Modified Vehicles

Injector calibration

For a method to calibrate injectors: http://m44.wikia.com/wiki/Tuning_the_Injector_constant_and_dead_times

Calibrating for injectors requires setting the 'Injection Basic Adjustment Factor' and the 'Injector Opening Time by Voltage'.

The formula for the 'basic adjustment factor' is:

(Old injector size)/(New injector size)*(the current adjustment factor).

This formula is only an approximation and will need some fine tuning.

Adjustment factors for known flow rates:

Injector	Pressure	Flow Rate	Basic Adjustment Factor	Constant for Consumption Display
Bosch Orange	3bar	315cc	1.000	5.51
Bosch Blue	3bar	347cc	.906	6.07
Bosch Green	3bar	413cc	0.7656250	7.199520
Bosch 750cc (ev14)	3bar	750cc	.3907 or .3985	13.13
Bosch/Red	3bar	1000cc	.3047	17.5

Voltage Correction Tables

In order for the injectors to work correctly the  'Injector Opening Time by Voltage' must be set correctly. These values can usually be obtained from the manufacturer. Here are a few samples for common injectors:

Orange

Voltage	Opening Time
5.00	2.632
5.99	2.632
6.97	2.632
8.03	2.398
9.02	1.853
10.00	1.443
10.99	1.170
11.48	1.111
11.97	1.014
12.47	0.936
13.03	0.858
13.52	0.819
14.02	0.760
14.51	0.722
15.00	0.683
15.99	0.605

Blue/White

Voltage	Opening Time
5.00	4.973
5.99	4.407
6.97	3.257
8.03	2.379
9.02	1.989
10.00	1.677
10.99	1.404
11.48	1.307
11.97	1.209
12.47	1.131
13.03	1.053
13.52	0.995
14.02	0.936
14.51	0.858
15.00	0.799
15.99	0.702

Green

(Important: in this example Basic Adjustment is set to .7188)

Voltage	Opening Time
5.00	5.8177
5.99	5.1556
6.97	3.6624
8.03	2.1693
9.02	1.7676
10.00	1.3659
10.99	1.1322
11.48	1.0412
11.97	0.9502
12.47	0.8815
13.03	0.8127
13.52	0.7528
14.02	0.6928
14.51	0.6437
15.00	0.5946
15.99	0.5224

Bosch 750cc

Voltage	Opening Time
5.00	3.1395
5.99	2.8470
6.97	2.5545
8.03	2.2425
9.02	1.9500
10.00	1.6575
10.99	1.5210
11.48	1.4430
11.97	1.3650
12.47	1.3065
13.03	1.2285
13.52	1.1700
14.02	1.1115
14.51	1.0920
15.00	1.0725
15.99	1.0335

MAF Upgrades

Original Text

The stock MAF can only measure flow up to 826Kg/h, this limit can be reached on a stock 850 with a 15g fairly easily. In order to maintain accurate fueling calculations past this rather low limit it is recommended to upgrade the size of the MAF by placing the stock sensor in a larger housing. Here are a couple of housings that are a direct fit for the original MAF sensor:

• 2.75" ID S90/960 Volvo Part#9146483 Bosch 0280217511
• 3.25" ID 540i BMW Part#13621702078 Bosch 0280217800

It is very important the increase in airflow is accounted for in your bin!

Accounting for the increase

The ECU uses a lookup table to correlate MAF output voltage to airmass. There is actually a linear relationship between the diameter of the housing and flow rate. This means we can multiply each cell in our MAF table by a single factor to account for the difference in flow provided by the larger MAF housing. However, this table is not available for editing directly in TunerPro. The solution:

MAF Table Editor

available here (alternate mirror1)

MAF 4.4 Table Editor

==== Instructions: ====

1. Open your Bin
2. Select all of the Air Mass Values in the table
3. Change the Function to: Multiply
4. Type in the desired correction factor (see below)
5. Click Execute to apply the factor
6. Save your modified Bin and flash your new Bin!

The factors needed:

Inner Diameter	Originally equipped	Multiplier	Max Airflow
2.5"	Volvo 850/S/V/C70	Stock	826 kg/h
2.75"	Volvo S90/960	1.34	1107 kg/h
3.25"	BMW E39	1.94	1612 kg/h
3.5"	BMW 3,5,7 series	2.24	1850 kg/h
3.75"	citation needed	2.57	2123 kg/h

(you may need to use a comma instead of a decimal as a separator depending on your regional settings)

Alternative Mafconverter: here

(for simply changing your MAF table into a Standard 2.5" ID, 2.75" ID, 3.25"ID or 3.75" ID table at the push of a button)