Swapping 4.2L for SS Motor! - Page 5 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Engine tuning and/or modifications

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  #41  
Old 11-26-2009, 02:08 AM
ScarabEpic22 ScarabEpic22 is offline
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Originally Posted by ontogenesis View Post
what's the deal with the pcm's? do they interact with the bcm? if not, i don't see why you couldn't swap a 6.0 pcm/harness out of a 2500 onto a SS drivetrain and reprogram the 2500 pcm's tables...
They are a wacky ordeal, GM's bastard child brewed in the depths of he|| solely because GM didnt have a PCM that could run the VVT on the exhaust cam of the I6. You can tell they werent liked because the GMT355 platform with the I4/5 motors got the P12 from the beginning and the I6 got it in 06-07.

If you have a SS drivetrain might as well use the SS wiring. If not you'll run into issues with the reluctor rings being wrong (another reason the P10 cant run anything else, it uses a 7x reluctor whereas the E40 V8s use a 24x and the E67s use a 58x). This can be overcome easily with swapping parts, but that gets expensive (but again you're doing a swap so what isnt expensive).

If you start with a donor I6 truck, Ive been thinking you might be able to swap an LS1 512kb or 1mb PCM in like the 02-04 LWB trucks with the 5.3 used. If you used a 512kb one you would also be able to run Custom Operating Systems from EFILive or HPTuners for nitrous, SD, etc. Downfall, if you want to use a Gen IV motor you have to swap some hard parts (like the crank reluctor, knock sensors, probably more) and maybe change the fuel system (depends on the donor year TB). But if this LS1 PCM swap works, swapping a Gen III small block Chevy in would be easy. Bolt it up, pick the OS you want to use (build your wiring harness around this specific OS, probably an F-body one), full flash the PCM with the appropriate cal and done. Not an SS swap, but a V8 swap and there isnt anything that says you cant use a stroker LS1, blown LQ9 (ala Silverado SS, Escalade), heck even start with the baby 4.8L and bore/stroke it for some serious power.

And yes they interact with the BCM, they affect the cluster too (but that may be through interaction with the BCM).


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Originally Posted by Dizzlenator View Post
Yea, I thought they were different Erik. Wasn't sure what the difference was, but figured there were difference, being that the HP and TQ numbers differ so much with the different vehicles. Like I said, not sure about the computers, and how they'll interact with the different components. Thanks for the info Erik!
The difference between say a 2500 HD 6.0L and the TBSS 6.0L is not simply software. Packaging, cooling system (ours blows compared to the full size), transmission, rear end size/ratio, and then the critical things like iron vs aluminum block, truck intake vs car intake (both have the truck but you can swap them with efans), compression ratio, etc all factor into the power ratings.
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  #42  
Old 11-26-2009, 01:01 PM
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  #43  
Old 12-08-2009, 12:41 PM
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so you couldn't pick up an ls3, ls controller, 4l85e, and tranny controller from gmpp and rig up the gauges to work with the outputs from the controllers?
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  #44  
Old 12-08-2009, 07:06 PM
ScarabEpic22 ScarabEpic22 is offline
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so you couldn't pick up an ls3, ls controller, 4l85e, and tranny controller from gmpp and rig up the gauges to work with the outputs from the controllers?
Maybe, but you'd lose 4WD (if you have it), have to beef the rear diff up, then you might be able to get the E67 ECM working but its doubtful. Guages and DIC are almost a dead no.

If you start with a V8 base truck, you'd be a lot better off. Even an EXT with a V8, SWB 5.3 would be a TON easier than the I6 simply due to the differences in engine harnesses.
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  #45  
Old 12-08-2009, 07:36 PM
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I think this is a brilliant idea doing this swap, although i think i'd leave it to where it still looks like a regular TB. If you do that then people might will be like oh it's just another TB then when you race em they'll be like !
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  #46  
Old 12-09-2009, 02:05 PM
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spot u 3---
Very interested in how this will all pan out, very interesting project, indeed.
Are you from Crown Point, IN?
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  #47  
Old 02-12-2010, 02:52 PM
blazinblue blazinblue is offline
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Any updates? i was thinking of getting a 4.8 or 5.3 from a truck and wiring harness. BTW the SS 6.0l LS2 is Gen IV. A 6.0 from denali,escadale,2500 truck pre 2007 are Gen III
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  #48  
Old 02-12-2010, 05:08 PM
ScarabEpic22 ScarabEpic22 is offline
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Originally Posted by blazinblue View Post
Any updates? i was thinking of getting a 4.8 or 5.3 from a truck and wiring harness. BTW the SS 6.0l LS2 is Gen IV. A 6.0 from denali,escadale,2500 truck pre 2007 are Gen III
Im curious as well, hope I didnt scare the OP off with my long-winded responses. But everyone who thinks about this should know what they're getting into, its not a simple engine swap by any means.

I really wish we could figure out if the BCM actually cares what PCM is feeding it information...as long as it gets a class 2 serial comm (GM's used the same protocol type since OBDII in '96) it should be able to interpret the signals...

Be prepared to redo a lot of that harness. I think anyone trying to do a Gen III swap should look at rewiring their harness to use a LS1 PCM, not an E40/E67 and T42. Should be easier, can leave the engine 100% stock if you so desire (no reluctor issues, etc). Plus the LS1 PCM is very powerful, especially if you throw a Custom OS at it. I can get the pinouts for the LS1 PCM used in the 03-04 LWB trucks if anyone wants it.
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  #49  
Old 02-13-2010, 12:22 PM
blazinblue blazinblue is offline
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I have the 4l60e on my 02 Trail. it should be the same as the one in the trucks, heck im even running a i-6 trailblazer stall on my 03 silverado. By getting a gen III engine with a complete harness its up to figure from the 0bII to the ls1 pcm theres no need to do a Gen IV Pcm/Tcm. After that just worry about the drivetrain axles and motor mounts.


Here is a Wikipedia on LS based Motors

http://en.wikipedia.org/wiki/GM_LS_engine
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  #50  
Old 02-14-2010, 10:57 AM
72JOSH 72JOSH is offline
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After reading through all these posts still no pics. Sack punch for you. You've got my attention on this one. Very difficult to say the least.

I think you'd be better off just putting your body on the SS frame
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