Need help with stage 2 tune.

[SubiEj255]

I just installed my downpipe today, sounds nice btw, but I pulled a log. Upon pulling the log, I noticed that the car studders, I know this isn't normal. It just feels like something isn't right. So when I get home I opened the log and this is what I said.....

https://docs.google.com/spreadsheet/...Td4SzdIQUpUdXc

This appears be to some crap, unless I am wrong. How do I fix this if its wrong? I tuned with the Cobb AP with an invidia DP.

[Rambo]

Looks you're getting some boost creep. Is that a catless downpipe? You should see peak boost of 17psi around 3500 rpm, then tapering down to 13 or so (going off Cobb's map notes).

[SubiEj255]

Yes it is catless. Targeted boost per their map notes is 18.5 down to 13 or 14; it also says +/- 1 psi, so I am in acceptable boost levels. I was referring to the "DAM" & "fine knock learning"

[MainFrame]

You're overshooting your boost targets by 2.5 - 3.5psi.. that might be the cause of your knock.



I would try the LWG map and see what happens.

[SubiEj255]

How so much? It says 18 on the notes. My peak was about 19/20

[MainFrame]

Probably because the map was designed for catted downpipes only.



Look at the boost error. Where you're hitting 19.61psi at 4999rpm, your tune is targeting 16.3psi. Doesn't look so much like creep, just over boosting.. so hopefully the LWG map will do you right.

[SubiEj255]

I will try that map along with another. I know the map is designed for catted DPs, but I thought thee only problem would be boost creep from the added pressure, not knock as well.

Could it be the gas?

[Ruh Roh]

the third gens with the catless down pipes are known to have boost creep issues.

[Donkey]

I will try that map along with another. I know the map is designed for catted DPs, but I thought thee only problem would be boost creep from the added pressure, not knock as well.

The overboosting/boost creep is causing the knock possibly. There is a reason the map notes are to be followed.

[Anub1s]

I fail to understand why people don't think it's important to follow map notes made by the makers of the tune, and on top of that, wonder why they have problems when they don't.

[SubiEj255]

I never said it wasn't important to follow the maps notes. I know and understand boost creep/ overboosting. However, this is all the map notes said about using a DP that's catless. My concern isn't the boost, it's the knock. To the gentleman that said try an LWG map; will do. I will also post that log here as well.

[EJ257]

Your DAM is at zero. You're pulling 5°. You should not be going WOT. Are you sure you tightened everything down properly? Rattles in the engine bay may trigger false knock readings.

I never said it wasn't important to follow the maps notes. I know and understand boost creep/ overboosting. However, this is all the map notes said about using a DP that's catless. My concern isn't the boost, it's the knock. To the gentleman that said try an LWG map; will do. I will also post that log here as well.

The overboosting/boost creep is causing the knock possibly. There is a reason the map notes are to be followed.

You don't fully understand boost creep and overboost, then. To elaborate a bit more on Rons post...

The extra boost can be putting you in untuned load sites, where the car is running too much timing for the boost your MAP sensor is registering. Therefore, causing the knock.

[SubiEj255]

Your DAM is at zero. You're pulling 5°. You should not be going WOT. Are you sure you tightened everything down properly? Rattles in the engine bay may trigger false knock readings.

I don't fully understand what you mean "I should not be going WOT" I am pretty sure everything is tighten correctly. I will double check. You mean from the turn to the DP or the whole assembly?

[MainFrame]

Your car is not healthy, driving it hard in this condition can cause permanent damage and possibly engine failure. Like ej was saying, both over boosting and boost creep will cause knock.

[SubiEj255]

I do know that. I put a different map on. It seems to be running better. I haven't seen the log yet.