I'm converting TBI to an Edelbrock MPFI on a 350 h.o. crate motor. I have a PP2 and WinBin. I want to be able to run the 29C256 inside the computer. So what I wondering is how to load the programs onto the chip so I can use Craigs Switcher. Am I missing Something?? I tried searching but there isn't anything about loading the files. anything you guys can help me out with would be wonderfull. Unfortunately Edelbrock doesn't have a file for the 330hp 350 HO.

Chris

 

Which switcher are you talking about? He has a few, one he discontinued, the others he has for p4 ecm's, not c3's.
What ecm are you going to be using? If a c3 let me convince you to get standard injectors and a 7730. The p4 will have faster aldl streams which will help you tune faster.
I've tuned a 1500 series chevy pickup with a zz4 and edlebrocks "mpfi" with a c3 ecm... it wasn't easy. There was WAY too much AE and I found it to be a real PITA with the slow aldl (160 baud is ~ 0.8 fps).
Rewiring for a 7730 isn't difficult since GM used all the same sensors. The knock management was wired differently (directly into the p4) but that's an easy fix that doesn't require much effert.
As far as I can tell there are very few that actually have fuel injected 330hp crate engines. I think it's because of the cost. Looking at the aftermarket you can see that the cost of EFI is almost as much as the whole motor! Hence the lack of EFI support for this motor.

 

We're looking for something a little easier since we just spent $1200 on this because of the idea that it would make the conversion easier. I was talking either about a switcher Or we're going to have to resort to a Low-profile ZIF to try and keep it inside the case. We're tring for a stock appearance even though noone will see it.

 

I still think you'll be better off going with the 7730, one of craig's adaptors, and tuning that with normal injectors. All the sensors are the same (cts, iat, map), only some wires are different. In the c3 systems the knock is controlled through an module mounted with the fuel pump and fan relays. The knock sensor goes into this filter, processed, and then that module tells the ecm if there is detonation detected. Just remove the module or remove the connector and jumper the knock sensor signal wire to the ecm wire and repin the connector for the 7730.
You will be MUCH better off with the 7730! Trust me on this. It took me a week tuning my friends zz4 with that kit and if I had the 7730 in there with normal injectors it would have taken half the time. Seriously, for port injection it's best to at LEAST start with an ecu that was coded for port injection.
This is your best bet.
If you want to keep the c3 then first things first, take the AE tables down to 20% before you run it for the first time. Then curve the VE table to peak around 4000rpm, run more timing into the stock SA tables and start tuning.

 

so how would I go modifying the harness to go with the new injectors?? I really don't want to have to pull the harness out and start re-pinning everything. We're trying to do this with a decent time frame in mind. Maybe we'll just go to a prominator set-up and then use Edelbrock's tune for a stock 350 to start.
I think that might be an easier route to go than trying to start from scratch.

 

What application is this? Is it a thirdgen, if so, what year, and if it's a truck, what year. I believe edelbrock only has a chip for the 7747 (truck) and that calibration won't work in an 8746 (thirdgen tbi).
Give me more details about the application and how comfortable you are with a multimeter.
I would get them to send you there chip that is calibrated for there vortec performer cam and performer heads. This way you can send me the file to see how far they went into the calibration to make it run correctly with a hotter setup.
I'd like to stress to you that a stock 7730 calibration with small ve tweaks and spark remap will run TONS better on even the initial startup than a "calibrated" eprom in a c3 running a MPFI system. That is still my main issue not to mention if you keep the c3 you'll most likely need to get a 350 knock sensor along with a ESC module. The 7730 ecm eliminates the need for the ESC module since it's built onto the memcal adaptor.
I believe you'll have better results if you just go with the 7730. If you are torn between what to do then go with your gut instinct because I don't know you as well as you know you.
Going to a 7730 would require minimal repinning but you will need to find one with a memcal, and connector plug. Then with some minor rewiring (not pulling and fishing wires through firewall) you can have the 7730 benifits. If you're doing this in a truck you won't have an IAT so that's 2 wires and a cheap sensor that would need to be wired into the intake and brought through the firewall.
If you're interested let me know so I can take a look at the wiring diagrams closely or I won't waste my time.

 

It's going into a 91 RS. I'm looking fo rthe most cost effective route possible. Don't have an unlimted budget unfortunately . The only reason I was thinking of the prominator is because it should plug in and I can then copy the Edelbrock chip and go on from there. Then everything is set with the edelbrock as a base and I can tune in the future easier as if it were a LS1 car. Chances are It'll get a bigger cam down the road and more head work. I think it'll be easier and more time worthy to it that way as opposed to converting to a 7730 ECM and trying to do it that route. The 350 knock module isn't the biggest concern I have, it's more of can all this be done in a timely matter and which route is cheapest.

 

It's possible that you don't have enough info to make that call, accurately. What if you have a problem with your Edelbrock?. It all goes down the drain unless, you also figure in a backup plan. The 730 idea stands to be ALOT more cost effective if you include the possilility of an ecm failure.

FWIW, it cost me $200 to get the IAC fixed in my Gen VI. I could have gotten at least 4 oem ecms for that.

 

Start a poll thread where you describe your delema and include a link to this thread.
Grumpy, I believe he's getting the vortec kit that comes with an eprom for a 7747, not a new ecm.
I really believe you'll have the best luck with the 7730 ESPECIALLY if you upgrade anything in the future. I'm near the limits of where I want to be with my current setup and it's served me well, I just think that without lockers the c3's are a PITA. Upgrading to a P4 (like the 7730) opens up a door of tuning support that you just won't find with the c3's.
Really what it comes down to is that it's far more cost effective to go to a 7730 now than it is in the future. If you aren't set on port injection and want to save your money I can tell you now that you can make power with TBI for a fraction of the cost of that edelbrock setup.

 

I wish there was a P4 Lockers.
It's just incredible really seeing what's going on.

 

It may be that the 'cost effective' constraint is due to this system not going into one of his cars, but anothers. . .

RBob.

 

RBob is correct. It is for a customers car, but We treat it as our own. This was they same thing I was looking into for my own car, but I have run out of cash. And the Chip we would be getting from edelbrock is the chip for his ECM. I'm just looking at tuning possibilites without a UV eraser, since I don't have one. I figured you guys would be the best to consult on this. If it comes down to it I can always just buy a UV eraser and do it that way, but I'm looking at his tuning possibilites in the future

 

could the 7730 be used with the edelbrock injectors or do you have to change them to get it to work