Car is Ridiculously Slow
Jan 31, 2012, 06:10 PM
#1
Car is Ridiculously Slow
Out of nowhere, my car has just become slow. I'm sorta narrowing it down to a boost leak or a blown turbo but I'm not familiar with symptoms of either of these.
Basically, my car is maybe half as fast as it normally is and it's only in boost meaning that the car still has the same off-boost torque (what little it had
) as it's always had which leads me to believe it's not motor related. When I hit boost however, it'll initially feel as it should but then it'd fall on its face and not go anywhere. At this time, the exhaust note will sound different too. I can't explain it but the tone/pitch is different. Continuing at WOT, the car will sometimes return to normal acceleration and then go back to falling on its face numerous times throughout the powerband. Sometimes it will just fall on its face and stay there. The lack of acceleration is embarrassing
Anybody recognize these symptoms?
Thanks in advance!
UPDATE: I hooked up my boost gauge and it's reading 11psi under boost which tells me it's running off wastegate pressure. I do not have an MBC and the vacuum lines all look to be in good condition and hooked up. What does this leave? Torn wastegate diaphragm? Anything else it could possibly be?
Basically, my car is maybe half as fast as it normally is and it's only in boost meaning that the car still has the same off-boost torque (what little it had
) as it's always had which leads me to believe it's not motor related. When I hit boost however, it'll initially feel as it should but then it'd fall on its face and not go anywhere. At this time, the exhaust note will sound different too. I can't explain it but the tone/pitch is different. Continuing at WOT, the car will sometimes return to normal acceleration and then go back to falling on its face numerous times throughout the powerband. Sometimes it will just fall on its face and stay there. The lack of acceleration is embarrassing Anybody recognize these symptoms?
Thanks in advance!
UPDATE: I hooked up my boost gauge and it's reading 11psi under boost which tells me it's running off wastegate pressure. I do not have an MBC and the vacuum lines all look to be in good condition and hooked up. What does this leave? Torn wastegate diaphragm? Anything else it could possibly be?
Last edited by Babs; Feb 3, 2012 at 06:10 AM.
Jan 31, 2012, 06:19 PM
#2
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Do a boost leak and eliminate that, takes 10 minutes. I had some misfire due to improperly gaped plugs that exhibited similar acceleration problems, check plugs. Any CEL's?
Jan 31, 2012, 06:41 PM
#3
I do need to do a boost leak test though...I'm not sure if it's just me but it sounds like the turbo isn't spooling as high as it normally does too.
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Jan 31, 2012, 07:14 PM
#8
I just didn't want to mess anything up more than it was seeing the terrible luck I always have with my car hahaha
Thanks man! See ya tomorrow
Feb 3, 2012, 11:54 AM
#12
A lot of people have provided you a really great suggestion: Boost leak test. Please do it and then report back what you find. If you don't want to / know how to do the test, take it to a reputable shop and have them do it. If you don't have the money or time to have a shop do it and don't want to do it on your own, then you probably shouldn't own an Evo. That's my opinion anyway and you know what they say about opinions...
Feb 3, 2012, 12:16 PM
#13
A lot of people have provided you a really great suggestion: Boost leak test. Please do it and then report back what you find. If you don't want to / know how to do the test, take it to a reputable shop and have them do it. If you don't have the money or time to have a shop do it and don't want to do it on your own, then you probably shouldn't own an Evo. That's my opinion anyway and you know what they say about opinions...
I'm asking if anybody has any ideas what on the wastegate could've failed such as the diaphragm or something like that.
And seeing that I rebuilt the motor on the car and did 99% of the work myself, I think I know enough to "earn the right" to "own an Evo".
If you don't have a reasonable answer, don't bother replying.
Feb 3, 2012, 12:20 PM
#14
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What do you use for boost control? You mentioned you don't have a MBC, so I would assume its an electronic boost controller?
If this is true, perhaps the solenoid quit on you.
-Bink
If this is true, perhaps the solenoid quit on you.
-Bink
Feb 3, 2012, 12:25 PM
#15
I don't think you're understanding very well. It's boosting 11psi which is commonly known as the base wastegate pressure which means it has something to do with the wastegate. My car was running 30psi before this, for the car to lose 20psi through a leak would be ridiculous and the hole that it was leaking through would be gaping.
I'm asking if anybody has any ideas what on the wastegate could've failed such as the diaphragm or something like that.
And seeing that I rebuilt the motor on the car and did 99% of the work myself, I think I know enough to "earn the right" to "own an Evo".
If you don't have a reasonable answer, don't bother replying.
I'm asking if anybody has any ideas what on the wastegate could've failed such as the diaphragm or something like that.
And seeing that I rebuilt the motor on the car and did 99% of the work myself, I think I know enough to "earn the right" to "own an Evo".
If you don't have a reasonable answer, don't bother replying.
Good luck, you'll need it.