Power FC Length of transition for stock twins
#1
Length of transition for stock twins
I have a pair of Hallman MBCs with cabin controllers and am trying to fine tune my transition. I have a boost pattern of 0.84-0.62-0.84kg/cm2 and, according to my Datalogit logs, a 0.4 second transition (that is, the length of time between the final primary 0.84kg/cm2 setting to the first secondary 0.84kg/cm2 setting, with some error margin).
The transition certainly feels quick but I was wondering what typical transition times people are seeing in their logs.
The transition certainly feels quick but I was wondering what typical transition times people are seeing in their logs.
#2
Eye In The Sky
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You are the first that I know of to log this and ask about it.
With the DL, Settings 1 - Turbo Transition; you can lower the HIGH RPM side to see what happnes. One person tried this and said that it helped his turbo responce.
With the DL, Settings 1 - Turbo Transition; you can lower the HIGH RPM side to see what happnes. One person tried this and said that it helped his turbo responce.
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^I've lowered the high on mine about 80-100rpms, although I haven't logged to see how it affected it. I might try that in the next week or so, I haven't really thought to.
In reality it would be best to have the quickest(full boost) transition at the lowest possible rpms, since when both turbos are open you have a good bit more air flow, which should help the power band.
In reality it would be best to have the quickest(full boost) transition at the lowest possible rpms, since when both turbos are open you have a good bit more air flow, which should help the power band.
#4
Thanks. I'll try playing with the high rpm setting.
Funny - there are many, many threads discussing transition but no real quantification of what a quick transition would be. A 0.4 second transition certainly feels quick (whereas 0.7 seconds feels like a pause) but I have no idea if, say, 0.2 seconds would be possible.
Funny - there are many, many threads discussing transition but no real quantification of what a quick transition would be. A 0.4 second transition certainly feels quick (whereas 0.7 seconds feels like a pause) but I have no idea if, say, 0.2 seconds would be possible.
#5
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This is due to the fact that many of us pioneers of the PFC/DL went non-seq or single turbo before or about the time that the PFC/DL came out. Thus we never did the experimentation with it.
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