Three options to more power, help me decide....

[Fiftydriver]

kn4hey,

If I went with the LSX454 and a magnacharger, I would not need the FAST 102mm intake manifold as the SC would replace that. Maybe you ment 102mm throttle body???

Anyway, that combo would give me alot more power then I feel would be streetable on a daily basis. I may be wrong, I have never driven a car with this engine.

[Fiftydriver]

Danhr,

The GMPP web site lists the LSX454 crate motor at 620 HP and 590 ft/lbs with a stock LS3 intake and tune. The FAST intake is supposed to add around That comes out to around 500 RWHP with stock intake and tune. With my add ons and a FAST 102 intake, I figured I would easily get into the 550 RWHP range.

Certainly you can build these up to be much meaner machines but I am just quoting the stock numbers offered by GMPP.

Do you have a link to a company selling the 416 forged engines just so I can do some research on them. I am not opposed to more Cubic Inches, just want to make sure the car stays streetable in the long term as its driven alot, nearly daily.

[Fiftydriver]

Darth_emma,

I have not really considered a turbo for one reason. I have a built 2004 Duramax GMC. It is running right at 600 HP and 1000 ft/lbs of torque. Fun as hell to drive on top power setting and almost scary when launching in 4 wheel drive.

That said, I HATE the turbo lag. I have put alot of money into this truck to get rid of the turbo lag and its still there. Much better then before but its still there.

I have not driven a gas fueled car with a turbo, at least not a high performance one, maybe they have less turbo lag but I do not like it. I have driven several supercharged vettes and that is the feel I want, instant power!!

Plus, I do not belive my Roto Fab intake and Dynatech Headers would work with the Turbo system, just wasted money on those parts as I want to reuse them if I can.

[Darth_Emma]

Originally Posted by Fiftydriver

Darth_emma,

I have not really considered a turbo for one reason. I have a built 2004 Duramax GMC. It is running right at 600 HP and 1000 ft/lbs of torque. Fun as hell to drive on top power setting and almost scary when launching in 4 wheel drive.

That said, I HATE the turbo lag. I have put alot of money into this truck to get rid of the turbo lag and its still there. Much better then before but its still there.

I have not driven a gas fueled car with a turbo, at least not a high performance one, maybe they have less turbo lag but I do not like it. I have driven several supercharged vettes and that is the feel I want, instant power!!

Plus, I do not belive my Roto Fab intake and Dynatech Headers would work with the Turbo system, just wasted money on those parts as I want to reuse them if I can.

I went with a Maggie for the same reasons. I just wanted to make sure you had considered TT for the hp range you were looking at. I have just recently been through the exact same set of decisions you are trying to make (supercharger vs TT vs new motor, etc.). My car had a maggie installed in it last week. Good luck with your decisions!

[2SSRS@Gen5diy]

Originally Posted by kd4hey

You forgot:

Option 4
Pull the L99 and replace with LSX454
102mm T.B.
Magnacharger 2300 kit
Water/meth kit
Protorque 2600 torque converter
custom tune


That'll put you over the top for sure!! Go Big or Go Home isn't that what they say? (Of course this means I will just STAY home).

Keeping mine stock until the warranty runs out.

I concur with your option and add to it a custom cam and new 1000hp axles, Lets see this happen.

[robsls3]

For option 2 and 3 you will gain some cash from selling the L99.

My say is option 1. I hate to see you burn through cash doing 2, 3 ,4 and the car isnt streetable to your likings. I have done it a few times as I have seen many others and in the end either wasted cash or started a rebuild process all over again.

You may have to view or start chatting with others in that HP range on the pro's and con's of a streetable car with that HP marks.

[2010 Bumblebee]

Originally Posted by danhr

You aren't going to hit the stock bottom end limits with option one. Guy up here in Pittsburgh has all of that done on his, plus heads and a blower cam and he's doing just fine. imo, the stock bottom end limit tends to be around the 700-750 rwhp mark.

option two.... well why would you stop at 376 ci? you could get a forged 416 for the same price? Do you not want the extra cubic inches?

option three... if you are only getting 550 rwhp out of a 454 lsx, you need a new engine builder or you did a very mild build. lol. Once you hit that 4.125 bore, power numbers go through the roof.

A big question is, how long do you think you will be happy at the 550 rwhp mark? The mod bug is very addicting. The other two options give you room to grow on, the first one, not so much. If you think will be content with the 550-600 rwhp mark... I'd say go with option 1, and add a cam in there. That way you get that "mean sound" that you want from the lsx454, but keep the costs relatively down.

I say option one. Then when the L99 gets tired someday move to a 416 stroker with 9:1 or 10:1 compression, a ZR-1 cam, and 14psi of boost (just guessing).

Option one is the easiest and cheapest.

Originally Posted by Indpowr

You have way to big of a spread. What is your END goal. If you get a Magna then still not happy then move to the 454 your throwing money after money.

Do it right and do it the first time.

This is the big question, start from the top and work down or from the bottom and work up???

How easy does the LSX454 bolt in? Do all the factory accessories bolt up to the front of the motor just fine?