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Thread: Surge/spike when I shift?

  1. #1
    Junior SCH Member
    Join Date
    Feb 2004
    Posts
    6

    Surge/spike when I shift?

    I have a d1sc kit. I just changed some couplers and now when I put the clutch in to shift my engine revs/spikes/surges I don't know what to call it. I don't think I put the maf back indenticle to before but it's close. Do I need to retune it? I still have the stock junk bov. Should I change that peice?

  2. #2
    SCH Member
    Join Date
    Aug 2004
    Posts
    98
    Make sure the vacuum reference is still hooked up to the surge valve and the hose isn't cut, split, or pinched off. If all that is ok, the loosen the hose clamps at the MAF and rotate it slowly until the car starts running good again.

  3. #3
    Junior SCH Member
    Join Date
    Feb 2004
    Posts
    6
    How much vacuum should I have at idle? I am pulling roughly 10-12 inchs at idle. I checked all my vacuum lines and all were good. The bypass is opening. My tubing is all jacked up anyhow so I am going to redo everthing and have the car retuned for the meantime till I get my AEM and start doing things myself.
    D1SC-10psi stock 302 shortblock. 427 rwhp

  4. #4
    SCH Member
    Join Date
    Aug 2004
    Posts
    98
    Vacuum will vary depending on your cam. 10-12 sounds fine.

  5. #5
    Senior SCH Member
    Join Date
    Nov 2002
    Posts
    482
    It should be around 19 with a stock cam and short block.
    Chris
    9.05@152 with a T-Trim on BFG Drag Radials
    NMCA SR6381

  6. #6
    Junior SCH Member
    Join Date
    Feb 2004
    Posts
    6
    I have roller rockers so I am assuming thats where my loss is.
    D1SC-10psi stock 302 shortblock. 427 rwhp

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