MY00 bogs at launch (sorry for the dead horse beating!)

horseflesh · 09-04-2000, 11:35 AM

(Let me preface this by saying it COULD be operator error, I guess -- but it sure FEELS wrong... Also, the car is bone stock, and I run 87 gas.)

Anyway -- my MY00 RS bogs when when I engage 1st gear. For about a second the power will smoothly engage, and then my power and RPMs drop. This happens below about 2000 RPMs. (I have to take precise notes next time I drive.)

I can counter this by revving higher prior to disengaging the clutch, but I shouldn't *have* to start the car at 2500RPMs, right?

If I give it more gas when the power drop starts, I can partially compensate, but I have to put my foot WAY into it. The power and RPMs will then surge after about 1-2 seconds in the low-power zone.

The problem is noticeable, though MUCH diminished in 2nd gear.

I have read about other people with this problem. They have listed these things as helping:

NGK platinums
Bosch platinums
Aftermarket air filter/intake
High-octane gas

Anyone here have any experience with this? I am extremely reluctant to take the car to a dealer until I know more about what is going on... Is this my knock sensor? Or something else? Will resetting the ECU clear this up temporarily?

SkinMask · 09-04-2000, 11:59 AM

yeah, same thing happens to me, but I'm pretty positive it bogs a bit right as the clutch and engine equal out, so I just try to run the clutch a bit more if I am launching fast, or right as you feel is dying, push the clutch in a tad more and it will be fine.

-Jeff (SkinMask)

horseflesh · 09-05-2000, 12:04 AM

Thanks for the data point.

A friend at work has an identical RS, I will have to take it for a spin and see how it feels as well.

chrisww2 · 09-05-2000, 12:19 AM

I have the MY00 and had the same hesitation problems at launch. According to Trey at Cobb tuning the 2000 year models react differently to the type of gasilone you put in the car vs other years. This is really the case with any car. I was running 87 and switched to 93. The hesitation is gone now that I am using a different grade of gas. I have also got the K&N panel filter and the underdrive pulley and the performance exhaust from Subaru on that car as well. the problems are no longer there. Runs like a champ! Hope this helps!

-Chris

horseflesh · 09-05-2000, 12:56 AM

After you switched gas grades, did you reset the ECU?

munkis · 09-04-2000, 01:12 PM

Ummmm, dont think changing your gas grade has anything to do with the bogging, its clearly relevent driver input.

The bogging is from not giving it enough gas as related to you rpms or vice versa, giving it gas but letting the clutch out to fast, youll just half to practice finding the correct amount of gas and how fast to let the clutch out.

The clutch is very sensitive and you have to let it out very slow and smooth.

Slow and smooth is the key with the gas and clutch. Once you master that you should have no problem, then you can move onto qwick and smooth! good luck, I had the same probem when I first got the car.

Practice practice practice

Jay McDade
MY00 BRP RS coupe

chrisww2 · 09-04-2000, 02:18 PM

No, I didn't reset the ECU after changing grades of gas. I think what McDade hit the nail on the head.

8Complex · 09-04-2000, 03:06 PM

I drop the clutch about 4250 rpm's and barely ever get a bog. I do get them if I'm much higher or lower then that though. I think what is it is that is a good RPM to launch, sping the tires a little, and then hook at about the same RPM when you get going.

Sunrise City Rider · 09-04-2000, 09:08 PM

Anything higher than 3 grand and you will not get a clean launch, unless you have power to break the wheels loose. N/A need to let the clutch out fast without dropping it, then power shift 1st to 2nd to 3rd to get a the most out of the engine. You have to know your RS to it right. All wheel drive is completely different than FWD or RWD. But, a turbocharged street RS will most likely cover more ground in a shorter time than a turbocharged GSR, because of less slippage.

09-04-2000, 11:35 AM	#1
horseflesh Scooby Newbie Member#: 690 Join Date: Dec 1999 Chapter/Region: NWIC Location: Kirkland, WA, USA Vehicle: 2000 Impreza RS 4 dr Rallye blue!	MY00 bogs at launch (sorry for the dead horse beating!) (Let me preface this by saying it COULD be operator error, I guess -- but it sure FEELS wrong... Also, the car is bone stock, and I run 87 gas.) Anyway -- my MY00 RS bogs when when I engage 1st gear. For about a second the power will smoothly engage, and then my power and RPMs drop. This happens below about 2000 RPMs. (I have to take precise notes next time I drive.) I can counter this by revving higher prior to disengaging the clutch, but I shouldn't have to start the car at 2500RPMs, right? If I give it more gas when the power drop starts, I can partially compensate, but I have to put my foot WAY into it. The power and RPMs will then surge after about 1-2 seconds in the low-power zone. The problem is noticeable, though MUCH diminished in 2nd gear. I have read about other people with this problem. They have listed these things as helping: NGK platinums Bosch platinums Aftermarket air filter/intake High-octane gas Anyone here have any experience with this? I am extremely reluctant to take the car to a dealer until I know more about what is going on... Is this my knock sensor? Or something else? Will resetting the ECU clear this up temporarily?

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09-04-2000, 11:59 AM	#2
SkinMask Scooby Newbie Member#: 1801 Join Date: Jul 2000 Location: Akron, OH Vehicle: 2000 2.5RS Blue	yeah, same thing happens to me, but I'm pretty positive it bogs a bit right as the clutch and engine equal out, so I just try to run the clutch a bit more if I am launching fast, or right as you feel is dying, push the clutch in a tad more and it will be fine. -Jeff (SkinMask)

09-05-2000, 12:04 AM	#3
horseflesh Scooby Newbie Member#: 690 Join Date: Dec 1999 Chapter/Region: NWIC Location: Kirkland, WA, USA Vehicle: 2000 Impreza RS 4 dr Rallye blue!	Thanks for the data point. A friend at work has an identical RS, I will have to take it for a spin and see how it feels as well.

09-05-2000, 12:19 AM	#4
chrisww2 Scooby Newbie Member#: 2144 Join Date: Aug 2000 Location: Raleigh NC Vehicle: 2006 B9 Tribeca Black	I have the MY00 and had the same hesitation problems at launch. According to Trey at Cobb tuning the 2000 year models react differently to the type of gasilone you put in the car vs other years. This is really the case with any car. I was running 87 and switched to 93. The hesitation is gone now that I am using a different grade of gas. I have also got the K&N panel filter and the underdrive pulley and the performance exhaust from Subaru on that car as well. the problems are no longer there. Runs like a champ! Hope this helps! -Chris

09-05-2000, 12:56 AM	#5
horseflesh Scooby Newbie Member#: 690 Join Date: Dec 1999 Chapter/Region: NWIC Location: Kirkland, WA, USA Vehicle: 2000 Impreza RS 4 dr Rallye blue!	After you switched gas grades, did you reset the ECU?

09-04-2000, 01:12 PM	#6
munkis Scooby Guru Member#: 1847 Join Date: Jul 2000 Chapter/Region: Tri-State Location: brokenmotorsports.com Vehicle: Team Broken: V6 GF rallyarmor.com	Ummmm, dont think changing your gas grade has anything to do with the bogging, its clearly relevent driver input. The bogging is from not giving it enough gas as related to you rpms or vice versa, giving it gas but letting the clutch out to fast, youll just half to practice finding the correct amount of gas and how fast to let the clutch out. The clutch is very sensitive and you have to let it out very slow and smooth. Slow and smooth is the key with the gas and clutch. Once you master that you should have no problem, then you can move onto qwick and smooth! good luck, I had the same probem when I first got the car. Practice practice practice Jay McDade MY00 BRP RS coupe

09-04-2000, 02:18 PM	#7
chrisww2 Scooby Newbie Member#: 2144 Join Date: Aug 2000 Location: Raleigh NC Vehicle: 2006 B9 Tribeca Black	No, I didn't reset the ECU after changing grades of gas. I think what McDade hit the nail on the head.

09-04-2000, 03:06 PM	#8
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	I drop the clutch about 4250 rpm's and barely ever get a bog. I do get them if I'm much higher or lower then that though. I think what is it is that is a good RPM to launch, sping the tires a little, and then hook at about the same RPM when you get going.

09-04-2000, 09:08 PM	#9
Sunrise City Rider Scooby Specialist Member#: 1503 Join Date: May 2000 Chapter/Region: South East Location: Sunrise, FL, USA Vehicle: 2000 Impreza W"RS"X Blue Ridge Pearl	Anything higher than 3 grand and you will not get a clean launch, unless you have power to break the wheels loose. N/A need to let the clutch out fast without dropping it, then power shift 1st to 2nd to 3rd to get a the most out of the engine. You have to know your RS to it right. All wheel drive is completely different than FWD or RWD. But, a turbocharged street RS will most likely cover more ground in a shorter time than a turbocharged GSR, because of less slippage.