it clean..then ive tried it at 2-3000 to see if maybe without the little spin it wont bog but its worse. i dunno...i rev and pan it at about 4500 then put it to 5000 -5500 right be4 i pop the clutch and it feels liek a good launch with the minimal wheel spin the it bogs a bit be4 it really goes..it should be a cleaner launch. I just would be very open to any suggestions becuase this isnt me thats the only one experiencing it... THANX
John

You'd probably need to slip the clutch to keep from bogging.

Yeah, it happens when you release you clutch too quickly. Go through the friction point a little slower. I used to have that happen, but its pretty easy to get the hang of a good launch.
Dan Coty

AllWheelDrift is right. I've noticed this at autocross when launching. Even a redline clutch dump will bog on dry pavement (and this is in the lighter 1st gen RS even). You have to slip the clutch until you the car is moving then release it completely to prevent the bog. (This method obviously isn't the best for clutch life, but it's better for the rest of your drivetrain than a clutch dump and (in my experience) it's a faster launch.)

Shane -- http://www.warpthree.net

ok i gotcha. all you guys are a lot of help cause its pissin me off...as long as i dont smell my clutch off the line nothing can be too bad for it (i hope). i guess ur right just let it out that 2 inches (my 2002 catches pretty early) and wait for a slight catch then pop her and i shoudl get less bog?? sounds good i guess..i just think at 5500rpm lettin the clutch out a lil while its red till its catchin will prob not be too good...i well see..but i see exactly what u mean about DRY pavement becuase when i bust moves on the wet or damp ground im gone no matter what and launch at liok 3500...but when its dry my car bitches out after the initial whiplash...i jsut dont wnt my clutch to fry...ill test it out tho thanx...

Slip your clutch.

This is what I do @ auto-x's and drags. You'll smell your clutch though, but it's a hell of a rush!

Pull your e-brake. Rev till about 4-5000 - no need to go any higher than that. Let your clutch gently out until you can barely feel it catch. When you're ready to go, drop the e-brake, and then release the rest of the clutch and mash the gas at the same time.

Your clutch will stink, but it takes off pretty hard!

LaterZ!
Darren!!

you're gonna smell your clutch burning when you stop beating on it....until then it doesn't hit ya.

jeremy

Clutch drops are BAD!!!

Get an automatic?????;) My bad sorry.We 4eat guys dont have this problem.With the 4eat we call it a brake drop lol.
Rudy:devil:

Does the exhaust and intake help that much? Because I can't imagine my car taking Civic SI or something like that. I know what you mean by the bog, but I can't even get a chirp when I take off. Not even in the rain!

cant even chirp ey?? well that sux..in the rain i can spin it all the way through 1st and chirp into second. without rain tho i bog out of 1st with a clutch drop. whatever...intake and exhaust YES DOES HELP that much. civic si's and integra gsr's have 2 more stock horsepower then 2.5 RS's... with a ****ty launch i take an si and gsr (same engine....rev up to 8000rpm thats their only advantage) up until mid 4th gear and thats on one with a few more mods then me...bone stock i think an si will win but not by much...the stock 1/4 time for them is only a 1/10 of a second fast guys...so keep trying and well all be killing those damn cars...so sick of them EVERYONE HAS THEM. yea but anyways, if i drove an automatic id never win crap. they are slow. not all are. but an automatic of a certain car and a standard is a big difference in power. you can't see it in stats, but u can when u race it and get killed because you aren't stick.. trust me on that one.

The real problem is your AEM intake robbing low-end torque! :lol:

Seriously I have seen similarly designed intakes cause the same problem. You need an intake that helps not hurts low-end torque.

but you see that AEM ISNT the problem. I just got the AEM last week and my launch is better and the torque is far better. I wouldnt hurt my car i thought of tons of intakes and messed around with custom things, and AEM was the best, specifically for my car. Now what im saying is my launch would always bog even before i got the intake. IT doesnt bog any worse, but now after the bog the pick up is way better.

JDSImpreza,
Watch what you say about automatics. I used to think the same way. And yes, most stock autos are slower than the manual version. In fact, when it comes to auto-x, you just can't beat a good manual for being in the right gear at the right time.

However, when it comes to drag racing, the fastest cars on the track are automatics. Why? Because Automatics have two distinct advantages. One, they can multiply torque. Using special methods, you can turn revs of the motor into more torque or harder acceleration. Two, a computer can shift a heck of a lot faster and a lot more accurately than any human. It's also the computers ability to shift accurately that means it doesn't need a flywheel to hold the revs of the motor (hence less weight on the crank and more power to the wheels).

A lot of the lost time for autos is the shifting time. From the factory, trannys are built to shift slower for comfort sake. This can be modified. With a simple shift kit, you can eliminate the time between gears and make the auto RS accelerate a good bit faster than the Manual. I am not sure of the strength of the auto tranny, but that would be something to ask Kevin Thomas. You know, Kevin, the guy who has a 2.2L Impreza Wagon (auto) that does 13s in the 1/4. In fact, I am surprised he hasn't posted to this thread about the misconceptions that people have about autos.

I personally own a manual RS because it's a little better for auto-x. It is also so much fun to row through the gears on backroads. Just don't think that autos are worthless. I know you said "not all" but you make it sound like you have no faith in automatics for racing. Autos are much better for straight-line racing than manuals, when built properly.

no i do have faith in them. my friends volvo c70 ****s on me and his is auto. but the stick version klls him. im just saying that most cars, and in my experience especially 4 cylindars , sticks make them way faster then autos. i get ur drift though

regardless, you need to slip your clutch, not DUMP it. the engine doesn't have enough power to instantly throw your car forward. with Rwd and Fwd the power is lost through the tires. Awd loses it through the clutch(generally speaking). something must slip.

jdsimpreza

Where did you get the AEM intake? It's just a short ram right?

drift freak im not exactly sure what u mean about slip the clutch.. i tihnk u and everyone else means let it out a little slower or something but that doesnt work either im convinced ive tried everything...maybe i just have to live with the bog and just continue dropping the clutch (not extremely hgard tho) and getting a bog. and yes its an AEM short ram air, and it works great, the power enhancement is awesome, feels lke a new car. just call AEM and ask for the 2001 2.5 RS short ram intake. they dont ahve one for the 2002 yet (everyones hung on mods for the WRX, so they forget about us) but its the same thing, same engine, same amount of room and stuff...its all there

the power enhancement is awesome, feels lke a new car

sounds like one, at least. ;)

throw away the aem intake and get a ganzflow or cobb intake. More torque baby! ~ trust me!

-justin

Your launch has nothing to do with your intake, if you're happy with the AEM, great! Let's talk about technique a little bit.

First off, as has been mentioned, "dropping" or "popping" the clutch is pretty bad for our cars. Since we have AWD, our wheels can't just spin away all the extra power. Instead, the transmission takes the shock, and that's not something you want.

The method called "slipping" the clutch means that the extra power is taken out on the clutch, which results in that yummy smell we all love. This is a better technique because, well, clutches are cheaper than transmissions.

I'm going to explain what I have learned through some experience. I'm not a professional or anywhere near it, this is just what I have found to work best. For practice, lift the revs up to about 3500 (you really don't need anything too high to get the hang of it). You don't want to let the revs drop below that, though, which is what happens when you pop the clutch (as you've experienced).

So let the clutch out to the point where it starts to engage. This procedure is much more interactive, so it will take some practice. The main thing you want to concentrate on is keeping the revs at a respectable number, so while you are engaging the clutch, you have to give it more gas. Exactly how much, at which point, and how slowly you let the clutch out can only be determined by playing around, but once I got a slight hang of it, I was able to pull off an awesome 5000 rpm slip that was not all that mean to the car!

I hope some people with more experience will come along and give tips, but this certainly isn't the right forum. This should be moved to motorsports. Yo mods!