how to get rid of boost cut

[AutoXRacer]

For cdfp I would suggest you go mrlilguy. I heard nothing but good reviews.

Turbo inlet pipe should be ok depending on which sir/cai you go.

I suggest getting one w/ air straightener such as cobb/cpe/new aem.

Otherwise this may throw off your maf and cause problems.

-C

You know you can get an airflow straightener from AEM for the MS CAI...
I did and it settle my fuel trims nicely!!

 

[acidbug]

You know you can get an airflow straightener from AEM for the MS CAI...
I did and it settle my fuel trims nicely!!

This MAF setup is very advance. I have worked on turbo'd mazdas for like 6 years. I can tell you that a good percentage of these boost cut issues could be solved with this airflow straighener.

-C

 

[jamesk]

what is that exactly? any pictures or links of it?

 

[ericrapp]

You know you can get an airflow straightener from AEM for the MS CAI...
I did and it settle my fuel trims nicely!!

Why didn't you call me!

 

[ericrapp]

This MAF setup is very advance. I have worked on turbo'd mazdas for like 6 years. I can tell you that a good percentage of these boost cut issues could be solved with this airflow straighener.

-C

AB, you could have helped me out. You know of my suffering I am a newbie. Do you think there is hope for me and the boost cut/Mscai thing.

 

[AutoXRacer]

Haven't you guys been paying attention...? (lol2)

http://www.mazdas247.com/forum/showthread.php?t=123716397&page=3

I bought one hoping it would get rid of my boost cut...it didn't, but it did fix my fuel trims nicely!! And smoothed out my MAF readings at high RPMs.

 

[acidbug]

what is that exactly? any pictures or links of it?

It's a sensor. that meters/measures the air that's making it's way into the engine. It sense all kinds of stuff such as how dense, temps, volume, velocity, etc.

Here's a pic of one.

 

[ericrapp]

X wow, I read and thank you. you now have my attention. interested also about cleaning up the high end. still pulling?

 

[lewisb01]

Haven't you guys been paying attention...? (lol2)

http://www.mazdas247.com/forum/showthread.php?t=123716397&page=3

I bought one hoping it would get rid of my boost cut...it didn't, but it did fix my fuel trims nicely!! And smoothed out my MAF readings at high RPMs.

Does this AFS work with all CAI units?
I was going to order the Injen one but I dont want any issues with fuel trim etc...
if it doesn't work with the injen what CAI models have this AFS besides AEM and CP-E

 

[AutoXRacer]

The only ones I know of are AEM, CP-E, and Cobb (SRI)...and now the Mazdaspeed if you can find one and order the AFS separately.

 

[acidbug]

AB, you could have helped me out. You know of my suffering I am a newbie. Do you think there is hope for me and the boost cut/Mscai thing.

Boost cut can be caused by many different things. Such as volume/temps/etc. of air (maf), boost pressure (as measure by the map), fuel pressure...etc...The ecu is looking for certain parameters...and if they are not met..you get fuel cut.

The issue is figuring out what will help reduce/eliminate.

You should def get the air straightener as i believe this will assist in reducing fuel trims (which can cause fuel cuts/CEL's).

Or take it back to square one and figure out which mods are causing your fuel cut. I personally think it's the exhaust mods. This turbo spools uncontrollably with open intake and exhaust.

Haven't you guys been paying attention...? (lol2)

http://www.mazdas247.com/forum/showthread.php?t=123716397&page=3

I bought one hoping it would get rid of my boost cut...it didn't, but it did fix my fuel trims nicely!! And smoothed out my MAF readings at high RPMs.

There are many different boost cuts.

 

[AutoXRacer]

There are many different boost cuts.

I personally disagree with this statement.

Boost cut is cause by overboosting, whether it is due to holding boost at higher RPMs (what I had) or just plain old higher base boost (17-18 PSI, etc). The trigger is the MAP sensor.

In the MS3, the MAP sensor is the only one responsible for boost cut.

Now, regarding fuel cut, you can blame that one on the MAF in addition to AFRs and fuel pressures.. What triggers this with the MAF are cold temps and airflow.

Once the MAP is clamped, you will not see boost cut since that is the sensor used to monitor boost levels.

What exactly do you mean by there are many types of boost cuts? (huh)

 

[ericrapp]

AB I definitely have the too much boost issue caused by the open exhaust as you mentioned, which causes a run over by turbine, I assume. My fuel by wide band is ok now though.

 

[AutoXRacer]

AB I definitely have the too much boost issue caused by the open exhaust as you mentioned, which causes a run over by turbine, I assume. My fuel by wide band is ok now though.

Aren't you montioring your AFRs and fuel pressures...?

 

[acidbug]

I personally disagree with this statement.

Boost cut is cause by overboosting, whether it is due to holding boost at higher RPMs (what I had) or just plain old higher base boost (17-18 PSI, etc). The trigger is the MAP sensor.

In the MS3, the MAP sensor is the only one responsible for boost cut.

Now, regarding fuel cut, you can blame that one on the MAF in addition to AFRs and fuel pressures.. What triggers this with the MAF are cold temps and airflow.

Once the MAP is clamped, you will not see boost cut since that is the sensor used to monitor boost levels.

What exactly do you mean by there are many types of boost cuts? (huh)

People throw around many different names for it but it's the same issue.

The car cuts power.

Whether it's boost related, fuel related, spark related, weather related...plain and simple the car cuts power if any of it's parameters are exceeded.

I was trying to say there are many different variables that can cause boost/fuel/whatever you want to call it cut.

my .02

-C

 

[ericrapp]

Aren't you montioring your AFRs and fuel pressures...?

i have not monitored fuel pressure. Fuel supply absolutely was a problem that mazda corrected. i do not misfire or throw any cels anymore which I did alot after the IC and exhaust upgrade. The wide band was temporarily used to be sure the car was safe before and after the fuel pump.

 

[borderline]

Interesting POST
Someone know what are the correct values I SHOULD see into the STFT and LTFT with my DH?

 

[AutoXRacer]

Interesting POST
Someone know what are the correct values I SHOULD see into the STFT and LTFT with my DH?

Stock trims should be as close to 0.0 as possible...except if you use your A/C a lot. Its throws it off a little.

STFT~ -1.X to 0.0
LTFT~ -1.X to 0.0

There are just approximate... Everyones will vary depending on mods and such.

 

[ericrapp]

Autox, could you explain to me what fuel trim is? Feel free to pm if it is appropriate for thread. just trying to learn abit more. Does the DH do a calculation or is it a live read?

 

[AutoXRacer]

Autox, could you explain to me what fuel trim is? Feel free to pm if it is appropriate for thread. just trying to learn abit more. Does the DH do a calculation or is it a live read?

I'm not 100% knowledgeable on fuel trims either... All I know is that fuel trims basically tell you how much the ECU has to adjust...at least thats how it was explained to me. The higher the number, the more the ECU is adjusting stuff. Which is not good.

The DH reading is real time...its not a calculation...