Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: 88 Corvette with 5.3

  1. #1
    Junior Member
    Join Date
    Apr 2020
    Posts
    10

    Default 88 Corvette with 5.3

    Hello all, stalking on the site for some time now, but mostly in the diesel section.

    I have a 5.3 with a big cam and LS6 intake, DBW throttle body and injectors(28.8).
    I am trying to get it started. I had a stock tune in it and pings like crazy. I did manage at one point to get it running and driving with a 15-20 min log, but would not idle for crap in P/N, in gear was decent. But now it will not start again.
    Did a lot of searching on but so far nothing has helped out and I seem to be going backwards now.
    Anyone have some solid suggestions and explain them in simple terms as I am still trying to figure out what I am doing.

    tune and log are attached. Any help would be greatly appreciated.

    Cam specs are:
    242/254 duration @ .050''
    113 lobe separation, 109 intake centerline (113+4)
    .621''/.612'' lift with 1.7 rockers

    Wideband: AEM 30-0300 and I do have it working via serial comms.
    Attached Files Attached Files

  2. #2
    Lifetime Member
    Join Date
    Aug 2013
    Posts
    735

    Default

    That cam's too big for a 5.3 engine.

  3. #3
    Lifetime Member
    Join Date
    Mar 2006
    Posts
    4,935

    Default

    Hate to say it, but agree with statesman on this. That would be a large cam on a 6.0 or 6.2. I found a similar cam on Cammotion's site, it's for rectangle port heads (which only work on 6.0L and larger bore size), recommended for 402-418ci, and a single plane intake (not a factory intake manifold).

    Search for the Calc.VET or Calc.MAFT processes on here, that will let you get the VE and MAF tables squared away. As for idle, search for the idle tutorial (also on here) and start being aggressive with changes. That cam is going to be tough to have it idle well in your setup.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  4. #4
    Junior Member
    Join Date
    Apr 2020
    Posts
    10

    Default

    Changed out the cam in the car. It now has a Summit 8707 specs are:
    226/238 @050 113+3 LSA, .600/.600 Lift.
    So far I have it running pretty good and have completed Calc.VET: correcting MAF and calculating VE (in single log) twice now and hopefully correctly, as P0102 is now gone.
    I would like some pointers on trying to get it to run better as it is running rich, still have P0101 code and the car will not idle when hot.
    Have not done RAFIG/RAFPN yet.
    Also an somebody tell me how to attach more files to this thread? I have tried several times now with no luck.
    Last edited by mflora; May 18th, 2020 at 03:00 PM.

  5. #5
    Junior Member
    Join Date
    Apr 2020
    Posts
    10

    Default

    Changed out the cam in the car. It now has a Summit 8707 specs are:
    226/238 @050 113+3 LSA, .600/.600 Lift.
    So far I have it running pretty good and have completed Calc.VET: correcting MAF and calculating VE (in single log) twice now and hopefully correctly, as P0102 is now gone.
    I would like some pointers on trying to get it to run better as it is running rich and still learning, still have P0101 code and the car will not idle when hot. Have not done RAFIG/RAFPN yet.
    Attached log and current tune. Log is only about 20 min.Log_0002.efiCorvette 1.1.ctz

  6. #6
    Junior Member
    Join Date
    Apr 2020
    Posts
    10

    Default 88 Corvette with 5.3

    Changed out the cam in the car. It now has a Summit 8707 specs are:
    226/238 @050 113+3 LSA, .600/.600 Lift.
    So far I have it running pretty good and have completed Calc.VET: correcting MAF and calculating VE (in single log) twice now and hopefully correctly, as P0102 is now gone.
    I would like some pointers on trying to get it to run better as it is running rich, still have P0101 code and the car will not idle when hot. Have not done RAFIG/RAFPN yet.
    Attached log and current tune. Log is only about 20 min.Log_0002.efi Corvette 1.1.ctz

  7. #7
    Junior Member
    Join Date
    Apr 2020
    Posts
    10

    Default

    Have a new cam in the car now (Summit 8707 Pro LS Cam). Have completed a couple of Calc.Vet sessions but sill having some idle problems. P0101 is still set and P0102 is gone. Have not yet completed RAFIG/PN for the idle yet. Trying to attach current tune and log for some advice, but I have tried twice now with no luck. Anyone have some pointers for attaching files when replying to a thread?

  8. #8
    Lifetime Member
    Join Date
    Mar 2006
    Posts
    4,935

    Default

    It's a bit convoluted: Click Go Advanced -> Manage Attachments -> Add Files -> Choose Files. Select the files and click Open. Then click Upload. Make sure they're selected, then click Done. They'll be attached to your reply when you post.

    Calc.VET won't help much with idle, you'll need to work on the idle separately as well. Calc.VET will get the airflow correct, but you'll need to work with IAC, throttle follower/cracker, and spark timing to dial the idle quality in.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  9. #9
    Junior Member
    Join Date
    Apr 2020
    Posts
    10

    Default

    Current tune and log. If someone could review and give me a few tips that would be awesome!
    Thanks for the info ScarabEpic22!
    Attached Files Attached Files

  10. #10
    Junior Member
    Join Date
    Apr 2020
    Posts
    10

    Default

    Just tried posting, said I have to wait for a moderator to approve.

Page 1 of 2 12 LastLast

Similar Threads

  1. c5 corvette
    By johnorb26 in forum Gen III V8 Specific
    Replies: 1
    Last Post: September 15th, 2015, 10:27 AM
  2. 2010 A6 Corvette Transmission in 2007 Corvette Model
    By epic in forum E37, E38 & E67 PFI ECM's
    Replies: 2
    Last Post: April 24th, 2013, 12:23 PM
  3. Will E38 from 08 Corvette work in 2007 Corvette?
    By Chalky in forum Gen IV V8 Specific
    Replies: 2
    Last Post: June 5th, 2010, 09:00 AM
  4. New Corvette
    By 5.7ute in forum Lounge
    Replies: 8
    Last Post: June 29th, 2009, 04:19 PM
  5. Tune 97 Corvette ?
    By RPO_Z06 in forum General (Petrol, Gas, Ethanol)
    Replies: 1
    Last Post: August 3rd, 2006, 04:23 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •