Ford Focus ST Forum banner
1 - 16 of 16 Posts

·
Registered
Joined
·
83 Posts
Discussion Starter · #1 ·
Hello, everyone! A few of you might remember my st and remember the boost issue I was having. I still haven't figured it out.. Lol

It has:
Cobb catted dp
Mbrp 3" exhaust
Cobb intake
Cobb intercooler
Sound symposer delete

I read on a post here that you can tell if you have a boost leak by logging the WGDC however I didn't see what to be looking for. What should I be looking for on that? What's healthy and what is an issue?

The issue I still have is boost peaking at 17psi then tampering down. It seems very consistent.
 

·
Registered
Joined
·
2,733 Posts
Log wgdc base and wgdc actual. When there's a large difference, there's likely a boost leak.
 
  • Like
Reactions: SIstomper

·
Registered
Joined
·
83 Posts
Discussion Starter · #7 ·
Thanks for the replies everyone! I'll do the data log today.

I am running a custom tune however the boost is the same in the ots Cobb tune also. I haven't tried stock yet though
 

·
Premium Member
Joined
·
13,959 Posts
Thanks for the replies everyone! I'll do the data log today.

I am running a custom tune however the boost is the same in the ots Cobb tune also. I haven't tried stock yet though
Verify that it's not in an eco mode slot. Alot of tunes will default to this slot and you need to change it once the tune is loaded.

Sent from another garage.
 

·
Registered
Joined
·
83 Posts
Discussion Starter · #11 ·
A new issue I'm having is the car is
Spuddering? I guess is the best way to describe it in first or second at around 1.5k. Not sure if the cold has anything to do with it
 

·
Registered
Joined
·
1,072 Posts
Hello, everyone! A few of you might remember my st and remember the boost issue I was having. I still haven't figured it out.. Lol

It has:
Cobb catted dpi
Mbrp 3" exhaust
Cobb intake
Cobb intercooler
Sound symposer delete

I read on a post here that you can tell if you have a boost leak by logging the WGDC however I didn't see what to be looking for. What should I be looking for on that? What's healthy and what is an issue?

The issue I still have is boost peaking at 17psi then tampering down. It seems very consistent.
Not sure if this has been brought up yet but I'm pretty sure if you're not tuned, you car will always make enough boost to hit a torque target
With colder air you get gmbetter power, so you car does not need to make as much boost to hits its torque target
Does that make sense?
I had a similar question last year because during the winter I noticed my boost wouldn't go above 15-18 psi
 

·
Super Moderator
2017 Ford Fusion Sport
Joined
·
8,200 Posts
Not sure if this has been brought up yet but I'm pretty sure if you're not tuned, you car will always make enough boost to hit a torque target
With colder air you get gmbetter power, so you car does not need to make as much boost to hits its torque target
Does that make sense?
I had a similar question last year because during the winter I noticed my boost wouldn't go above 15-18 psi
I would imagine you'd have to be more than stage 1 to reach the kind of power that it would cut you off 3-6 psi of boost. That's pretty dang severe. Take into account that cold weather lowers it a PSI or two that's still a heck of a drop.

Still a possibility at this point.
 

·
Registered
Joined
·
1,072 Posts
I would imagine you'd have to be more than stage 1 to reach the kind of power that it would cut you off 3-6 psi of boost. That's pretty dang severe. Take into account that cold weather lowers it a PSI or two that's still a heck of a drop.

Still a possibility at this point.
Im not tuned and I dont have a boost leak and I still could ony get like 18 psi in the winter, i live in the artic though, so it may be a little different
 

·
Super Moderator
2017 Ford Fusion Sport
Joined
·
8,200 Posts
Im not tuned and I dont have a boost leak and I still could ony get like 18 psi in the winter, i live in the artic though, so it may be a little different
Yeah I guess I didn't consider HOW cold...coldest we've seen that I've noticed so far is 8 degrees Fahrenheit. When it's that cold it's always in the morning on the way to work and I'm not in much of a hurry to get there hahaha.
 

·
Registered
Joined
·
7,330 Posts
Not sure if this has been brought up yet but I'm pretty sure if you're not tuned, you car will always make enough boost to hit a torque target
With colder air you get gmbetter power, so you car does not need to make as much boost to hits its torque target
Does that make sense?
I had a similar question last year because during the winter I noticed my boost wouldn't go above 15-18 psi
Most custom tunes use boost targets, and not torque targets like the OEM tune. This provides less consistent power, but the potential for more overall power based on ambient conditions.

OP, check your sound symposer delete. The only spot a boost leak is going to cause the car to sputter is if it's after the TB. Check all vacuum lines as well, especially PCV.
 
1 - 16 of 16 Posts
Top