injector flow rate - cant enter needed values.

[ssnipes]

I am getting a tune ready for 60lbs injectors. to start I want to change the injector flow rate table. easy enough I thought. just put in the values once calculated.

as I enter the values I was surprised to find the following. I cant enter a value greater than 8.000 Grams/sec or 63.493 lbs/hr.

Why is this happening. I tried to look around the editor to allow larger values. I also search the forum for the same problem.

if it matters I have the following.

LSJ 2.0L stock injectors 32lbs, currently with GMS2 45lbs injectors, now putting in 60lbs/hr @ 43.5 lbs fuel pressure.

the LSJ fuel rail is 58psi so the flow rate is greater than 60lbs/hr.

thanks for your help in advance!

[Bill@HPTuners]

its a limit of the pcm not a bug.

[ssnipes]

hmmm.... then what values are people putting in to program for 60lbs injectors? more research. LOL

[ssnipes]

Alrighty definitely not a bug. how do we work around it. I am new to working with VCM HPT and new to tuning (no really I am..LOL). I have mechanical auto diesel certificate (not a licenced mechanic) so I know something about cars and am coachable...LOL

here is what I am doing. Getting the car ready for 60lbs injectors and currently setting up my tune. IE - bigger injectors, delete rear 02, stuff like that. so he is my next hurtle I need help with.

I have calculated the G/Sec I wanted in the injector flow rate table. problem encountered was the the PCM table has a max value of 8 that you can put in so I recalculate the table of what I wanted and put in values based on 8 being the max. this is what I came up with.

New values for flowrate rate table for 60lbs/rated with 43.5 fuel PSI

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

New values that can be put into table with 8 being max value.

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

just kept it linear.

now how do I compensate for the difference? Injector offset (offset vs. volts vs. map)?
or do I do anything? that would not seem right to me....but

[Julex]

MAF table. Adjust the MAF table to think there is more air. More air = more Fuel

[ssnipes]

MAF table. Adjust the MAF table to think there is more air. More air = more Fuel

How do you approach this. MAF to afr% error?
Why not just do it through VE table to get AFR as close to 14.7?

[bullygoat]

Found this post while searching for somethine else. Did you ever figure this out?

Tim