She's acting up....

bloodo · 02-20-2010, 12:27 PM

I think this is calls momentum. Unless you guys shift it to a very low gear, where the rpm needs to maintain the same speed is significantly more, then you will likely not see engine breaking just by lifting off the pedal. Example: just accelerate, downhill, level pavement, etc.

As speedworks described, he takes a turn at a significant speed, that speed will maintain because of the angular momentum. Not sure what gear he is normally in, but if taking a sharp turn at like 4th or 5th gear going 65mph, simply lifting of the gas pedal will not slow the car down because the rpm needs to maintain the speed is still low. This is just an example.

speedworks · 02-20-2010, 12:42 PM

Its not momentum, trust me, I have lots of experience at speed (on a track), and know how a car should feel/act in turns. The problem my car has, and I can assume others as well have, is that the car maintains a throttle in these situations. Its not normal, and hopefully I will be able to recreate it with a tech in the car. It does it for seconds in a long sweeping turn, so there is enough time for the car to slow (and when I say slow, I mean 1mph), you can hear the throttle (through the exhaust note not changing), until the situation changes (brakes or straightening) and then it releases the throttle. My guess is something with the g forces are causing a sensor to change.

KillerBee370 · 02-20-2010, 12:45 PM

Yes.. it's called momentum. It's also called a heavy flywheel coupled with the fact that the engine has rev-matched so the rpm's are a spinnin!

I still have this somewhat even with my lightweight flywheel but not nearly as much as the heavy stocker.

speedworks · 02-20-2010, 12:52 PM

Quote:

Originally Posted by KillerBee370

Yes.. it's called momentum. It's also called a heavy flywheel coupled with the fact that the engine has rev-matched so the rpm's are a spinnin!

I still have this somewhat even with my lightweight flywheel but not nearly as much as the heavy stocker.

Oh yeah, forgot to say, I don't use the SRM, so at the point this is happening, I am already in a gear (usually I am in 3rd at the time) for quite a few seconds.

02-20-2010, 12:42 PM	#2 (permalink)
speedworks Track Member Join Date: Jan 2009 Location: Boston, MA Posts: 550 Drives: PW purchased 01/09 Rep Power: 19	Its not momentum, trust me, I have lots of experience at speed (on a track), and know how a car should feel/act in turns. The problem my car has, and I can assume others as well have, is that the car maintains a throttle in these situations. Its not normal, and hopefully I will be able to recreate it with a tech in the car. It does it for seconds in a long sweeping turn, so there is enough time for the car to slow (and when I say slow, I mean 1mph), you can hear the throttle (through the exhaust note not changing), until the situation changes (brakes or straightening) and then it releases the throttle. My guess is something with the g forces are causing a sensor to change. Last edited by speedworks; 02-20-2010 at 12:45 PM.

02-20-2010, 12:27 PM	#1 (permalink)
bloodo Base Member Join Date: May 2009 Location: Nebraska Posts: 93 Drives: . Rep Power: 18	I think this is calls momentum. Unless you guys shift it to a very low gear, where the rpm needs to maintain the same speed is significantly more, then you will likely not see engine breaking just by lifting off the pedal. Example: just accelerate, downhill, level pavement, etc. As speedworks described, he takes a turn at a significant speed, that speed will maintain because of the angular momentum. Not sure what gear he is normally in, but if taking a sharp turn at like 4th or 5th gear going 65mph, simply lifting of the gas pedal will not slow the car down because the rpm needs to maintain the speed is still low. This is just an example.

02-20-2010, 12:45 PM	#3 (permalink)
KillerBee370 A True Z Fanatic Join Date: Mar 2009 Location: So Cal baby! Age: 53 Posts: 5,964 Drives: with passion Rep Power: 323	Yes.. it's called momentum. It's also called a heavy flywheel coupled with the fact that the engine has rev-matched so the rpm's are a spinnin! I still have this somewhat even with my lightweight flywheel but not nearly as much as the heavy stocker.