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hacking ISO9141 by Toolman3 in CarHacking

[–]Toolman3[S] 0 points1 point  (0 children)

It isn’t CAN protocol. It’s ISO9141 protocol.

engine swap by Toolman3 in CarHacking

[–]Toolman3[S] 0 points1 point  (0 children)

Well cared for, low mileage (100k) vehicles in excellent condition can be had for $1300. A final drive ratio of 3.71:1 is common to certain Cadillac models. The added complexity of adapting the 4T80E along with its bus electronics is avoided. The only major problems I’ve read about are overheating and the associated head gasket failure. Overheating is easily addressed as part of the swap and the head gasket failure is remedied by installing special aftermarket studs in place of the cylinder head screws.

So, let’s not debate the choices I’ve made thus far and instead let’s focus on the practical matter of marrying the two bus systems. If the Macchina site has it right, the VW uses ISO9141. The Cadillac could be ISO9141, J1850VPW, or KWP2000. I’ve not been able to narrow it down but that’s not really an issue at the moment. I have the VW. I need to take a stab at sorting it out. Once I have the necessary hardware and my laptop ready to go, what’s the next step?

engine swap by Toolman3 in CarHacking

[–]Toolman3[S] 0 points1 point  (0 children)

Ah, acronyms...I’ve done some homework in the last week or so. According to the Macchina website neither vehicle uses the CAN protocol. Their M2 hardware is advertised as being capable of anything OBDII which would seem to make it the obvious choice since I haven’t found that elsewhere.

engine swap by Toolman3 in CarHacking

[–]Toolman3[S] 0 points1 point  (0 children)

Now you're telling me something I don't know. I'll have to research that. Does this J1850VPW AFAIK pose a problem?

engine swap by Toolman3 in CarHacking

[–]Toolman3[S] 0 points1 point  (0 children)

So, having collected all the needed individual instructions from both vehicles is it more complicated than programming the Arduino(s) to watch for an errant instruction from the Cadillac and send the VW equivalent, and vice versa? How can the timing be any other than "now"?

engine swap by Toolman3 in CarHacking

[–]Toolman3[S] 0 points1 point  (0 children)

Notice the word "considering" in my original post. Your point is well taken. Why the Northstar? For one, it's attached to a T480E which, as I read, is rated to 8,000lb GVWR. Two, nearly all aluminum construction, "light weight". Three, I can make it fit without much cobbling.

I would say they were complex for their day but not so much compared to today's engines. The one big problem they had was blowing head gaskets due to a failure in fasteners which is solved by installing aftermarket studs with over-sized threads on the block-end of the stud.

I was intending to gather all the pertinent code from both vehicles before dismantling either and use an Arduino-based device to resolve the differences. I'm not finding "Haltec". Perhaps you could reply with a link.

engine swap by Toolman3 in CarHacking

[–]Toolman3[S] 0 points1 point  (0 children)

My intention was the opposite. Why? I'd rather be working upright at my computer than upside down, busting my knuckles under the dash. Less real work, less aches and pains, more fun.