Building an LT5 engine harness from scratch. Any advice?

[shanker]

I chose an Autronic SM4 programmable ECU for my LT5 powered '62 corvette build. I purchased all new delco connectors for the injectors and all sensors.
My engine is a '92 and I have the factory GM service manual as a guide, but I'd like some more detailed wiring information for the connectors. I can't go by the factory wire colors, so I need detailed labels for each pin on each connector. Is there another book I can purchase? I've seen an LT5 engine controlled with this ECU so I know it's been done.

I may be in over my head on this one! Let me know your thoughts.

Thanks in advance.
~Brett

[HAWAIIZR-1]

It looks like a very nice project you have there and well done; always nice to hear when the LT5 is being represented.

You mentioned factory service manual and wondering if you also meant the Electrical Diagnosis Service Manual Supplement for your model year?

Another good source of electronic engine management is "How to understand, service, and modify Corvette (1982 throught 2001) Fuel Injection and Electronic Engine Management by Charles D. Probst" He also includes LT5 schematics in the book.

Kurt White from White Racing Products was kind enough to share this site for cross reference to GM connectors if this helps:

http://www.acdelcotechconnect.com/pi...s/gm/pigtails/

Aloha,

Craig

[shanker]

Thanks for the advice. I do have the supplement for the LT5 engine, and I'll pick up that other book.

From my research, it seems that the ignition coil packs fire two plugs at once. For example the number 1 and 6 cylinders share a coil pack; the no. 1 cylinder fires at 6 degrees BTDC compression, while the no. 6 cylinder is at the same spot in the exhaust stroke. Would both plugs actually spark at the same time?

[tccrab]

Originally Posted by shanker

Thanks for the advice. I do have the supplement for the LT5 engine, and I'll pick up that other book.

From my research, it seems that the ignition coil packs fire two plugs at once. For example the number 1 and 6 cylinders share a coil pack; the no. 1 cylinder fires at 6 degrees BTDC compression, while the no. 6 cylinder is at the same spot in the exhaust stroke. Would both plugs actually spark at the same time?

It's called a "Wasted Spark Ignition System".
Here's a link or two:
http://www.gill.co.uk/products/digit...wast_spark.asp
http://en.wikipedia.org/wiki/Wasted_spark

[-=Jeff=-]

If your New ECM will support the LS1 type CnP Coil on Plug, I would do that..

[phrogs]

I saw a build where someone put a LT5 in a 50s chevy and they had left out a few components and had to wire them in.

Not sure if he used an after market ECM or a stock one.
So I have no clue what you can get away with.

colors aside wouldn't the wiring tell you what you had to wire up no matter what?

I hate messing with wiring unless its plug and play I just have a hard time keeping the SMOKE in the wires.

[shanker]

I think I'll stick with the factory LT5 coil packs. they are in a hidden location and should be easy to wire.
I've received some ouside help with the wiring diagrams and I should be all set. I'll post pictures of my progress!

Thanks,

[phrogs]

do you have the secondary injector modules?

[shanker]

Yes I do. I won't be needing it though.

[ZZZZZR1]

Great pictures of that LT5!

I have a good friend who is installing an LT5 in a 1935 chevy.

I will forward this link to him.




David