DIY PROMDo It Yourself PROM chip burning help. No PROM begging. No PROMs for sale. No commercial exchange. Not a referral service.
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The vortec V6's actually made around 210 HP stock. Keep in mind that they also used the CPI injectors, which on these PCMs had a different firing rate than the TBI injectors, which fired one injector per intake cycle. I'd have to do some research to remember the details, but the injector constant there probably isn't indicative of what the true flowrate is due to the way the fuel calcs are set up. IIRC, the poppets flowed something like 19 PPH each, with a single low Z TBI type injector valve at the center controlling the flow of fuel to the poppets.
I've spent the last 3 days tuning a TPI system on a TBI Caprice 350 using the 16197427 PCM. The injector constants worked out like this. I have 19# 305 TPI injectors running at 52 PSI. They measured 20.8 #/hr so this works out. So with four 20.8 #/hr injectors per bank the injector constant that worked was 41.6 #/hr. You take the four injectors per bank which is 83.2 #/hr. Then divide by 2 due to the DRP scaling constant. That leaves 41.6 #/hr per bank. I have also verified this on a 6 cylinder MPFI and here is what worked. Say you have six 24#/hr injectors. That's 72 #/hr per bank divided by 1.5 DRP scaling factor for a 48#/hr injector constant. On a 4 cylinder MPFI the DRP scaling factor is 1 so you take the actual injector flow rate times two for a per bank injector constant. Anyone have any experience to dispute this?
You might want to just jumper across the sense resistors directly with a wire. Each sense resistor is actually the ground path for the injectors. In saturated mode, there can be several amps of current on each driver for the duration of the injector firings. This may cause the contacts in the PC board jumpers to heat up. If the resistance is high enough, it may also cause the injector drivers to switch from saturated mode back to holding mode because the drivers will 'see' a large current. You want the wires used to jumper the resistors to have a low resistance so the drivers remain in saturated mode.
I can't really help with a 7747- 8625 pinout as I made a 6026-8625 harness.
I just had the 2 pinout drawings in front of me and worked it out as i went, its that simple...
The other thing you must do is remove/bypass the ESC module by jumpering the sensor direct to the ecm. Also needed is a 3.9k resistor from ground to the KS input, or a later type KS.
The other issue is the VSS. All i did here was change the 'pulses per revolution of tailshaft' parameter in the EPROM from 40 to 2 and it works perfectly. Diacom matches what my speedometer says.
If someone wants me to draw up a 7747 - 8625 conversion pinout listing I can do that.
Here is the link to the $E6 (16168625) hac.
I have created a good .ecu file for tunerpro, but i just need to add the transmission stuff before I make it public
Ben.
Hi I am new in tuning, I starting to convert to the 16168625 pcm and have find the hack but don't understand what to change and where to get the 2pulse in the bin
; LAG FILTER CONSTANTS ; L5A0F: FCB 64 ; 87 msec, RPM filter L5A10: FCB 252 ; 6 msec, Input SPD FILTER L5A11 FCB 252 ; 6 msec, XMISH INPUT SPD FILTER L5A12: FCB 1 ; 20 msec MAX PERIOD BETWEEN XISH OUTPUT PULSES L5A13: FDB 43691 ; 40 PULSES/REV OUTPUT SHAFT SPD ; 1092.3 usec/bit
L5A15 FCB 252 ; 6 msec, Xmish output spd filt
when i read this it must be in 5A13 and when i open the hex editer in tunerpro rt and i go to 5A13 then is ther standing AA what do i need to change to get 2 pulse
sorry for my limited knowledge, I hope sombody can get me in the right direction
;
;~~~~~~~~~~~~~~~~~~~~~~~~~
;-Transmission/VSS params
;~~~~~~~~~~~~~~~~~~~~~~~~~
;
L5D0F FCB 64 ;Filter coeff. for engine RPM x 8
L5D10 FCB 252 ;Filter coeff. for Trans Input Speed RPMs
L5D11 FCB 252 ;Filter coeff. for transmission input speed
;
L5D12 FCB 1 ;20 msec max time to wait for TOS signal before signal
;considered no longer present
;
L5D13 FDB 43946 ;Constant for TOS RPM calc, val = (# pulses/rev) x 65536 / 60
;
L5D15 FCB 252 ;Transmission output speed filter coeff.
;
L5D16 FDB 44564 ;2.72:1, 4WD low reduction ratio
;
L5D18 FDB 45773 ;Value for converting TOS RPMs to MPH
;
; 8 x num. gear ratio x 12 x 5280
; Value = ------------------------------------- x 65536
; 512 x 60 x tire rad in in. x 2 x pi
;
;
L5D1A FCB 252 ;Filter coeff. for MPH
L5D13 and L5D18 are the values to change. L5D13 should be changed to 2 pulses/rev in your tuning def. L5D18 may also need to be changed depending on your vehicle configuration. The calculated MPH are dependant on the tire size and rear end numerical gear ratio. If these are not defined in the tuning definition, you can use the formulas to calculate the raw values, or add them in.
;
;~~~~~~~~~~~~~~~~~~~~~~~~~
;-Transmission/VSS params
;~~~~~~~~~~~~~~~~~~~~~~~~~
;
L5D0F FCB 64 ;Filter coeff. for engine RPM x 8
L5D10 FCB 252 ;Filter coeff. for Trans Input Speed RPMs
L5D11 FCB 252 ;Filter coeff. for transmission input speed
;
L5D12 FCB 1 ;20 msec max time to wait for TOS signal before signal
;considered no longer present
;
L5D13 FDB 43946 ;Constant for TOS RPM calc, val = (# pulses/rev) x 65536 / 60
;
L5D15 FCB 252 ;Transmission output speed filter coeff.
;
L5D16 FDB 44564 ;2.72:1, 4WD low reduction ratio
;
L5D18 FDB 45773 ;Value for converting TOS RPMs to MPH
;
; 8 x num. gear ratio x 12 x 5280
; Value = ------------------------------------- x 65536
; 512 x 60 x tire rad in in. x 2 x pi
;
;
L5D1A FCB 252 ;Filter coeff. for MPH
L5D13 and L5D18 are the values to change. L5D13 should be changed to 2 pulses/rev in your tuning def. L5D18 may also need to be changed depending on your vehicle configuration. The calculated MPH are dependant on the tire size and rear end numerical gear ratio. If these are not defined in the tuning definition, you can use the formulas to calculate the raw values, or add them in.
thanks for your time, only i am a little confused i have a e6 hack and it is adressing som different like yours!
;
; LAG FILTER CONSTANTS
;
L5A0F: FCB 64 ; 87 msec, RPM filter
L5A10: FCB 252 ; 6 msec, Input SPD FILTER
L5A11 FCB 252 ; 6 msec, XMISH INPUT SPD FILTER
L5A12: FCB 1 ; 20 msec MAX PERIOD BETWEEN XISH OUTPUT PULSES
L5A13: FDB 43691 ; 40 PULSES/REV OUTPUT SHAFT SPD
; 1092.3 usec/bit
L5A15 FCB 252 ; 6 msec, Xmish output spd filt
;
; GEAR RATIO'S
;
L5A16: FDB 44564 ; 2.72:1 4WD LO RATIO
; VAL = RATIO * 16,384
L5A18: FCB 45773 ; 44.7:1 NO/VS RATIO <------------****
; VAL = RATIO * 1024
L5A1A: FCB 252 ; 6 msec, Vss filter
***************************************************
And i try to get up my knowledge. I seek further and find on the tunerpro site from Mark Mansur the ''understanding hex'' and ''the basic of creating an ecu file'' Now i can read that stuff first before i come again with questions that ask for some thousend time's
I have only at this time one more question, are we looking on diffrent hack's becouse we have diffrent adresses for same things.
sorry for late replay, but we have some different time in the Netherlands
I think i make it, I take the 1092.3 and multiply it by 2 that give me 2184 decimal. then i convert it to hex that gives me 888 after the calculation i open L5A13 there was standing AAAB for the 40 pulse (43691) and i change it to 0888 for the (2184) wath is 2 pulse. My car is not running yet. I am now working on the pcm swap so I can't test drive yet. but for the Master, do you think I do it right???
i have a e6 hack and it is adressing som different like yours!
