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93 coupe boost problem

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Old Nov 6, 2006 | 09:37 AM
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Default 93 coupe boost problem
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Last edited by spider228; Dec 17, 2006 at 02:20 PM.
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Old Nov 6, 2006 | 11:59 AM
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Default Re: 93 coupe boost problem
Originally Posted by spider228
ive got a y7 in my coupe and just upgraded to a t3/t4 turbo with ex. wastegate from a t25/ internal gate. i got an 8.6lb spring and everytime the wastegate opens up a 8lbs the car starts to missfire. i can hold half pedal at 5lbs and it wont missfire. it only happens when the gate opens up when im full pedal. im so confussed.
Check spark plug gap.. get a one step colder plug compared to OEM's and gap to .030
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Old Nov 6, 2006 | 12:02 PM
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Default Re: 93 coupe boost problem
sounds like detonation. What type fuel management you running?
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Old Nov 6, 2006 | 12:33 PM
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Default Re: 93 coupe boost problem
What is your air fuel ratio? What is your timing? What engine management? What spark plugs? Were do you get your fuel? ect... If you give us more info we will be better able to help you.
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Old Nov 6, 2006 | 01:39 PM
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Default Re: 93 coupe boost problem
doesn't sound like detonation...

specs would be helpful.
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Old Nov 6, 2006 | 01:48 PM
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Default Re: 93 coupe boost problem
Originally Posted by kyle h.
doesn't sound like detonation...

specs would be helpful.
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Old Nov 6, 2006 | 03:30 PM
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Default Re: 93 coupe boost problem
im running NGK that are gapped at .30. my air/fuel is perfect. ive got 255 pump, 390cc dsm injectors with resistor box, aem rail/fpr, vortec fmu. timing has been retarded 3 degrees using timing light. also a buddy club stage 3 turbo cam.
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Old Nov 6, 2006 | 03:52 PM
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Default Re: 93 coupe boost problem
Hmm, well some like even less gap, like .028, you could try it..

have you replaced cap/rotor ever?

EDIT: post up your spark plug number.. you should be running a step colder for sure.. imo
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Old Nov 6, 2006 | 04:04 PM
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Default Re: 93 coupe boost problem
i got the msd cap/rotor for my msd ignition with ex. coil.
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Old Nov 6, 2006 | 04:17 PM
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Default Re: 93 coupe boost problem
Originally Posted by spider228
i got the msd cap/rotor for my msd ignition with ex. coil.
Wow,

I would really try gapping to .028, it couldnt hurt..

Also:

I'm guessing you are using a free rom editor to scale the injectors, this is def. completely wrong but check to see if you have boost cut enabled/set low etc.. It woudl feel like hitting a brick wall but your story wasnt super descriptive so i thought i would throw that in..

Def. post up the spark plug you are using..
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