Launch control 1st to 2nd shift rev limiter

[Ulikefishsticks]

So I was out yesterday driving the last few miles in my Michelin PS4S before new tires on tomorrow and I noticed something. I rarely use launch control and I decided for some reason to use it. Now I don't remember the last time I have used LC but I never heard engine bouncing off the rev limiter before. Is this something that happens on stock cars? The only thing I had on at the time was a Borla Catback and intakes. I had the JB4 off at the time. I had picked it up on my dashcam so I'll post it here once I get it on youtube. I'm not saying this as a bad thing, I think it sounded nice. Will this only happen using LC?

 

[P22Tyler]

Mine has never hit the rev limiter after using LC. Admittedly I use mine sparingly as well though.

 

[STINGER]

It will do it sometimes on my car, with the extra power I think things are happening too fast for the ECU.

 

[Travis Wills]

I hit the REV limiter some times when my RWD Stinger spins the tires off. It usually cuts throttle then as well.

 

[AWDGT2]

So I was out yesterday driving the last few miles in my Michelin PS4S before new tires on tomorrow and I noticed something. I rarely use launch control and I decided for some reason to use it. Now I don't remember the last time I have used LC but I never heard engine bouncing off the rev limiter before. Is this something that happens on stock cars? The only thing I had on at the time was a Borla Catback and intakes. I had the JB4 off at the time. I had picked it up on my dashcam so I'll post it here once I get it on youtube. I'm not saying this as a bad thing, I think it sounded nice. Will this only happen using LC?

Your not bouncing off the limiter, that's your throttle shutting down for your automatic shift, quite normal. Every stinger does it. It has nothing to do with LC either, it's just normal shifting for 1-2 in the stinger.

 

[Ulikefishsticks]

Ah, I guess that explains it. However I have only heard it twice and both times was using LC.

 

[MerlintheMad]

"Bouncing" off the red: I get this all the time if I don't shift first (using the paddles is my MO). If I'm a bit slow on the upshift, the car takes over shifting for me: and yes, the needle bounces clear into the red zone and then takes over upshifting unless I resume manual shifting. LC makes no difference; the few times I've used LC the shift from 1st to 2nd takes the needle into the red zone; but not after that; the upshifts are smooth and happen close to 6K RPM but no further.

 

[AWDGT2]

"Bouncing" off the red: I get this all the time if I don't shift first (using the paddles is my MO). If I'm a bit slow on the upshift, the car takes over shifting for me: and yes, the needle bounces clear into the red zone and then takes over upshifting unless I resume manual shifting. LC makes no difference; the few times I've used LC the shift from 1st to 2nd takes the needle into the red zone; but not after that; the upshifts are smooth and happen close to 6K RPM but no further.

His comment was Bouncing off the rev limiter, not red. All our cars will auto shift in the red. He thought the car hit the limiter when he heard the pop but that was the throttle closing between shifts, absolute normal behavior.

 

[MerlintheMad]

Ah, my mistake. So, the needle was observed to bounce off the needle stop? Never heard of that before. You're saying it didn't happen.

His comment was Bouncing off the rev limiter, not red. All our cars will auto shift in the red. He thought the car hit the limiter when he heard the pop but that was the throttle closing between shifts, absolute normal behavior.

 

[AWDGT2]

LOL, no... he's using a figure of speech. Bounding off the rev limiter. He thought the car revved so high that the motor cut. There is no way possible for that to happen while in D. What he "heard" was the throttle cut. Even paddle shifting like you explained above, the car will shift for you just above the 6k.

 

[P22Tyler]

Your not bouncing off the limiter, that's your throttle shutting down for your automatic shift, quite normal. Every stinger does it. It has nothing to do with LC either, it's just normal shifting for 1-2 in the stinger.

Agreed, just watched the video and it doesn't sound like the rev limiter to me either.

 

[Ulikefishsticks]

What does it sound like when hitting the rev limiter vs throttle cutting. I'm assuming the rev limiter is something that would come in to play if the car did not automatically upshift for you past 6k. I guess I was just ignorant to the difference between the two. The more you know. Is it just me who enjoys that sound then? So is this a comparable sound to the 'DSG farts' in some audi's and VW's? Again, I apologize for the ignorance haha.

 

[MerlintheMad]

Even paddle shifting like you explained above, the car will shift for you just above the 6k.

That sounds right. I see/feel the upshift and the moment between gears the engine lets go and the needle "bounces" into the red zone. But the RPMs going up is only that instant when the engine isn't under load.

 

[turboAWD]

It's been over a year, so I'm only 95% sure now, but I can bounce off the rev limiter in my '19 gt1 awd. Might be throttle cut, or whatever it uses, but I've done it. Stage 2 "disable traction" (i.e. what you need to enable launch control) and THEN in manual shift mode (move the shift lever over to the left), I can bounce off the the rev limiter. I think it auto-shifts out of 1st, but 2nd, 3rd, etc. it won't auto-shift.

I don't drive in that mode often, so I can't remember every detail. 1st stage "disable traction", it will upshift when it hits the red zone, even in manual mode. This was one of the "pros" of the gt1 old-school shifter for me. Not sure if a gt2 also has a way to emulate that.

 

[AWDGT2]

@turboAWD By stage 2 and stage1 I assume you're referring to Tork? If so, yes an ECU tune can definitely bypass the build in Nanny from KIA.

 

[jerryyas5]

So I was out yesterday driving the last few miles in my Michelin PS4S before new tires on tomorrow and I noticed something. I rarely use launch control and I decided for some reason to use it. Now I don't remember the last time I have used LC but I never heard engine bouncing off the rev limiter before. Is this something that happens on stock cars? The only thing I had on at the time was a Borla Catback and intakes. I had the JB4 off at the time. I had picked it up on my dashcam so I'll post it here once I get it on youtube. I'm not saying this as a bad thing, I think it sounded nice. Will this only happen using LC?

Launch control is useless. install the burn out switch. Or just cut the brake switch wire to the ECU. You can hold the brake pedal and give it gas up to 3000 RPMs before you launch off. the ecu doesn’t seem to give it gas when stepping on the brakes

 

[turboAWD]

@turboAWD By stage 2 and stage1 I assume you're referring to Tork? If so, yes an ECU tune can definitely bypass the build in Nanny from KIA.

No, by stage 1 I meant, push "disable traction control" for 1 second, stage 2, push and hold for 3-5 seconds until you get the beep and "more" disabling of traction control (there's still a bit in there somewhere).

I have a stock ECU with jb4. I've bounced off the rev limiter in manual mode with "stage 2 traction disable". It didn't shift, but kept bouncing - on purpose, obviously.

 

[AWDGT2]

@turboAWD That's a new one to me, I don't doubt you though. Normally the car will cut throttle and shut down well before that happens. I'd keep an eye on it.

 

[turboAWD]

@turboAWD That's a new one to me, I don't doubt you though. Normally the car will cut throttle and shut down well before that happens. I'd keep an eye on it.

Well, it COULD have been throttle cut - I was just describing the up/down/up/down hover near red-line that is like a rev limiter, regardless of how it's implemented. In my Legacy GT, IIRC, it was fuel cut and a HUGE wallop, so I had my tuner take out some of the harshness..

 

[G70 Owner]

No, by stage 1 I meant, push "disable traction control" for 1 second, stage 2, push and hold for 3-5 seconds until you get the beep and "more" disabling of traction control (there's still a bit in there somewhere).

I have a stock ECU with jb4. I've bounced off the rev limiter in manual mode with "stage 2 traction disable". It didn't shift, but kept bouncing - on purpose, obviously.

My G70 does this. Scared me the first time because I forgot I had the paddles active along with stage 2 everything off. I thought the stinger and g70 TC behavior was the same it’s crazy to hear that some people can’t bounce off the limiter