anyone have a stock tune for an 1987 vette with 4+3 speed handy? I believe this is the one:

ABTC 87 vette 5.7TPI 4+3 speed

and if you have the latest $32B XDF file, I think the one I'm usin gmight be out of date ;-(

thanks!
Mike B

 

oh, and does anyone know what has to be tuned out for an AIR pump and allt he junk along with it is removed? I dont' see a direct entry in tables or flags for it in tunerpro

 

Surprisingly there were 10 bins for 1987 4+3 cars. Which OD ratio do you have? What are you trying to accomplish? AIR has no impact other than adding an offset to the O2 thresholds with minor influence during closed loop control.

 

so I got a tune from a reputable source for my engine with my mods on it. Part of the questions at the time was about removing emissions equip and all that (I no longer legally need any emissions items here in mass, YAY!) However, at that time I wasn't going to remove the air pump, but now I decided to. I wanted to add the air delete to this tune. I have a burner already, so I picked up a couple chips and figured I'd learn about OBD1 chip tunes for my 87 :-) While I was at it I figured I could compare the tune he gave me, to the base tune to see what else was done that I wouldn't touch, such as fuel mapping and all that... more so out of curiosity though really.
I was thinking there might be some other things in there that I could change too?

What is the latest XDF file too? I'm using $32B, but I have a feeling there is a newer more complete version?

thanks!
Mike B

 

oops, I never answered your question. I'll have to check my RPO codes for the OD ratio. it's a Z52 if that helps?
found it, I'm RPO G44 with a 3.07 rear end gear ratio.

 

Look for MH5 or MK2.

Prog ID BCC Size Year Release Date Eprom ECM Prom ID Scan ID Platform Engine Disp. Trans Trans Type Gear Ratio

HCY1987 31418 16059536 1227165 9539 1571 YB L98 5.7 MK2 MAN G44
HCZ1987 31418 16064421 1227165 4423 1581 YB L98 5.7 MH5 MAN G44
HDC1987 31418 16064433 1227165 4435 1611 YB L98 5.7 MH5 MAN G44
HDD1987 31418 16064437 1227165 4439 1621 YB L98 5.7 MK2 MAN G44
HDK1987 31418 16064459 1227165 4461 1661 YB L98 5.7 MK2 MAN G44
ABTH1987 31574 16070333 1227165 336 7781 YB L98 5.7 MH5 MAN G44
ABTJ1987 31574 16070323 1227165 326 7791 YB L98 5.7 MK2 MAN G44
32 ABTB 16.00 KB 1987 31576 16070312 1227165 315 7741 YB L98 5.7 MK2 MAN G44
32 ABTC 16.00 KB 1987 31576 16070318 1227165 321 7751 YB L98 5.7 MH5 MAN G44
32 ABTM 16.00 KB 1987 31576 16070328 1227165 331 7821 YB L98 5.7 MK2 MAN G44

Regarding AIR, the only parameters that have any functional impact are shown below:

LC566 FCB 12 ; Diff Value to Make up Rich/Lean Window for Fast O2.(VDC * 226)
LC567 FCB 23 ; Diff Value to Make up Rich/Lean Window for Fast O2 When Air diverted.(VDC * 226)

To be honest even I have left these alone. With no AIR, I'm inclined to think that the car will behave as if air is diverted all the time (no air either to ports or to cat). I will look into the math and try to determine appropriate settings.

Thinking of something like this, but not quite sure if they should be added together instead (12 + 23 = 35?):

LC566 FCB 23 ; Diff Value to Make up Rich/Lean Window for Fast O2.(VDC * 226)
LC567 FCB 0 ; Diff Value to Make up Rich/Lean Window for Fast O2 When Air diverted.(VDC * 226)

Or simply divert air all the time by setting this to an impossibly high value (like 255):
LC311: FCB 73 ; If Cool T < 14c, (58.5f) then divert