60# Injectors Cobalt Ss

[RACELS1]

Apperantly the factory pcm limits you to 8 g/sec max. is there any way to set up 60# injectors for this or am i screwed? thanx

[TotheNthRPM]

63 is FFFFFF in hexidecimal, which i think is what our ecm is coded in........ there are ways around it tho. maf tuning etc.

[EC_Tune]

Adjust the Injector Offset table down so that the injectors play nicely.

[redhotjamedjimi]

i havent done this yet but plan on tuning with flow so that the max is only in the last column then use the volts offset for the rest of it. that way all the other tuning is accurate enough.

[potatoe]

Can you explain more about scaling the offset down. Thanks.

[potatoe]

Anyone?

[redhotjamedjimi]

(60/34)(inj constant) so increase the last column to the max 8.

Then the maximum 8 (variable in flowrate vs kpa.) over the stock variable say x so 8/x. the difference> (60/34)-(8/x)=Y gives you the percentage you add in the flow rate modifier vs. volts. 100%= 1.000

then you multiply all the variables in your table(flow rate vs kpa) you havent maxed out. (varibiable)(8/x)= final variables for table.(flowrate vs kpa.)

I'm pretty sure.

[potatoe]

"(60/34)(inj constant) so increase the last column to the max 8.

Then the maximum 8 (variable in flowrate vs kpa.) over the stock variable say x so 8/x. the difference> (60/34)-(8/x)=Y gives you the percentage you add in the flow rate modifier vs. volts. 100%= 1.000

then you multiply all the variables in your table(flow rate vs kpa) you havent maxed out. (varibiable)(8/x)= final variables for table.(flowrate vs kpa.)

I'm pretty sure."

Im still having trouble with this.... do you mean offset Vs vac or flow rate modifier? Ive given it several attempts but have not yet made a good table, i guess im confused.

[redhotjamedjimi]

flow rate vs. volts, it should range from 5 volts to 13. putting the same modifier in each column shouldnt affect anything. the last column is 13 and up which should be at all times.

I say to do it this way because people max out all the columns then wonder why there afr goes everywhere under boost. This way it is actual flow rate vs kpa. is correct.

[potatoe]

Ya thats exactly where i am.... totally crazy AFR at WOT

[redhotjamedjimi]

think of it as VE offset. to get over 100% Ve you dont max everything out. the offset just adds to everything equally.

[ssnipes]

man this is not so easy anymore, LOL, not impossible just more work. thanks for the info. wish it was clear as mud but it is not. I will look at it and comeback with questions. thanks for steering in a different direction.

Is there a sample of proper values for the injector flow rate that can be used? anyone. I will calculate it and put in my own values, but it would be helpful to ensure I am working it out correctly. thanks

[ssnipes]

(60/34)(inj constant) so increase the last column to the max 8.

Then the maximum 8 (variable in flowrate vs kpa.) over the stock variable say x so 8/x. the difference> (60/34)-(8/x)=Y gives you the percentage you add in the flow rate modifier vs. volts. 100%= 1.000

then you multiply all the variables in your table(flow rate vs kpa) you havent maxed out. (varibiable)(8/x)= final variables for table.(flowrate vs kpa.)

I'm pretty sure.

Okay, i see where your going with this but there is one other factor not calculated into this and that is fuel pressure. the stock fuel pressure is 58. my new injectors are 60lbs at 43.5 psi. I dont know what the gm injectors are. Are they 32lbs/hr at 58psi or 43.5 psi or something else?

Too hard to figure out or too much work? how about this.

I have GMS2 injector flow rate and I have what I would like to enter for the 60lbs injecters I have. how do I scale down the flow rate so it is linear to the maximum 8 g/sec allowed that will be set at 80 kpa?

thanks

Edit - I think I got it. I took (GSEC values for new injectors @ Map PSI/new Max GSec @ 80 MAP) * 8. 8 being the maximum allowable G/Sec allowed for ECM program. I think this works. I will provide spead sheet and values as a link for this at a later date. please give me feed back if you think these values will work. thanks

EDIT #2 - this is the rates for the table I came up with

60lbs with down pipe and 2.6.hpt
Injector Flow Rate vs. KPA VAC

6.110 6.175 6.239 6.314 6.377 6.439 6.501 6.572 6.6330 6.693 6.752 6.821 6.880 6.938 6.995 7.061 7.118
7.174 7.229 7.294 7.348 7.403 7.465 7.519 7.572 7.624 7.685 7.737 7.789 7.840 7.899 7.949 8.000

Now how do adjust or compensate for this table as the GSec values I would have put in if the PCM would allow it are as follows.

7.303 7.381 7.458 7.548 7.622 7.697 7.771 7.856 7.929 8.000 8.071 8.154 8.224 8.293 8.362 8.441 8.508
8.575 8.642 8.719 8.784 8.849 8.924 8.988 9.051 9.114 9.187 9.249 9.310 9.372 9.443 9.503 9.563

[redhotjamedjimi]

gm already has fuel pressure calculated thats why only the last one is maxed out so it still follows the same curve. its all relative still with bigger injectors.

[CHARGDSS]

Edit - I think I got it. I took (GSEC values for new injectors @ Map PSI/new Max GSec @ 80 MAP) * 8. 8 being the maximum allowable G/Sec allowed for ECM program. I think this works. I will provide spead sheet and values as a link for this at a later date. please give me feed back if you think these values will work. thanks

EDIT #2 - this is the rates for the table I came up with

60lbs with down pipe and 2.6.hpt
Injector Flow Rate vs. KPA VAC

6.110 6.175 6.239 6.314 6.377 6.439 6.501 6.572 6.6330 6.693 6.752 6.821 6.880 6.938 6.995 7.061 7.118
7.174 7.229 7.294 7.348 7.403 7.465 7.519 7.572 7.624 7.685 7.737 7.789 7.840 7.899 7.949 8.000

Now how do adjust or compensate for this table as the GSec values I would have put in if the PCM would allow it are as follows.

7.303 7.381 7.458 7.548 7.622 7.697 7.771 7.856 7.929 8.000 8.071 8.154 8.224 8.293 8.362 8.441 8.508
8.575 8.642 8.719 8.784 8.849 8.924 8.988 9.051 9.114 9.187 9.249 9.310 9.372 9.443 9.503 9.563

im guessing your asking how to convert from lbs/hr to gsec?

right click in any box with the lbs/hr value in it and do a unit conversion to gsec. then paste the new values

[ssnipes]

im guessing your asking how to convert from lbs/hr to gsec?

right click in any box with the lbs/hr value in it and do a unit conversion to gsec. then paste the new values

no I know how to convert. I just chose to work with metric. if you want imperial I can get that very shortly.

I am now trying to compensate for the difference - dont we need to do that? by using the offset vs volts vs map? or do I just start tuning. just trying to get the next step

[redhotjamedjimi]

for maximum hp we need the closest we can get. but higher than 15psi may affect our fuel pressure and flow anyway so its good to be damned close at that point.

[potatoe]

Put the percentage you are off in the flowrate modifier vs. volts table. That way the computer knows the exact flow.. like said earlier.

[ssnipes]

Put the percentage you are off in the flowrate modifier vs. volts table. That way the computer knows the exact flow.. like said earlier.

right I found it. Thanks I got that now. now my IDC should be corrected to.

starting to tune today. got all parts in my sig. installed yesterday...LOL

[c24s/c]

Any updates? Which values did you end up using? And by playing with the injector offset, did you end up with a nice curve then, instead of a blip and flat line?

Nate