L99 to LS3 conversion

[infernometallicSS]

Originally Posted by VALOR

So, if i'm putting in a cam anyway, should I go with the conversion kit since they have to pull the cam out anyway?

Anyone know any any good cam/conversion kits out there right now? Thanks.

Anybody with more knowledge correct me if I am wrong... Depending on the cam you are using you more than likely will have to do the LS3 conversion and DOD delete. If I remember correctly you could have piston to valve clearance issues. I would look into doing it, a plus is that you will have stronger lifters, etc.

[S3XPanther]

Originally Posted by Dalefj

As you can tell from my sig im an import owner (but i wish I had a camaro)
this being said I find it perplexing that chevy only got 426 horses out of 6.2L = 68.7 BHP/L
Whereas my older car from 1999 in v8 form is 300 bhp and 4 L =75 bhp/L

One of the ways that Toyota/Japan has managed to get more power out of smaller engines is through VVTI, VTEC, ETC. all of which make an engine more efficient and powerful...

SO WHY IS CHEVY SO FAR BEHIND THAT WHEN THEY USE THIS NEW POWER BOOSTING TECHNOLOGY THEIR ENGINES MAKE LESS POWER??? thus the need for this swap

Are you for real?

[nighttowl]

Originally Posted by racrx451

the HUGE resonator in the middle of the car might have something to do with it... Im took mine to an exhaust pro here in DM and he is going to cut that out and put an x-pipe in along with replacing the mufflers with magnaflows... should help a lot.

pull that center resonator, and your car will sound like its farting when it kicks on. you dont realize how often it kicks on.

[sasquash1984]

Hmmmmm....stock l99 weak lifters small cam weak tune and afm....conversion I have likenfelter gt11 cam ls7 lifters And heads milled. I went from 356 rwhp to 438 rwhp and the 356 was with cai, headers exhaust and gears and tune

[cmb74656]

The reason for the conversion is the questionable reliability of the AFM lifters, especially when adding HP. I'll have the conversion done if, and only if, I add a supercharger. The SC I want requires removal of the AFM solenoid plate, so why keep the lifters? And since replacing the lifters requires removal of the heads, I might as well swap the cam, as well.
IMO, pulling the engine and placing it on an engine stand would be preferable to reaching over the fenders over and over again to do all of this work. Less chance of scratching the paint or wrenching my back.

[kuvo]

I'm kind of a noob when it comes to these things. But When changing from l99 to ls3, how do you deal with the transmission ? I mean l99 is auto and ls3 manual, so do you add a cluth and change the gearbox when converting or what ?

[sasquash1984]

No the tranny stays the same it's just the engine internals change, when u buy a auto or stick vette u get ls3 both ways not a Eco engine, same thing with zl1 and v6 camaro only the ss engine varies on either the auto tranny or stick to bypass gas guzzler tax

[kuvo]

Interesting... so how much would the conversion cost ? cause some said 2k others 5k
Is the AFM such a problem ? I mean it sounds good saving some fuel when you dont want to ride it hard, and when you do want to turn it loose, you have the power to do so. Why is it so unwanted ?

[nak3dsnake]

Originally Posted by Dalefj

As you can tell from my sig im an import owner (but i wish I had a camaro)
this being said I find it perplexing that chevy only got 426 horses out of 6.2L = 68.7 BHP/L
Whereas my older car from 1999 in v8 form is 300 bhp and 4 L =75 bhp/L

One of the ways that Toyota/Japan has managed to get more power out of smaller engines is through VVTI, VTEC, ETC. all of which make an engine more efficient and powerful...

SO WHY IS CHEVY SO FAR BEHIND THAT WHEN THEY USE THIS NEW POWER BOOSTING TECHNOLOGY THEIR ENGINES MAKE LESS POWER??? thus the need for this swap

Lol bro. First VVT on these V8s are only on the exhaust side, its not true VVT and wont be until the next generation of V8's. My LLT makes 312 hp with TRUE VVT, thats 45HP more than the LY7 without VVT. So please, do explain how behind GM is. Second, GM has to give a good balance of power and fuel economy. Sure they could build it to get 500+ horsepower, but you'd probably get 10mpg on a good day. The engines power is also limited by the AFM components, which aren't really designed for performance. Third, big bore equals better breathing for the engine. Which means more power down low instead of higher up in the power band. The L99 makes 300 ft/lbs. of torque at 1krpms and pulls to 410ft/lbs at 4300. I doubt your little 4.0L's torque cure even comes close to the L99. Peak HP and HP per liter doesn't mean jack. Its when you get that power and much of it you get at a given rpm. This shows how little you know about engines despite what you think you do.

[nak3dsnake]

Originally Posted by kuvo

Interesting... so how much would the conversion cost ? cause some said 2k others 5k
Is the AFM such a problem ? I mean it sounds good saving some fuel when you dont want to ride it hard, and when you do want to turn it loose, you have the power to do so. Why is it so unwanted ?

Because if you want to make serious power its not something you want to have. First off the lifters would need to be upgraded, there not made for big cams or big horsepower. VVT also takes more time to tune, its easier to just delete it than trying to tune a cam to run with VVT.

[sasquash1984]

$5,200

[1BADLS3]

Originally Posted by Dalefj

As you can tell from my sig im an import owner (but i wish I had a camaro)
this being said I find it perplexing that chevy only got 426 horses out of 6.2L = 68.7 BHP/L
Whereas my older car from 1999 in v8 form is 300 bhp and 4 L =75 bhp/L

One of the ways that Toyota/Japan has managed to get more power out of smaller engines is through VVTI, VTEC, ETC. all of which make an engine more efficient and powerful...

SO WHY IS CHEVY SO FAR BEHIND THAT WHEN THEY USE THIS NEW POWER BOOSTING TECHNOLOGY THEIR ENGINES MAKE LESS POWER??? thus the need for this swap

Does it matter what Toyota does when GM can still kick its ass using traditional engine technology?

I can't remember the last time Toyota offered a ~430hp engine in a car that cost $30k. Put that in your Camry and smoke it.

And, btw, the L99 and LS3 don't share as many parts as you think. Similar, but not the same.

...Double the cylinders, half the number of valves, four times as fun, and a fraction of the cost of your beloved imports...

[kuvo]

So instead of getting a conversion like that, wouldnt it be cheaper to get a manual and change the transmission to an auto for those who want auto ? Instead of changing so many parts in the engine to convert from l99 to ls3, why not buy manual and change tranny ?
Dont bash, i'm just asking.

[1BADLS3]

Originally Posted by kuvo

So instead of getting a conversion like that, wouldnt it be cheaper to get a manual and change the transmission to an auto for those who want auto ? Instead of changing so many parts in the engine to convert from l99 to ls3, why not buy manual and change tranny ?
Dont bash, i'm just asking.

I think all said and done, being a "new" model vehicle, it's probably just easier and cheaper to trade for the car that has the stock setup that the buyer really wants.