Less boost after mounting Cobb intercooler

[Michele_Italy]

Dear all,
I am a new member of your great forum, I am from Italy, so sorry for my English.

This week I mounted Cobb intercooler, before I had 20 psi, now I have 18 psi.

Do you think I could have a leak? or less pressure could be caused by the bigger volume of the IC?



Thank you.
Have a nice day

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[PRG3k]

Possibly both. Check your charge clamps as well as the sensor on the intercooler. Pressure drop shouldn't really be an issue on the smaller units

 

[Michele_Italy]

Thank you.
now I have a third option,
with improved IC air temperature is lower, so it menas that inside the IC now the air decreases much more his volume, decreasing volume it also looses pressure, so it is possible that MAP sensor read lower boost?

Concening your Ecoboost, I read Adam Tune+, did yu change wastegate and BOV too?

 

[TEXAS HEAT]

Dear all,
I am a new member of your great forum, I am from Italy, so sorry for my English.

This week I mounted Cobb intercooler, before I had 20 psi, now I have 18 psi.

Do you think I could have a leak? or less pressure could be caused by the bigger volume of the IC?



Thank you.
Have a nice day

The Cobb unit looks very similar in design to the Mishimoto so I would say its possibly to experience a 1 to 2 psi pressure drop across the core versus stock, however I agree that you should check for boost leaks as well. I cannot say for sure because I'm not familiar with the tuning strategy on the EBM, but if it is a load based tune, you could be hitting your load targets at a lower boost level which would be an indication of improved efficiency and less pressure drop across the core. Perhaps Adam @Tune+ can chime in and set this straight.

 

[Soulripper]

are you tuned? or using the ots?

 

[Tune+]

Pressure drop in the system, pretty standard. Just need a tune to make some changes.

 

[Glenn G]

Restriction =higher boost. That and boyle's law tells us that the same mass of a gas at lower temperature will occupy less volume. Your car is running better now and safer but the stock tune will not be able to take full advantage of the cooler charge temps.

 

[TEXAS HEAT]

Restriction =higher boost. That and boyle's law tells us that the same mass of a gas at lower temperature will occupy less volume. Your car is running better now and safer but the stock tune will not be able to take full advantage of the cooler charge temps.

Yes, higher boost at the turbo outlet, not at the intake manifold.

 

[Glenn G]

Yes, higher boost at the turbo outlet, not at the intake manifold.

Especially at the Intake manifold!

I didn't feel like doing mass temperature formulas so I'm just pulling numbers in line with what I have seen on my car.

lets say your turbo is putting out 21 psi at the outlet at 90 degrees, you go through the inter cooler that reduces it to 80 degrees at 20psi, That (or lower)is what you see at your manifold,

You upgrade the IC, the turbo is making the same exact 21 psi@90 degrees at the outlet but the charge temps are down to 70 degrees, that same exact MASS of air will now only make 18 psi at the manifold but the cooler denser charge will let the computer add some timing within it's set limits.

The wastegate on these cars gets it's pressure from the hot side, meaning it will not compensate for the pressure drop due to temperature (It will to a lesser degree compensate for better flow.)

With a tune a good tuner like Adam can push 24 psi @ 100 degrees through the turbo, it hits the upgraded IC and will be 80ish Degc and 20 psi at the manifold. So while you are running the same boost at the manifold, the mass of air is significantly higher and the cooler charge means the tuner can add more timing safely than the stock map would allow and make way more power at the same boost level as referenced from the intake manifold,

 

[TEXAS HEAT]

Especially at the Intake manifold!

I didn't feel like doing mass temperature formulas so I'm just pulling numbers in line with what I have seen on my car.

lets say your turbo is putting out 21 psi at the outlet at 90 degrees, you go through the inter cooler that reduces it to 80 degrees at 20psi, That (or lower)is what you see at your manifold,

You upgrade the IC, the turbo is making the same exact 21 psi@90 degrees at the outlet but the charge temps are down to 70 degrees, that same exact MASS of air will now only make 18 psi at the manifold but the cooler denser charge will let the computer add some timing within it's set limits.

The wastegate on these cars gets it's pressure from the hot side, meaning it will not compensate for the pressure drop due to temperature (It will to a lesser degree compensate for better flow.)

With a tune a good tuner like Adam can push 24 psi @ 100 degrees through the turbo, it hits the upgraded IC and will be 80ish Degc and 20 psi at the manifold. So while you are running the same boost at the manifold, the mass of air is significantly higher and the cooler charge means the tuner can add more timing safely than the stock map would allow and make way more power at the same boost level as referenced from the intake manifold,

I see we are both German I agree with you completely in regards to air mass and pressure. The pressure drop still occurs even if there is more mass because of lower temps. I think the point I was trying to make is that without tuning to compensate for the pressure drop the result would be less pressure at the intake manifold. Not less power. More power, more dense air-charge only with less pressure. This is assuming no boost leaks and if the tuning logic does load calculations and it is hitting the set load targets with less pressure. :cheers:

 

[Michele_Italy]

Dear all, thank you for your answers.
My EB mounts all the parts of Cobb stage 2 (Cai, IC, Accessport) and Magnaflow competion cat back.
I tried also Cobb tune (1 and 2) but I am not fully satisfied, so Adam will have a new customer soon.

However do you suggest me to change wastegate and bov?
Or with stock turbine it's just a waste of money?

With accessport is it possible to read boost pressure just after the turbo?

 

[Busser48]

Dear all, thank you for your answers.
My EB mounts all the parts of Cobb stage 2 (Cai, IC, Accessport) and Magnaflow competion cat back.
I tried also Cobb tune (1 and 2) but I am not fully satisfied, so Adam will have a new customer soon.

However do you suggest me to change wastegate and bov?
Or with stock turbine it's just a waste of money?

With accessport is it possible to read boost pressure just after the turbo?

Yes you should change the wastegate, BOV only if you want to hear whoosh sound. No performance value.

 

[Michele_Italy]

I have just sent an email to Adam :-)

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