I want to put LS1 in 90 and use the Ecm 7730
Can I use E-Dist and do this,I really like to be able to use the ls1
COILS.If anyone has done this or knows how I would be thankfull.

Thanks Dale

 

this is kinda a yes and no answer but you for NO

Reason being is because you are going to have to use a LS1 computer to run the motor

OR

buy some type of DFI/FAST system to run it, but you'd lose all the extra features like cruise/ac/etc

the 7730 isn't going to be able to run the LS1

 

Why not? If an aftermarket ecm can do it so can the 730. Also, GM sells the LS1 for rodders and such so I imagine some type of factory tunable ecm is recommended, maybe the 730? One way to find out is call GM. The E-dist needs a cam and crank signal to work and the LS1 has that. The only tricky thing I see is the 730 controlling timing as it uses a pick up coil and not a crank sensor, but that is probably going to be taken care of with the E-dist. I think the thing to do is contact FAST and get some more info for the E-dist. Now, if you have a 4L60-E to go with that LS1 then you will need the LS1 PCM or at least an 8051 LT1 pcm. The latter can be trouble because of the opti spark but again, that might be taken care of with the E-dist. I wish I could do more than just theorize nut that's all I got.

 

The LS1 pcms are specific to the LS1 for various reason......not going to list them all here

i've never heard of a swap where someone used a different ECM other than stock except for the holley 950 commander system for it or the FAST system WITH an E-Dis box

 

Not arguing with you or trying to solicit a response. It makes me wonder what folks use when they buy a LS1 crate motor to put in a street rod or the like.

 

My immediate reaction is that you'd need to use AT LEAST the LT1s 8051 PCM (which is vastly superior to the 7730 anyway). The 7730 only works with the standard distributor. That is why I think that you MAY make an 8051 work on the LS1. It supports SEFI (7730 doesn't, in fact they don't recognize the crank trigger), the 8051 is fairly well hacked and POSIBBLY you can make the 8051s "optispark" work for the LS1....but ultimately, I think that you may find that only an LS1 ECM really works.

The LS1 is such a different animal. Besides, it's only a matter of time until the LS1's PCM is hacked and public knowledge....it's just taking more time because it that much more complex with OBD II.

 

they already have LS1 Edit for the LS1 computers

LS1s also dont have a traditional firing order

 

I am not sure about LS1 Edit, but I know that LT1 Edit is an outrageously priced of software from a bunch of scammers that "picked" a lot of guys brains under the pretence of making it "public knowledge for DIYers", and then .... well you know the story. Besides, I prefer Source Code...you can do a LOT MORE than just modify "tables/constants".

The firing order is not a problem, you would just change the wires on a HEI distributor...it's just that there is no means to use a HEI distributor with the LS1, and the 7730 cannot support opti-spark (yet). Even if it had the "code" then you need a "driver" on the ECM to control the Opti-spark.

I have been looking at trying to graft a 8051 PCM to L98 and it's the "Opti-spark" that's the biggest hang up. Basically, you got to "rip" out the Opti-spark code and replace it with code from the SD 7730 - AUJP for an HEI.

That all said, I have a feeling some smart machinist will figure out a way to get a standard HEI distributor to work on an LS1 and then using a 7730 becomes quite feasible (though the injectors will all work in batch).

 

its not just as easy as changing the wires on the distributor for one. The cam/crank would need to be ground different also. This is possible but costs a good deal of money. I know of some racers who do it for every last hp under the rules, but it requires a special grind cam and different crank

No one should want to fit a distributor to a LS1 type motor. The LS1 type ignition (coil on/per plug) is probably the best thing in the way of ignitions right now. You would just be weakening the ignition system by going to a distributor

There is a Turbo Buick guy who is using the E-dis box on his GN and his plug gap is .105, YES .105 NO TYPO with 22lbs of boost and it JUST, JUST started to stumble. This just goes to show the type of spark a COP plug ignition can handle

 

That's the tough way. All you need is to ensure the spark and fuel are delivered to proper cylinder when needed. The injector/spark wire has no idea where it is firing...just where it is located when commanded to fire.

 

There's been an interesting thread on this at GMECM the last few days.

Kind of backwards to what you want to do, it's about using the LT1 ecm on a TPI motor. Putting the Optispark in a distributor housing.

While not eDIST, Bob Bailey at Bailey Eng., was/is/did a few kits for running LS1 coils on a Optinospark.

First LS1 Editors that were in the field that I heard of locked up the PCMs so bad they had to go n for repair.

.105" plug gap?, hey I, resemble that statement, hahhaha

 

The LS1 crate motors come with the computer.