Hey guys I recently got a 1999 c5 ls1 6 speed im needing advice for mods.. The only thing done to it is slp loudmouth Exhuast and it came with a body kit.. My goals are 550-600 rwhp what is the max people have seen all motor and if that number is out of question all motor I do plan on a sc in the future thanks!

 

Anything over 450rwhp is pretty ambitious for an LS1. An A&A or ECS kit with 8-12lbs of boost will you get you in the 550-640rwhp range with supporting mods. You aren't likely to get anywhere near those numbers on a stock cube LS1 N/A. Congrats on the new car.

 

a stock cube n/a ls1 will not hit that number, probably more like 470-480 max effort, but a base a&a kit with headers will be a piece of cake and you can always go up in power in the future if you wish to... with an n/a setup you're pretty much stuck with what you end up with

 

Thanks I thought about going with high compression hic with fbo and e85 swap have you heard any results with that set up being close too 500 rwhp

 

Like said above, a max effort build N/A will be a little over 450rwhp. I've seen cars hit 500rwhp, but they had hugely aggressive cams. I don't think that's something you'd want to drive around on the street.

A car with 450rwhp is respectable and fast, even today...even more so in a Corvette. If you are dead set on big power (550+), the supercharger is the best way to go.

What do you actually plan to do with the car? If you are just going to be on the street, or any form of drag racing, then I'd go with a supercharger. If you want to do road racing/HDPE's, I'd stay all motor. You don't want to deal with the heat and problems of a supercharged car on a track for 20-30min.

 

I'd save and go f/I from the start. You will make good power and be happy instead of trying to do something else at the beginning and then changing it up down the line. Money better spent from the start.

 

Putting a SC on an old LS1 is a waste of resources. Sell it and Look for a late model LS, folks are listing them in the sales area all the time.

 

Why is it a waste of resources? LS1 Corvettes are significantly cheaper than newer Corvettes. Aftermarket mods kill any resell value to begin with so why start with something that already costs more? Wouldn't the route the OP is taking make more financial sense than what you are recommending?

 

not necessarily... some of them last a good while, and worst case you can have fun with it until it lets go and then worry about another motor, in most cases the supercharger is fine and you can just swap everything over to the new motor

 

N/A can have high 470rwhp but the torque isn't anywhere near that.

My 1st bit of advice is if you plan to get a blower anyway, save the money and go straight for that.
My 2nd bit of advice is to troll the parts section here daily as you can save big $ on a lot of your purchases.
My 3rd bit of advice is to simply change the cam and some headers and try to be happy. Draw the line somewhere is what I'm saying. I've had several LSx cars that started with bolt-ons, then internal mods, then forced induction and it never ended as drivetrain and eveything else needed support. Then I never had traction. Cars were faster and more enjoyable in some ways just having a strong heads/cam. Never fully happy. Being older now I wouldn't do the same thing, I'd get realistic and find out what you truly want, is it cam sound, is it 7-8psi of boost, and get to a point and then maintain the car.

 

I'm in the same boat...stock 98 and wanting to go with a A&A,but not sure where I should start.. I hate the feeling of the clutch and shifter...so I thought about that....but it's getting to be winter and I need a list of stuff to do lol

 

If those are your HP goals, then forced induction is the only way to go.

 

LS1 of that age will never be worth more than they are today. Pull and sell,
Do the obvious visual, dip stick check for water or agents, obvious sound checks, Oil pressure check 20-40 psi it's ok, compression check 140-160 it's ok anything outside 20 psi or below 20 psi on oil, it's unsuitable for for SC use, vacuum check of 17-22" is suitable, leak down check with a reading beyond 25% it's unsuitable for SC use, timing chain with 3% or more unsuitable for use, cylinder balance check if any cylinder drops idle it's unsuitable for SC use. Radiator.... air bubbles forget it! Now anything of the forgoing does not mean it can't continue or function as a DD. But the owner would get the most from it if sold as a whole, NOT a bunch of used LS1 motor parts. As stated, replace it.

Buy a crate motor, plenty of them are cheap with 500hp+ on the market place right now. Does anyone of sober mind they will be cheaper next year or the year after. I've seen plenty of these crate motors with SC here this year for sale after the owner decided to trade in the vette or realized the mods were did make a suitable street car. Frankly I'd drop in a GM connect and cruise LS9 @ 640 HP not bother with all the SC hassles. But, then again there are many, many who can only learn thru burning up the credit card or burning thru their savings.

 

Depending on what you mean by "body kit", that might be the first "de-mod" that you need to do. Let's see pics.


Shakey