2xLS1

iTrader: (25)

I'm working on tuning a car (02 Z06 w/7# Procharger) that has been through 2 other tuners before me. My question is: Is there EVER any reason to change the Injector Offset vs Volts vs Kpa table. Someone before me has changed this table on average added + 15% to all the values, but when I set it back to the stock table settings, the car will barely run. But I'm also dealing with unknown for sure injector size and bar rating injectors and +25 LTFTs also. I'm thinking one of the previous tuners crutched this table to make the car driveable with the wrong values in the Flow Rate vs Kpa Table.

RedHardSupra

iTrader: (1)

reset your IFR to whatever injectors you have (look in the stickies for the spreadsheet) and then redo your VE, that will set all the tables to more realistic values.

Bink

Offset table (and associaoted tables) is specific for each injector type. If the procharger was supplied with the GTP (Bosch-GM) injectors then there is a specific offset table for it. GTPs flow~ 42# at 58 psi. The GTPs are white.


If you have LS1 Edit or EFILive/Flashscan I can send you a 2000 ASA Bin for these injectors. At least then you could compare the values.

jimmyblue

iTrader: (11)

Does anybody collect "known good" injector offset
values by type?

Has anyone ever seen a manufacturer-sourced
number? Or a bench method for extracting it
experimentally?

2xLS1

iTrader: (25)

The owner of the car thinks they are Rochester 50s/3 bar. I guess I should clarify the S/C system is just using the Procharger head unit with the kit by some Co in New Jersey. They supplied the injectors with their kit. The PCM was sent to them for their base tune. Then another well known tuner tuned the car and set the IFR table values 40.49 40.49 40.49 40.49 40.49 40.61 40.8 40.92 41.17 41.42 41.48 41.61 41.67 43.96 44.02 44.21 44.46 I don't know which tuner changed the Offset vs Volts table. Going by what the owner said, I set the IFR Table for 50/3 bar scaled to 4 bar. 57.73 58.1 58.47 58.78 59.15 59.53 59.84 60.21 60.58 60.89 61.26 61.57 61.94 62.25 62.56 62.94 63.25 The car has +35 STFTs and +25 LTFTs within 30 seconds of resetting them. Not knowing exactly what the first two tuners did, I just started comparing tables on the tune I started with with that of another stock 02 Z06 and noticed the difference in the Offset vs Volts Table. I've tuned other cars with bigger injectors and have never changed that table.

WS6FirebirdTA00

iTrader: (33)

i would like to know this as well. i have some 38# injectors and want to know about the offset table, but its just something i dont htink i should tinker with without some proper knowledge/info

Bink

Jimmy - the ASA engines were supplied by GM with GM-GTP injectors (42# @ 58 PSI) and GM PCMs. (I've confirmed this with wait4me) The correct tables are in the ASA files. These tables/PCMs were also used for the World Challenge Vettes.

My understanding is that the Offset tables can only be determined experimentally. And "IF" the injector construction (pintle, coil etc.) is similar to ours then our stock tables are "good enough". At least that's my take on it.
FWIW.

WS6FirebirdTA00

iTrader: (33)

well i have the racetronix and they are suppose to react faster and i think they are disk style. any ideas on waht to do about that? i am trying to see if i can get taht info from them

Redline-Motorsports

iTrader: (3)

Good topic. I have EFI Live Workshop version and have been glaring at those tables wondering what to do. I also was under the understanding that each injector has its own offset values. Where do you find them?

It would be nice to have a reference chart with some of the more common injector sizes we use that would show these values. Keep this thread going!!

Howard

Bink

RC Engineering can flow them and give you a limited offset table.
It says in their ProCal section "If the customer opts for ProCal service, his or her injectors are tested, using RC Engineering's computer-controlled equipment, over a wider range of pulse widths, usually from .5 milliseconds to continuous flow. ProCal tests injectors at pressures up to 125 psi. Additionally, if variable voltages are used, RC will test injectors at any customer- specified voltage between five and 14 volts". If they test at 58 psi you should be able to adjust your offset table with that data.
FWIW.
http://www.rceng.com/procal.htm

WS6FirebirdTA00

iTrader: (33)

hey thanks man. ill see if they have any info on these if not ill have to find time to take mine off.

Bink

You're welcome.
I saw a post where RC gave the offset for a set of injectors they sold.
I edited my last post.

Bink

Yeah. And in EFILive there is more than an offset table for the injectors.

WS6FirebirdTA00

iTrader: (33)

i sent an email, after all the grief i have got from racetronix maybe i can have them send some out for testing, doubt it but we will see

WS6FirebirdTA00

iTrader: (33)

looking at the 2000 to 2001, the offset table varys quite a bit. and that is going fomr the same brand 26.4 to 28.8. no different style 26.4 to 37.8 im sure would screw things up real nicely

WS6FirebirdTA00

iTrader: (33)

well in the past racetronix has told us he would come back with information about the injectors, since he has been claiming we all dont know what we are doing and the ifr is the only change needed when in fact it isnt. while i wait for a response to my post that is a day or so old, that im sure he has read through, i will try to come up with some more information on this stuff and post up anything i can find.

Viper

iTrader: (6)

Let's raise this again. I swapped to 42lb's in June and just adjusted IFR. Car runs fine but technically speaking what are we looking for? Will the injector react quicker? Run better at low speeds? Help with surging? Does anyone have Offset vs Volts vs KPA for Ford SVO 42lb's? Seemed a popular injector so I got them for $200 with 1000 miles on them.

WS6FirebirdTA00

iTrader: (33)

AFAIK, the offset table wont matter much, just tune the ve table and itll cover most of the slack in it. i just used an offset table in mine from a larger injected car, cant remember which, just to get it closer. but i have seen no issues, just makes the ve off slightly i think. it would be nice to have it all set right but i have found nothing. i have 42#ers running in my car now and they are great

Viper

iTrader: (6)

I just was reading your thread on hptuners from April on this issue. I'm leaving it alone. However thinking of changing the MAP boundry on the first column to be 57 as my car idles in that range.

2xLS1

iTrader: (25)

Just to update this thread, Racetronix told me the particular Rochester 50# injectors that were supplied with the SC kit and installed in this particular car are not compatable with the drivers in the LSX PCMs. We ended up changing them out with Motron 60#s and went back to the stock LS6 Offset vs Volts vs KPA table and the car tuned fine.