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Thread: adjusting fuel tp (load ) scales

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Posts: 1-5 of 5
2012-07-09 22:32:18
#1
adjusting fuel tp (load ) scales
since tp=k*q/n ( K=injector k value, q is from the maf vq table, and n is rpm)
going from a 333inj to a 520inj =~.640
multiply old injector k by .640 to get new k value.
question is...
looks to me that we rescale by multiplying the old tp scales by .640 also?
say this isn't so. i've been going the other way by increasing the values in my tp scales:o
Last edited by Teal97 on 2012-07-09 at 23-25-30.
2012-07-10 00:40:05
#2
I was wondering the same thing man...I've just been logging my runs and watching my tp colums at wot and then setting the values close as possible at the last colum
2012-07-10 01:20:33
#3
Bigger K value means larger TP, means larger TP scales needed. You can try to use the multiplication variable to increase the TP scales, or just do one run (cruising and WOT) and data log it and see where you are at.
2012-07-10 03:25:47
#4
so smaller K means smaller tp scales, right?
ok 333(ve)/520(sti)=.64
so i multiplied .64 times the standard values in the ve-ve fuel and timing tp scales, using tprt. took her for a spin. seems to run ok.
i (was) setting my fuel tp scales much higher. like adding 50% to the last few columns. hmm, wonder what affect that has on peak whp output, even though the afr's were o.k.?
i did notice this last time on the dyno that the changes i made to the last 2 columns of the fuel map had very little effect on the actual afr's read/displayed by the zeitronics wb
if i could only datalog
Last edited by Teal97 on 2012-07-10 at 03-30-15.
2012-07-10 06:48:43
#5
why cant you datalog?

i find when starting with a fresh tune its best to do your calculations based off of 259cc injectors since thats what the ecu was stock, i've gotten much better results that way, then again i use nistune..
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