Just installed the older 3.5 inch Buschur Deluxe intercooler kit on a car for a friend and not his boost has dropped about 6 psi on the gauge. Car is tuned and ran awesome before the install and now hits fuel cut not long after making full boost. Now I expected the number on the gauge to drop but I had no idea it would be so drastic. As for the fuel cut, that is telling me that the load the ecu is seeing now is much greater now then before. Anyone else notice such a drop on the boost gauge after ic install? We did check for boost leaks to verify it was not some nasty boost leak.

 

what was the old intercooler?
might be worth it to get the car checked out on the dyno, if it's changed that much it might be running lean etc

 

I know with the ETS kit I was running lean-rich-lean-rich and fuel cut along with several counts of knock up top after installing the FMIC due to the enlarged core and pipeing.

 

does anyone know why i would go from 23psi to 14 psi with the ic swap?

i was running stock ic and now have the br 3.5 deluxe...

 

Check installation for leak?

 

Loose/torn coupler.

 

check the vaccum lines to the boost controller and make sure everything is installed correctly. what source did you use now being the br kit eliminates the nipple on the lower ic? i had this same intercooler way back and never had this issue.

 

tapped into the boost line for the factory boost gauge? plus the boost lines are different sizes, does that matter?

 

boost leak test. Do it now!

 

Sell your Evo before it is too late and buy yourself a Prius instead.

 

How about you just hang out in MesoAmerica as stay out of the thread if you have nothing to say in regards to the issue at hand. It should be noted the car was running 1.5 on the stock MR gauge with is about 21.75 psi and is now running 1.0 which is 14.5 psi. The old intercooler was the stock one and we have went over the couplers again just to double check for leaks. We do not have access to a boost leak tester at the moment, but that may be the project for next week. I started this thread just to see what others have experienced after a big intercooler install. I expected the boost to drop, the fuel cut is somewhat of a surprise, but it is flowing more now, no doubt. The other x factor is moving the boost feed line for the boost controller to the same source as the gauge. That may have been a mistake looking back, but it made for a super clean install. Anyone have any useful information? We are working on it some more tonight. Going to hook the laptop up to it and see what is going on.

 

Fuel cut is a classic sign of a boost leak.

I saw no difference in boost when I installed my deluxe intercooler, although I was using an EBC.

 

did you use the same original actuator hose? doesn't the evo have a restrictor in the hose to bring up the pressure?
so if you've run your own hose, that restrictor in it.
I'd recommend going back to how it was stock, but with the new intercooler. Start there. Then you can see exactly what the boost difference is.

Also if it's cutting out at ~15psi, maybe the feed line to the boost gauge is kinked or bent/leaking showing you a lower boost pressure than your engine is actually running. Or better yet you used the line with the restrictor in it for the boost gauge too?

 

all fixed... thanks

 

what was the problem?