Arrvaxx's quest for the 10s.

phunk · 08-28-2014, 04:46 PM

Generally, you always shift as late as you can due to torque multiplication. But when you have a scenario where gear A or gear B will BOTH just light up the tires anyway.... well in that case it makes no difference aside from what is easier to drive... and that will be the taller gear. If you still cant go full throttle in second anyway, then I would experiment with early shifting and seeing if you can do it without the car landing too low in the powerband in second. Otherwise, always shift as late as you can.

One thing I have noticed about my car, it doesnt like to shift while the wheels are spinning. I havent really sat down to think about that one... but I have observed that if I am in first gear banging the rev limiter from tire spin, its not going to let me into second (nasty grind) unless I let off for a moment. I assume the tires and drivetrain need to decelerate down for everything to be happy and allow the shift, just havent really thought about it yet.

GaleForce · 08-28-2014, 10:55 PM

Quote:

Originally Posted by phunk

Generally, you always shift as late as you can due to torque multiplication. But when you have a scenario where gear A or gear B will BOTH just light up the tires anyway.... well in that case it makes no difference aside from what is easier to drive... and that will be the taller gear. If you still cant go full throttle in second anyway, then I would experiment with early shifting and seeing if you can do it without the car landing too low in the powerband in second. Otherwise, always shift as late as you can.

one thing I have noticed about my car, it doesnt like to shift while the wheels are spinning. I havent really sat down to think about that one... but I have observed that if I am in first gear banging the rev limiter from tire spin, its not going to let me into second (nasty grind) unless I let off for a moment. I assume the tires and drivetrain need to decelerate down for everything to be happy and allow the shift, just havent really thought about it yet.

I have the same issue. I try to get out of first as fast as I can with reasonable throttle input, then mash *within reason* the right pedal from 2nd, on.

Mitco39 · 08-29-2014, 09:28 AM

Quote:

Originally Posted by GaleForce

I have the same issue. I try to get out of first as fast as I can with reasonable throttle input, then mash *within reason* the right pedal from 2nd, on.

Never thought of that before but you guys are right. Banging second gear can be difficult, it would be so awesome to have a torque limit per gear so you could contain it down low. Every other gear works flawlessly, I can no lift shift all the way down the track with no issues. Its just that 1-2 which kills the ET.

1cleanZ · 09-07-2014, 10:04 PM

Quote:

Originally Posted by phunk

Generally, you always shift as late as you can due to torque multiplication. But when you have a scenario where gear A or gear B will BOTH just light up the tires anyway.... well in that case it makes no difference aside from what is easier to drive... and that will be the taller gear. If you still cant go full throttle in second anyway, then I would experiment with early shifting and seeing if you can do it without the car landing too low in the powerband in second. Otherwise, always shift as late as you can.

One thing I have noticed about my car, it doesnt like to shift while the wheels are spinning. I havent really sat down to think about that one... but I have observed that if I am in first gear banging the rev limiter from tire spin, its not going to let me into second (nasty grind) unless I let off for a moment. I assume the tires and drivetrain need to decelerate down for everything to be happy and allow the shift, just havent really thought about it yet.

Quote:

Originally Posted by GaleForce

I have the same issue. I try to get out of first as fast as I can with reasonable throttle input, then mash *within reason* the right pedal from 2nd, on.

I've had this EXACT issue both on the drag strip, as well as the road course. 2 gears inparticular stick out to me, 3rd and 5th. I remember being on the straight stretch 4 laps in a row, and the car literally would NOT LET ME PUT IT INTO 5TH?? I was like, wtf, there is NO WAY that I simply cannot find the gear??? Then I realized when I lifted completely off the accelerator early and shifted early with no redline, it allowed it to go in.

This past weekend, I had the same issue going into 3rd, causing me to shift early and actually held the clutch in early, delayed, and then shifted just to make sure I could get a run in without the car refusing me to get it into 3rd.

THEN, of course the fuel starvation. Have had this on the road course, saying I had over a half tank, yet completely shut the car off in the middle of accelerating on the straight. Wouldn't start back up, disconnected the battery hoping it wasn't something electrical. Sure enough, once I reconnected, the fuel meters/lights were completely empty. Have also ran out of fuel/cut off during auto-x events and exit ramps on the way to events.

uggggh, the struggles of the 370, yet I still love this damn thing and can't get enough of ittttt!!!

Rid3_FaM0uS · 08-29-2014, 09:39 AM

Quote:

Originally Posted by phunk

Generally, you always shift as late as you can due to torque multiplication. But when you have a scenario where gear A or gear B will BOTH just light up the tires anyway.... well in that case it makes no difference aside from what is easier to drive... and that will be the taller gear. If you still cant go full throttle in second anyway, then I would experiment with early shifting and seeing if you can do it without the car landing too low in the powerband in second. Otherwise, always shift as late as you can.

One thing I have noticed about my car, it doesnt like to shift while the wheels are spinning. I havent really sat down to think about that one... but I have observed that if I am in first gear banging the rev limiter from tire spin, its not going to let me into second (nasty grind) unless I let off for a moment. I assume the tires and drivetrain need to decelerate down for everything to be happy and allow the shift, just havent really thought about it yet.

I too recall having that issue several times! id drop the car down into first to do a little pull and shifting at 7500-2nd gear my clutch would just screech instead of changing gears. makes me worry about no lift shift in my racelogic honestly I don't want to be causing inadvertent damage to a trans/clutch/flywheel.

08-28-2014, 04:46 PM	#1 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,669 Drives: 370 Rep Power: 974725	Generally, you always shift as late as you can due to torque multiplication. But when you have a scenario where gear A or gear B will BOTH just light up the tires anyway.... well in that case it makes no difference aside from what is easier to drive... and that will be the taller gear. If you still cant go full throttle in second anyway, then I would experiment with early shifting and seeing if you can do it without the car landing too low in the powerband in second. Otherwise, always shift as late as you can. One thing I have noticed about my car, it doesnt like to shift while the wheels are spinning. I havent really sat down to think about that one... but I have observed that if I am in first gear banging the rev limiter from tire spin, its not going to let me into second (nasty grind) unless I let off for a moment. I assume the tires and drivetrain need to decelerate down for everything to be happy and allow the shift, just havent really thought about it yet. 1cleanZ, GaleForce and DEpointfive0 like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph Last edited by phunk; 08-28-2014 at 04:51 PM.

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