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Post by consideriing on Dec 4, 2004 18:55:06 GMT -6
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Post by Marc on Dec 4, 2004 19:00:56 GMT -6
The Aurora & Northstar Engines use the 4T80E trans, so there would be no problem in that area. The big problem would be the computer. The one in the Aurora is programmed to work with the 4.0. I guess that it would have to be reprogrammed to work with the 4.6. _____________ GM!!! BRING BACK OLDS!!!
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Post by consideriing on Dec 4, 2004 19:02:59 GMT -6
so cant u just use the computer from the 4.6L?? if the aurora has a seperate BCM (body computer) then i dont see why that would be any problem at all.
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Post by Marc on Dec 4, 2004 19:18:36 GMT -6
The 4.6 computer could also be used. _________________ GM!!! BRING BACK OLDS!!!
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Post by stevensolds on Dec 4, 2004 19:34:19 GMT -6
one from a junkyard would probably be beat up as hell though and probably not even run. u be better off sticking with a good running, well maintained 4.0....
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Post by stevensolds on Dec 4, 2004 19:34:52 GMT -6
if you want to add power, add a performance exhaust and high flow cats..that will give you a good 5-10 at the wheels
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Post by Aurora40 on Dec 4, 2004 20:14:23 GMT -6
The big thing is that no one really knows what all you'd have to change to do it. I believe the STS's BCM communicates with the ECM as the "Northstar" in the Caddy refers to the suspension as well, which was active on the STS, but I'm speculating. And there's no telling if sensors were the same or give the same readings, if the fuel pump would cut it, etc. Would you need new wiring harnesses? Would the 4.0 ones work?
I'm quite sure it can be done, but you should plan on it taking a bit of time to work out the kinks, and a bit more money than simply the cost of the engine.
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Post by Marc on Dec 5, 2004 14:11:18 GMT -6
After having thought about this, I feel that the biggest problem that you would run into in this swap would be the PCM. The Cadillac computer has to take care of some different functions than the Aurora computer does. So I really don't know whether or not the Cadillac com- puter could be put into an Aurora for a 4.0 to 4.6 swap. Maybe the 4.0 computer could be reflashed for the 4.6. ________________ GM!!! BRING BACK OLDS!!!
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Post by kobalt on Dec 11, 2004 13:44:37 GMT -6
Im convinced the key to the 4.6 transplant is to run it off of the Aurora PCM. This eliminates all the wiring/electronics headaches. The engines are virtually identical mechanically, same firing order and compression. I honestly think that the Aurora PCM fuel/timing maps would adapt as the displacement difference is not that great. One of my freiends owns a Caprice which had a motor swap of 4.2 to 5.7 and using the original wiring harness and PCM. This was possible as aside from bore&stroke the motors were virtually identical. I also know a guy from bimmer.info forums that swapped a 3 liter to a 4 liter in his 94 530 using the original PCM. Will you make as much power with the Aurora PCM as opposed to the Caddy one? Probably not, but close to it.
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Post by Aurora40 on Dec 11, 2004 15:25:21 GMT -6
I agree with you Kobalt. And if the harnesses were the same and such, and used the same communication means, it might work pretty easily. If, say, the injectors flowed 15% more, then the Aurora maps might work just great with the same pulse widths, etc.
One issue with the classic is the rpm cutoff. The 300 hp motor makes it at about 6500 rpm (and cuts off at 6700 rpm), and the classic cuts off at about 6200 rpm. But the 275hp motor has the same cutoff as the Aurora and might be the way to go, especially on non-autobahn cars.
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Post by kobalt on Dec 11, 2004 22:46:40 GMT -6
I would say go with the 275hp northstar as well since the motor is geared more towards low end power than the 300hp version. I too agree the Aurora fuel cutoff is more suited towards the 275hp version.
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Post by majoraurora on Dec 28, 2006 21:24:46 GMT -6
Just a note, the fuel injectors are the same for the 4.0 and 4.6 Northstars. Years must be in coincidence however...
Has anyone confirmed the swap will work? use a long block and swap in our sensors, and bolt ons? Lots of those motors available...
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Post by Marc on Dec 29, 2006 18:49:02 GMT -6
As I said in this thread, as soon as someone makes up their mind that they are going to spend the time & money on doing this, it will be done.
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Post by edge350 on Dec 29, 2006 23:48:56 GMT -6
I don't think you could pick up a 4.6 for only $500 at a bone yard. Not here in the Cleveland area anyway. I've asked about 4.0's and and I haven't been able to find one for less than $1500 at a junk yard. Besides it is alot of work for to only add 50hp and 35ft-lbs of torque.
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Post by slimpee on Jan 2, 2007 14:10:16 GMT -6
exactly. the best question to ask about this is "why?" I'll all for ingenuity and doing new things but perhaps in this case it's just not worth it unless you can get a cheap engine and you have a lot of time on your hands.
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