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More boost, slower ET

Old Mar 9, 2016 | 06:14 PM
  #71  
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I go back and forth about increasing timing to 14 degrees on 14-15psi...

I plan on spraying 50/50 water/meth mixture too by the way. Didn't mention that.
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Old Mar 9, 2016 | 06:43 PM
  #72  
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Originally Posted by stock48
I hate how the 4L80's do that. Mine shifts all over the place and lockup is same way. They are really picky with the shift mph vs rpm and converter slip jacks with it. I hav mine commanded to lock at 117 mph and it's about 125 before it locks. Much over 6500 RPM will need a dual spring to be good. Sounds like you are on the right track. The stock intake, meth and 2 deg of timing will prob put it at low 11's if you do it before the weather gets hot.
Play with your mph and shift rpm. Mine and others I've tuned will shift within 50rpm of commanded.
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Old Mar 9, 2016 | 07:13 PM
  #73  
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Originally Posted by lycominghunter
I go back and forth about increasing timing to 14 degrees on 14-15psi...

I plan on spraying 50/50 water/meth mixture too by the way. Didn't mention that.
Do full meth or was that you that said you couldnt cause of cheap pump?
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Old Mar 9, 2016 | 08:06 PM
  #74  
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George, don't think that was me. I don't recall seeing anyone stated that a snow performance pump failed due to running full meth, although I do know some have reservations about the quality of their pumps...
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Old Mar 9, 2016 | 08:20 PM
  #75  
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If that pump will do full meth then by all means run it

Im not fan of water/mix
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Old Mar 9, 2016 | 08:54 PM
  #76  
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Originally Posted by 03sierraslt
Play with your mph and shift rpm. Mine and others I've tuned will shift within 50rpm of commanded.
How much power?

When you put 1000+ to an 80 they shift erratically at wot. Sometimes 6100, sometimes 6400. Parish had this issues years ago. I'd love to know a solution
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Old Mar 9, 2016 | 09:10 PM
  #77  
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Originally Posted by GMCtrk
How much power?

When you put 1000+ to an 80 they shift erratically at wot. Sometimes 6100, sometimes 6400. Parish had this issues years ago. I'd love to know a solution
I would describe my 2->3 WOT shifting as erratic, as well as when the converter locks at WOT. I'm sure my trans would benefit from a rebuild. Sadly, I'm only low/mid 500's in the horsepower department judging from my time slips.

My friend, member on here, said that 1 of his 80e's shifted erratically, and that his past 2 have behaved appropriately. Fastjweb's seems to shift on the money and he's closer to 600hp based on ET...its also a fresh rebuild.

Last edited by lycominghunter; Mar 9, 2016 at 09:20 PM.
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Old Mar 9, 2016 | 09:14 PM
  #78  
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My lockup seems to hit right on command around 100 mph.
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Old Mar 9, 2016 | 09:16 PM
  #79  
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I had my shift commanded at 5300, it finally did around 6200rpm.
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Old Mar 9, 2016 | 09:23 PM
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Mine so far is hitting command unless im spinning badly
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