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Old 04-19-2001, 07:53 PM   #1
Skirvdawg
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Question Hit the rev limiter?

I think I may have it the rev limiter today, but I'm not sure. I've never had a car with one before. Here's the deal...I'm pulling away from a light and just mash the go pedal. Next thing you know, I feel this hesitation and thought the car stalled or died or something like that, but then I looked down and saw my tach needle dancing up around 6k, and I remembered that the Subie has a rev limiter.

So...did I hit it or what?
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Old 04-19-2001, 08:02 PM   #2
Blindeye_03
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Yea...oh well (:lol I hit my rev limiter alot getting used to driving a 5speed & I think its alright, cuz thats why it is there.
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Old 04-19-2001, 08:03 PM   #3
IowaRS
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You might want to pay a little more attention to your tachometer in the future.

Regardless, I'm sure you did hit the rev limiter it kicks in at about 6,300 RPM.

NOT A BIG DEAL!!!!

The rev limiter cuts spark or retards timing or restricts fuel. Depending on the vehicle mfg. I don't recal what subaru does I think it cuts fuel.

The rev limiter is there to prevent engine damage from excessive RPM.
There is a fairly large safety factor there.
I'm quite certain that the engine can probably handle 7,000 rpm and still be OK, but they cut it off at 6,300 to be safe.
Just in case there might happen to be a weak component in the lot.

I constantly bounce off of the rev limiter while autocrossing. It takes too much time to upshift to 3rd and then immediately downshift to 2nd again. Might as well just ride the rev limiter for a couple seconds.

BTW, I can't think of a modern car that DOESN'T have some type of rev limiter, and many have speed limiters too.
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Old 04-19-2001, 08:10 PM   #4
ChosenWon
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I also had my first expieriance with the rev limiter last night while getting a late night snack.....my co-workers Ford tortus SE.

It was really weird. I have a whole new respect for my beast now. I bounced the rev limiter on 1st, 2nd and almost on 3rd. (only took it to 60 on a deserted road at 12:30 at night. I thought I was doing something wrong too. I will keep a closer eye on it tonight.....he wants a rematch. Some people are a gluten for punishment....
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Old 04-20-2001, 10:41 AM   #5
nizz
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Exclamation

Don't bounce the rev limited like there's no tomorrow. Firstly, our optimal shift points shouldn't be that close to the redline and secondly, you don't want to run the risk of floating your valves.

nizz
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Old 04-20-2001, 11:12 AM   #6
jlyttle
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Actually, I think that it has been universaly accepted that the fastest way to drive these cars is to hit redline just before selecting the next gear. Shift just an instant before the rev limiter is hit.
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Old 04-20-2001, 01:01 PM   #7
Nat
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I believe that when Trey Cobb was working on his monster N/A car he found out that our engines internally were more than good for the 6300 rev limit, and right around 7000 rpm was when the valves started to float. I'm sure that it can be found somewhere from a search, but I am pretty sure this was the case.
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Old 04-20-2001, 05:20 PM   #8
Midnight Racer
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I built a race truck at one time and it had roller followers with hydraulic lifters. The hydraulic lifters are your real limiter as the hydraulic lifters have a max. return at about 7200 rpm. The design of the lifter will not allow it to compress and return any faster. This is where you may experience valve float as a bad lifter may not be able to close the valve quick enough. Now if you put a set of mechanical lifters in there the rpm is almost infinite.
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Old 04-20-2001, 08:49 PM   #9
Aspen_2.5RS
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It's my understanding that the 2.5 has a soft limiter. Instead of bouncing off "badadadada" like a Honda it sticks.

A former friend had broken his arm and we went out cruising in his 99 Outback 5 speed. He let me drive it (since his arm was broken). And I pulled up beside a GS eclilpse (haha) with exhaust. I punched it in 2nd gear while I was looking over at the eclipse driver. It pulled hard, but when I looked down I saw the needle just stuck at redline.....yikes. It only happened for a split second and I immediately depressed the clutch and changed to 3rd. It's kinda weird, the Subaru pulls so good in the low gears you just feel like it's going to pull forever.
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Old 04-20-2001, 08:58 PM   #10
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Has anybody experienced engine damage or premature failure from excessive hitting of the rev limiter.
What would you consider excessive rev limiting or 6000RPM shift points? (once a week - once a day - twice a day - all day )

Thanks,
Stefan
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Old 04-21-2001, 12:00 AM   #11
IowaRS
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Smile

I've always heard / felt the optimal shift point IS the redline.
You want the engine to stay as high in the power as possible when you take the next gear, and in our case just before the rev limiter kicks in is a pretty good point to shift at.

Floating the valves at 6,300 rpm? I sure hope not. I don't think the valve springs are that weak. It would surely take more than 6.3k rpm to start the valves floating.

Now if you are running high pressure induction that's a different story
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Old 04-21-2001, 12:18 AM   #12
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haha... 'ford tortoise' ...
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Old 04-21-2001, 08:17 AM   #13
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You shouldn't try to hit the rev limiter at all. When you hit the rev limiter, your running your engine lean and that causes high engine temp. It's there for a reason. Just be careful in the future.
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Old 04-22-2001, 07:40 PM   #14
BlackGT00
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Unless you have done mods to your engine its pretty much accepted that the EJ25 falls on its face when nearing 6000 rpm so I see no point in hitting the rev limiter in a drag race. I have heard that in auto-x it is sometimes faster to let it hit the limiter when nearing a corner than to shift up and than down again.
Kevin
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