Rev. Limiter
#3
Forgot to say I had apex seals and a crazy street port. So I (along with a friend's 11k autometer guage) say 8k isn't even touching the "real" redline. Just wonderin though there are times when you're foot gets heavy and desperate times call for desperate measures.
#4
Kickin' a little asphalt
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It's not the engine you have to worry about... Its the accessories attached to it. Stuff like the water pump, P/S pump (if you have one), etc will be the first things to go blamo.
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#8
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my 4a corolla did the same thing.. the problem is that the engine still makes power to accelerate past redline, but redline is a value scientifically determined by teams of japanese engineers. This value is the maximum rotational speed the engine should be spun at to avoid rapid degeneration of it or its perhipherals.
later, my corolla engine started clacking.. everywhere... then i drowned it.. the saddest day of my life. may hatchi rest in peace, amen.
edit: relevant information
would it be acecptible to limit the leading ignition only? the trailing system is so weak anyways it may not make power beyond leading limit, or would be so incredibly weak the operator would be more inclined to shift..
i personally agree with the brain+right foot method, though misfire systems make for great cigarette lighters.
later, my corolla engine started clacking.. everywhere... then i drowned it.. the saddest day of my life. may hatchi rest in peace, amen.
edit: relevant information
would it be acecptible to limit the leading ignition only? the trailing system is so weak anyways it may not make power beyond leading limit, or would be so incredibly weak the operator would be more inclined to shift..
i personally agree with the brain+right foot method, though misfire systems make for great cigarette lighters.
Last edited by SparkienSuggah; 11-08-05 at 01:22 AM.
#9
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rev limiters make little sense when you arent making much power. but on turbo cars of higher power cars of any kind, damn yes! my supra i'd blow the engine in no time, if i punch it off the line i cant just watch rev's, they go too damn quickly if the wheels spin i'll be hitting the redline at the top of first, and it just makes more sense to be watching the road than the tach.
id still will never install one of those monster tachs in any car i ever own. atleast in the RX the tach is highly visible and you can feel when the car stops drops out of its powerband. start getting into aftermarket turbos, fuel, etc things get messy....
id still will never install one of those monster tachs in any car i ever own. atleast in the RX the tach is highly visible and you can feel when the car stops drops out of its powerband. start getting into aftermarket turbos, fuel, etc things get messy....
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Originally Posted by ~Nector_Rivera~
Forgot to say I had apex seals and a crazy street port. So I (along with a friend's 11k autometer guage) say 8k isn't even touching the "real" redline. Just wonderin though there are times when you're foot gets heavy and desperate times call for desperate measures.
edit: I could really only see it coming in use if you are pushing 300+ RWHP and have an ultralight flywheel so it revs in about 1/2 a second to redline.
#12
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Originally Posted by nothingbutrotor
We have apex seals too, I dont think different apex seals make a difference in where you will redline, just how long your car can handle being redlined. Same with a streetport. Sure, The egine can handle 11k rpm, but for how long? How well can everything attached to the engine hold up when its all spinning 2000rpm faster than what it is rated for. But if you feel it is neccisary, go for it.
edit: I could really only see it coming in use if you are pushing 300+ RWHP and have an ultralight flywheel so it revs in about 1/2 a second to redline.
edit: I could really only see it coming in use if you are pushing 300+ RWHP and have an ultralight flywheel so it revs in about 1/2 a second to redline.
As a little tidbit of info, my original 12A with 275000 KM on it went way past redline 3 times. I'm guessing 9000+ as the tach was pegged for at least 2 or 3 seconds. Only reason it went this high is because the throttle stuck open either because of my floor mat holding it under a WOT run or the choke linkage coming off and proping the throttle open.
#13
^ yea I agree, most of you people have no idea what your talking about though.
edit: ok that was a little harsh. Mostly the people who spout off about revving to anything in the region of 8k without damage. Have you never heard of apex seal chatter? or what happens when you try to **** mad fast yo and miss the gear and spin it up. a rev limiter is a good idea.
edit: ok that was a little harsh. Mostly the people who spout off about revving to anything in the region of 8k without damage. Have you never heard of apex seal chatter? or what happens when you try to **** mad fast yo and miss the gear and spin it up. a rev limiter is a good idea.
Last edited by BMS2004; 11-08-05 at 09:18 PM.
#14
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there is no point in going above redline since the power drops off around 7k, look at dyno graphs. you want to stay in the powerband, thus shifting is a good thing... unless ofcourse its the end of a autox track and shifting will drop you a precious 1/2 second.
#15
love the braaaap
Originally Posted by BMS2004
^ yea I agree, most of you people have no idea what your talking about though.
edit: ok that was a little harsh. Mostly the people who spout off about revving to anything in the region of 8k without damage. Have you never heard of apex seal chatter? or what happens when you try to **** mad fast yo and miss the gear and spin it up. a rev limiter is a good idea.
edit: ok that was a little harsh. Mostly the people who spout off about revving to anything in the region of 8k without damage. Have you never heard of apex seal chatter? or what happens when you try to **** mad fast yo and miss the gear and spin it up. a rev limiter is a good idea.
#16
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It's not just the peripherals you have to worry about... think of e-shaft flexing! Or degredation of stationary gears, side seals, etc....
To build an engine to go past redline, you need to replace/upgrade practically EVERYTHING. Just slapping in "apex seals and a crazy street port" won't up your engine's ability to survive higher-than-redline conditions.
And I didn't even mention cooling. If you've got the "beehive" water-to-oil cooler, it's barely sufficient for regular driving, let alone high-rpm operation. A proper air-oil cooler, a more powerful oil pump, a higher pressure oil bypass will all help with keeping oil temps low. A larger water pump (such as an S4's water pump) along with a better Rad (you can get custom large aluminum ones made) will help keep coolant temps down, and keep your engine safe.
As for installing a limiter, you'll either have to take Directfreak's advice and install an ignition controller, or switch to an engine with fuel injection and install a standalone fuel management system.
Your car comes with a buzzer installed and your car's driver SHOULD come with common sense installed... between these two the car should be fine. If not, perhaps either the car or driver should be replaced
Jon
To build an engine to go past redline, you need to replace/upgrade practically EVERYTHING. Just slapping in "apex seals and a crazy street port" won't up your engine's ability to survive higher-than-redline conditions.
And I didn't even mention cooling. If you've got the "beehive" water-to-oil cooler, it's barely sufficient for regular driving, let alone high-rpm operation. A proper air-oil cooler, a more powerful oil pump, a higher pressure oil bypass will all help with keeping oil temps low. A larger water pump (such as an S4's water pump) along with a better Rad (you can get custom large aluminum ones made) will help keep coolant temps down, and keep your engine safe.
As for installing a limiter, you'll either have to take Directfreak's advice and install an ignition controller, or switch to an engine with fuel injection and install a standalone fuel management system.
Your car comes with a buzzer installed and your car's driver SHOULD come with common sense installed... between these two the car should be fine. If not, perhaps either the car or driver should be replaced
Jon
Last edited by vipernicus42; 11-09-05 at 12:03 AM.
#17
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Originally Posted by BMS2004
^ yea I agree, most of you people have no idea what your talking about though.
edit: ok that was a little harsh. Mostly the people who spout off about revving to anything in the region of 8k without damage. Have you never heard of apex seal chatter? or what happens when you try to **** mad fast yo and miss the gear and spin it up. a rev limiter is a good idea.
edit: ok that was a little harsh. Mostly the people who spout off about revving to anything in the region of 8k without damage. Have you never heard of apex seal chatter? or what happens when you try to **** mad fast yo and miss the gear and spin it up. a rev limiter is a good idea.
#18
Originally Posted by mooseknuckle
sounds like you dont know how to drive yo.
Last edited by BMS2004; 11-09-05 at 01:45 PM.
#19
Originally Posted by 85rotarypower
Apex seals don't start to chatter untill 8400 rpm. I've heard of 12A's reved to 8000 regularily without any problems. Sure, there is no power up there, but sometimes you just accidentally rev up too much. I guess thats the whole point of this thread though. But the fact is, if you miss a gear shifting "mad quik", no rev limiter is going to save your engine.
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