:::RHMT::: Real Home Made Turbo
General Category => Engine Management => Topic started by: TTC on August 11, 2010, 11:32:34 PM
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I'm wondering why you have to have so many Kpa bins in vaccuum and so few in boost.
for instance mine goes:
25
35
45
50
62
75
88
105
135
170
205
250
Wouldn I not want a few more bins in the boost area, I understand the vac area is for cruise and general drivability. But is it ok to lose one or two?
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IMO I rather have more resolution in cruising state than in boost, as u know though it's up to what the motor wants or is in need of, some have drastic changes in VE per diff load some don't.
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I just wonder how much timing is reduced per kpa. Like from 205 to 210 if the timing map is 30 to 25, is that like 1 degree per kpa? Or is that ecu dependant
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Six boost scalar three bar Hondata shit is ignorant.
With a working O2 sensor you need two idle scalars on either side of where the engine idles and one scalar right before you change target AFRs.
Say you idle at 28 kpa, make your idle scalars 24 and 32. You want to switch from 14.7:1 stoch to 13.5:1 at -8 in/Hg, so you make a stoich scalar at 55 kpa and a 13.5:1 scalar at 60 kpa. Repeat this again at 100 and 110 kpa. That's 5 NA scalars, leaving the other 7 (including 110) as boost scalars.
Keep in mind that if you have a lambda logging that populates cells you're going to be confused. You want to look at the AFR values *between* these target AFR scalars. Keep in mind that being off a half point in idle/cruise is irrelevant with an O2 sensor, NA acceleration area on a turbo car is bullshit and doesn't mean anything if you are targetting 13.5 but getting 12.8-13.5, and it's the boost region you want to be precise with in order to safeguard the engine.
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I'm assuming that most of these pints are for closed loop operation with lambda correction. Currently I have left that on the back burner since I'm not using it.
When yous say two idle scalers, u mean one on each side opposite of where you idle.
For instance if im idling at 53kpa or -7hg, for some reason the calc mi using doesnt agree with this conversion
so my bottom KPA scaler wold be 50 kpa and my next one would be 60kpa? There would be no need for lower kpa scales ? Or should the bottom one be an extreme value like 20 kpa as an endpiont.
When targeting AFRS with a table, do u want the target to be in the cell before? for instance lets say at 200kpa u want 11:5 afrs, so u would set your target afr at 190kpa and 12 then 210kpa and 11? Or just make it 200kpa 11:5. IF u do it the previous way im assuming that it willl hit the desired afr as a median.
Ideally I guess this would work if im almost correct. ON the boost scalers going up approx 3lbs per cell
20kpa
50 kpa
60
80
100
120
140
160
180
200
220
250
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nice