Tuning for head swap / lower compression ?
05-18-2005, 03:32 PM
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Tuning for head swap / lower compression ? I went from 11.1:1 to 9.8:1 compression over the weekend with a head swap, I have a 222/224 114 cam and HPTuners.
Having a little trouble with hot starts now, stumbling to life and sometimes requiring a little pedal to keep it running until it smooths out. What tables do I need to adjust ?
I had previously reduced the low RPM idle VE somewhat to help with low RPM surging on the old heads setup (which worked great and helped considerably with cold starts).
I found with the swap to the new heads that the idle range was struggling and sputtering after the head swap (like it did when I went too far lowering the VE during testing), so I just now swapped the stock VE table back in, seemed a little better idle but still has the hot start issue.
Do I need to find a happy medium between stock and where I had it ? (I had it at 2000/90%, 1600/90%, 1200/85%, 800/85%, 400/85%).
Thanks for any help.
Rob (Bad30th)
Having a little trouble with hot starts now, stumbling to life and sometimes requiring a little pedal to keep it running until it smooths out. What tables do I need to adjust ?
I had previously reduced the low RPM idle VE somewhat to help with low RPM surging on the old heads setup (which worked great and helped considerably with cold starts).
I found with the swap to the new heads that the idle range was struggling and sputtering after the head swap (like it did when I went too far lowering the VE during testing), so I just now swapped the stock VE table back in, seemed a little better idle but still has the hot start issue.
Do I need to find a happy medium between stock and where I had it ? (I had it at 2000/90%, 1600/90%, 1200/85%, 800/85%, 400/85%).
Thanks for any help.
Rob (Bad30th)
