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VR V-8 SS

Discussion in 'VR - VS' started by Deuce, Oct 14, 2012.

  1. Deuce

    Deuce Super Stock

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    Does it take a few starts to relearn tps and iac positions?
    I adjusted tps another mm or 2. And also backed off idle screw 1/4 turn. But haven't checked IAC steps while hot yet.
    It stalled in traffic at cold idle a few times this morning.
     
  2. Deuce

    Deuce Super Stock

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    Cancel that: IAC constantly adjusts. I got home and plugged car in, I found I had screwed wrong way and was at 130steps. So adjusted back, shut off, restarted - repeat a 1/2 doz times and got it sitting around 19-21 steps IAC hot idle.

    Car sounded awesome at 500rpm idle, but really not practical.
    It is now around 750rpm hot.
     
    Last edited: Mar 5, 2020
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  3. afstruct

    afstruct Well-Known Member

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    Dam!!!, but being used=yeah!!!
     
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  4. Deuce

    Deuce Super Stock

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  5. Deuce

    Deuce Super Stock

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    Pulled 8 plugs today, re-gapped them to around 1mm. They all look okay.
    IMG_20200510_102820.jpg
    So back in they go.

    Genuine AC delco plugs if anyone is wondering.
     
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  6. delcowizzid

    delcowizzid on holiday

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    Can see the come distribution issues clear as day on the plugs some have the timing perfect heat mark on the earth strap in the middle of the bend the others have far to much timing at hot all the way past the weld holding the earth strap on. Run the wide open fueling richer than normal to keep those 4 inline and the other 3 or 4 cylinders will just have to run too rich
     
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  7. Deuce

    Deuce Super Stock

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    Cheers mate,
    How much richer would you like? 12:1?
    11:1? Surely no more than that.

    From memory WOT max torque is pig rich 8:1 at the moment and needs fuel pulled.
     
  8. immortality

    immortality Can't live without smoky bacon! Staff Member

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    There is a lean spot at WOT after a rich spot. We'll get that sorted when I can come down your way.
     
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  9. delcowizzid

    delcowizzid on holiday

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    Hard to say how rich it would need to go on the wideband reading all the cylinders to average out the rich and lean cylinders mid 12s is a good start the difference from 12.5 to 13 is only like 5hp. I would put the wideband in the side that has the most number of lean plugs and go off that reading and tune that side to 12.4 12.5 but it's hard to make power with 8 holes all making different hp fighting each other haha
     
  10. Deuce

    Deuce Super Stock

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    What do you think the delay is between rpm hit and W/B read with current O2 placement?
    Could it be a few 100rpm late and we have adjusted afr at the wrong rpm?
    Or coincidental.
    Asking because this is what I did with my bike when reading afr up the tail pipe years back.
     
  11. Deuce

    Deuce Super Stock

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    Picture shows driver side on left and passenger side on right.
    Talk about that mani says with front elbow the drivers side runs leaner and that is where W/B O2 is located.
     
  12. immortality

    immortality Can't live without smoky bacon! Staff Member

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    Looking at the datalog, it's sitting mid 12's at about 4000rpm but leaning out between 5000 - 6000rpm into the 13's. Have a look at the last email I sent through with the WB data table.

    Maybe in the next couple of weeks when the alert level drops I'll be able to shoot down your way for a cruise and some tuning.
     
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  13. Deuce

    Deuce Super Stock

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    That would be great.
     
  14. delcowizzid

    delcowizzid on holiday

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    Looks like passenger side is leaner on more plugs than the drivers side in your pic. I would do a log with wideband in each side
     
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  15. gtrboyy

    gtrboyy Well-Known Member

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    Allports mucked around with an early come twin for a customer when first ones had flat top cover...he said they'd work better with air splitter to disperse the air.

    It looked like an upside down toblerone underneath to cover.

    I've noticed alot of the new ls intakes & even plazmaman manifolds have throttle up higher over plenum then curves down.Bliss Custom do it to on their new holden v8 manifold....will view it up close next summernats.
     

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