LLY: Limits of the LLY

[ChevyTruck]

What's the max I can push my LLY with out going into the danger zone? I'm thinking about doing a set of twins in the future but I want to know can I do it with out killing my engine.

ALL opinions, facts, past experiences are welcome.

 

[PureHybrid]

How long do you want it to last? Mine has 187k on the ticker, Im sure twins would help by keeping things cooler if the fueling is kept in the 'safe' zone.

 

[adeso]

These are production engines-no 2 are the same. you can't say just b/c one engine did it that you can. More air seems to be the safer way to go, and smart tuning. Seems like the stock engines that live the longest have a small twin turbo, slightly oversized sticks and stock CP3. I think the key is to detune everything, so you are not pushing the limit of anyone component (so small twins so you have lots of extra air BUT you don't use it, oversized sticks running a shorter PW so you could do more fuel but don't) Smart tuning is key. But it is hard to not keep turning it up when you have the fuel/air available, and that’s when it goes boom. How you drive it affects it too. You can’t go max effort with a trailer behind you etc

 

[TheBac]

Stay around 500rwhp. Much more than that and engine life expectancy is hugely reduced, NO MATTER how you produce the power.

 

[ecc_33]

Stay around 500rwhp. Much more than that and engine life expectancy is hugely reduced, NO MATTER how you produce the power.

Yep, anything over 500rwhp and you start pushing the limits of a lb7,lly. Im not saying that its going to blow up in one day of 500 hp but thats were it starts.

 

[05smoker]

Yep, anything over 500rwhp and you start pushing the limits of a lb7,lly. Im not saying that its going to blow up in one day of 500 hp but thats were it starts.

Weren't your rods in spec still?

:spit:

 

[ChevyTruck]

What is the "weak link" in the LLY's?

 

[adeso]

HG/Rods

 

[adeso]

Unless you hydro lock it HG are the cheap link

 

[FrankenMax]

Don't push 70 + psi like I did she will go bang.

 

[smkndmax05]

These are production engines-no 2 are the same. you can't say just b/c one engine did it that you can. More air seems to be the safer way to go, and smart tuning. Seems like the stock engines that live the longest have a small twin turbo, slightly oversized sticks and stock CP3. I think the key is to detune everything, so you are not pushing the limit of anyone component (so small twins so you have lots of extra air BUT you don't use it, oversized sticks running a shorter PW so you could do more fuel but don't) Smart tuning is key. But it is hard to not keep turning it up when you have the fuel/air available, and that’s when it goes boom. How you drive it affects it too. You can’t go max effort with a trailer behind you etc

X2. Mine race tune is 650 and is still living but I drive daily on a 480ish tune.

 

[wrcknkrw]

Twins are great. More power and lower egts. Just have to drive on a smaller tune and not beat it up.

 

[wilsonck]

I just had to put a new engine in mine because I lost compression in #2. It had 180,000 km and had started with a diablo tune at 20,000km. Then a PPE at 80,000, then efi. I don't really know why it went, I was just pulling the camping trailer on a small tune and egt's never went over 1400 at all. Never been to the track and only dyno'd one time (450/960 on the big tune before the turbo was added).

But somewhere along the way, I guess it got a little stressed.