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"Downgrade" the Engine to LS3/LS7?

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Old Jan 14, 2013 | 01:29 PM
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Default "Downgrade" the Engine to LS3/LS7?

Might seem like a strange question, but here's the thought process:

1. Rumormill indicates GM has made the new ECU damn-near impossible to hack, and by extension, tune.

2. The LT1 adds a bunch of electronic "features" that increase both weight and potential maintenance requirements.

Solution:
Pull the LT1 engine and sell it ($$$$), drop in an LS3 or LS7 with basic bolt-ons to make up the lost power/torque, and an appropriate tuneable ECU.

Result:
Reduced weight, reduced complexity, similar performance, possibly small net cost (I'm assuming the LT1 will be in high demand and therefore comparatively expensive).

Requests for Information:
1. Did GM change how the engine bolts to the transmission? I'd love to keep the new 7-speed. What about engine mounts? Other engine accessories?

2. What sort of issues might affect how a C6's ECU interacts with things like the C7 digital dash, and the rest of the cars electronics in general?
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Old Jan 14, 2013 | 01:32 PM
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Or you could wait until the release the Z06?? Just seems like a lot of work for a minimal upgrade...
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Old Jan 14, 2013 | 02:04 PM
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This is just retarded.

Putting in an LS engine would require an ridiculous amount of work. Block won't likely bolt to the torque tube, direct injection fuel system is entirely different...by far, you'd lose countless systems in the process...

What is wrong with the people in this forum...jesus.

Back when OBD2 came out in 1996 people whined we wouldn't be able to tune cars (I owned a dyno tuning shop for many years). They'll figure it out...calm down....
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Old Jan 14, 2013 | 02:17 PM
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One of the worst ideas I've heard on this forum. Seriously.
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Old Jan 14, 2013 | 02:19 PM
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When Nissan came out with the GTR, "rumor had it" that it was unhackable....NOTHING is unhackable....

A guy hacked the pentagon with a cell phone....

Wait til someone hacks the flight systems of the 30k drones Obama wants flying 24/7 over our country, then uses them as guided missiles....party time...
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Old Jan 14, 2013 | 02:19 PM
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Things like this are why Chevy is trying to ween themselves from the older audience. People on here are so risk averse that its almost preventing the Corvette from moving forward with the rest of the industry.
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Old Jan 14, 2013 | 02:22 PM
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Originally Posted by Kappa
One of the worst ideas I've heard on this forum. Seriously.

just buy a different car.......
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Old Jan 14, 2013 | 02:28 PM
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Originally Posted by RC000E
When Nissan came out with the GTR, "rumor had it" that it was unhackable....NOTHING is unhackable....

A guy hacked the pentagon with a cell phone....

Wait til someone hacks the flight systems of the 30k drones Obama wants flying 24/7 over our country, then uses them as guided missiles....party time...
They already have lol. Just mimick the GPS signal it recieves and you have your own drone to play with.

http://rt.com/usa/news/texas-1000-us-government-906/
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Old Jan 14, 2013 | 02:40 PM
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And if the LT1 really is unhackable... who is going to buy the engine when you pull it?
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Old Jan 14, 2013 | 02:54 PM
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Originally Posted by arkus

just buy a different car.......
Dunno why people always resort to this response. When I mentioned doing an LS swap into a Silvia S15 or Toyota Chaser on another forum the response was "If you want LS engine just buy a Corvette..." Maybe I'm not that fond of the C6's styling and want a coupe the size of a GT86 but with twice the power, or maybe I want a reliable RWD sedan with sexy styling that weighs less than 3300 lbs while packing a V8?

Originally Posted by Kappa
Things like this are why Chevy is trying to ween themselves from the older audience. People on here are so risk averse that its almost preventing the Corvette from moving forward with the rest of the industry.
Older audience? I just turned 30...

Risk averse? I'll be leaving my cushy military career and plan to start a business about 6 months from now. Given the economic climate that's one of the riskiest endeavors you can engage in these days...

Moving the industry forward? I'm eager to get my hands on some 3D models of the C7. I want to use my knowledge of CAD software (self-taught) + 3d printing + Carbon fiber to rapid prototype and manufacture bespoke aftermarket car parts (largely as a side-hobby, that's not my business interest). As much as I love computers, I'm always looking to simplify and streamline the electronics used in vehicles, which is why I've read up heavily on ISIS Multiplexing and Nvidia's new automotive Tegra chips.


So far the only worthwhile answers anyone has given are "block won't likely bolt to the torque tube" and "the ECU WILL get cracked, just wait". Ok. That was useful. Thankyou.
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Old Jan 14, 2013 | 03:00 PM
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Well if that's the case, be my guest.

There's a lot more upside to the LT1 than downside. An engine that has taken lessons from the Gen IV engines and improved on them probably more than we will know for awhile.

I don't think people were trying to put LT1/5's from C4's in their C5's were they? Sh*t, what am I talking about, of course they were. The idea was dumb then too.
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Old Jan 14, 2013 | 03:01 PM
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Still time to get that C6 you really seem to want.
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Old Jan 14, 2013 | 03:22 PM
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why does every new car have a "hack proof" ecu? no electronic gadget is hack proof and even if they for some reason used stellar encryption and purposely tried to make it such aftermarket engine management would come in

GM makes money and followers in the aftermarket. there is no reason they wouldn't want people to mod the car
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Old Jan 14, 2013 | 03:33 PM
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not a good idea buddy! like someone stated earlier calm down, it will be hacked! the real question is how long until it is hacked? weeks? months? years?
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Old Jan 14, 2013 | 03:42 PM
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Originally Posted by Noble713
Might seem like a strange question, but here's the thought process:

1. Rumormill indicates GM has made the new ECU damn-near impossible to hack, and by extension, tune.

2. The LT1 adds a bunch of electronic "features" that increase both weight and potential maintenance requirements.

Solution:
Pull the LT1 engine and sell it ($$$$), drop in an LS3 or LS7 with basic bolt-ons to make up the lost power/torque, and an appropriate tuneable ECU.

Result:
Reduced weight, reduced complexity, similar performance, possibly small net cost (I'm assuming the LT1 will be in high demand and therefore comparatively expensive).

Requests for Information:
1. Did GM change how the engine bolts to the transmission? I'd love to keep the new 7-speed. What about engine mounts? Other engine accessories?

2. What sort of issues might affect how a C6's ECU interacts with things like the C7 digital dash, and the rest of the cars electronics in general?

I'd TOTALLY rip out that crappy LT1 and drop in a Duramax 6.6L!
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Old Jan 14, 2013 | 03:48 PM
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Originally Posted by Kappa
Things like this are why Chevy is trying to ween themselves from the older audience. People on here are so risk averse that its almost preventing the Corvette from moving forward with the rest of the industry.
You are 100% correct.
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Old Jan 14, 2013 | 05:01 PM
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Originally Posted by Noble713
Dunno why people always resort to this response. When I mentioned doing an LS swap into a Silvia S15 or Toyota Chaser on another forum the response was "If you want LS engine just buy a Corvette..." Maybe I'm not that fond of the C6's styling and want a coupe the size of a GT86 but with twice the power, or maybe I want a reliable RWD sedan with sexy styling that weighs less than 3300 lbs while packing a V8?



Older audience? I just turned 30...

Risk averse? I'll be leaving my cushy military career and plan to start a business about 6 months from now. Given the economic climate that's one of the riskiest endeavors you can engage in these days...

Moving the industry forward? I'm eager to get my hands on some 3D models of the C7. I want to use my knowledge of CAD software (self-taught) + 3d printing + Carbon fiber to rapid prototype and manufacture bespoke aftermarket car parts (largely as a side-hobby, that's not my business interest). As much as I love computers, I'm always looking to simplify and streamline the electronics used in vehicles, which is why I've read up heavily on ISIS Multiplexing and Nvidia's new automotive Tegra chips.


So far the only worthwhile answers anyone has given are "block won't likely bolt to the torque tube" and "the ECU WILL get cracked, just wait". Ok. That was useful. Thankyou.
The point of the matter is...is it possible...of course. If someone comes to my shop with a C7 and an LS7...will it leave a running car...of course. There's nothing hard about making it RUN...the issue is, getting all the systems to work together.

Sure, I can run an LS7 on ISIS on a wooden pallet, but that's not the point. The time that would be invested, in order to install an inferior powerplant, would be beyond wasteful. If you're starting a business, you may want to choose your ventures wisely.

Having been a shop for many years that installed swaps that didn't belong in certain cars, the immediate issues that come to mind are:

1. Mounts aren't going to work...forget that...need custom
2. Fuel system will need modified. Direct injection operates at pressures FAR beyond that of rail injection systems
3. The torque tube issue...need custom bellhousing
4. AC, PS, emissions systems, lines all need to be custom made
5. Biggest problem is management and system integration into the car. Like the racecars I've put LS7's in, there is no use of the EBCM, or any other module, because implanting all the necessary systems in another car would be nothing short of a nightmare. As a result there are workarounds...
6. Engine bay fitment wouldn't likely be a problem, but all these cars are going to be dry sump, therefore you may need a thin oil pan engine to fit, i.e. a dry sump type setup, which means you'd be looking at trying to convert an LSx to dry sump.

All this is speculative, having not seen or dealt with a C7, but it's likely that electronically speaking, you could have potential dash issues with certain readouts and things that are fed specific information via the pcm.

Essentially you'd take a C7, with a far more advanced engine, and slap in a dated powerplant, with far less of a usable power curve (due to vct), spend thousands upon thousands of dollars to do it, and devalue the car tremendously....

Go build a GTM or RCR SL-C, stick in your LS7, prototype all the little stuff you want, and spend 45k or so doing it (75k for SLC). Yes, they'll say less, but unless you're running a junkyard LS1 and beat bushing suspension...no.

Last edited by RC000E; Jan 14, 2013 at 05:03 PM.
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To "Downgrade" the Engine to LS3/LS7?

Old Jan 14, 2013 | 05:07 PM
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To the OP. The reason people are being so harsh with you is that by asking this question, you are exposing your lack of knowledge of the engineering that goes into making such a swap. It is like asking "can I pull the LS1 out of my 97 and put in a carb 350?" Also why pay that much for a car so you can swap something out. Just an odd question.

All the naysayers just need to relax, take a deep breath and wait to see what the package offers.
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Old Jan 14, 2013 | 05:12 PM
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If your gonna swap the lt1 then put the lt1 from the 90's...
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Old Jan 14, 2013 | 05:14 PM
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RC000E.....

You sound like a pretty smart cat.....here is a link to some of the encoding going on with the ECM.

http://ls1tech.com/forums/generation...m-block-2.html

As a mathematician that knows the ins and outs of the RSA algorithm used here, it is pretty impossible to crack, it is the same system used in internet commerce. But, like with most hacking deals with commerce someone will find a way to get inside the host computer and get the vitals.......interesting application of the best encryption methods we currently have though.

For those that are interested, the whole public private key method starts with two numbers that are 200-300 digits long, then goes from there. Ouch.

Last edited by drivestwin; Jan 14, 2013 at 05:15 PM. Reason: forgot link
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