5th gear high rpm throttle closure
Jun 19, 2011, 02:01 PM
#1
5th gear high rpm throttle closure
Have someone experienced this?
I have seen this on several evo X, all with manual gearbox.
It happens only on 5th gear, at 7125rpm the TPS goes from 87% to 55%, and than slowly return to 87%.
All this evo X have airflow and torque DTC disabled, no boost cut, no knock...
I have seen this on several evo X, all with manual gearbox.
It happens only on 5th gear, at 7125rpm the TPS goes from 87% to 55%, and than slowly return to 87%.
All this evo X have airflow and torque DTC disabled, no boost cut, no knock...
Jun 19, 2011, 07:42 PM
#2
I believe that is the speed limiter. Do you happen to be going approx 190 km/h when it happens? (remember the speedo can be a bit off at that speed, so in the general vicinity)
Is it a Euro ROM or JDM?
Is it a Euro ROM or JDM?
Code:
<table name="Speed Limiter #1" address="53062" category="Limits" type="2D" scaling="VehicleSpeed">
<table name="X" type="Static Y Axis" elements="2">
<data>Limiter ON</data>
<data>Limiter OFF</data>
</table>
</table>
<table name="Speed Limiter #2" address="53fb2" category="Limits" type="2D" scaling="VehicleSpeed">
<table name="X" type="Static Y Axis" elements="2">
<data>Limiter ON</data>
<data>Limiter OFF</data>
</table>
</table>
<table name="Speed Limiter #3" address="533d2" category="Limits" type="2D" scaling="VehicleSpeed">
<table name="X" type="Static Y Axis" elements="2">
<data>Limiter ON</data>
<data>Limiter OFF</data>
</table>
</table>
Last edited by razorlab; Jun 19, 2011 at 08:00 PM.
Jun 19, 2011, 09:51 PM
#3
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I have the 3 speed limiters defined for most of the non-USDM cars on my website.
I didn't bother with the USDM, because they don't really have a limit stock, and most people are interested in limiting their max speed.
I didn't bother with the USDM, because they don't really have a limit stock, and most people are interested in limiting their max speed.
Jun 20, 2011, 05:15 AM
#7
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I've noticed this too when going up to 160 mph I'm my car (before tune "stock" and after tune). There must be some lookup table for speed to cut the throttle, it's probably a speed limiter of some kind.
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Jun 20, 2011, 08:39 AM
#9
Oddly I manually induced this at Daytona this year by reducing the max throttle past 7800 from 100% down to 30% at 8000 to avoid having to baby the car at the edge of the rev limiter.
It's possible that the way it calculates load and RPM's it might throw you more to the left than expected at higher RPM's and forcing it to allow less than 100% TPS maximums. You could try adding 100% entries one or two cells to the left in all the Throttle maps at that RPM range and I bet that would take care of it unless there was some odd speed limiter kicking in from another table.
It's possible that the way it calculates load and RPM's it might throw you more to the left than expected at higher RPM's and forcing it to allow less than 100% TPS maximums. You could try adding 100% entries one or two cells to the left in all the Throttle maps at that RPM range and I bet that would take care of it unless there was some odd speed limiter kicking in from another table.
Jun 20, 2011, 09:57 AM
#10
It's acting just like what the speed limiter does, it reduces throttle to approx 50%. Although I do find it odd that it starts adding it back so quickly.
Have you tried increasing speed limiter #2 just to see if that changes it?
Perhaps you found another limiter of some kind.
Have you tried increasing speed limiter #2 just to see if that changes it?
Perhaps you found another limiter of some kind.
