Hi guys I have just fitted a 3" front mount inter cooler into my car and am finding it is running rich and sometimes backfiring and suggesting do i need the ecu changed or tuned???
You probably have a boost leak, check all your connections. Also if the core is second hand you may have a leak in that if it was damaged. On my second hand SMIC's I had part of the bar and plate section separating which was leaking. Got it stuck back together by a truck radiator place.
the cooler is brand new ill check for the boost leak but i also got after market blow off valves on there to could that be effecting also??
Could probably adjust your BOV's so they only open past a preferred boost pressure? I'm getting mine shortly and will try to adjust them to only open above maybe 4-6 psi but depends yet. Good luck.
Bov's should not open whatsoever until you let throttle close. They are not a boost controller. closed tight while boosting. And open when foot off gas. People seem to have a misconception on bov's, maybe try a search on how they work. Cheers Darren
Don't think that's what he meant. He said opens past 6 psi, so I read that as only vent when you boost over 6psi then release the throttle.
Regardless of pressure they should open at closed throttle. Even if your car only hits 3psi when you release throttle they still need to vent that pressure to be serving their purpose. If they don't vent anything under 6psi. Whats the point having them because half the time the won't be doing anything
Im quite happy with my bov's releasing any pressure my car makes on boost, may that be 3psi or 15psi. Any positive pressure gets released when I take my foot of the throttle and to me that's how a bov works. If people want 6 psi going back through their pipes working against the turbo, that's fine for them. My car is running just fine as it is.
Hmm, kind of. It's the differential pressure across the valve that makes it open, rather than the boost in itself.
Blow off valves are air pressure release valves that can be mounted on the intake piping of a turbocharged car anywhere in between the turbo and the throttle body. The functions of a blow off valve Without a blow off valve, when you let off of the gas, the compressed air in your intake piping increases to great pressures as the turbines in the turbocharger are forced to a screeching hault. The extreme pressure forces the air back through the turbocharger, increasing the wear on the turbo. With a blow off valve, when you let off of the gas the air pressure left in your intake piping is relieved as the blow off valve opens up. This allows your turbo to continue spinning in the proper direction, preventing damage to the turbo and allowing for a faster return to positive air pressure in the intake piping. How it works A small diameter hose runs from the intake manifold to the blow off valve. When the pressure in the intake manifold is positive (in boost), the pressure in the small hose keeps the wastegate closed. Once you let off of the gas, the throttle plate closes, and all of the air in the intake manifold is sucked into the engine. With negative, or zero pressure in the intake manifold, the blow off valve opens up and releases all of the compressed air from the intake piping.
I know full well how they work, turbocompressor and pump engineer remember There is a spring on the main piston within the valve. This spring stops the valve from opening at idle which would stuff everything up if using a atmo BOV on a AFM'd car. You need enough boost AND vacuum do overcome the pressure of the spring. Unless you can set it so accurately and account for all atmospheric and pressure conditions you will have some points where you have boost then let the throttle off and the BOV won't open. The lower the pressure during surge, the less damage it may cause. A lot of old turbo cars never even ran them, but they also only ran ~6psi of boost.
