Fuel cut rev limiter dangerous. This is called a soft .
Fuel cut rev limiter dangerous Most tuners will refer to rev limiters in two ways. Also the MSD 6AL-2 will cut the ignition (which I'm planning on using for the 2-step limiter). And creates fun fireballs! With an ignition cut rev limit and a significant amount of ignition retard, we're able to build essentially any amount of boost we wanted and we were usually leaving the line with that particular car between 20 and 25 psi of boost. A 2-3 hundred rpm later it will hit a hard limit and cut all injectors and spark. One is called a “soft cut” rev limiter and a “hard cut” rev limiter. 09:18: So this will not work effectively if you are using a fuel cut rev limit. just b-4 the limiter kicks in! Dec 8, 2012 · If the motor (615ci BBC) is on the rev limiter (MSD 7al3) at 7800 coming over the line, does this do damage to the motor (bearing, rods, crank, etc)? Feb 24, 2011 · The main argument against this is the fact that once fuel is removed completely, there is not enough combustive power (even if it pre-ignites) to cause a significant detonation event. Jan 23, 2009 · It is been some time since I was looking into the 02-07 ECUS, but it will initially cut the fuel to two cylinders (or was it on half the revolutions) in what some refer to a soft rev limiter. On a soft cut limiter the timing is retarded to the point that the motor can no longer rev higher. Fuel cut off or fuel cut is typically used as a rev limiter in factory vehicles or diesels. p. Oct 15, 2001 · Hitting the rev limiter cuts off the injectors and spark to prevent engine damage. 09:23 A rev limiter works by either retarding the timing or cutting the fuel to the motors cylinders. The reason Mazda fitted a fuel cut instead of ignition is because the unburnt fuel that gets dumped into the exhaust with an IC system destroys the cat. 0 in my tune) and set the Spark Only Torque Ratio for the same "Engine Speed Limit" to 0. Nov 27, 2013 · Yes, I fully admit I have logging issues. Aug 18, 2004 · Is it dangerous to hit a rev limiter at high rpms under a lot of boost? I often like to slam the rev limiter when I'm racing because it creates a lot of exhaust and helps get rid of lag between gears. Aug 20, 2014 · For this reason, fuel cut is definitely the safer, cleaner alternative, and this is why OEMs use a fuel cut for their factory rev limiters and launch control systems. 0 (currently already 0. I suppose a reason for Mits feathering the fuel up top is so that people can ride the limiter, especially for competition. So I guess its a standard features in some cars. Feb 22, 2010 · With the MegaSquirt 2 I can use either an ignition cut, a fuel cut or I believe cut both for the rev limiter. And installs an ignition cut that kicks in when the factory one would. May 29, 2023 · I tried it once in a manual trans car with EFI, set the limiter to 3000 on a supercharged windsor pure street car. Feb 22, 2010 · Re: Rev limiting, Fuel or Ignition cut? Funny you should mention the sound with a 2-step at 2300rpm, because when I hook up the MSD 2-step at ~2500rpm limit, I'm going to see if I can modify the VE table bucket for WOT and 2500rpm to still run and minimize funky noises (like cut fuel there, but it may cause a hiccup and bog when the clutch grabs and has to pass through that spot again) Nov 25, 2008 · Well I dont see it happening in my Swift, however when I play Race 07, GTR Evolution, the same thing happens with the cars in the Sim. m. This makes it pretty dangerous spraying and bumping the limiter. As soon as you hit the rev limiter and dont upshift, the car starts loosing speed, and rev counter fluctuating as if running out of gas. This is called a soft Sep 20, 2017 · S2H, I think what people are concerned about with a fuel cut rev limiter, is that with any IDC over 25%, some of the fuel is being sprayed on a closed valve. The counter argument being that yes, there is enough residual fuel to det and cause damage. See full list on offroadhandbook. com Feb 1, 2007 · while the fuel is cut to limit the revs, it cuts it completely so there isn't really much heat. I'm going to add some spark retard to create a soft limiter to reduce the chance of any more mechanical damage to the bottom end. Is that a bad idea? Does it depend on what type of rev limiter you're using? ignition cut Based on the above, to achieve my goal of having a spark only (no fuel cut) rev limiter, I should set the Fuel Cut Torque Ratio for "Engine Speed Limit" to 0. Fuel cut you could hardly focus on the road even with the hysteresis set low, ignition cut in comparison could put a full teacup on the dashboard, and it blew pretty fire out the exhaust. Oct 5, 2016 · My 4AGE has a spark cut limiter set 200rpm above the fuel cut limiter to prevent overshoots, which it absolutely can do if you rev the engine out of gear. Anyway, Nistune’s launch control system can be triggered in one of two ways: speed-based, or toggle-based. 00). so, generally, there's two ways of an ECU applying a rev limiter, and these are either through fuel cutting, or through ignition cutting. 00 (currently 1. Now, on top of that, we do, as you have mentioned, have a soft rev limiter and a hard rev limiter. it is just sparking into air, not into a really lean mixture, or if there was and fuel vapour it would be creating less heat than what a full amount of fuel would. When the engine reach a certain speed, the ECu begins to reduce the amount of fuel going into the cylinder to maintain an RPM. The reason is that fuel cut limiters are dangerous in forced induction cars. Is it good to do this often, I'm not sure just learn to hit the gear box and know the engine sound at the right r. Depending on when the ECU cuts the fuel, there may be a less than desired, residual fuel that enters the cylinder and is lit off. Beside, completely shutting down fuel is probably overly conservative to the point of dangerous, because all you get to do now is wait for RPMs to drop before you can drive the car again. sikhwxgfrwkrxuclvtkdfkejpfdkptyutfpnygbdxkejfixmzcoajvmiphndybxetqmgzmbpqufeqawhk
Fuel cut rev limiter dangerous Most tuners will refer to rev limiters in two ways. Also the MSD 6AL-2 will cut the ignition (which I'm planning on using for the 2-step limiter). And creates fun fireballs! With an ignition cut rev limit and a significant amount of ignition retard, we're able to build essentially any amount of boost we wanted and we were usually leaving the line with that particular car between 20 and 25 psi of boost. A 2-3 hundred rpm later it will hit a hard limit and cut all injectors and spark. One is called a “soft cut” rev limiter and a “hard cut” rev limiter. 09:18: So this will not work effectively if you are using a fuel cut rev limit. just b-4 the limiter kicks in! Dec 8, 2012 · If the motor (615ci BBC) is on the rev limiter (MSD 7al3) at 7800 coming over the line, does this do damage to the motor (bearing, rods, crank, etc)? Feb 24, 2011 · The main argument against this is the fact that once fuel is removed completely, there is not enough combustive power (even if it pre-ignites) to cause a significant detonation event. Jan 23, 2009 · It is been some time since I was looking into the 02-07 ECUS, but it will initially cut the fuel to two cylinders (or was it on half the revolutions) in what some refer to a soft rev limiter. On a soft cut limiter the timing is retarded to the point that the motor can no longer rev higher. Fuel cut off or fuel cut is typically used as a rev limiter in factory vehicles or diesels. p. Oct 15, 2001 · Hitting the rev limiter cuts off the injectors and spark to prevent engine damage. 09:23 A rev limiter works by either retarding the timing or cutting the fuel to the motors cylinders. The reason Mazda fitted a fuel cut instead of ignition is because the unburnt fuel that gets dumped into the exhaust with an IC system destroys the cat. 0 in my tune) and set the Spark Only Torque Ratio for the same "Engine Speed Limit" to 0. Nov 27, 2013 · Yes, I fully admit I have logging issues. Aug 18, 2004 · Is it dangerous to hit a rev limiter at high rpms under a lot of boost? I often like to slam the rev limiter when I'm racing because it creates a lot of exhaust and helps get rid of lag between gears. Aug 20, 2014 · For this reason, fuel cut is definitely the safer, cleaner alternative, and this is why OEMs use a fuel cut for their factory rev limiters and launch control systems. 0 (currently already 0. I suppose a reason for Mits feathering the fuel up top is so that people can ride the limiter, especially for competition. So I guess its a standard features in some cars. Feb 22, 2010 · With the MegaSquirt 2 I can use either an ignition cut, a fuel cut or I believe cut both for the rev limiter. And installs an ignition cut that kicks in when the factory one would. May 29, 2023 · I tried it once in a manual trans car with EFI, set the limiter to 3000 on a supercharged windsor pure street car. Feb 22, 2010 · Re: Rev limiting, Fuel or Ignition cut? Funny you should mention the sound with a 2-step at 2300rpm, because when I hook up the MSD 2-step at ~2500rpm limit, I'm going to see if I can modify the VE table bucket for WOT and 2500rpm to still run and minimize funky noises (like cut fuel there, but it may cause a hiccup and bog when the clutch grabs and has to pass through that spot again) Nov 25, 2008 · Well I dont see it happening in my Swift, however when I play Race 07, GTR Evolution, the same thing happens with the cars in the Sim. m. This makes it pretty dangerous spraying and bumping the limiter. As soon as you hit the rev limiter and dont upshift, the car starts loosing speed, and rev counter fluctuating as if running out of gas. This is called a soft Sep 20, 2017 · S2H, I think what people are concerned about with a fuel cut rev limiter, is that with any IDC over 25%, some of the fuel is being sprayed on a closed valve. The counter argument being that yes, there is enough residual fuel to det and cause damage. See full list on offroadhandbook. com Feb 1, 2007 · while the fuel is cut to limit the revs, it cuts it completely so there isn't really much heat. I'm going to add some spark retard to create a soft limiter to reduce the chance of any more mechanical damage to the bottom end. Is that a bad idea? Does it depend on what type of rev limiter you're using? ignition cut Based on the above, to achieve my goal of having a spark only (no fuel cut) rev limiter, I should set the Fuel Cut Torque Ratio for "Engine Speed Limit" to 0. Fuel cut you could hardly focus on the road even with the hysteresis set low, ignition cut in comparison could put a full teacup on the dashboard, and it blew pretty fire out the exhaust. Oct 5, 2016 · My 4AGE has a spark cut limiter set 200rpm above the fuel cut limiter to prevent overshoots, which it absolutely can do if you rev the engine out of gear. Anyway, Nistune’s launch control system can be triggered in one of two ways: speed-based, or toggle-based. 00). so, generally, there's two ways of an ECU applying a rev limiter, and these are either through fuel cutting, or through ignition cutting. 00 (currently 1. Now, on top of that, we do, as you have mentioned, have a soft rev limiter and a hard rev limiter. it is just sparking into air, not into a really lean mixture, or if there was and fuel vapour it would be creating less heat than what a full amount of fuel would. When the engine reach a certain speed, the ECu begins to reduce the amount of fuel going into the cylinder to maintain an RPM. The reason is that fuel cut limiters are dangerous in forced induction cars. Is it good to do this often, I'm not sure just learn to hit the gear box and know the engine sound at the right r. Depending on when the ECU cuts the fuel, there may be a less than desired, residual fuel that enters the cylinder and is lit off. Beside, completely shutting down fuel is probably overly conservative to the point of dangerous, because all you get to do now is wait for RPMs to drop before you can drive the car again. sikh wxg frwkrxu clvtkdfk ejpfd kptyut fpny gbdx kejfix mzco ajvmip hndybxetq mgzmb pqufe qawhk