driving at 4000 rpm: what is considering driving this car hard?

hedron · 09-09-2024, 02:30 AM

I have Subaru Impreza 2011 2.5l Premium Manual transmission. Third generation. EJ25 engine? Pretty certain that's the one.

So, tradition says to keep it under 3000 rpms. But tradition isn't always correct in all circumstances. Cars have evolved since this rule of thumb was devised. I'm pretty diligent with toping off the oil, as it does burn a quart every 500-1000 miles or so. Which is kind of annoying, but w/e.

1st gear 0-15mph, 2nd gear 15-25/30 mph, 3rd gear 25/30 - 35/40 mph, 4th gear 40 - 45/60 mph, 5th gear 45/60 - 75/95 mph.

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arse_sidewards · 09-09-2024, 06:15 AM

All my EJ22 cars cruise the highway in the 3000-3500 range depending on whether I want to take the 4.10 car or one of the 3.90 cars and whether I wanna go 70 or 90. None of them are under 200k miles so it can't be that bad for anything.

That said, force on the rotating assembly goes up with the square of RPM. There are two ways of looking at this. The first is that 4k is way worse than 3k. The other is that if the engine can rev beyond 6k occasionally then nothing you do under 5k matters.

Householder · 09-11-2024, 10:41 PM

Quote:

Originally Posted by hedron

I have Subaru Impreza 2011 2.5l Premium Manual transmission. Third generation. EJ25 engine? Pretty certain that's the one. tiny fishing
So, tradition says to keep it under 3000 rpms. But tradition isn't always correct in all circumstances. Cars have evolved since this rule of thumb was devised. I'm pretty diligent with toping off the oil, as it does burn a quart every 500-1000 miles or so. Which is kind of annoying, but w/e.

1st gear 0-15mph, 2nd gear 15-25/30 mph, 3rd gear 25/30 - 35/40 mph, 4th gear 40 - 45/60 mph, 5th gear 45/60 - 75/95 mph.

Driving at 4000 rpm by default I find it quite dangerous. So if you can consider it I think you should run 3000 as usual.

sleepyfu · 10-08-2024, 07:27 AM

Never heard of 3000 rpm tradition. Around 4000 rpm is where the torque dip happens, which is probably why it feels natural to shift, and no it's not driving it hard.

Gixhost · 10-08-2024, 06:35 PM

If you are driving and attempting to get the best fuel economy you shift early and attempt to keep RPMs lower. I am not sure if that is what you mean by "tradition says to keep it under 3000 rpms."?

CesaireFaucheux · 10-20-2024, 01:38 PM

Quote:

Originally Posted by hedron

I have Subaru Impreza 2011 2.5l Premium Manual transmission. Third generation. EJ25 engine? Pretty certain that's the one.

So, tradition says to keep it under 3000 rpms. But tradition isn't always correct in all circumstances. Cars have evolved since this rule of thumb was devised. I'm pretty diligent with toping off the oil, as it does burn a quart every 500-1000 miles or so. Which is kind of annoying, but w/e.

1st gear 0-15mph, 2nd gear 15-25/30 mph, 3rd gear 25/30 - 35/40 mph, 4th gear 40 - 45/60 mph, 5th gear 45/60 - 75/95 mph.

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Driving at 4000 rpm by default I find it quite dangerous. So if you can consider it I think you should run 3000 as usual.

hedron · 10-22-2024, 09:01 PM

Quote:

Originally Posted by Gixhost

I am not sure if that is what you mean by "tradition says to keep it under 3000 rpms."?

IDK, I remember people saying they baby their cars by making sure it never revs above 3k.

Kostamojen · 10-22-2024, 10:35 PM

Quote:

Originally Posted by hedron

IDK, I remember people saying they baby their cars by making sure it never revs above 3k.

Those people are morons and should be taken out to the street and shot.

Charlie-III · 10-23-2024, 04:52 AM

Quote:

Originally Posted by hedron

IDK, I remember people saying they baby their cars by making sure it never revs above 3k.

My typical highway cruising speed has it spinning faster than 3000RPM in 5th (5MT).
Would I recommend using 4th for the same cruising speed? Nope, upshift to 5th.

SoCoNoHa · 04-11-2025, 04:00 PM

My Impreza has 4.111 gears and an outback transmission, as well as smaller than stock tires diameter wise. I've had 4 and 6 cylinder engines in that car, sound either at 4k to run 80mph. I've done this for 35-45 min continuously with no apparent issues. I don't think 4k is an issue for a relatively healthy engine.

Popsboxer · 04-15-2025, 05:03 PM

I've actually found winding it a tick more has helped MPG. I'm not saying redline but it's seemed to get better mpg (roughly .4 mpg) going up a tick more RPM.

For the record the 09 pops has is also stick in top running shape, few LBs shaved off, aftermarket clutch fly and just a pulley.

My assumption is as all motors have rules Newton himself set (sorry if that joke goes over too many heads) each engine has it's own happy spot as well.

My theory is a tick more RPM than shifting as soon as you can the motor won't "lug" into the next higher gear but it's probably a touch of struggle to keep into it's torque curve.

Don't go over 3000 revs? I guess you've never had a N/A built honda or motorcycle lol. My own daily civic doesn't even wake up till about 4k.

The car came with shorter gears because it's kinda heavy and gutless, with all due respect. Had no issues with long highway drives including driving at 70+ for at least 2 hours. I really have faith that the engineers were aware people were going to road trip on highways for this car. It doesn't rev a ton, but it needs to. If that makes sense.

longfello · 04-25-2025, 01:02 AM

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09-09-2024, 02:30 AM	#1
hedron Scooby Newbie Member#: 535911 Join Date: Oct 2023 Vehicle: 2011 Impreza 2.5l Pr	driving at 4000 rpm: what is considering driving this car hard? I have Subaru Impreza 2011 2.5l Premium Manual transmission. Third generation. EJ25 engine? Pretty certain that's the one. So, tradition says to keep it under 3000 rpms. But tradition isn't always correct in all circumstances. Cars have evolved since this rule of thumb was devised. I'm pretty diligent with toping off the oil, as it does burn a quart every 500-1000 miles or so. Which is kind of annoying, but w/e. 1st gear 0-15mph, 2nd gear 15-25/30 mph, 3rd gear 25/30 - 35/40 mph, 4th gear 40 - 45/60 mph, 5th gear 45/60 - 75/95 mph. * Registered users of the site do not see these ads.

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09-09-2024, 06:15 AM	#2
arse_sidewards Scooby Newbie Member#: 532328 Join Date: Dec 2022	All my EJ22 cars cruise the highway in the 3000-3500 range depending on whether I want to take the 4.10 car or one of the 3.90 cars and whether I wanna go 70 or 90. None of them are under 200k miles so it can't be that bad for anything. That said, force on the rotating assembly goes up with the square of RPM. There are two ways of looking at this. The first is that 4k is way worse than 3k. The other is that if the engine can rev beyond 6k occasionally then nothing you do under 5k matters.

10-08-2024, 07:27 AM	#4
sleepyfu Scooby Specialist Member#: 124219 Join Date: Aug 2006 Chapter/Region: NWIC Location: Seattle, WA Vehicle: 2017 WRX (P) Lapis blue	Never heard of 3000 rpm tradition. Around 4000 rpm is where the torque dip happens, which is probably why it feels natural to shift, and no it's not driving it hard.

10-08-2024, 06:35 PM	#5
Gixhost NASIOC Supporter Member#: 180111 Join Date: May 2008 Chapter/Region: MAIC Location: Lost in the DMV Vehicle: * 2004.114.3 STi Aspen White	If you are driving and attempting to get the best fuel economy you shift early and attempt to keep RPMs lower. I am not sure if that is what you mean by "tradition says to keep it under 3000 rpms."?

04-11-2025, 04:00 PM	#10
SoCoNoHa Scooby Newbie Member#: 478524 Join Date: Nov 2017 Chapter/Region: NESIC Location: Southern NH Vehicle: All Any Every	My Impreza has 4.111 gears and an outback transmission, as well as smaller than stock tires diameter wise. I've had 4 and 6 cylinder engines in that car, sound either at 4k to run 80mph. I've done this for 35-45 min continuously with no apparent issues. I don't think 4k is an issue for a relatively healthy engine.

04-15-2025, 05:03 PM	#11
Popsboxer Scooby Newbie Member#: 540129 Join Date: Jan 2025 Chapter/Region: MAIC	I've actually found winding it a tick more has helped MPG. I'm not saying redline but it's seemed to get better mpg (roughly .4 mpg) going up a tick more RPM. For the record the 09 pops has is also stick in top running shape, few LBs shaved off, aftermarket clutch fly and just a pulley. My assumption is as all motors have rules Newton himself set (sorry if that joke goes over too many heads) each engine has it's own happy spot as well. My theory is a tick more RPM than shifting as soon as you can the motor won't "lug" into the next higher gear but it's probably a touch of struggle to keep into it's torque curve. Don't go over 3000 revs? I guess you've never had a N/A built honda or motorcycle lol. My own daily civic doesn't even wake up till about 4k. The car came with shorter gears because it's kinda heavy and gutless, with all due respect. Had no issues with long highway drives including driving at 70+ for at least 2 hours. I really have faith that the engineers were aware people were going to road trip on highways for this car. It doesn't rev a ton, but it needs to. If that makes sense.

04-25-2025, 01:02 AM	#12
longfello * Banned * Member#: 406608 Join Date: Nov 2014	Bulk Email Sending Service - Email Sender Tools - Sending Mass Email Software - Spoof Sender Emails Unlimited Inbox Smtp - Send Unlimited Emais Daily & 100% Guaranteed Inbox Bulletproof SMTP Server for Bulk Mailing Japan Kagoya Smtp Server inbox office365 emails Japan Wadax Smtp Server inbox all domain emails Japan XServer Smtp Server inbox all domain emails Zimbra Webmail , Spectrum Webmail, Rackspace Webmail, Biglobe Webmail Sending Inbox Limit 10k Email per days Monthly Bulletproof Link Office 365 Scampage Auto grabber Cookies & Link Redirection Availbale Office365 Invoice Box with Cookies Login Spam Courses 2025 and all Spam Tools you will need Visit Website: http://d4rk.cc/ Channel: whatsapp.com/channel/0029Vb62tcY2v1ItZBCuoY1P Telegram: t.me/D4rkTsn WhatsApp: +16204608397