[rader1]

Originally Posted by utfenix335i

I can feel it. it's like it's throttling then drops then goes up again... kinda like a rocking but gentle. Goes away when I put it on cruise control (sometimes). Wasn't a problem with my procede Rev2.5 module.

I've never had this issue but if you could provide some logs showing this happen maybe someone can help you out.

[themyst]

Originally Posted by adidasoccer

First time monitoring boost since i installed v400 today and my boost with a cold engine reads -0.1 psi where before during a cold start it would read anywhere from -11.2 -> -10.2... has the software changed or is something wrong im picking up no codes and im not feeling any lack of power

It's fine. Cobb redid how they read boost off the TMAP so it is accurate in the higher RPMs

[skim7x]

I just think that if you're serious about your car, it's always a good idea to get a good, simple boost gauge...

[rader1]

Originally Posted by skim7x

I just think that if you're serious about your car, it's always a good idea to get a good, simple boost gauge...

That's definitely not bad advice, but the AP doesn't have the reputation of being misleading(lying) about AFRs like some other tune does. I just wish there was a clean, factory like gauge for the 1s(I'm not a fan of the P3.)

[Malaka1]

When will Cobb be releasing a WG rattle fix??

[2Times]

Originally Posted by Malaka1

When will Cobb be releasing a WG rattle fix??

What WG rattle? lol

v400 is actually better for me than v301 (^that was taken this morning... I'm on v400 now)

[crypticc]

Originally Posted by Dickson

Hey guys I'm running Cobb stg 1 aggressive 4.0 and I feel like I have a substantial amount of turbo lag. My only other mod is Injen DCI. For example, if I am cruising at 50 mph in 3rd gear and I put the pedal to the floor, it takes at least 1-2 seconds before I feel the rush of the turbos kicking in (I do hear them spooling almost immediately though). But, the lag is certainly noticeable. This is not something new with 4.0 as it has been happening for as long as I can remember. I am not throwing any codes last time I checked on the Cobb. Until I did some reading, I thought this much lag was normal.

After reading some threads, many people say the n54 has very little noticeable turbo lag and that any lag may be attributed to a software update to fix wastegate rattle issues. Could that be my problem here, or does the Cobb flash overwrite these possible issues with the car's computer?

Any guidance is appreciated. If I should log a run, advice on what parameters to log would also be helpful. Thanks.

Don't confuse continuing to build boost beyond stock because it isn't capped, with lag.which is the actual delay from throttle to turbo response.

Try at higher revs and then see

[Malaka1]

Originally Posted by 2Times

What WG rattle? lol

v400 is actually better for me than v301 (^that was taken this morning... I'm on v400 now)

Ya I couldn't take the rattle it ruins the sound of the car, mine is worse than that and it is embarassing. Thus the reason I promptly switched back to JB4 and am waiting for a WG rattle fix.

[utfenix335i]

Originally Posted by rader1

I've never had this issue but if you could provide some logs showing this happen maybe someone can help you out.

I'll take a log tomorrow on my way to work and post it up tomorrow night. Thanks for the input!

[rader1]

Here's one of a couple logs i got tonight of stage 2+ SPORT. All the logs looked really good and i'm really happy with how sport is running(i am running 93 though.) Timing on cyl 1&2 are identical and really smooth


I'll give aggressive a couple runs tomorrow.

[2Times]

Originally Posted by rader1

Here's one of a couple logs i got tonight of stage 2+ SPORT. All the logs looked really good and i'm really happy with how sport is running(i am running 93 though.) Timing on cyl 1&2 are identical and really smooth

looks good... have you been to the track yet?

edit: 80% throttle?

[BMWsky]

Originally Posted by 2Times

looks good... have you been to the track yet?

+1, nice looking logs!

[rader1]

Originally Posted by 2Times

looks good... have you been to the track yet?

edit: 80% throttle?

I live 2 1/2 hours from the nearest 1/4 and my work schedule is horrible right now so I haven't been able to get to a track yet, hopefully soon.


Every log I've ever had 80% throttle is WOT.

[Dr_Dirt]

Originally Posted by rader1

Every log I've ever had 80% throttle is WOT.

I notice the same thing in my logs...

[2Times]

weird, mine is 99.61%

[enrita]

Originally Posted by Dr_Dirt

I notice the same thing in my logs...

its normal. thats how it should be.

[rader1]

Originally Posted by 2Times

weird, mine is 99.61%

Is that requested or actual TPS?


Every car I've hooked a scan tool to ~80%=WOT. This car and my APR stage 2 VW logged 80% as WOT.

[2Times]

Originally Posted by rader1

Is that requested or actual TPS?


Every car I've hooked a scan tool to ~80%=WOT. This car and my APR stage 2 VW logged 80% as WOT.

looks like you're right! (taken from one of my logs \/)

Accel Ped. Pos. (%)	TPS Act. (%)
96.9	                       78.63
99.61	                       80.16
99.61	                       81.08
99.61	                       81.08

[rader1]

i went and did a couple V400 stage 2+ AGGRESSIVE log, everything looks ok IMO but for some reason SPORT FEELS better than aggressive. It feels more responsive

[paapaa]

my thoughts with v400 with Steptronic:

-with LT i think i have easier worse fuel consumption than with ST map?
-does automatic transmission accelerate faster 1/4 or 1 mile with ST or with
LT map?
-seems (not sure) that with LT it keeps a little quieter exhaust sound than with ST (golf tee mod+sport exhaust+cattless system)?if so...its good.
maybe because the revs are in different range when using ST?

what do you think,expecially if you have AT?

[marv85]

Originally Posted by rader1

i went and did a couple V400 stage 2+ AGGRESSIVE log, everything looks ok IMO but for some reason SPORT better than aggressive. It feels more responsive

hey rader, does Sport feel more powerful or just more responsive? did you do a few pulls to let the ecu adapt?

why not run the data through virtual dyno and see the numbers?

[marv85]

^ also It would be a good idea to compare boost in the midrange. I wish I could run aggressive maps. 92 is highest octane we get...