2-bar SD to LPE 100mm, How to?
06-03-2008, 08:55 PM
#31
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Hmm, New england weather? Haven't touched my truck in almost a year with the Turbo and my wife drove it most of the time.I run 2 bar SD with the short terms enabled.Runs a perfect 14.7-1 all the time except under boost.
06-03-2008, 09:05 PM
#33
45 minutes is too long? You need a different tuner if this is his reason for not doing SD. What he's really telling you is "I don't know what SD is and am going to slap some timing on your ride and verify the PE."
RUN, don't walk, AWAY.
Idle surging has about 0% to do with SD vs. MAF and 100% to do with idle tuning (which takes longer than SD).
RUN, don't walk, AWAY.
Idle surging has about 0% to do with SD vs. MAF and 100% to do with idle tuning (which takes longer than SD).
or maybe that's just me?
06-04-2008, 12:03 AM
#34
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Thats for Ve correctin which is a good thing. But if u plan on closing the loop and using your o2's to trim your fueling, yur ve doesnt have to be necesarily PERFECT.
06-04-2008, 08:14 AM
#35
Most of people I see self tuning (myself included at times) let their perfectionism run riot, or are merely trying to tune stuff in the VE that the VE can't correct. Plus any pro tuner worth the spit that's hanging out under your tongue is going to do SD on a dyno and map the whole damn table once. On the street, it can still be done that fast but you're only going to get the part of the table that you hit, so make sure you hit all of your "driving range" -- oh, and make sure you set up your tune for SD tuning (not SD driving) before you start (zero out temp adaptation tables, use ONE timing table, go OLSD, etc., etc.)
06-04-2008, 08:16 AM
#36
You can after months and months of VE table tuning (as I used to do on the way to work
-- but only for Florida "non-summer") narrow the variance to +/- 2%, but you will never produce a 0% variance VE.
06-04-2008, 08:21 AM
#37
Just find a nice route that let's you load up the engine a few times (nice big New England hills work nicely I;ve found 
) or use your brake while driving, and it gets relatively easy to hit all the cells that matter.
Do it stepwise -- get your low throttle stuff and idle cells mapped (and then FREEZE them), get your normal driving cells mapped (and ignore changes to the first set that are within +/- 4% of 100. Then do your WOT with the same criteria. WOT for big HP is not great to do on the street unless you have a nice, wide country road with no traffic on it.
) or use your brake while driving, and it gets relatively easy to hit all the cells that matter.Do it stepwise -- get your low throttle stuff and idle cells mapped (and then FREEZE them), get your normal driving cells mapped (and ignore changes to the first set that are within +/- 4% of 100. Then do your WOT with the same criteria. WOT for big HP is not great to do on the street unless you have a nice, wide country road with no traffic on it.
06-04-2008, 04:52 PM
#40
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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, AND no a Ve table will never be perfect, but ones with positive trims ends up being dumped on top of your fueling table ending up in being overlly rich...