Maximas with Apexi RSM w/speed limiter removed?
01-27-2004, 12:32 PM
#1
Maximas with Apexi RSM w/speed limiter removed?
How does it work EXACTLY to override the ECU? Speed sensor? If so, any idea what it's doing?
Can it be changed or just eliminated?
Any different modes of operation?
Can it be changed or just eliminated?
Any different modes of operation?
01-27-2004, 01:56 PM
#3
Senior Member
Join Date: Dec 2002
Posts: 470
Ice-
I dont know exactly how it works, but Im fairly sure it cannot be changed. The limiter is either there or it isnt from what i remember. There are a few different ways you can wire it. One of the ways allows for limiter removal. You tap the speed wire so the signal goes to the RSM, and it somehow tricks the ecu. Are you considering getting an RSM or do you have someting else in mind??
I dont know exactly how it works, but Im fairly sure it cannot be changed. The limiter is either there or it isnt from what i remember. There are a few different ways you can wire it. One of the ways allows for limiter removal. You tap the speed wire so the signal goes to the RSM, and it somehow tricks the ecu. Are you considering getting an RSM or do you have someting else in mind??
01-27-2004, 02:06 PM
#4
I don't have a limiter...well besides not enough HP to overcome wind resistance. LOL!
Anyways, I'd ASSume that it intercepts the speed sensor signal to the ECU and holds a 'value' to keep the ECU from triggering the fuel-cut.
I'm trying to see if there is a way to use the same method to override the fuel-cut at 1800rpm when there is no load and high engine speed, ie for launching off the line.
Anyways, I'd ASSume that it intercepts the speed sensor signal to the ECU and holds a 'value' to keep the ECU from triggering the fuel-cut.
I'm trying to see if there is a way to use the same method to override the fuel-cut at 1800rpm when there is no load and high engine speed, ie for launching off the line.
Originally Posted by 2kGLE
Ice-
I dont know exactly how it works, but Im fairly sure it cannot be changed. The limiter is either there or it isnt from what i remember. There are a few different ways you can wire it. One of the ways allows for limiter removal. You tap the speed wire so the signal goes to the RSM, and it somehow tricks the ecu. Are you considering getting an RSM or do you have someting else in mind??
I dont know exactly how it works, but Im fairly sure it cannot be changed. The limiter is either there or it isnt from what i remember. There are a few different ways you can wire it. One of the ways allows for limiter removal. You tap the speed wire so the signal goes to the RSM, and it somehow tricks the ecu. Are you considering getting an RSM or do you have someting else in mind??
01-27-2004, 02:15 PM
#5
Basically, I'm wondering if I can modify the speed sensor signal in neutral, so the ECU *THINKS* the car is moving, ie has speed or load and the PNP switch is off(open).
Probably end up with just a check engine light, but might work temporarily via a switch kind of like the drop resistor mod.
Probably end up with just a check engine light, but might work temporarily via a switch kind of like the drop resistor mod.
01-27-2004, 04:43 PM
#6
Senior Member
Join Date: Dec 2002
Posts: 470
Originally Posted by IceY2K1
I don't have a limiter...well besides not enough HP to overcome wind resistance. LOL!
Anyways, I'd ASSume that it intercepts the speed sensor signal to the ECU and holds a 'value' to keep the ECU from triggering the fuel-cut.
I'm trying to see if there is a way to use the same method to override the fuel-cut at 1800rpm when there is no load and high engine speed, ie for launching off the line.
Anyways, I'd ASSume that it intercepts the speed sensor signal to the ECU and holds a 'value' to keep the ECU from triggering the fuel-cut.
I'm trying to see if there is a way to use the same method to override the fuel-cut at 1800rpm when there is no load and high engine speed, ie for launching off the line.
01-27-2004, 11:16 PM
#8
I don't know how it does it but the first time I dynoed my 2000 SE auto they said it would pass 135 mph I since gotten the RSM and did a top speed dyno and I got to 144 mph before it went into some kind of fail safe and kicked off the overdrive and started to sputter. It didn't feel like a fuel cut cause a fuel cut just feels like a week decrease.
01-28-2004, 09:51 AM
#9
Yeah, try and *HOLD* anything between 2000-3000rpm and it drops, then hits 1500rpm and bounces back up.
If you're fast you can catch it on the up swing and slip the clutch, but that's beyond my abilities ESPECIALLY at the track with the tree.
I'd like to be able to slowly bring up the RPM to XXXX and slip the clutch without all the monkey business. Sounds like Nissan doesn't want 5spds dumping the clutch above 1800rpm. You can still do it, but you have to be faster then the ECU. If I can't do this, I'll try just keeping the RPM below 1800 and then punch the gas as I slip the clutch. It's not going to be very consistent though.
If you're fast you can catch it on the up swing and slip the clutch, but that's beyond my abilities ESPECIALLY at the track with the tree.
I'd like to be able to slowly bring up the RPM to XXXX and slip the clutch without all the monkey business. Sounds like Nissan doesn't want 5spds dumping the clutch above 1800rpm. You can still do it, but you have to be faster then the ECU. If I can't do this, I'll try just keeping the RPM below 1800 and then punch the gas as I slip the clutch. It's not going to be very consistent though.
Originally Posted by 2kGLE
Im sorry i dont understand. What fuel cut? Ive only had a manual tranny for a while and i havent launched it much. You mean you cant launch from above 1800rpms?
01-28-2004, 09:52 AM
#10
Sorry, nope. Hoping someone here with it can help.
Originally Posted by woosh
Ice,
Do you know which pins it hooks up to on the ECU, or how it is conected? I have a theory how it works but wanna see if it holds water.
Every action has a consequence
SHIFT_woosh
Do you know which pins it hooks up to on the ECU, or how it is conected? I have a theory how it works but wanna see if it holds water.
Every action has a consequence
SHIFT_woosh
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