[AllenM335is]

My 335is fluttures under load from 2k rpm to 4k also sometimes when you upshift you get no power what so ever and then it smacks itself into gear

Car is 335is DCT 82k miles with the following mods
DCI
Arm Chargepipe
Arm downpipes
G plus amazon intercooler
VTTO inlets
Secondary cat delete
Walbro 450 274 high preasure version
3.5 tmap sensor
Maintenance done so far:
Lpfp sensor replaced
Ngk 2 step colder plugs
all new silicone vacuum lines.
replaced diverter valves with another oem set
Brand new index twelve injectors coded

the car flutters only under load from the 2k to 4k rpm range

Here are some logs:
https://datazap.me/u/allenmessi/lean...og=0&data=3-22

[Moisture]

Originally Posted by AllenM335is

My 335is fluttures under load from 2k rpm to 4k also sometimes when you upshift you get no power what so ever and then it smacks itself into gear

Car is 335is DCT 82k miles with the following mods
DCI
Arm Chargepipe
Arm downpipes
G plus amazon intercooler
VTTO inlets
Secondary cat delete
Walbro 450 274 high preasure version
3.5 tmap sensor
Maintenance done so far:
Lpfp sensor replaced
Ngk 2 step colder plugs
all new silicone vacuum lines.
replaced diverter valves with another oem set
Brand new index twelve injectors coded

the car flutters only under load from the 2k to 4k rpm range

Here are some logs:
https://datazap.me/u/allenmessi/slean?log=1&data=3-20
https://datazap.me/u/allenmessi/lean...og=0&data=3-22

I'm not exactly sure what you mean by flutter. Like stuttering? on off power quickly? Sounds like an ignition coil or fuel pump/pressure related issue. How is your fuel system pressure?

If you are describing what I think you are, sort of like a misfire at high RPM, thats probably related to your ignition coil and spark plugs.

As for the hard shift into gear, thats related to transmission. I strongly advise you to find a transmission shop and speak to them. I was going to say that sounds like you need a valvebody rebuild and solenoid replacement, but then I remembered that the 335is is DCT.. So hopefully someone with more knowledge on this unit can chime in.

My only other useful suggestion would be to NOT drive the car hard, especially in a way that will replicate the fluttering you describe or hard shifts. That's the easiest way to start ruining expensive things. As long as you stay below 3000RPM until you get this issue sorted out you'll be fine.

[Moisture]

Do you have a tune btw? your fuel trims probably aren't gonna look too great if you're fully catless without a tune.

[AllenM335is]

Originally Posted by Moisture

Do you have a tune btw? your fuel trims probably aren't gonna look too great if you're fully catless without a tune.

Yeah the car is costume tuned, problem is not due to tune as the car still has the same issue on MHD tune as well. I do not believe the trans is the culprit the car looses power between shifts so when power comes back it gives you a kick and it rarely does it. But u can hear the intake sucking in air and letting off, check the log the waste gates are acting weird. i do not believe it's coils because i have no timing pulls what so ever. This car has brand new turbos with less than 20k miles on them. I'm not sure what is causing this issue but it's driving me insane, fuel pressure doesn't drop below 64psi on the lowside, car does not have any shadow codes or check engine light. So far ive tried replacing both vanos solenoids, spark plugs, fuel sensor, injectors, divert er valves, all vacuum lines to solve the problem to no success yet. Could it be a shit quality intercooler ? i mean there is alot of boost oscillation and not meeting boost or load target let alone maintaining. Please help with this situation it's getting over my head.

[TunafishE93]

So you said car upshifts, slips and than grabs gear and you think its not transmission? I would look at transmission, fluid level, temps, filter..

[AllenM335is]

Originally Posted by TunafishE93

So you said car upshifts, slips and than grabs gear and you think its not transmission? I would look at transmission, fluid level, temps, filter..

Okay the car doesn’t do that it only does it when the car is oscillating, wnd look at the WGDC on the log, it has more to do w the engine

[Sgop335]

Originally Posted by AllenM335is

Okay the car doesn’t do that it only does it when the car is oscillating, wnd look at the WGDC on the log, it has more to do w the engine

fyi, The wgdc in the log has wild swings, which is tune related. Possibly because of the d-factor.

[AllenM335is]

Originally Posted by Sgop335

fyi, The wgdc in the log has wild swings, which is tune related. Possibly because of the d-factor.

What’s the D factor? i also forgot that the car does have VTTO inlets. car does the same wgdc oscillating on mhd stage 2+

[Moisture]

So you're sure that your transmission is shifting totally normal? Didn't you mention a hard shift?

I think you need to start with the transmission first.

[AllenM335is]

Originally Posted by Moisture

So you're sure that your transmission is shifting totally normal? Didn't you mention a hard shift?

I think you need to start with the transmission first.

Trans is totally fine. i’m positive on that it’s engine related could a hole in the inlet cause this?

[Sgop335]

Originally Posted by AllenM335is

What’s the D factor? i also forgot that the car does have VTTO inlets. car does the same wgdc oscillating on mhd stage 2+

usually mhd maps don't oscillate. Do you have the log ?

D-factor is the wgdc correction based on the rate of boost increase/decrease.
Looks like there is a boost leak that may be causing all this

[AllenM335is]

Originally Posted by Sgop335

usually mhd maps don't oscillate. Do you have the log ?

D-factor is the wgdc correction based on the rate of boost increase/decrease.
Looks like there is a boost leak that may be causing all this

i replaced all vacume lines

[NoGuru]

Where are you in MI. I have an IS with DCT that is very modded. I can take a look at yours if you are near the Oakland Co, Troy area?

[AllenM335is]

Originally Posted by NoGuru

Where are you in MI. I have an IS with DCT that is very modded. I can take a look at yours if you are near the Oakland Co, Troy area?

I’m in macomb county on 23 mile very close by

[NoGuru]

Originally Posted by AllenM335is

I’m in macomb county on 23 mile very close by

Shoot me a PM and we can take a look at it.

[TunafishE93]

MHD tunes has issue too so you can't rule out the tune. https://www.e90post.com/forums/showt...18714&page=382

[NoGuru]

Originally Posted by AllenM335is

Yeah the car is costume tuned, problem is not due to tune as the car still has the same issue on MHD tune as well. I do not believe the trans is the culprit the car looses power between shifts so when power comes back it gives you a kick and it rarely does it. But u can hear the intake sucking in air and letting off, check the log the waste gates are acting weird. i do not believe it's coils because i have no timing pulls what so ever. This car has brand new turbos with less than 20k miles on them. I'm not sure what is causing this issue but it's driving me insane, fuel pressure doesn't drop below 64psi on the lowside, car does not have any shadow codes or check engine light. So far ive tried replacing both vanos solenoids, spark plugs, fuel sensor, injectors, divert er valves, all vacuum lines to solve the problem to no success yet. Could it be a shit quality intercooler ? i mean there is alot of boost oscillation and not meeting boost or load target let alone maintaining. Please help with this situation it's getting over my head.

Originally Posted by TunafishE93

MHD tunes has issue too so you can't rule out the tune. https://www.e90post.com/forums/showt...18714&page=382

He stated the tune is custom.

[TunafishE93]

Doesn't mean custom tune is good. And the "tune" that I was referring to that you can't rule is the custom tune. Based on the logic that MHD should work...

[AllenM335is]

Originally Posted by TunafishE93

Doesn't mean custom tune is good. And the "tune" that I was referring to that you can't rule is the custom tune. Based on the logic that MHD should work...

Does the same thing on MHD stage 2+ it’s worst on the e85 maps or anything that requires more boost