I am not quite sure of the question, the '7747, '8063, '8746 ECMs all share the same hardware, only the firmware differs.

Once ROMLess the firmware is now all in a 128kb EPROM and can be changed at will. The ultimate code supports an IAT sensor which is blended with the CTS sensor for the PW inverse coolant term.

I mostly use the '747 as a base ECM because it is so easy to get. And cheaper then the Camaro ECMs. Grab a ECM from an Astro or full size van and the price is a liitle more then a handful of dirt.

RBob.

I think you should change that, seriously. I'd hate to see someone use the $42 mask on your code and screw up a motor.

Is $44 taken?

Seems like it'd be a fitting ID byte, in the "Go ahead punk, make my day" tradition

Yes, changing the maskID would be a good idea. I don't know if $44 has been used, or if it has it doesn't seem to be popular, so it is a possibility.

RBob.

I changed my $4D to $69. My next choice was $666 but its not an 8 bit value...

Since the the 747 has no IAT (or does it have a slot to put one in) then the ultimate code just doesn't see that value at all, and ignores it? Just having trouble understanding how the code works with an IAT, as well as without?

The '747 (maskID $42) doesn't have any code to support an IAT. The ECM hardware is there to support an IAT, just no software. So you can plug one in, it is just that the maskID $42 software won't read the ADC input that the IAT is connected to.

So, convert that ECM (or one of the others) to ROMLess, hook up the IAT, run the Ultimate TBI code, and the IAT is used.

Funny thing is, is that on the $61 maskID ('8746) the IAT is used in the fueling to en-rich the AFR whenever the engine starts to overheat. . . . Nothing more.

Not so in the ultimate TBI code. Here the IAT is used in conjunction with the CTS in order to provide the proper inverse termperature term for the PW calculation. From cold start to noraml run temperature through overheat.

One thing to remember is that the ultimate TBI code is only 30% $42 code (maybe that much. . . ). It could just have easily been developed from $61 code; with the same results. IOW: forget the fact that it was originally '747 code. Because it is no longer even close to '747 code.

RBob.

I do believe this is going to be the path alot of folks take to learn and develope source coding. It's all there all people would have to do is follow in your footsteps and they would have it.

The path is much easier when some one else forges it......You will be remembered:rockon:

That clears up my IAT question. I think it would be weel worth it to add an IAT for most of us 747 guys.

Learning is a good part of why I even want to work with the C3 ecm! I want to have a good handle on things on the stock truck before I start in on the car, then the V-8 swap into the truck.

The 747 has about 8 pins that are not used, so any Idea as to what pin the IAT would get wired into?

C12 would be my guess as that is the same pin used on the 746, unless RBob used something different....

Ahh yes, C12.

Looks like it could be tough (for an amature like me) to solder in the ribbon wire between the mother and daughter boards. Maybe not, with a good solder sucker.

Bob told me about a pretty neat trick. Use a little torch, hold the daughterboard and let the ECM dangle by the ribbon. Run the torch back and forth slowly across the solder joints on top and the ECM and ribbon cable will just fall off! Then just solder it to our new board.

Also, I looked on Ludis' site, and $44 is taken. I was thinking more like $BB (BoB!?!) which isn't taken.

So when's the rollout date?.


BTW, I have an ecm bench wired up for the 747s, so if you want to ship one for crash dummy testing, we can do that.

Yeah, throw us a bone Ken.

Not to hijack this thread but, I'm just thrilled with the Prominator, with the .bin switching option.

ie do some driving, in say .bin *0*, note what needs changed, do a new bin, and load in it .bin *1*. Go out driving and switch between 0 and 1 and see how much changed, what.

Plus with the pretty lil blue LED indicator for the switch, catchs Doc's attention, so he's not making too many strange noises, or yelling at people just walking on the sidewalk.

Yeah you have a habit of doing that don't you

I take it you got your "goodies" in the mail today. Everything working out ok for you?

As for Speedreader ETA...I've got to get a demo going for my "regular" job, which should happen sometime this week. Once I can get through that demo I'll be able to spend some time on Speedreader hardware development again. We're doing a lot of discussion in the meantime to make sure all the details are ironed out before we really get focused on finishing the hardware development. I'd say we're still a couple 'o months out....maybe just in time for the next pow-wow?

Wasn't me I tell ya!........

Yep, so far so great.
this make a change and being able to flip back and forth is just too neat.

Looks like I'm going to have to get a TBI car/truck, and play the SpeedReader game. So many ecms so little time.....

What about the green Regal? Is it available? BW

Rbob you know I am interested. I love the idea of having greater granularity in both the SA and Fuel Tables.

I have a 89 Turbo Trans AM and a coomplete turbo 3.8(87) in the garage :-)

So definitely I am interested in one, maybe two if it will work in the 148 apps

later
Jeremy

Any word on these? I am definitely interested!

Any updates Ken??

We are in the process of laying out a new PC board at the moment, then comes the programming.

I think we're shooting for having it ready by the pow-wow in Sep (if there is one).

Sorry to hyjack the post but I keep hearing about these pow wows and can never find out where and when, whos alowed to attend.

went multiport

I'm in for a 148. Is this a possiblity?

And I was just going to put a TPI setup on my Truck!!!
With the SpeedReader and hopfully with RBobs super source code (SSC (TM!)) I think that I will just have to dust off the 454 TB that I have saved.

RBob, have you removed all the EGR stuff from your code??
Any chance that we can tune to pass the tight CA smog test with a mild, well tuned motor (350, l98 heads, LT1 Cam, 454TB, CARB headers)??

Thanks and keep up the good work you all!!!
Greg

Any possible 148 news as of yet?

later
Jeremy

gregger2k: no EGR code what-so-ever. A cam will help with NOX emissions as the overlap provides an EGR.

Didn't some year LT4(?) Corvette's not have EGR?

3.8TransAM: SpeedReader won't work on a '148 ECM. The '148 has two full size boards in it. Completely different then the TBI C3 ECM's.

RBob.

I'm afraid a SpeedReader for the '7148 will be a completely different project, and will very likely be external. It will be plugged into the service port, unlike the current TBI SpeedReader. But, it should be able to provide the same functionality.

Is there any desire for the ROMless conversion on a '7148? Or just the SpeedReader functionality?

IMO just the 7148 functionality would be great. I could live without the ROMless conv.

1 vote for the '7148 SpeedReader with ROMless conversion here!


Thanks,
Eric

This thread has been strangely quiet over the last two weeks . . .

I've been following this thread since inception, hoping some where along the way my question would be answered. Just so I wouldn't have to post what some might consider a dumb question . . . so here goes

is there any reason why the SpeedReader wouldn't work with my Prominated '8746 ?

Consider me sold. I think it's just awesome we have you guys out there (you know who you are . . . ) constantly dreaming up ideas to better our f-bodys. And I like to show my support for you guys by shelling out my hard earned dough (just ask magus, mr bill, tunercat, joby, the list goes on and on and on -- hehehe)

Thanks again guys !
:yourock:

vote for 148 romless conversion here.

Was looking into that nayhow and maybe doing a 749 aka bruce style as well and have the swap and play options

later
Jeremy

The idea is that the speedreader will turn just about every c3 (747, 148, 746, etc.) into the same computer leaving you with whatever code you want to run as an option. You could run 7747 code on an 8746, etc. The problem that's been a pain with the c3's is the build on rom. 8k of rom code that was specific to that ecm and 4k of eprom that was specific to the engine/vehicle combo. It obviously got annoying so GM went to the p4's like the 7730 and 7749 that had a memcal with ALL of the code on it. Differences in the p4's were mostly internals while the 165 (maf) and a few other early p4's were bastard childs so to speak.
I'm really excited about this to try out Bob's ultimate TBI code .

Don't know how I ever missed that !

-Jon, thanks for the response. I had no idea the speedreader would be capable of so much more than just increased datalogging rates.

Hail to the makers ! :hail:

I've been spending a little time working with Mark on integrating Prominator support into TunerPro, that's why you haven't heard many updates on the SpeedReader project.

I have a handful of Prominators to get shipped over the next couple of days, then I can get back to finishing up the SpeedReader board layout.

Bill

You just think you can

The stock setup just makes modifing the code a much more difficult task then having the room for the code to jump around.

Doc's pulling out the trampoline.
Can he jump for joy?.

Almost Doc...ran out of parts on this batch, but the next batch should be ready by next week.

I completed the latest SpeedReader board layout yesterday, I should have a few boards in my hands in within the next couple of days. I will be working on SpeedReader firmware in-between building and shipping Prominators.

Keep us in the loop on the progress, I am watching this with ALOT of interest.

I need a speed reader bad, maybe I can get dialed in before winter!!

Still,

Drooling, chomping at the bit, and praying the the prom gods, for a speed-reader.

Any news???

Have you guys thought about about using a zif socket for the eprom?

Why bother, just use the speedreader with a prominator .

Well all I can say is "I'm working on it"...when I have time.

Trust me I want one just as bad as you do!

Yup, and as things like this take time you can be we all understand. It's not like we're in a rush, look at the years our cars were built!!! Another few months is nothing .