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| 4T80 (just kicking around a few ideas) (Page 2/2) |
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G-Man
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JAN 24, 08:53 PM
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Will/Fieroguru: Are you saying that different E67 ECMs might look for different timing of the cam and crank pulses? You would think they would all have the same relative timing and, if the cam sensor needed to be in the 3-oclock position instead of the 9 o-clock position, they would just re-clock the reluctor wheel accordingly. The ECM doesn't know that the where the crank sensor is as long as it receives the correct input its looking for. I'm guessing the Northstar (being DOHC or whatever GM calls it now) only references one of the cams or maybe the main drive gear for the timing chain?
If there are differences, how would I verify what works with what? I've been trying to find powertrain schematics for the 07 Lucerne with no luck.
Gary
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G-Man
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JAN 24, 10:22 PM
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I went on a few sites for GM parts (gmpartsdirect, gmpartsgiant, etc) and looked up the part numbers for the ECM, TCM, cam sensor and crank sensor for an 07 Lucerne (4.6L) and an 07 Impala (5.3L) and here is what I found:
Vehicle ECM TCM Cam Sensor Crank Sensor
2007 Lucerne 12678511 24252114 12601098 12580429
2007 Impala 12678511 24252114* 12580470 12560228
*The other vehicles this fits included FWD, RWD and 4WD vehicles. Are these flash-able just like the ECMs?
I expected the cam and crank sensors to be different. The ECMs are the same which is good. I did not expect the same part number to show up for the TCM. I found some notes online that talk about the E67 being developed specifically to work across carlines with different engines and different transmissions.
I really need to find some wiring diagrams and compare them.
Gary[This message has been edited by G-Man (edited 01-24-2018).]
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FieroWannaBe
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JAN 25, 09:12 AM
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| quote | Originally posted by tampalinc:
I have been digging into putting a 6-sp auto and LS in my car for a while.
6T70 M7W was matted to the 2.0L I4 LTG Turbo in the Malibu and Regal.
2.0L I4 LTG Turbo also came matted to the F40 manual.
F40 mattes to the LS4, so would the 6T70 M7W mate to the LS4?
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No, the LTG bell housing is another all new bell-housing design from GM. It looks similar to the High Feature (3.6L)
It is not the same as an Ecotec pattern either.
http://www.chevrolet.com/pe...ransmissions/ltg-fwd
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fieroguru
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JAN 25, 11:56 AM
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| quote | Originally posted by G-Man:
Will/Fieroguru: Are you saying that different E67 ECMs might look for different timing of the cam and crank pulses? You would think they would all have the same relative timing and, if the cam sensor needed to be in the 3-oclock position instead of the 9 o-clock position, they would just re-clock the reluctor wheel accordingly. The ECM doesn't know that the where the crank sensor is as long as it receives the correct input its looking for. I'm guessing the Northstar (being DOHC or whatever GM calls it now) only references one of the cams or maybe the main drive gear for the timing chain?
If there are differences, how would I verify what works with what? I've been trying to find powertrain schematics for the 07 Lucerne with no luck.
Gary |
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The LS4 has the cam sensor 180 degrees off from all other LS based engines, but uses the same cam gear (with the raised portions for the cam gear) as the other LS engines. So, yes GM has changed the locations (and more importantly the timing of cam/crankshaft signals within the ecm). The likelihood of them being the same between the N* and LS engine family is slim, but once you know what the differences are, then you can look at options for adjusting them.
The LS crankshaft reluctors are presses on, so with care and precision you can remove them and rotate them where needed.
The cam gears on the 58X LS engines are single bolt, so you can "rephase" them by drilling a new dowel pin location.
With both engines at TDC with #1 cylinder ready to fire,
You will want to know the angular position of the crankshaft sensor as well as the angular position of the missing 2 teeth on the 58x reluctor wheel. Will says the N* crankshaft sensor is in the valley = 0 degrees (roughly). The LS engines are on passenger side of the block = 270 degrees (roughly). If the reluctors on the crankshaft are rotated so both engine sensors see the missing 2 teeth at the same time during crankshaft rotation/placement vs. cylinder #1, then you should be golden for the crankshaft sensor.
I assume the N* has a 4X cam gear, which is what the 58x LS engines have. Then it is the same exercise to determine radial timing of the cam gear to the start of timing notch and the angular placement of the cam sensor.[This message has been edited by fieroguru (edited 01-25-2018).]
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