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Old 07-06-2020, 07:57 PM   #1
MartinLe
 
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IS HITTING REV LIMITER HARMFUL?

I have been out practicing my launches and keeping track of my 60' times and 0-60 times. I hit the rev limiter every time I try to wring every bit of rpm out of my car. I am focused on the HUD tach and it never gets to 6500 before the motor falls away. My first question is, is this harmful to the motor when the rev limiter engages and cuts the power? I have also focused on the MPH and the rev limiter kicks in at 59 mph and strangely (to me) it appears that the car does not achieve 60 mph until l lift off the gas. I thought this car was capable of 63 mph in first gear? Is my technique the problem? Any suggestions on this issue?
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Old 07-06-2020, 08:16 PM   #2
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the limiter is there to prevent a catastrophic problem but hitting the limiter like that isn't harmful. A mechanical over rev is another problem entirely. I personally have hit the limiter at least 10 times...maybe 20 at VIR. The little hiccup you feel is a fuel cutoff/spark limiter.
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Old 07-06-2020, 08:20 PM   #3
MartinLe
 
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Thanks.
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Old 07-06-2020, 09:51 PM   #4
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Quote:
Originally Posted by MartinLe View Post
I have been out practicing my launches and keeping track of my 60' times and 0-60 times. I hit the rev limiter every time I try to wring every bit of rpm out of my car. I am focused on the HUD tach and it never gets to 6500 before the motor falls away. My first question is, is this harmful to the motor when the rev limiter engages and cuts the power? I have also focused on the MPH and the rev limiter kicks in at 59 mph and strangely (to me) it appears that the car does not achieve 60 mph until l lift off the gas. I thought this car was capable of 63 mph in first gear? Is my technique the problem? Any suggestions on this issue?
Hitting the rev limiter is not too bad but don't make a habit of it, it's not a good thing.

I will say that hitting the rev limiter in 1st gear doesn't sound like a good way to drive/shift, you need to shift earlier in 1st especially with this car and the TQ in 2nd. When I hit it on canyons it's always in 2nd. Or 3rd/4th on the track.
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Old 07-06-2020, 10:08 PM   #5
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No.
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Old 07-06-2020, 10:55 PM   #6
Hell Raiser
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It is when you hear a big bang then you know it is harmful.
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Old 07-06-2020, 10:57 PM   #7
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I've hit the rev limiter once on my 2020 2SS, it was pretty eye opening... I was in manual mode and was coming down an on ramp and had it to the floor... I was a tad late paddle shifting (using the HUD tach and being "drunk" from the sound of the NPP in "Track Mode" singing a magical tune) and holy crap, it was like someone pulled the rug out on me... My wife gave me the "If you break this damn car doing this crap you aren't getting another one" look... From now on, if I'm really going to romp on it, I'm just gonna stick it in "D" and let the computers do a much better job than I can...
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Old 07-07-2020, 04:42 PM   #8
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Quote:
Originally Posted by SFV1LE View Post
Hitting the rev limiter is not too bad but don't make a habit of it, it's not a good thing.

I will say that hitting the rev limiter in 1st gear doesn't sound like a good way to drive/shift, you need to shift earlier in 1st especially with this car and the TQ in 2nd. When I hit it on canyons it's always in 2nd. Or 3rd/4th on the track.
I am not waiting for the rev limiter to tell me to shift. My problem was waiting until it too close to redline to shift (yah, yah I've been called worse). Now I am letting off of the gas as soon as the tach hits 6000. I guess the lag between my seeing it hit 6000 and the time I actually let of the gas allows me to hit 60 mph. I've seen it register 61 once.
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Old 07-07-2020, 10:35 PM   #9
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The hud output seems to be delayed slightly (both rpms and speed) which is noticeable on 1st gear upshifts and when trying to brake hard to a specific mph. I was ending up about 10mph lower than desired on entry to one corner at a track day due to the HUD lag until I stopped waiting for my desired speed to appear on the HUD before taking my foot off of the brake pedal.

For upshifts you can probably find a lower mph # displayed on the HUD to use as your shift point in order to get the 1-2 shift to happen consistently right around 6500rpm on the physical tach needle without hitting the rev limiter assuming you are always full throttle and not losing traction.
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Old 08-13-2020, 12:23 PM   #10
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My hits the rev limiter at the top of 1st and sometimes 2nd at WOT. It's annoying and probably could be tuned out of the ECU but it's harmless
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Old 08-13-2020, 12:58 PM   #11
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Quote:
Originally Posted by SFV1LE View Post
Hitting the rev limiter is not too bad but don't make a habit of it, it's not a good thing.

I will say that hitting the rev limiter in 1st gear doesn't sound like a good way to drive/shift, you need to shift earlier in 1st especially with this car and the TQ in 2nd. When I hit it on canyons it's always in 2nd. Or 3rd/4th on the track.
Yeah, that's my thought too.

The rev limiter is generally either cutting fuel or cutting spark. Cutting fuel can create a temporary lean spike which is deadly on some highly boosted turbocharge cars, while cutting spark will rain pain on the catalytic converter. Not sure which one the Camaro ZL1 uses. Maybe it cuts both.

Quote:
Originally Posted by 2SS Capt View Post
I've hit the rev limiter once on my 2020 2SS, it was pretty eye opening... I was in manual mode and was coming down an on ramp and had it to the floor... I was a tad late paddle shifting (using the HUD tach and being "drunk" from the sound of the NPP in "Track Mode" singing a magical tune) and holy crap, it was like someone pulled the rug out on me... My wife gave me the "If you break this damn car doing this crap you aren't getting another one" look... From now on, if I'm really going to romp on it, I'm just gonna stick it in "D" and let the computers do a much better job than I can...
So Camaro A10 doesn't automatically upshift in manual mode, then.

I have driven some other cars(mostly family cars) that will upshift for you if you hit the redline in manual mode.
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Old 08-13-2020, 01:04 PM   #12
JSH


 
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My comments are based on driving in Auto both in Sport or Track mode
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650.
100+ octanes, no eth, no meth, no N2O.
2/23 - 1031/1004 wheel.
4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes).
2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.
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Old 08-13-2020, 01:04 PM   #13
2SS Capt
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Quote:
Originally Posted by UnknownJinX View Post
Yeah, that's my thought too.

The rev limiter is generally either cutting fuel or cutting spark. Cutting fuel can create a temporary lean spike which is deadly on some highly boosted turbocharge cars, while cutting spark will rain pain on the catalytic converter. Not sure which one the Camaro ZL1 uses. Maybe it cuts both.



So Camaro A10 doesn't automatically upshift in manual mode, then.

I have driven some other cars(mostly family cars) that will upshift for you if you hit the redline in manual mode.
Nope, or at least it didn't that time... Feel on its face...
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Added after delivery: - GMP CAI, GMP Black Strut Tower Brace, MRR017 1LE Wheels, SS Armrest, Black Fuel Door, Stainless Sport Pedals, SS Wheel Caps, Black Lugs/Locks, GM Splash Guards, DD Smoked LED Markers, Smoked Rear Reflectors, Mishimoto Catch Can, Xpel PPF - Full Front, SunTek 35% Tint, CeramicPro coating, RST Stainless Brake Lines, Castrol SRF, MSD Super Conductor Wires

Left: My "fun" ride. Right: My "work" ride: a Gulfstream G600. One's top speed is 180 Mph, the other, 620 Mph...
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Old 08-13-2020, 05:18 PM   #14
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Have done it a couple times at the drag strip when I forget to put it back in auto after the burnout.

Falls right on its face, noses over, and no harm.
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