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SRT10KLLR
March 13th, 2008, 07:52 PM
I am changing out the injectors in my Silverado to 42lb units.What do I need to do in the tune to adjust for this? In my tune B4001 shows 25.235972 as my stock injectors. Do I just change this field to adjust the tune or is there other adjustments necessary?
hquick
March 13th, 2008, 09:53 PM
What model truck is it?
What fuel pressure?
SRT10KLLR
March 14th, 2008, 06:07 AM
It is a '03 Silverado with return style fuel system and runs about 58PSI.
hquick
March 14th, 2008, 02:14 PM
And it's manifold referenced....ie, a hose from the regulator to a point in the vac system (on the manifold)?
If so...I believe your IFR's should be set at 6.109375 across the board (straight line). Mine are 42's also.
SRT10KLLR
March 14th, 2008, 09:34 PM
Is that in metric?
hquick
March 15th, 2008, 01:09 AM
IFR table is grams per second.
SRT10KLLR
March 15th, 2008, 07:53 AM
My B4001 is in Lbs/Hour. What would the conversion be?
SRT10KLLR
March 15th, 2008, 08:10 AM
OK, I used the EFI Live's conversion table and got 48.487916lbs/hr. So I just need to change my B4001 to that number, correct?
SRT10KLLR
March 15th, 2008, 08:14 AM
I just got this from another site:

Delphi Multec II Shorty Direct-fit LS1 G.M. SUV injector 44 lb / hr.

Part Number 17113739 (OE Part # 25176061)
Direct fit for short G.M. LS1 SUV injectors
Static flow @ 37.95lb/hr @ 43.5PSI / 300KPa (4.31 g/s = 398cc/min)
Static flow @ 43.82lb/hr @ 58PSI / 400KPa (4.97 g/s = 460cc/min) *
Dynamic flow (2.0ms/10.0 ms(pulse width / rep rate)) 6.0 lb/hr @ 43.5PSI (0.748 g/s @ 300KPa)
Coil Resistance: High Impedance / High-Z (No ECM driver modifications required)
dc_justin
March 15th, 2008, 08:48 AM
I just got this from another site:

Delphi Multec II Shorty Direct-fit LS1 G.M. SUV injector 44 lb / hr.

Part Number 17113739 (OE Part # 25176061)
Direct fit for short G.M. LS1 SUV injectors
Static flow @ 37.95lb/hr @ 43.5PSI / 300KPa (4.31 g/s = 398cc/min)
Static flow @ 43.82lb/hr @ 58PSI / 400KPa (4.97 g/s = 460cc/min) *
Dynamic flow (2.0ms/10.0 ms(pulse width / rep rate)) 6.0 lb/hr @ 43.5PSI (0.748 g/s @ 300KPa)
Coil Resistance: High Impedance / High-Z (No ECM driver modifications required)

That's your value right there.

Justin
Wasted Income
March 16th, 2008, 11:11 AM
Is that all that needs to be done? Change that table? I've got some Siemens 60 lb/hrs I need to put in one of these days.
dc_justin
March 16th, 2008, 01:27 PM
Is that all that needs to be done? Change that table? I've got some Siemens 60 lb/hrs I need to put in one of these days.

Those will need changes to B3701 as well.