Possible boost leak?

[04mazdaspeed]

Hey everyone. I'm currently getting custom tuned with twisted and have a few questions. The last log I sent him he responded that my wgdc is somewhat high compared to the boost I'm making. I have performed a few boost leak tests now and on my first one discovered that my tmap o ring was ripped. I replaced that oring and re-checked all my hose connections the best I could. My question is what else could possible be causing the high wgdc? I am including the latest 3rd and 4th gear logs in datazap so you guys can take a look at them for me. Also, I see that he is commanding a certain boost at a given rpm but I don't seem to be holding targets as the rpm rises. I know that I cant hold boost to redline but then why have a target of 17psi at 6k if I'm only hitting 11? Thanks in advance. I'm no expert but am trying to interpret logs and figured I would get some more advice on here.

My current mods that are on my 2011 135i dct 31K miles
BMS intake
VRSF chargepipe
VRSF catless dp
VRSF 7" intercooler
Berk race axle back
BMS catch can
new plugs gapped to .022
Fuel it stage 2 lpfp
currently tuning for 93oct

http://datazap.me/u/04mazdaspeed/93-...ta=4-14&mark=3

http://datazap.me/u/04mazdaspeed/93-...og=1&data=4-14

Added note, I am not getting any codes either so if it is leaking boost, it cant be a huge leak. Car seems to be pulling great.

[04mazdaspeed]

Also, tried to boost leak test again today. Are you guys able to pressurize the system to 20psi or no? I couldn't get more than 9-10 pounds of air I was hearing air leaking bad but sounds like its coming from the wastegate. Do I need to hold that shut to get more air into it or sound like this is a problem?

[ShocknAwe]

Honestly the boost looks ok to me. 20 psi tapering to 17 at redline is asking a lot of the engine on only 93 octane. What I do see is that you're pulling timing across several cylinders. I'd try adding a little octane and relogging to see if your timing smooths out. I suspect your boost curve will raise a little too, as your WGDC isn't quite maxed out. WGDC and PID are close to eachother as well.

I'm assuming you don't have inlets as well, correct? If not, it will be hard for your turbos to keep up after ~5000 rpm, which is where I see the boost curve drop off target the most.

[04mazdaspeed]

Originally Posted by ShocknAwe

Honestly the boost looks ok to me. 20 psi tapering to 17 at redline is asking a lot of the engine on only 93 octane. What I do see is that you're pulling timing across several cylinders. I'd try adding a little octane and relogging to see if your timing smooths out. I suspect your boost curve will raise a little too, as your WGDC isn't quite maxed out. WGDC and PID are close to eachother as well.

I'm assuming you don't have inlets as well, correct? If not, it will be hard for your turbos to keep up after ~5000 rpm, which is where I see the boost curve drop off target the most.

I'm still getting revisions done with Justin. They are just taking time since I believe he is super busy. We are just trying to find the sweet spot on 93 before we switch to e85. I don't have inlets since I'm n55. I'm just trying to understand what he is seeing since he is saying that wgdc is still high but I've done the boost leak test a few times now and can't find any other leaks. I'm almost tempted to have a shop do it with a uh dye to confirm their are no leaks. Car feels great otherwise.

[04mazdaspeed]

Why would he be commanding 17psi up top then if the factory turbo can't even come close? I see that I do hit very close to boost target right around 3-3500k and it drops from there. Am I looking at it correctly. He is commanding a certain boost and my targets aren't coming close the further it goes up the rpm range.

[ShocknAwe]

Twinscroll runs out of breath very fast. Admittedly I had missed that you were n55, but similar parameters apply. You could get an inlet pipe from pure. I'd try adding a gallon or two of e85 and relog. Will answer a few questions. E85 will reduce impact of iat on performance as well.

[04mazdaspeed]

I don't want to add any e mix yet since I want this tune to be strictly for 93. What will the inlet pipe do for me? I sent new logs to Justin and just waiting on a new revision from him.

[ShocknAwe]

Originally Posted by 04mazdaspeed

I don't want to add any e mix yet since I want this tune to be strictly for 93. What will the inlet pipe do for me? I sent new logs to Justin and just waiting on a new revision from him.

Removes front end restriction which gets more air to the turbo so it doesn't struggle to put out big boost as much.

[WhatsADSM]

All the tuners do this. They target really high load/boost levels that the car can never actually hit. Most of the reason is that they want to avoid any throttle closures due to little boost overshoots (such as after shift change).

I don't really agree much with this strategy but that's another story.

[04mazdaspeed]

Originally Posted by ShocknAwe

Removes front end restriction which gets more air to the turbo so it doesn't struggle to put out big boost as much.

I checked it out on pure's website. This is the same pipe that is directly above the passenger side intercooler pipe correct? If so, is it pretty easy to change do you know? Also what about their factory diverter valve upgrade. Any thoughts on that?

[04mazdaspeed]

Originally Posted by WhatsADSM

All the tuners do this. They target really high load/boost levels that the car can never actually hit. Most of the reason is that they want to avoid any throttle closures due to little boost overshoots (such as after shift change).

I don't really agree much with this strategy but that's another story.

Thanks, I was assuming there was a reason he was doing that but wasn't sure. I did know that I wasn't going to hit 17psi on factory turbo at 6k+ but was curious why he was commanding it then.

[04mazdaspeed]

I got a new revision from Justin. Here are the logs and could you guys tell me how they look. From what I think I'm seeing, wgdc is still high but its high in the rpm range where the turbo is probably struggling to keep boost. Still some timing corrections on both logs but on the 4th gear log, they don't look too bad.

http://datazap.me/u/04mazdaspeed/log...og=0&data=4-14
http://datazap.me/u/04mazdaspeed/log...og=1&data=4-14