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2G High boost, slow acceleration

Posted by garytheberry, Aug 9, 2020

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  1. garytheberry

    garytheberry Probationary Member

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    New Braunfels, Texas
    Hey guys, I have a 1999 eclipse 4g63 and I’m having an issue where it makes boost easily but barely accelerates. When I hit the gas the boost skyrockets along with the rpm but I’m not going anywhere. By the time I get to third gear I have zero acceleration and at that point I can’t get the boost or rpm to go any higher. This all started happening immediately after I filled it up with gas for the first time. I had just been putting 5 gallons in at a time because the tires wouldn’t hold air to go any distance. Any ideas what is going on?
     
  2. jed344

    jed344 Supporting VIP

    943
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    Waterville, Iowa
    Boost leak test.
     

    1K  38

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  3. benspilk09

    benspilk09 Proven Member

    87
    43
    Joined Feb 16, 2010
    Little Rock, Arkansas
    Sounds like your clutch or transmission is slipping.
     

    Street Build 365  4

    1991 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  4. ErikTande

    ErikTande Supporting Member

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    Centennial, Colorado
    I agree.

    Take a video with sound so we can hear what's going on. The sound of a slipping clutch is hard to miss.
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
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  5. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Cincinnati, Ohio
    From his description, it doesn't sound like a clutch. His rpms doesn't climb.
     

    466  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    512  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

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    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
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  6. Buddy2

    Buddy2 Proven Member

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    Helsinki, Europe
    That sound pretty damn odd. Car is freerolling normally nothing feels like dragging? Can you drive car normaly with driving part thortle only to get higher speeds and use third/fourth gear normally?
     
    Last edited: Aug 10, 2020

    363  9

    1992 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    178  0

    1992 Mitsubishi Eclipse GSX
    manual · 1G DSM

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    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  7. Dsmbiz26

    Dsmbiz26 Probationary Member

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    Joined May 27, 2017
    Salem, Massachusetts
    i think if it was his clutch slipping he would hear/see the rpms climb as it slips. going to need more info, maybe post a log.
     

    220  4

    1994 Eagle Talon TSi
    awd · manual · 1G DSM
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  8. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Independence, Kansas
    His profile isn't filled out or we would know if it is a standard or an auto he is referring to. If it is an auto, check the trans fluid level when warm and in NEUTRAL.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    1K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    838  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  14  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  9. benspilk09

    benspilk09 Proven Member

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    Little Rock, Arkansas
    It says right in the original post that "the boost skyrockets along with the rpm"

    The transmission or clutch is slipping.
     

    Street Build 365  4

    1991 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  10. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I saw that too @benspilk09 and made me wonder if it was a stick or auto car.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    1K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    838  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  14  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  11. El Cuervo

    El Cuervo Proven Member

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    Well, since we don't have much information on the vehicle, but only what's on the first post, the only option that we have is to speculate, process of elimination and to just play the guessing game till the opener submits more info. So with this said, these are my opinions. I'll assume that it's a manual. So there is 2 very quick guesses here which are: boost leaks and slipping clutch.
    Can it be a boost leak? Well, it can have boost leaks yes because they are very common but, he is building boost after all. At what rpms? Who knows but he is building boost after all. So let's move that aside for the time being.
    How about slipping clutch? Ok it's possible because of the high revs and not going anywhere. However, I think he would have mention that he would be smelling clutch if there was alot slip but most important, he was building boost after all, which means that the engine was under enough load to build that X amount of boost that he claims.
    So is it clutch related? Maybe or maybe not?
    How about: timing. There is boost after all.
    Maybe he has knock and is regarding enough timing that the car will feel excessively sluggish at a higher rpm and boost.
    It's a possibility . Yes there is no logs or anything. We are simply going by what we have in the first post and our own personal experiences.
     
  12. jed344

    jed344 Supporting VIP

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    He did not even say if he has gauges or if his "building" boost is via the joke factory gauge going up. So not enough information to even give any real guess. I have tuned cars that had bad knock sensors as well as cars that have seen 7+ degrees of knock retard and even in stock form they still accelerate.
     

    1K  38

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  13. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Independence, Kansas
    Watch it be an auto low on fluid.......ROFL
    Hope to get more info.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    1K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    838  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  14  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  14. El Cuervo

    El Cuervo Proven Member

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    Omaha, Nebraska
    . Right!!! For all we know, he might be just revving it in neutral in his driveway to see if he can actually build boost. Who knows, the faint sound of a turbo on neutral does have a nice tone to it.
    Maybe he got bored and for a moment, let his imagination run wild and pretended that he was in an airplane or space ship that is about ready to take off. Just saying.... hahahaha
     
  15. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Independence, Kansas
    I always make the appropriate noises too when I do that.......(makes turbo and BOV noises) :shhh:
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    1K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    838  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  14  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  16. El Cuervo

    El Cuervo Proven Member

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    Omaha, Nebraska
    Well, I'm glad I'm not the only crazy one here. That makes 3 of us, including the opener by default LOLLOLLOL.
     
  17. garytheberry

    garytheberry Probationary Member

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    New Braunfels, Texas
    So I did a boost leak test. I hooked up the compressor to the turbo inlet with 20 psi and there were several leaks on the coupling and I did fix those and the car runs a lot better. However, there is a spot on the bov that is leaking. There are two nipples coming out of it, one of which has a hose attached to it and the other doesn’t. The nipple that has nothing attached to it is leaking. Is there supposed to be a hose connected to it? The car is a manual and I really don’t think the clutch is slipping as it shifts smooth and engages quickly. Also I did a few tests on the Wastegate actuator and it does not hold pressure.
     
  18. garytheberry

    garytheberry Probationary Member

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    New Braunfels, Texas
    Also the stock boost gauge is on there so it’s basically useless
     
  19. jpmxrider489

    jpmxrider489 Supporting VIP

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    pittsburgh, Pennsylvania

    After reading most of this post, I figured I would add my personal experience. A clutch slipping would feel like a stutter. The car wouldn't want to move but rpm and boost can go up. I have felt this with a act 2100 and 2600. I'm currently on the 2900.

    Have you replaced plugs and wires? I was chasing a issue similar, it ended up being a bad coil. We found it by stress testing the coil. One coil was arcing at idle that you couldn't see. The other coil was arcing at 25psi. Apparently I had all the bad oem coils on the east coast LOL.
     

    Street Build 270  1

    1995 Eagle Talon TSi
    fwd · automatic · 2G DSM

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    1995 Eagle Talon TSi
    fwd · automatic · 2G DSM
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