Question about Bosch 1000cc Injectors
#32
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Do the latency values in the ECU actually reflect true values or are the scaling just something somebody came up with that roughly approximates what they think the values were?
Also, isn't there more then one latency values that are always used? Base Latency along with Battery Latency?
#33
Dan
#36
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The difference in e85 scaling between my RC 1200cc injectors is only ~88% while figures for rated flow (using 1150 cc and 880cc) are closer to 76%.
Unfortunately my IDC is ~90% on my current injectors, so unless I bumped base fuel pressure up (which I would, it just adds another cost and complexity to the setup) I'll be a bit low on flow for my current setup.
Let me know if you want me to take this question elsewhere, but it is semi-on-topic: Does anyone know of a 50 or 55psi base fuel pressure regulator that fits our rail and flows well enough (and still fills all other requirements IE 1:1 etc)?
Trims are bracketed by airflow hz. low -> mid ~50hz and mid -> high 1600hz
Last edited by fostytou; Aug 12, 2009 at 12:47 PM.
#39
Dan
#41
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No prob... you may notice that I did not use the exact latency numbers given out by the formula. I used it as a solid estimate and then added my own opinion before entering it into the ECU.
I figured that out for the most part. I was more interested in what changes High Trims tell me I should make if the numbers are out of wack.
Dan
I figured that out for the most part. I was more interested in what changes High Trims tell me I should make if the numbers are out of wack.
Dan
#42
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I guesstimated the latencies based on the cheat sheet that came with the injectors (since the battery values don't match). And have done some very minor adjustments to those values since. Have had the scaling from 835 to 750, currently at 790.
my town cruise is really close, the highway aspect of cruise wants to subtract more fuel. right now I think my trims run from +1 & -1 to about +8 idle and -8 cruise, depending on the drive conditions.
Since I've not heard others express the same issue concerning low speed cruise and high speed cruise I may have some more tuning to do.
used Travman's latencies and had to up the scaling to 835. strange because it was an increase in latencies from before. However I introduced a variable into the picture. Removed one of those restrictions from my exhaust. I continue to be amazed how much exhaust restrictions play in fuel maps too.
my town cruise is really close, the highway aspect of cruise wants to subtract more fuel. right now I think my trims run from +1 & -1 to about +8 idle and -8 cruise, depending on the drive conditions.
Since I've not heard others express the same issue concerning low speed cruise and high speed cruise I may have some more tuning to do.
used Travman's latencies and had to up the scaling to 835. strange because it was an increase in latencies from before. However I introduced a variable into the picture. Removed one of those restrictions from my exhaust. I continue to be amazed how much exhaust restrictions play in fuel maps too.
Last edited by nothere; Aug 16, 2009 at 03:33 PM.
#43
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Last edited by 0xDEAD; Aug 12, 2009 at 05:44 PM.
#44
After spending an hour cruising around town my Trims...
Low: -2.449
Mid: 3.042
High: No changes
These both stayed pretty stable after some time.
Good enough? Or should I make changes? Thanks.
Dan
(PS No problems with hot starts)
Low: -2.449
Mid: 3.042
High: No changes
These both stayed pretty stable after some time.
Good enough? Or should I make changes? Thanks.
Dan
(PS No problems with hot starts)
Last edited by rawkus; Aug 12, 2009 at 08:22 PM.