[e92_boost]

Well just installed my VRSF Downpipes and HOLY LAG, has anyone experienced this? I did 1 & 7 on JB4 to have it adapt and still laggy. Can anyone chime in on this? The rattle got louder but I was expecting that thinking of upgrading to RB soon to get away from the annoying noise.

[SM335i]

No lag whatsoever when I installed mines.. Actually felt the opposite, like the turbos breathe better

[e92_boost]

I wonder if it's just me or what im having my cousin e92ben check it out and see what he says.

[e92_boost]

Found the issue I had it on map 4 switched to map 5 full throttle and sometimes jumps to map 4 again

[///Mposter]

You might have swapped the O2 sensors from bank 1 to bank 2 . Did you mark the pre-c a t ones ? Did you also mark the rear ones too? The rear connectors can easily be swapped. Also double check that you didn't install the v-band clamp in front of the wastegate arm.

[///Mposter]

The rear turbo vband location out of the way of the wastegate arm .

[e92_boost]

Originally Posted by ///Mposter

You might have swapped the O2 sensors from bank 1 to bank 2 . Did you mark the pre-c a t ones ? Did you also mark the rear ones too? The rear connectors can easily be swapped. Also double check that you didn't install the v-band clamp in front of the wastegate arm.

So you think the rear ones are opposite now?

[e92_boost]

Originally Posted by ///Mposter

The rear turbo vband location out of the way of the wastegate arm .

What do you mean by this picture im confused still learning.

[e92_boost]

Can you see it their? That was when the screw wasn't on the clamp

[924er]

You did something wrong. I felt way faster spooling and more power. Hands down best mod aside from Cobb. No wastegate rattle except on cold start but goes away after one minute

[e92_boost]

Originally Posted by 924er

You did something wrong. I felt way faster spooling and more power. Hands down best mod aside from Cobb. No wastegate rattle except on cold start but goes away after one minute

Power is crazy and no lag before when I tried it it was on map 4 and when I'm on map 5 sometimes it kicks me off to map 4

[924er]

Originally Posted by e92_boost

Power is crazy and no lag before when I tried it it was on map 4 and when I'm on map 5 sometimes it kicks me off to map 4

Yeah I wouldn't know why cuz I don't have jb4

[FoShizzle]

I had this happen to me a few times when I first put on my downpipes. It went away when I upgraded the jb4 firmware from 27x to 28.5b. Try putting some better fuel also.
Edit: just saw on n54tech that there were a few known bugs in the 27.x firmware that were fixed in 28.

[Flex68]

How do you update the firmware ???

[FoShizzle]

http://www.n54tech.com/forums/showthread.php?t=10605

[e92_boost]

So you think it could be the firmware?

[xrt_si]

Originally Posted by 924er

You did something wrong. I felt way faster spooling and more power. Hands down best mod aside from Cobb. No wastegate rattle except on cold start but goes away after one minute

I had exactly the same experience. Throttle response improved dramatically.

[Brule]

The known JB4 bugs are always very minor and very specific types of applications being improved.

I don't think firmware would change whats happening here but I would strongly recommend loading the updated firmware.

Throttle response will be determined by the settings of the menu 10 and 12 rather than firmware updates.

[e92_boost]

It hasn't done it anymore I haven't updated the firmware either