85Iroc-Z

iTrader: (4)

I recently switched my car over to speed density from maf for my upcoming blower install. I have been doing ve learns to try and get it up and running again but it still feels down on power. It is a 383 tpi with 60 lb/hr injectors and I am running the 7730 ecm with the ebl p4 flash. I am very new to this as its my first time tuning a car. Here's a few things that I have noticed.
1. The entire time driving between sitting at idle, part throttle, and going wide open throttle, the injector duty cycle never goes higher than 11%. Most of the time it is around 2-5% Shouldn't it be a lot higher than that?

2. The blms at idle sit at 108 and then they will jump right to 128 after a few seconds, and then go back down to 108 again.

3 At full throttle, the tps will only get to the low to mid 90% range, never 100%.

4. When viewing the WUD, when it goes into power enrichment, the light that comes on is yellow. Should it be green like the rest?


I have the full video of the datalog too if they is a way for me to share it. Thanks for any help.
.

RBob

iTrader: (1)

There are a couple of ways to post a data log. Can zip the raw .dat file and post it. Can dump the file as a .csv and post that. Can take a screen shot of an area and post that.

Note that while data logging tapping the space bar places markers in the file. These show up in green and are searchable in the WUD.

The duty cycle will be high at WOT and higher RPM. This is where you need to keep an eye on it.

Increase this value to 1100 RPM:

BLM - Idle Cell RPM Threshold

The BLM of 108 means that the ECM is removing quite a bit of fuel. Do some VE Learns via the BLM method to get the VE tables closer to what they should be.

The reason it hits 128 from time to time is that the idle RPM is going over the BLM cell threshold. This causes the ECM to switch cells, changing the above parameter will correct that.

Make sure that the throttle blades are opening all of the way via the go-pedal. Once they do you can adjust the TPS gain via this parameter:

TPS - ADC Gain Term for TPS%

It is located in the XDF right after the SA - parameters.

We made it yellow by request of others. Makes it stand out more.

If the 60#/hr injectors are the skinny Siemens Deka I can post the injector compensation values for them. Just need to post back the base fuel pressure.

RBob.

85Iroc-Z

iTrader: (4)

They are the skinny siemens 60's. The fuel pressure is set at 43 pounds with the vacuum line to the regulator disconnected.

RBob

iTrader: (1)

Injector Data Sheet: FI114961, 61 #/hr Deka Mototron 006

Fuel Pressure: 43
Flow rate: 62.2 #/hr

Minimum PW @ 43 psi: 1.476

Offset Compensation versus Battery Voltage:
6.4 Volts: 2428 usec
8.0 Volts: 1529 usec
9.6 Volts: 1057 usec
11.2 Volts: 778 usec
12.8 Volts: 574 usec
14.4 Volts: 391 usec
15.0 Volts: 331 usec*extrapolate out to 16V +

Just zero this table:

Short PW Compensation versus Pulse Width:
0.015 msec: -79 usec
0.244 msec: -69 usec
0.488 msec: -59 usec
0.732 msec: -49 usec
0.976 msec: -39 usec
1.220 msec: -29 usec
1.460 msec: -19 usec
1.708 msec: -8 usec
1.950 msec: 0 usec
2.197 msec: 0 usec
2.440 msec: 0 usec
2.685 msec: 0 usec
2.929 msec: 0 usec
3.170 msec: 0 usec
3.410 msec: 0 usec
3.660 msec: 0 usec
3.900 msec: 0 usec

RBob.

85Iroc-Z

iTrader: (4)

Those figures don't match what I have listed for my offset vs battery voltage. I just change the values to the ones you have listed for me?

Also for the short pw compensation vs pw, just make every number a zero in the chart, or do I add in the negative numbers as well? Thanks again for any help.

RBob

iTrader: (1)

This is normal, as each injector brand and flow rate have different characteristics.

Yes, change them to the ones shown. Extend the 6.4 volt setting down to the lower voltages. Then at the 0 volt entry use the same value as the 12.8 volt value.

Then graph the table and extrapolate the 15 V value out to 16 V. And smooth in above that.

Just zero the short PW table, easy in Tuner Pro, highlight all entries then use the Fill w/Value function.

RBob.

85Iroc-Z

iTrader: (4)

Great, thanks for the help. I'll make those changes and see how it runs from there. Just cold start up is where i'm having most problems as of now.