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Old 01-29-2009, 01:29 PM   #1
Walker Lam
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Default Close loop to Open loop and vice versa

in my rom, there are several items in the CL/OL transition.
Would someone explain the following to me? Thank you very much.
1. CL to OL delay: what is delay group value?
2. what is CL to OL transition with delay throttle hysteresis?
3. when the car running at 200km/h for example, i keep stable throttle and rpm and speed. will the car run in Close Loop map?
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Old 01-29-2009, 02:08 PM   #2
Tea cups
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read the help text for the tables (view -> table properties in RomRaider) and read this:
http://www.romraider.com/forum/topic1603.html
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Old 01-29-2009, 10:05 PM   #3
Walker Lam
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i've read them but don't get the meaning well. please help (especially when the car running at 200km/h for example, i keep stable throttle and rpm and speed. will the car run in Close Loop map?)
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Old 01-29-2009, 10:21 PM   #4
Tea cups
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If your "CL to OL delay" are 0, either because the table is 0 or because of exceeding the thresholds of one of the "CL Delay Maximum..." tables (at 200 kmh it will be -> "CL Delay Maximum Vehicle Speed" threshold for sure), then the CL to OL transition will be determined by the "Primary Open Loop Fueling" table. If the fuel map (post primary compensations) calls for more enrichment (i.e. richer AFR) than the "Minimum Active Primary Open Loop Enrichment" threshold then you'll be in open loop, less enrichment than the threshold (i.e. leaner) and you'll be in closed loop in normal operation.
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Old 01-29-2009, 11:07 PM   #5
Walker Lam
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Quote:
Originally Posted by Tea cups View Post
If your "CL to OL delay" are 0, either because the table is 0 or because of exceeding the thresholds of one of the "CL Delay Maximum..." tables (at 200 kmh it will be -> "CL Delay Maximum Vehicle Speed" threshold for sure), then the CL to OL transition will be determined by the "Primary Open Loop Fueling" table. If the fuel map (post primary compensations) calls for more enrichment (i.e. richer AFR) than the "Minimum Active Primary Open Loop Enrichment" threshold then you'll be in open loop, less enrichment than the threshold (i.e. leaner) and you'll be in closed loop in normal operation.
thank you very much
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Old 01-29-2009, 11:13 PM   #6
Walker Lam
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i used a device, ultra II turbo timer, to disable the 180km/h fuel cut (JDM car).
do you think the AFR, timing etc is abnormal when running higher than 180km/h?
last night i have tested, use the device. romraider logger showed AFR around 12 and the speed is just 172km/h (224km/h in real).
then i disable the device and write the ecu speed limit to 255km/h and tested. logged data showed AFR at 11.25 (because it can't show richer number) and speed is higher than 200km/h.
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Old 01-30-2009, 08:25 AM   #7
Tea cups
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You need a wideband o2 - the front o2 is basically useless outside of closed loop. The faster you go, the more throttle you need to overcome air resistance (higher load) and obviously the higher the engine speed, therefore you'll be hitting the richer areas of your fuel map.

I wouldn't use the turbo timer to overcome the fuel cut. You can change the speed limiters in RomRaider. You can even disable it completely for the 16-bit ECU (if you need to go faster than 255 kmh which is the max value for the speed limiter).
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Old 01-30-2009, 09:49 AM   #8
Walker Lam
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what is your opinion if someone use device to cut speed limit instead of changing it in the ecu?
are eur, usd and aus versions' speed limit 255km/h? (so you no need to consider about it)
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Old 01-30-2009, 10:51 AM   #9
Tea cups
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Quote:
Originally Posted by Walker Lam View Post
what is your opinion if someone use device to cut speed limit instead of changing it in the ecu?
are eur, usd and aus versions' speed limit 255km/h? (so you no need to consider about it)
With the 16-bit ECU, the max speed limiter value is 255 kmh, however there is a speed limiter disable switch in RomRaider so you can turn it off completely. So, you can do either in RomRaider regardless of EDM,ADM,JDM,USDM 16-bit ECU - raise the speed limiter to 255 kmh (from whatever the factory limit is) or disable it completely.

Using an external device to overcome speed limit is pointless - why hack up wires when you could easily eliminate the speed limiter with a reflash?
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