I just bought a 2006 apex with a mcx rear mount turbo and was out on my first ride today and at full throttle it cuts out and spits and spudders.I turned the boost up and down and it got worse at higher boost settings.I am running straight av gas.Im new to the 4-stroke turbo so any help would be great.At any setting i could only get 9-10 pounds and it would only run desent at half throttle.
In need of turbo apex help
- Thread starter jimmy900
- Start date
Could be a couple things....
1) Full throttle and sputtering could be bad clutch setup. Are you overreving, as in over 11,000 rpms?
2) Do you have a wide band? The cutting out and spit and sputter could mean you're running lean, you need to check all of the hoses that feed the map sensor. A leaky hose or connection will not allow the map sensor to see all of the boost your running and not give it enough fuel. I addition, the standard mcx setup ties the map, the bov, and your boost gauge all from one hose. If the bov doesnt get a good pressure signal, it will leak and will not let you get full boost.
3) Limited boost could be an exhaust leak, exhaust restriction, or a charge air leak. The mcx setups will have leaks on the short flexible header tubes. Mine will crack on the r/h cylinder header tube. I go through one per season. If it's still using the factory y-pipe header which is ti, take a good look at it. These things will collapse over time and will make it run crappy. The intercooler and throttle body couplers can pop off if not installed right. All of these will make it slow to build boost and the boost will not come all the way up.
4) Take the cover off your mcx fuel control box (should be mounted on the front of the battery box). Take a some compressed air and blow out the inside of the box. Condensation in the box will make it act up.
Good luck
1) Full throttle and sputtering could be bad clutch setup. Are you overreving, as in over 11,000 rpms?
2) Do you have a wide band? The cutting out and spit and sputter could mean you're running lean, you need to check all of the hoses that feed the map sensor. A leaky hose or connection will not allow the map sensor to see all of the boost your running and not give it enough fuel. I addition, the standard mcx setup ties the map, the bov, and your boost gauge all from one hose. If the bov doesnt get a good pressure signal, it will leak and will not let you get full boost.
3) Limited boost could be an exhaust leak, exhaust restriction, or a charge air leak. The mcx setups will have leaks on the short flexible header tubes. Mine will crack on the r/h cylinder header tube. I go through one per season. If it's still using the factory y-pipe header which is ti, take a good look at it. These things will collapse over time and will make it run crappy. The intercooler and throttle body couplers can pop off if not installed right. All of these will make it slow to build boost and the boost will not come all the way up.
4) Take the cover off your mcx fuel control box (should be mounted on the front of the battery box). Take a some compressed air and blow out the inside of the box. Condensation in the box will make it act up.
Good luck
Thanks for the input,i will check it out and hopefully see the problem.And no it is not overreving,it will hit 10400 for a short burst before falling off full boost and having to keep it at half throttle.
Is there any certain way to test for leaks or just check and tighten all clamps and check hoses?
leak test
If you unhook the turbo to intercooler hose and build adapter to pressurize to 30# from air compressor and listen for leaks. Wiggle test everything and every hose that carries air.
If you unhook the turbo to intercooler hose and build adapter to pressurize to 30# from air compressor and listen for leaks. Wiggle test everything and every hose that carries air.
My buddys did that same thing and it was the sensor for the mcx box.
Update-found a pin hole leak in one of the lines that go to my boost gauge and fixed that,but there is a billet bov that is mounted before the intercooler that when aired up it is leaking.Is there a way to adjust it or do i need a new one?and where to buy one?Thanks
What do you mean the bov is leaking?
when i start to fill with air the bov starts leaking air out no matter low or high boost readings
