I recently installed my Buschur FMIC. Quality is excellent, fitment was close enough...I had to bend one of the side brackets a little but it wasn't bad....but now that it's on something strange happened. Not my boost only hits 17.7psi when before it hit 21.9psi with the same duty cycle. Why did it drop so much? Tym said I probably lean it out some because of better airflow now which I'm sure is correct b/c I almost stall when stopping in neutral. But how much can that effect boost? Will that account for all my lost psi's Can anybody explain?

One a brighter note, it sounds ****in wicked

 

I have read in other posts that people have had minor boost leaks in the plumbing related to the intercooler. Have you checked/tightened all of the related hoses?

 

Any time when putting a bigger more efficent Intercooler on a car you will get some pressure drop. You are filling a larger space with the same setting on the boost controller will yeald a lower boost pressure. Just tune the boost controller up a little and you will be on your way.

 

I checked for boost leaks after i installed the fmic and there were none.

I tried turning the boost up and it hit 19.9 psi but I hit fuel cut. I guess that just means I need to adjust setting on my emanage?

 

Same here! I'm running the Vishnu Xede stg v360 and am only hitting around 20 psi

 

Guys,

boost will always drop with a more efficient intercooler. It means it is working. Pressure is actually a resistance to flow. The intercooler cools the charge and therefore, it takes less volume. You are getting the same MASS of air, but it is cooler and takes less space. More of the air is getting into the cylinders instead of expanding. It is thermodynamics at work.

HiVoltEVO8

 

Yeah but hot air will always flow better than cold air, Less dense. Hot air builds its own pressure "expansion"within a contained enviroment pushing itself out the nearest opening. Just think of an exhaust system, The hotter the gas the faster the flow. The only thing that makes a more efficent intercooler is having the right turbo. Finding the happy medium right turbo right intercooler is priceless.

 

The difference is an exhaust you want it to stay hot (Like you said) to help it escape out. The intake you want the opposite. You want the best flow and the coolest air. It may technically flow slightly better when warm but it is less dense and obviously much warmer so the mass is much lower. You want the most mass to enter the engine at the coolest temp at the highest velocity. The best IC would be one that can cool the temps back down to ambient or cooler (Like a water to air), flow enough where it has the least amount of restriction possible. You would never want an IC that doesnt cool as much.

 

I know all of that, I was just making a point about hot and cold. But choosing the wrong intercooler for a turbo, can end up killing your turbo. Just like with the stock turbo, I would not upgrade the intercooler with a larger one. The boost lowers because it is trying to fill a larger area "intercooler", not because it is flowing better. The boost will fall with an intercooler upgrade, depending what kind of turbo you have. When you try to raise the boost back to stock or higher the turbo is actually working harder to keep up with the larger intercooler. Thus increasing the compressor speed heating the air alot more. HAVING THE RIGHT INTERCOOLER FOR THE RIGHT TURBO, PRICELESS.

 

you make it sound like a larger, more efficient intercooler is a bad thing.... One thing in your description you left out is the fact that denser air makes MORE power. The turbo may actually be working harder, I agree, but it's because the turbo is supplying the air to make MORE power! Not because of the volume of the intercooler, but because the charge air going into the cylinders is cooler and more dense, making MORE power.

A larger more efficient intercooler will not "kill" your turbo. It will make your turbo work harder to supply the same boost pressure, no doubt. But that same boost pressure will make MORE power. A larger more efficient intercooler may give you a couple hundred rpm lag, but it will only RAISE power.

Trinababe is correct.

 

A larger intercooler is a good thing, I agree. But you are not understanding what I am saying. Without the correct turbo a larger intercooler can actually rob you of power. Sure it can cool the air more effectively, but if the turbo cant keep up you will never make the correct boost needed to make power. Turbos have a range that they work best in, if you push it beyond that its just not going to give you the desired results. Because if the turbo is trying to fill a larger volume of space, it will also be combating the natural aspiration of the engine. There for the turbo will be working out of its effective range. Like I said before, You have to have the right turbo and the right intercooler combined.

 

I have perhaps one of the largest intercoolers for the Evo and it affected me on spool up more than anything else.

If you read my post for the last few months I never complained about losing boost, I was able to recup my boost easily by cranking up the boost on my MBC but again my spool up has been compromised.

The good thing about my intercooler is that I can maintain rock solid boost all the time and I am able to maintain 21-22psi above 7000rpm.

Overall, this intercooler helped me to achieve my goals of being able to run high boost safely by dropping the temp of the intake manifold significantly.

Carlos