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Driving to work this morning I hit the throttle hard in 1st gear and hit red line before shifting into 2nd gear. The engine responded accordingly by shutting down for a brief second until I let off the gas and shifted into 2nd gear. Now I know what it means to over rev your engine by down shifting into the wrong gear and revving the RPM's over red line, but does the same apply to hitting red line on an upshift? Curious to know if this would register as an over rev during a PPI.
You hit the rev limiter. You probably incurred some Stage 1, maybe Stage 2 ignitions on the DME.
A "Money Shift" is when you over rev the engine by downshifting, say when you mean to go into fourth gear but muscle memory fails and you go into second on accident. The rev limiter cuts fuel when accelerating beyond a certain rpm, thus stopping the acceleration. During a missed shift, the momentum is already there so cutting the fuel doesn't do anything. This causes the "Dangerous" range 4-6 ignition occurrences.
No problem. Live & learn. Red line in 1st come up very fast. Gotta be ready to grab 2nd about 200-400 rpm early. Hopefully your oil was up to about 180 before this happened. That would be my only concern.
Thanks guys, car had been driven for 30 minutes and oil temp was at 200. Sounds like all is good here. Only the second time I have redlined since I bought the car three years ago. I appreciate the quick response. Have a great day!!!
... Now I know what it means to over rev your engine by down shifting into the wrong gear and revving the RPM's over red line,.
No, you do not know. A 'money shift' does not trigger the rev limiter. Trust me, you do not want to know/experience a wrong/overreved downshift.
As others posted, you caused a harmeless rev limiter event. Now, since you stated this happened in the morning, more importantly, was the engine oil up to temp when you did this?
Bouncing off the rev limiter is a fact of life if you drive your car hard. The limiter is there to prevent the car from being damaged during your exuberant driving, and it's not a terrible or grossly irresponsible thing to tickle the rev limiter once in a while.
Over-revving a car on a downshift is a fact of life for people who fail hard. This forces the motor to spin faster than it was designed to operate; the results might be minor, or non-existent, or catastrophic - maybe at the time it happened, or maybe a little further down the road.
I had no issues with a few red-line ignitions when I was evaluating Porsches, but IMO cars with downshift over-revs are to be avoided...
OP, if you ever want to see other people people burning some money, watch YouTube videos of missed shifts during races. There is a sick pleasure watching some kid blow up his car with a 4-1 downshift instead of a 4-3.
No. It's a fact of not upshifting sooner. You can still drive hard and shift on time.
What do I know, but isn't peak torque/hp several hundred RPMs below redline, so what would be the point of bouncing off the limiter (versus shifting to a more apprpriate gear)?
What do I know, but isn't peak torque/hp several hundred RPMs below redline, so what would be the point of bouncing off the limiter (versus shifting to a more apprpriate gear)?
Not saying it was the case here but taking a gear to redline drops you into best power range of next gear. You essentially maximize the area underneath the power curve by shifting at redline.
03-30-2016, 10:30 AM
Red Line Equal Over Rev?
This forces the motor to spin faster than it was designed to operate; the results might be minor, or non-existent, or catastrophic - maybe at the time it happened, or maybe a little further down the road.
