[Levanime]

Hi guys,

Car: N54, ST, MT, JB4 G5, Rear O2 sensors disabled,

As title says, as usual im getting HUGE lag post shift,
just rarely its fine.

Lag is so big that there is no sense to race,
as, as soon as i shift, other cars go too far while im in lag.

it does not matter if i shift slowly or fast

Interesting point is, 1 to 2 gear shift is more or less fine,
the biggest problem is 3 to 4 gear shift

any advice?
what to look at?

[335NJ]

Most common issue with the MT, I hear you.

Have you tried auto shift boost redux - 0?

Also, which firmware are you using?

[Levanime]

Originally Posted by 335NJ

Most common issue with the MT, I hear you.

Have you tried auto shift boost redux - 0?

Also, which firmware are you using?

Yes I've reduced it to 0,
firmware is pump from BMS,

Terry has advised to use NLS/2Step,
ordered, will be trying\

[BQTuning]

Post shift lag is tuning related, and not the nature of the beast. I also have a 6MT N54 and have tuned countless of them and they have no post shift lag provided you have the CDV delete

[Mike@N54Tuning.com]

I saw your other thread. Your lag is from traditionally shifting a large single turbo with boost venting during shifts. The NLS system should improve that. As would a smaller turbo or faster shifts.

[Grand_hustle17]

I am having this exact same problem with stock twins.. Its almost as if the car doesnt even know youve shifted. Then its rolling then a sec later boost kicks in.. Quite disappointing n troubling

[335NJ]

Originally Posted by BuraQ

Post shift lag is tuning related, and not the nature of the beast. I also have a 6MT N54 and have tuned countless of them and they have no post shift lag provided you have the CDV delete

I use the M3 CDV, and it helped.

But you're right, the proper method is to actually correct what's going on with a tune.

[Mike@N54Tuning.com]

Originally Posted by Grand_hustle17

I am having this exact same problem with stock twins.. Its almost as if the car doesnt even know youve shifted. Then its rolling then a sec later boost kicks in.. Quite disappointing n troubling

There are 4 different types of shift bog/delay. You'd have to log yours and have a professional look at that log to identify it and then from that you can figure out how to solve it.

Mike

[Grand_hustle17]

I think one was done on mine from previous owner but even still.

[Levanime]

Originally Posted by Mike@N54Tuning.com

I saw your other thread. Your lag is from traditionally shifting a large single turbo with boost venting during shifts. The NLS system should improve that. As would a smaller turbo or faster shifts.

Thanks!

thats what Terry suggested so i've already placed order