Transmission cuts throttle on AT
 

Hey guys,
Has anyone experienced the throttle cut or abnormal transmission behavior after right corners during track days?
The situation is following: during track path after few right corners an AT doesn’t shift for some while with supporting rev like sound, then rapidly shifts with kick.
Recently when I was on track (kart track) It happened after particularly two corners, the throttle cuts and car doesn’t shift for about two seconds then rapidly kicked and shifted up with rev sound
Could it be an oil level or oil valve problem ?
First I thought that it is because of overheating and installed HKS AT cooler, but this problem remained
Thanks in advance

Sounds like fuel starve. Common on right hand turns.

I agree with lj909...how much fuel did you have when this starting happening? I've heard that some can have 1/2 tank or less for fuel starvation to occur.

i've seen some have had fuel starve with 3/4 full tank on really hard rights.

At that moment I had about half of tank

My guess is AT, going to check the fluid level then inspect valve along with pan

half tank and a hard turn especially on a track it's def fuel starve.

i'd say fill it up try again before tearing the tranny apart considering it's meant to be a sealed unit.

also, what mods are on your car? is it tuned? if so, did they tune the line pressure on the tranny?

It couldn’t be fuel starvation as I understand, cause first time I had that strange delay in shifting I ran full tank of gasoline. Topped up just before hitting the track

Engine Mods are:
Cams, Lth, exhaust, intake, ignition coils, oil pump, oil pan, Impul Ecu and coolers (oil, AT and power steering)

Sounds like a fuel starvation and/or a fuel related issue.

If you are convinced it is not Fuel starve, then could be stability control.

I'm assuming VDC is OFF but if the yaw sensor is not isolated, the residual nannies are still active.

Plug the following string into Google and read what you find

site: the370z.com "diy yaw sensor"

Highly likely that cracking open the trans is taking you deep into the rabbit hole and the only thing down there is the dark.

Also are you sure you are not bouncing off the rev limiter with manual shift ??

Now I'm completely confused :icon17:
But sounds true to me. When it happens I feel like VDC isn't completely off, like something is trying to hold the torgue and doesnt allow to accelerate or shift. My mates first asked me when they saw that: "Is your VDC off?" So I bet on yaw sensor now