Whatever!!!!!!!!! Gearhead-EFI Edition

[gregs78cam]

Well I was headed camping last weekend, and was going to take the Truck with the 4wheeler in the back, so I decided to do the brakes on it. Well a simple brake job turned into replacing the rotors (pressed on the hubs), then that turned into getting a new hub because of a spun bearing race, but no one had one local, so I went to pull and save, and got two good ones with rotors from a '78. Well from the '74 to '78 they changed the inner bearing size on the Dana 44, so those wouldn't work. I ended up peening the old bore and put the new bearings in just to get by for the weekend. Put it all together and one caliper wouldn't retract completely, so another trip to town Friday (day we are leaving) to get a caliper, got it all together everything topped off, loaded, decide to take it down the road to make sure everything works right. Pull out of the driveway onto the highway and when the trans shifts to second...........nothing, then it grabs but doesn't hold well. Third seems better. But making a strange rattling sound in second and third.

Finally pulled the pan yesterday and it seems that the intermediate roller clutch has come from together. I was thinking of swapping the th350 for a th400, but I don't think I want to do that swap and then do another one when I decide to go to a 4L80E. So I think I will just rebuild the th350 again, but I am going to soften up the 1->2 shift a little, it was pretty brutal at half throttle or more. I thought I read that someone on here was a transmission guy, so here is my question.....Is there a stronger aftermarket intermediate sprag for the th350. If no suggestions I will call Jake on Monday and talk to him, that is who I got the rebuild kit from last time. http://www.jakesperformance.com/

[EagleMark]

PM droptopstang, he's the tranny guy. Or just a thread and PM him for some help, he's willing and able.

[RobertISaar]

http://www.stealth316.com/2-air-fuel-flow.htm

i get the feeling that if i were to impliment a proper speed-density calculation(as opposed to the BPC style stuff GM did for a lot of applications), that this is a great place to start.

[RobertISaar]

the forum got mentioned on 60V6 and it wasn't even me!

(well-known member on 60V6 was searching for an ADS file for $6D)




side note: link above, analyzed it and came up with this:

creating air density:
barometric pressure
airmass temperature

creating air volume:
cylinder displacement
RPM
VE
MAP

creating mass air flow:
cylinder displacement
RPM
VE
MAP
air density

creating air mass in cylinder:
cylinder displacement
VE
MAP
air density




of course, GM did all of this work already in certain masks, but i'm fairly certain i can get it done either more efficiently or without having to build a workaround later(see 8D large airflow issue that causes the injector PW to stop rising above 7mSec or whatever it is).

[Six_Shooter]

Yeah, Gearhead-efi seems to be getting mentioned more and more, on many sites. I almost think that we are starting to be considered the new version or replacement of diy_efi.org.

[gregs78cam]

I don't have the project completely lined out just yet, so I don't really want to start a thread on it, but I'm considering the feasibility of using a '7427 variant to control a 4L60E mated to an engine that redlines at 8K. How much work would be involved in expanding the trans related tables out to 8K RPM? I know it would take some time to sort through the .bin but with some of the really good hacs that we have I would think it do-able. I think that a lot of the engine code could be removed to clear up some space. I might also need to increase the bit size of the RPM to get more than the 6400 or so MAX RPM of the stock $0D. Any thoughts?

This is a rough idea of what I have in mind:
1972 Honda AN600 - stock=1260lb, target= < 2000lb
2010-2012 Kawasaki Ultra 300 Engine - 1500cc, EFI, 8.4:1 CR, 17psi Supercharged/intercooled, 300hp
4L60E with 3K stall
Narrowed 9" or 10 bolt, ~4.56 ratio.

[RobertISaar]

couple of different ways to go about it.

could interrupt the RPM calculation and create a new variable that will scale to whatever RPM you want it to(i made a 8 bit RPM byte that will read all the way up to 12,800RPM in my code, 50RPM increments) and save it to a new RAM location, then change a couple of bytes in the code per table to use this new RPM and that will solve that issue instantly. then just change the table breakpoints in the XDF and you're ready to calibrate.

that would likely be the way i would do it, since it interferes with the least amount of other items, in fact, it would only effect the ones you want it to, rather than effecting all scalars/tables.

[gregs78cam]

I like that, thanks. I am still a little confused on how things are looked up in a table. For instance, I kind of get that:

 
           ; LK UP BPW MULT vs PUMP VOLTAGE MULT
            ;
            ;-----------------------------------------
846F:            LDAA    L0055                ; BATTERY VOLTS * 10
8471:            LDX     #$4986                ; BPW MULT vs BATTERY
8474:            JSR     LF553                ; 2d LK UP

              ;
              ; Apply battery correction
              ;                                                             
8477:            LDX     #$024D             ; SYNC BPW
847A:            JSR     LF5E2              ; 8 x 16 MULT SUBROUTINE
                                            ;                  
847D:            STD     L024D                 ; SYNC BPW

has something to do with:

        ; 2D LK UP
        ;
        ;----------------------------------------------
F553:  LF553     PSHX    
F554:            PSHB    
F555:            LDAB    #16
F557:  LF557     MUL     
F558:            PSHB    
F559:            TAB     
F55A:            ABX     
F55B:            LDD     0,X
F55D:            SBA     
F55E:            PULB    
F55F:            BCC     LF567
                                                              
F561:            NEGA    
F562:            MUL     
F563:            ADCA    0,X
F565:            BRA     LF56D
                                                              
F567:  LF567     MUL     
F568:            ADCA    #$0000
F56A:            NEGA    
F56B:            ADDA    0,X
F56D:  LF56D     PULB    
F56E:            PULX    
F56F:            RTS     
        ;----------------------------------------------

But beyond that, I think I need to spend some time with the OP-Codes. I guess I will start a thread when that time comes.

[RobertISaar]

you would probably be better off not trying to understand the 2D and 3D lookups yet, they're a PITA to try and decode. do simpler stuff until you get a good feel for how the 68HC11 does it's job, then they won't be so bad. the pink book is basically a requirement for the more complex subroutines.

[EagleMark]

That is really worthy of it's own thread and you would get more response.

It sounds like a cool project and as Robert would say... "I approve this project!" Not sure I would start with a 10 bolt rear axle though... maybe as it's sounds light weight.

[gregs78cam]

TNot sure I would start with a 10 bolt rear axle though... maybe as it's sounds light weight.

Lightweight is the key here, Camaro makes 100 more hp and lots more torque, weighs almost twice what this should and the 8.5" 10 has held up fine. But I do have a 9" disc rear end waiting for a home too.

And yes, if I can ever afford the engine then yes it will definitely get its own thread.

[EagleMark]

I have to come see this project, you were talking about it last time over but hard to comprehend!

Hey is there any LS stuff at Pull and Save?

[EagleMark]

Is this thread like a blog? Cause I can install a blog... what's a blog?



Fried Cod for dinner. Wash, dry, dip in egg and flooped in corn meal with six pepper seasoning and some garlic. Fried in olive oil!

[gregs78cam]

I have to come see this project, you were talking about it last time over but hard to comprehend!

Hey is there any LS stuff at Pull and Save?

I haven't started anything yet, just making a list, and seeing if the idea is possible.

LS stuff, I'm not sure. Most '96+ stuff there might be Vortec, maybe harness, PCMs, I have yet to see to see an actual LS engine in a vehicle there.

[RobertISaar]

i have yet to see any LS engine in a yard near me.