Please show a gas engine, other than an aircraft engine or a race engine(both engines with no timing curve) with that much timing at idle.
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Please show a gas engine, other than an aircraft engine or a race engine(both engines with no timing curve) with that much timing at idle.
My ls2 runs 22* at idle. All GM 5.3 trucks run right around 20*.:thumb:
Fandango, think about the physics involved here, you'll realize a gas engine has to run a lot of timing at idle (low air density, molecules spread out, flame front travels slowly, need time for combustion to complete)
Fandango, think about the physics involved here, you'll realize a gas engine has to run a lot of timing at idle (low air density, molecules spread out, flame front travels slowly, need time for combustion to complete)
Did you ever own or use a timing light?
If not, then it makes sense why you would ask this.
My friend's twin turbo, stock bottom end ls1 runs 15* all the way across that whole map now, just to prevent detonation on pump gas for baseline tuning. And I had my 468 BBC at 38* on a timing light for dd in my 65 Malibu and went up to 42* at the strip.
great video!! Very interesting. I sure wish they had RoadRunner ECM's for LLY+ trucks...
Just a guess, but I would say bc they are the simplest of all the Duramax ECU's. After the lb7 the VVT charger was added and the complexity and speed of the ECU went up...
No its because theres simply no physical room for any extra crap in an LLY/LBZ/LMM ECM case.
I'm going out on a limb, but the costs versus tiny customer base has probably been the real reason they haven't built Road Runner setups for the other ECU's.
Originally developed by Moates for the LS1 ecm and then adapted to it's close cousin the LB7.
The Roadrunner ecm consists of an auxiliary circuit board and chip set installed onto the existing ecm circuit board.
duratothemax and PACougar have it right on both observations.
Moates has been asked many times over the years about developing new circuits for the LLY and LBZ ecms, but has shown no interest in the project based on projected sales numbers.
He still sells a "guts" kit for the LS1/LB7 which is what I use to build them.
Guy
The Roadrunner ecm consists of an auxiliary circuit board and chip set installed onto the existing ecm circuit board.
duratothemax and PACougar have it right on both observations.
Moates has been asked many times over the years about developing new circuits for the LLY and LBZ ecms, but has shown no interest in the project based on projected sales numbers.
He still sells a "guts" kit for the LS1/LB7 which is what I use to build them.
Guy
http://www.moates.net/roadrunnerdiy-guts-kit-p-118.html?cPath=100_56
That is what Guy is referring to ^^^
As you can see, its a decent sized daughter board that is definitely not going to fit inside the much more compact/sealed cases of the newer ECM's (IE, LLY/LBZ/LMM)....
That is what Guy is referring to ^^^
As you can see, its a decent sized daughter board that is definitely not going to fit inside the much more compact/sealed cases of the newer ECM's (IE, LLY/LBZ/LMM)....
And you can't exactly build a new case out on your workbench with your hands and a couple hours of time.
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