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Old 12-10-2012, 06:57 AM   #1
NemesisC5
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LT1 Information

Saw this post on LS1Tech. Someone who claims to be GM employee. Read it for what it's worth.

http://ls1tech.com/forums/16937494-post314.html
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Old 12-10-2012, 07:22 AM   #2
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While some interesting infor is in there. I'm not 100% ssure I believe all of the post. For one the LNF has a VERY simular (tri lobe) fuel pump to the LT-1 there isn't a lot of "new" there. Also I think GM would be all over anyone spewing design secrets at this point.

But most of the info he does have would appear to viable.

Edit: After reading more of his posts, I'm not really sure about him anymore.
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Old 12-10-2012, 04:43 PM   #3
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not an engine tech, but I think the jist of that thread is

A) the "big gunz" guy seems to know a great great deal about engines and this one in particular, but has remarkably appalling grammar skills, which seems unlikely for a big-time mega-engineer of motors. He claims what he posts is first approved by a higher power at GM. you decide

B) he is saying that the motor will not be tunable in the way previous motors were, there is a debate about the feasibility of this, some saying "it will be cracked one day", some arguing that some chrysler motors have proven uncrackable.

C) he is also saying that the OEM electronics will support huge horsepower tunes without being hacked, because they are adaptable

D) he is suggesting that some aspects of direct injection make tuning dangerous. odd, as numerous DI Porsches, Lambos, etc are tuned. In fact I think the lp-560 can get 900hp with a 1 year warranty for $40k, which in the realm of Lambo prices isn't that bad.

It largely seems to be a thread aimed at making peace with the tuner / racer / motor builder crowds, and not as much aimed at extolling the virtues of the stock engine.

It contains more implications of a future monster-power forced induction motor.
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Old 12-11-2012, 05:49 AM   #4
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This is the second time that I have read that the motor will not be able to be tuned. This factor will weigh heavily on purchasing the next Vette. Wait and see I guess we will know soon enough.
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Old 12-11-2012, 08:06 AM   #5
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Quote:
Originally Posted by Upheval View Post
This is the second time that I have read that the motor will not be able to be tuned. This factor will weigh heavily on purchasing the next Vette. Wait and see I guess we will know soon enough.
HPtuners has the Dodge stuff cracked they just haven't done a beta release on it. it is comming though. They are also working on a smart tuning option but I'm sure it's a ways out. I would think that the new GM pcm might have a feature like that (looks at fuel trims and adjusts MAf scaling accordingly).

I would be high suprised if the PCm isn't cracked within weeks of it's release, there is simply to much money to be made in the aftermarket for it to be otherwise.

As for the fuel system stuff about being dangerous? I'm sure it's dangerous but it's not really any more dangerous than it was to begin with. We have been tuning DI on Diesels for years and they run much higher pressures.

injector timing will be the big deal on these motors. your injecting window is only about 25% of what it was on a non DI motor. So the injector timing has to be much more accurate.
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Old 12-12-2012, 03:35 PM   #6
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Quote:
Originally Posted by dreamcars99 View Post
not an engine tech, but I think the jist of that thread is

A) the "big gunz" guy seems to know a great great deal about engines and this one in particular, but has remarkably appalling grammar skills, which seems unlikely for a big-time mega-engineer of motors.
I noticed the same thing. It occurred to me that he might not be American-born, English might be his second language. The American auto industry is getting more international.
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Old 12-13-2012, 05:01 AM   #7
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Quote:
Originally Posted by Upheval View Post
This is the second time that I have read that the motor will not be able to be tuned. This factor will weigh heavily on purchasing the next Vette. Wait and see I guess we will know soon enough.
The guy in the thread, Bigg Gunz, seems to be implying that the car will self-tune.

Switch to E85, it will automatically retune itself for that. Add a CAI or headers, it will automatically retune itself. Even add a supercharger, and the factory ECM will retune itself to adapt to having the supe bolted on.

That might actually be really nice for modding...
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