Need Rev Limit Help
#1
Rotary Freak
Thread Starter
Need Rev Limit Help
Not getting much assistance over on the race thread so I will try here.
I run a Speed Challenge style 1988 RX-7. I am installing a Megasquirt to take control of the fueling side, but need help on the ignition side. I am assuming that the ignition controls the rev limit and not the fueling side.
I need to increase my soft rev limiter by about 300 rpm (400 would be better). If I can do this I will save the need to shift up and back down 3 times a lap at Mosport or sit on the 7800 rpm rev limiter for 3 times a lap. I have modeled this change and it will save me close to half a second.
I have also tried keeping my rev limit at 7800 but adding 20 hp and I only gain 3/10's. I will be trying to do both to gain more.
Anyone have any idea on a method that I can use to increase my rev limit. It costs a ton to have my ecu reflashed here (Toronto) and I would rather put in a complete programable system than reflash.
Just looking for something quick to try ( I have 8 ECU's so if I screw up one it is no great loss). Thanks in advance.
I run a Speed Challenge style 1988 RX-7. I am installing a Megasquirt to take control of the fueling side, but need help on the ignition side. I am assuming that the ignition controls the rev limit and not the fueling side.
I need to increase my soft rev limiter by about 300 rpm (400 would be better). If I can do this I will save the need to shift up and back down 3 times a lap at Mosport or sit on the 7800 rpm rev limiter for 3 times a lap. I have modeled this change and it will save me close to half a second.
I have also tried keeping my rev limit at 7800 but adding 20 hp and I only gain 3/10's. I will be trying to do both to gain more.
Anyone have any idea on a method that I can use to increase my rev limit. It costs a ton to have my ecu reflashed here (Toronto) and I would rather put in a complete programable system than reflash.
Just looking for something quick to try ( I have 8 ECU's so if I screw up one it is no great loss). Thanks in advance.
#2
Queer
Join Date: Mar 2001
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Not quite sure how you want to "quick try something". You mean some programming change in your current ECU? But you said you didn't want to re-flash it. I guess you could try an EEPROM programmer so you could do it yourself. It should be too hard since it is a simple change. Other than that I guess there might be a way to fool the ECU into thinking it is at a lower RPM. But that would mess with your fuel curves and stuff.
I can't really think of any easy way to raise the rev limiter.
I can't really think of any easy way to raise the rev limiter.
#4
Rotary Freak
Thread Starter
Rev Limiter Help
Thanks for you help and concern. In the series I run in electronics are open, so changes to the ecu are legal. Secondly, in saying that I don't want to reflash the e-prom is really a question of economics. To get the e-prom re-flashed by an outside company will cost well over $350 and give me no flexibility afterwards. I don't have the know how to do this myself.
I am toying with going fully programable, versus just fuel and if no one can help than I just may have to but I hate to spend $$$ that I don't have to. I would rather spend it on tires. Anyways thanks to everyone for trying and if anyone has anything else please let me know. Regards.
I am toying with going fully programable, versus just fuel and if no one can help than I just may have to but I hate to spend $$$ that I don't have to. I would rather spend it on tires. Anyways thanks to everyone for trying and if anyone has anything else please let me know. Regards.
#5
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
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Re: Need Rev Limit Help
Originally posted by 23Racer
Anyone have any idea on a method that I can use to increase my rev limit. It costs a ton to have my ecu reflashed here (Toronto) and I would rather put in a complete programable system than reflash.
Anyone have any idea on a method that I can use to increase my rev limit. It costs a ton to have my ecu reflashed here (Toronto) and I would rather put in a complete programable system than reflash.
http://www.pocketlogger.com/index.php?pid=rtek7feat
Originally posted by 23Racer
I am installing a Megasquirt to take control of the fueling side, but need help on the ignition side.
I am installing a Megasquirt to take control of the fueling side, but need help on the ignition side.
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