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Old 09-17-2013, 02:30 AM   #1
diss7
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Ways to 'soften' stock rev limiter?

So I finally took my car to the track today for some drift practise.

One thing I experienced for the first time (as I was a good boy during break in) is how the ecu pulls the throttle right away for a good second or so (that's what I'm assuming its doing?) when you hit rev limit.

Have never experienced it before, and it is bloody awful, especially for drifting.

I ended up just working around it, but would really rather not have the second o death if I can help it.

Wondering if anyone has a fix? (That's not another flash/tune) local tuner doesn't have ecutek capability yet, and I have another track day on Saturday. :/

Have thought about bee-r limiter and setting this to a few hundred rpm before actual rev limit. But have just been advised ecu may detect misfiring and throw Cel.

Help!!
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Old 09-17-2013, 03:08 AM   #2
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Yeah it sucks as most drive by wire cars use a throttle cut to control the hard rev limit. This mostly effects racers when trying to stretch a gear out.

Next to a Hydra EMS I'm not sure what else you can do since drifting tends to result in long periods on the rev limiter.
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Old 09-17-2013, 03:18 AM   #3
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Originally Posted by diss7 View Post
So I finally took my car to the track today for some drift practise.

One thing I experienced for the first time (as I was a good boy during break in) is how the ecu pulls the throttle right away for a good second or so (that's what I'm assuming its doing?) when you hit rev limit.

Have never experienced it before, and it is bloody awful, especially for drifting.

I ended up just working around it, but would really rather not have the second o death if I can help it.

Wondering if anyone has a fix? (That's not another flash/tune) local tuner doesn't have ecutek capability yet, and I have another track day on Saturday. :/

Have thought about bee-r limiter and setting this to a few hundred rpm before actual rev limit. But have just been advised ecu may detect misfiring and throw Cel.

Help!!
The stock ECU tune has a big hysteresis value. Depending on the rev limiter that is active, it's either 200 or 350rpm. Which means that the rev limiter kills the engine at the higher RPM value and then doesn't enable it until it drops to the low rpm value. This causes a rather lazy rev limiter behavior.



To fix it, all you need to do is set the ON and OFF RPM very close to each othern (within 50RPM). Or even set them to the same value. This will make the rev limiter softer and more usable. I suspect the calibration team at Subaru decided to set up the stock rev limiter to be feel violent so that it wouldn't encourage drivers to stay up there

FWIW, in our off-the-shelf Openflash maps we reduce hysteresis to 150RPM. Easy to change if you want something softer.

Last edited by Shiv@Openflash; 09-17-2013 at 03:39 AM.
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Old 09-17-2013, 03:37 AM   #4
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Originally Posted by shiv@vishnu View Post
The stock ECU tune has a big hysteresis value. Depending on the rev limiter that is active, it's either 200 or 350rpm. Which means that the rev limiter kills the engine at the higher RPM value and then doesn't enable it until it drops to the low rpm value. This causes a rather lazy rev limiter behavior.



To fix it, all you need to do is set the ON and OFF RPM very close to each othern (with 50RPM). Or even set them to the same value. This will make the rev limiter softer and more usable. I suspect the calibration team at Subaru decided to set up the stock rev limiter to be feel violent so that it wouldn't encourage drivers to stay up there

FWIW, in our off-the-shelf Openflash maps we reduce hysteresis to 150RPM. Easy to change if you want something softer.
Is there anyway I can change this on my setup, with some downloadable software? I already have a flash and a cable, as I've gone FI recently.

Don't really want to have to go into the dealer to make these adjustments; if that is what you're suggesting; which I'm fairly sure you aren't.
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Old 09-17-2013, 03:40 AM   #5
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Is there anyway I can change this on my setup, with some downloadable software? I already have a flash and a cable, as I've gone FI recently.

Don't really want to have to go into the dealer to make these adjustments; if that is what you're suggesting; which I'm fairly sure you aren't.
What flash and cable do you have?
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Old 09-17-2013, 06:47 AM   #6
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What flash and cable do you have?
Ecutek. And the Australian flash for the Bullet supercharger and intercooler system and 98 RON fuel.

But, I'm fairly sure I'm locked out of making changes..
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Old 09-17-2013, 06:53 AM   #7
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Ecutek. And the Australian flash for the Bullet supercharger and intercooler system and 98 RON fuel.

But, I'm fairly sure I'm locked out of making changes..
Just ask your tuner if he can make the change for you and send you a new file. Or are you just using a base file provided from Bullet? They may be happy to know how you do this and roll it out on all their tunes....
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Old 09-17-2013, 08:05 AM   #8
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Yeah it's just the base tune. And local tuner is not able to talk to ecutek :/
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Old 09-17-2013, 09:05 AM   #9
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Yeah it's just the base tune. And local tuner is not able to talk to ecutek :/
They may also need to change the manifold pressure fuel cut resume value if your boosted.
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Old 09-17-2013, 10:30 AM   #10
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What flash and cable do you have?
We need to talk
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Old 09-17-2013, 01:02 PM   #11
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We need to talk
Ok
So how about that new Miss America?
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Old 09-17-2013, 01:10 PM   #12
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Ok
So how about that new Miss America?
Wouldn't bang. Has pointy elbows.
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Old 09-17-2013, 02:14 PM   #13
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Wouldn't bang. Has pointy elbows.
Fine, I will take her..........
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Old 09-18-2013, 02:39 AM   #14
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Ok
So how about that new Miss America?
Well frankly, happy for her and the cultural melting thing, but having lived in NYC, there are way hotter Indian chics out there, fwiw.

I would have to guess there's something behind the shiv(my dads name incidentally ) and the deity derived company name? Or not?

So you're an ecutek shop?
I've looked at your 335 stuff before I sold that car.
Good to see you here.
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