jay7199

Before I go and pay someone to tune my car, Id really like to get the hang of it myself.. how ever im pretty far away from a novice friendly setup to learn on.

I have 50-57lb injectors that should be currently at 50lbs based on the LT1 fuel pressure, LT4 hot cam, electric water pump and Vortech V-1 S-Trim supercharger on a 93 LT1.

The car was completely stock before I installed all of the mods above, I am using TunerProRT and Ostrich 2.0 for tuning with $DA2 from gearbox.

I adjusted the Injector Flow rate to be 50lbs
lowered the startup enrichment vs coolant temp values
lowered the crank fuel pulse width vs coolant temp

attempted to start it, was flooding..
lowered the values some more, still way way to much fuel.
Lowered the low rpm/load settings in VE vs RPM vs MAP

still horrible, so clearly I am missing something.

Im pretty sure its Injector PW correction vs Battery voltage, its the only Injector PW table I can find, but im not exactly clear on how to edit this table, Can someone help me out please?

RBob

iTrader: (1)

The Injector PW correction vs Battery voltage table is just what it states, it corrects for the injector offset versus battery voltage. The values for that table vary according to the injector used and the fuel pressure.

Need to get those values from the supplier of the injectors.

RBob.

jay7199

These are the injectors I have

http://www.fiveomotorsport.com/50-lb-rochester

jay7199

heres a bit more info on them..With this can anyone help me figure out what I need to input into the table?

Part Number 17104487

Static Flow Rate: 50.0 lb/hr @ 43.5PSI (300kPa) 525cc/min or 6.4gm/sec

Static Flow Rate: 57.7 lb/hr @ 58.0PSI (400kPa) 606cc/min or 7.4gm/sec

Dynamic Flow Rate: 1.1 gm/pulse - 2.5ms pulse width and 10ms repetition rate @ 43.5PSI (300KPa)

Dynamic Flow Rate: 1.3 gm/pulse - 2.5ms pulse width and 10ms repetition rate @ 58.0PSI (400KPa)

Coil Resistance: 12 Ohms / High Impedance / High-Z (No ECM driver modifications required)

Cone Spray Angle - 22.4 degrees - Single spray cone. Approximate cone angle for 90% of spray volume

Ball/Seat Design with 6-Hole Diffuser Disc

Flow tested by Delphi to 2% tolerance.

jay7199

bump, any advice :S

RBob

iTrader: (1)

None of that data will help with the injector compensation values.

As far as being too rich, I really can't help much as I am not familiar with the $DA2 code mask. One thing is, make sure that the ECM is not in limp mode. At key-on, engine-off the SES/CEL should do a quick blink-off.

If it just turns on solid the ECM isn't running from the PROM. And uses the redundant fuel device (RFD) for fueling. Which will be rich with larger injectors.

RBob.

jay7199

Thank you, I will double check that.

junkcltr

iTrader: (1)

Are you sure the XDF is correct?
Try increasing the injector constant to make the BPW smaller.
Trying reducing the crank BPWs and see if it has an effect.

What are the current report BPWs?
With 50#/hr and stock top end & cam you are close to the min BPW limit so you may end up with a rich idle because you simple can't make the injectors spray less fuel. Trying to make them spray less means 0 fuel sprayed.

jay7199

Ever since I put ostrich in the car iv been having loads of problems with getting my data logging software to work.. I use ALDLDroid.

I do have a cam, and im not sure the XDF is correct.. but I can only assume it is. It seems there are not many people who tune these corvettes unprofessionally so trying to find info/files has been kind of hard.

junkcltr

iTrader: (1)

You have a case of too many variables happening.
I have seen "emulators" not work properly, XDF files wrong, etc.
Yes, that ECM was not used in many vehicles and years.
What are your HP expectations with the SC? That ECM may have a problem with the 1bar MAP sensor.

I would start simple. Remove the emulator. Find someone to verify your XDF is correct, or install the stock injectors and vary the crank PWs and injector constant and see that the XDF is correct. Could get the tunercats definition and check against that. Would give you a starting point.

jay7199

the 1bar MAP limits me to about 13 PSI if i remember correct? Thats not a problem as I will be under 10lbs.. This current setup should be about 420 to the tires if it was tuned perfectly on a safe tune.

I will be running a few test here in a bit and report back my findings.

junkcltr

iTrader: (1)

The stock 1bar map will read up to 104.4KPA. That is about .5 PSI of boost.
Have you installed a 2bar map with the stock ECM?

I am not sure how it is going to working out with the SC, 1bar MAP.

jay7199

oh.. Looks like I need to figure out how to do a 2bar map then.

Well I do seem to have bigger problems, I went and tested the check engine line as suggested and it stays on all the time with key on engine off, but it has always done that.. I have only had the car for 2 months so I didnt realize that was abnormal, In addition to that there is a check engine light when the car is running now. I was able to get datamaster to log the car with the stock prom in it and stock injectors, its hardly idling right now.

junkcltr

iTrader: (1)

If the check engine light is one when running then it is running LIMP mode. Is the emulator still installed? Something is up with your bin and/or emulator.

If I was in your position, I would keep the stock injectors in it for now. Tune the ECM for the cam in idle and low load part throttle VE places. Do not make any sort of boost.
Then mess with the injector constant and crank PWs to see if they have an effect. If they do, then install the 50#/hr injectors and change bin to match them.
You will still have the 1bar map limit, but it should be running right out of boost at this point.

jay7199

Thanks, thats some good advice. I think the computers bad.. I have always wondered about it because it has a good size dent on it, I just took it off the car to investigate more and there is something rattling around in it as well.. that cant be good!

The car has always ran fine without problem but it never felt super powerful.. I just figured it was the stock LT1, I wonder if this computer has been bad all along.

Also the check engine light is on with the stock prom, I took the emulator off just now to test it in the stock setup. I grabbed a quick datalog and its showing a constant 300 knock count!

this is what the ECU looks like..ill upload the datalog shortly.

jay7199

ok so this is whats rattling around inside the ecu..

jay7199

OK so I found this after taking the ECU apart.



but I managed to fix it..

jay7199

After that I was able to datalog with datamaster wall running the emulator. im about to post a log of my testing tonight..

jay7199

here is a link to the datalog file.

https://www.sendspace.com/file/26nfm1

junkcltr

iTrader: (1)

I am not sure what I am looking at in the pics, but I think you found an overheated pin/trace that magically made the solder disappear. Then you re-soldered it. After soldering, your ECM would then datalog and work with the emulator. That is good progress.

Is the check engine light OFF when driving now? That is the next step. Getting the light off.

If it is off, tune VE tables for your cam in places with no boost.

Then make changes to the injector constant and see if the engine reacts.
Set it back to what it should be, then change crank PWs and see if it affects startup.
If that goes well, then install the bigger injectors and set the bin injector constant and crank PWs.

If that goes well, crank up the PE (power enrich) mode fuel multiplier to try to get fuel in for boost. Also reduce spark depending on your fuel and intake air setup. The fuel is a crutch for not have a 2bar map and 2bar ECM.

jay7199

yes that is correct, ecm seems to be doing much better now and accepting my changes from the emulator, the check engine light was from EGR delete so I just plugged the sensor back in for now and the light is gone.

I am now attempting to tune for e85 - I had a empty tank and put 3 gallons of E85 in and got the car to idle on it, it runs like **** in open loop but once it goes closed loop it does ok. Gona work on it more today!

junkcltr

iTrader: (1)

You are lucky that the pin solder was the only problem with the ECM. Usually when solder disappears like that there is a trace problem too. Either way, that is great progress.

Pick a fuel and stick with it. Look at your closed loop BLMs from the datalog and tune your VE tables. It is lean due to the cam install and even leaner due to the E85. Your stock injectors are 24 lb/hr and your engine probably wants 10-20% more fuel due to the cam and 30% due to the E85...........so install the 50#/hr with the stock tune will make it a tad rich.