Accert ECM programming

V8Lenny · May 30, 2009

Jas said: ↑

Hey tony,

Cracking the flash file so to speak must be possible but its way beond my ability for sure, guess thats why we pay so much to those who can. Now that PDI and Bully Dog can do it others will follow and eventually the price will come down. Think about what it cost to have an LS1 edited when they first were cracked, now you can buy mail order tunes for $300 on ebay.
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In Europe it's usually between 800-1200 euros and it has been going on for at least 15 years. It usually takes about 3 months after new engine is released.

C16KIWI · May 30, 2009

Jas said: ↑

Complicated topic this one....Mr Haney is right, it takes more than one part to add relaible horsepower. I would think you could possibly make 1000hp with those injectors, Acerts run multiple injections over something like 60 degrees of crankshaft duration so the injector has to flow a fair bit in the time its on to counter the time its off for in that 60 degrees, in theory if you turn the injector on for the whole time you should get a lot more fuel.

On the topic of duration vs timing, there is always more than one way skin a cat, so to speak. Horsepower (actually torque) is a direct result of average pressure above the piston on the power stoke (that would be net pressure when you take into account the opposing force/pressure from the compresion stroke). So the question is how do you get the highest average pressure and still hold the engine togeather? (Bosch has some great books on this topic by the way). We can do two things to increase this pressure;
1- increase the injection duration, ie turn the injectors on for longer, this holds combustion pressure in the cylinder for more crankshaft degrees as the piston travels down the bore. This does not increase peak cylinder pressure as peak cyinder pressure occurs near TDC. The limitation to this are because as the piston travels down the bore pressure drops off so quickly there gets a point were sufficent combustion pressure and heat no longer exist to burn the fuel and all you are doing is washing the bores with diesel (one of the reasons you hear horror stories about boxes). This is the method all boxes, including edited ECMs use (I'm not talking timing yet).
2- increase the amount of fuel delivered in the same amount of time. This is your bigger injectors and steep ramp cams. this method doesn't add fuel late in the stroke so you do not get the bore washing but to increase average pressure in the same amount of time means raising the peak cylinder pressure. Increasing peak pressure will ususally improve fuel economy due to some complicated thermodynamic but V8Lenny sums it up good with less duration is less time for the heat to escape into the cooling system improving efficiency. The down side is the higher peak pressure puts extra strain on everything but in particular (on a cat at least) head gaskets and big end bearings.
Timing is tied into both of these, if the factory was not bound by emmission laws there would be no real need to mess with the timing except on highly modified engines. I cant remember exactly but I think the ideal time for peak pressure is 5 degrees after TDC for maximum power and efficiency. Adding bigger injectors or cam puts more fuel in before TDC which bring peak pressure sooner, it now seems modded ECMs can do this also. Also modifying timing alone should gain horsepower as if you inject the same amount of fuel but increase efficiency horsepower will rise (to a point)
Now which is best? Really either method has its drawbacks and advantages but a combination of the two appears most successful. Also one builds off the other, If you increase the amount of fuel per degree of revolution (method 2) the pressures are higher so it takes more degrees of revolution before the presusre and heat drops off to the point were combustion cannot take place therefore you can add fuel for longer (method 1).
Of course all of this assumes you are getting enough air in the engine to burn the fuel you add. More fuel without enough air is nothing but black smoke and no extra power no matter how you add it.

Just my thoughts out loud, I'm a mechanic not and engineer after all
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Great read Jas,just trying to get my head around it.
So when I was running the big injectors but only using about 38-40psi boost my EGTs were well down 850*F instead of 1200*F.
The way I understand it is because more fuel went in earlier and burnt better making more HP......Right????
Also with only 40psi boost my peak cylinder pressure wouldn't be to bad???
The thing is to keep it there and fight the urge to take it to 50psi

black_dog106 · May 30, 2009

830hp C16 said: ↑

Great read Jas,just trying to get my head around it.
So when I was running the big injectors but only using about 38-40psi boost my EGTs were well down 850*F instead of 1200*F.
The way I understand it is because more fuel went in earlier and burnt better making more HP......Right????
Also with only 40psi boost my peak cylinder pressure wouldn't be to bad???
The thing is to keep it there and fight the urge to take it to 50psi
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fight the urge to take it to 50psi

C16KIWI · May 30, 2009

Use the force Luke.........

Powder Joints · May 30, 2009

jhart59 said: ↑

Who out there does ECM programming on MXS Accerts
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Probably your shop. Your a company driver right. Just pull it into the service bay.

jhart59 · May 30, 2009

Powder Joints said: ↑

Probably your shop. Your a company driver right. Just pull it into the service bay.
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Nope not a company driver. o/o for 10 years

Markvfl · Jun 11, 2009

Been busy and haven't been here in a while. I spoke with PDI this week about an ECM for my BXS. They have a 725HP program that they say will give me 4 to 6 tenths increase in mileage for $1900 exchange. It surprises me some guys say that a part that will pay for itself is expensive. And - what price can you put on that much FUN!?!? As soon as I can afford it, I'm ordering mine!

Bullhauler · Jun 12, 2009

I would like to do a PDI ecm for maybe 650hp or so, my concern is how much will this shorten engine life???

Jas · Jun 13, 2009

More horsepower = less engine life, how you treat the engine will determine how much less.

black_dog106 · Jun 13, 2009

Jas said: ↑

More horsepower = less engine life, how you treat the engine will determine how much less.
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Exactly right.

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