2-bar SD to LPE 100mm, How to?
06-04-2008, 05:19 PM
#41
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With hptuners I have found that by biasing the ECT vs IAT compensator more toward the engine coolent, helps keep the trims in line for weather changes...
06-04-2008, 05:20 PM
#42
My whole thing is, I don't want to have to do any of it. I might not have to. for all i know it's dead on right now. Not even sure how i'd know if it wasn't.
Here's a dumb question that I should probably know the answer to: am I open loop or closed loop on cold startup? It runs da bomb on cold starts. The poor idle comes on after it warms up and the afr settles in to 14.7.
Here's a dumb question that I should probably know the answer to: am I open loop or closed loop on cold startup? It runs da bomb on cold starts. The poor idle comes on after it warms up and the afr settles in to 14.7.
06-04-2008, 09:34 PM
#45
just for giggles i went out in the garage a little while ago and fired it up and let it idle. it was fine at first, then as it warmed up it started surging and almost stalled a few times. then a few min later it was perfect.
i shut it off, started it up again and put it in R and let it idle. seemed good. then i threw it in N, it stumbled. then i went, D N R N with about 2 sec between shifts. it stalled.
I then took it for a 1 mile drive. it stalled as I was parking. Then it stalled as i backed out of the parking spot. then it stalled at the end of the parking lot. Then it stalled when i pulled in my garage. lol. wow
i shut it off, started it up again and put it in R and let it idle. seemed good. then i threw it in N, it stumbled. then i went, D N R N with about 2 sec between shifts. it stalled.
I then took it for a 1 mile drive. it stalled as I was parking. Then it stalled as i backed out of the parking spot. then it stalled at the end of the parking lot. Then it stalled when i pulled in my garage. lol. wow
06-04-2008, 09:38 PM
#46
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I bet it needs a RAFIG type of process. I think you went from turbo to supercharged. The rafigstuff corrects you idle airflows by adding in your idle trims simply put. I went from N\A to turbo and mine liked to stall. With the third 60e blown im not real worried about it right now hehe. And you idle table it corrects go from like -40 up to 250 ish. Its based off of your ECT. Seems to me it would correct a lot of that. But that my guess.
06-04-2008, 10:25 PM
#47
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I bet it needs a RAFIG type of process. I think you went from turbo to supercharged. The rafigstuff corrects you idle airflows by adding in your idle trims simply put. I went from N\A to turbo and mine liked to stall. With the third 60e blown im not real worried about it right now hehe. And you idle table it corrects go from like -40 up to 250 ish. Its based off of your ECT. Seems to me it would correct a lot of that. But that my guess.
06-05-2008, 12:16 AM
#48
Altho he can chime in i think he mean that having it set up for sd tuning you must have some multiplier and other things off. Things like the IAT multiplier that are used to compensate for temp changes should be set to 1 IMO then based on you average IAT temp set them and scale them from there. You want to turn off all of the influences you can and tune, then re-enable them to compenaste for changes now that you are SD driving,
You always have +/- 4% to 10% (depending on who you listen to). You can't guarantee your VE will have negative trims.
06-05-2008, 09:59 PM
#49
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You can tune for climate changes with 2 bar, it's not difficult. Sounds like your tuner is not that experienced. Might be better off looking for a new tuner instead of a new MAF. The problem with going back to a MAF setup is that regardless of the physical size or flow capacity of the MAF, your PCM is still limited to a max of 512 g/sec airfllow through the MAF. The MAF itself may be able to read higher, but the PCM has hard coded limits on how much it will recognize.
06-05-2008, 10:24 PM
#50
Another reason why it might run like crap once it is warmed up, that your going into Closed Loop.... At startup you truck is running in Open loop.... Just another reason to go Open Loop Speed Density...
Just my .02.... I hope you get it worked out...