Precision 780cc injector voltage offset

jew · Post by **jew** » Thu Nov 01, 2007 1:00 pm

i can't seem to find any information about how to fill in the voltage offset table in hondata. when i called precision, they were only able to tell me that the offset is .998ms at 13.6v but they had no idea on what to fill in for the rest of the table. do i just put those values all the way across the table or what?

Post by **Hondata** » Mon Nov 05, 2007 10:05 am

Sorry, that's something which either the injector manufacturer has to provide or can be found by testing on the dyno.

jew · Post by **jew** » Mon Nov 05, 2007 5:05 pm

wow that sucks. i called both rc and precision and both told me that for table values i have to ask hondata. they said they only have the one value combination of 13.6v/.998ms. now you're telling me i have to ask the injector makers or figure it out myself....damn. the guy from precision went and got their data sheet on the injectors and said that they only have one value and that someone from hondata should be able to tell me the skew rate to fill in the rest of the tables.

peasly23 · Post by **peasly23** » Tue Nov 06, 2007 11:00 am

I just contacted RC Engineering myself and this is what they said.

They said that they would either need to know which injectors Hondata used to get the numbers in that table and they MIGHT be able to figure it out, or have Hondata give me the injector offset table for my 750cc injectors (part number SL4750). They said that this should be something you guys have. Speaking of which, how DID you guys come up with those numbers?

The only number he could give me was the offset at 13.5V, which was 1.4ms. He said that is the only voltage they test, and that you guys should have some sort of table.

Post by **Hondata** » Tue Nov 06, 2007 11:03 am

The table values are for stock Honda injectors.

peasly23 · Post by **peasly23** » Tue Nov 06, 2007 11:06 am

Ok thanks..

What about what they said you should have... "the injector offset table for my 750cc injectors (part number SL4750). They said that this should be something you guys have."

peasly23 · Post by **peasly23** » Tue Nov 06, 2007 11:11 am

RC just told me that based on those numbers being from the stock injectors, that he recommended I add 20% to each of those values by multiplying each of those values by 1.2 NOTE, this is for the injector part number SL4750 ONLY!!! and probably doesn't apply to any other part numbers.

jew · Post by **jew** » Tue Nov 06, 2007 4:12 pm

thanks peasly, i'm gonna try that with my 780cc injectors since they are both delphi injectors and are almost the same flow rate. precision said the only difference between their injectors and rc's is that the duration is a little shorter, hence the 1ms @ 13.6v versus 1.4ms @ 13.5v.