Help! Boost only w/ full throttle and above 4,500
Aug 14, 2009, 09:40 PM
#1
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Help! Boost only w/ full throttle and above 4,500
Need some troubleshooting advice. Car won't build boost until approx 4500 rpm with max throttle. Max boost i get right now is about 7.5 psi. Messed with the boost controller to see if that was the issue (wasn't). I even have the car set up right now to just use wastegate pressure w/ no luck.
Did a boost leak test and car was leaking bad. Found a leaking hose off of the intake manifold. Replaced the hose. Accomplished another leak test, and car is rock steady at 25 psi; but car is still doing the same problem described above.
I bought the car and pretty sure it had some mods on it previously, but returned to stock (except it has a downpipe on it now.) I am thinking the turbo has just gone bad, or maybe the flash on the ECU is for mods that were previously on the car, and wasn't flashed back to stock??
Also, how do you really test the turbo wastegate?
Any input is appreciated. THANKS
Did a boost leak test and car was leaking bad. Found a leaking hose off of the intake manifold. Replaced the hose. Accomplished another leak test, and car is rock steady at 25 psi; but car is still doing the same problem described above.
I bought the car and pretty sure it had some mods on it previously, but returned to stock (except it has a downpipe on it now.) I am thinking the turbo has just gone bad, or maybe the flash on the ECU is for mods that were previously on the car, and wasn't flashed back to stock??
Also, how do you really test the turbo wastegate?
Any input is appreciated. THANKS
Oct 28, 2009, 03:22 PM
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Need some troubleshooting advice. Car won't build boost until approx 4500 rpm with max throttle. Max boost i get right now is about 7.5 psi. Messed with the boost controller to see if that was the issue (wasn't). I even have the car set up right now to just use wastegate pressure w/ no luck.
Did a boost leak test and car was leaking bad. Found a leaking hose off of the intake manifold. Replaced the hose. Accomplished another leak test, and car is rock steady at 25 psi; but car is still doing the same problem described above.
I bought the car and pretty sure it had some mods on it previously, but returned to stock (except it has a downpipe on it now.) I am thinking the turbo has just gone bad, or maybe the flash on the ECU is for mods that were previously on the car, and wasn't flashed back to stock??
Also, how do you really test the turbo wastegate?
Any input is appreciated. THANKS
Did a boost leak test and car was leaking bad. Found a leaking hose off of the intake manifold. Replaced the hose. Accomplished another leak test, and car is rock steady at 25 psi; but car is still doing the same problem described above.
I bought the car and pretty sure it had some mods on it previously, but returned to stock (except it has a downpipe on it now.) I am thinking the turbo has just gone bad, or maybe the flash on the ECU is for mods that were previously on the car, and wasn't flashed back to stock??
Also, how do you really test the turbo wastegate?
Any input is appreciated. THANKS
Last edited by CWhiteRun; Oct 28, 2009 at 03:25 PM.
Dec 6, 2009, 12:09 PM
#5
the ecu only has control of the boost above wastegate spring pressure. I would be looking at the actually turbo, pull the intake and check the shaftplay. also make sure nothing is restriciting the air from entering the turbo such as the stock intake snorkel not be properly fastened to the rad support
Dec 13, 2009, 10:56 PM
#6
Have you check the compression? My friends Evo 9 dropped 4 lbs of boost , found that his rings were bad. If the compression is low it means less air going to the turbo. If compression is good move to the turbo. Compression would have to be very low to only make 7.5lbs.
