I have a 00 camaro z28 with a built auto I got it tuned the other day and put down 349.4 rwhp and 340.8 rwtq before changing the spark plugs they recommended. And I'm wanting to know if it is possible to get 400rwhp without getting heads or breaking into the motor.
Here is my current mod list
Bbk lontubes
Bbk y pipes
Borla muffler dumped
241 heads
04 gto cam
Stock intake
Eg delete
Slp lid
Stock pulleys
Stock throttle body.
Let me know I'd like to have 400+ rwhp with just Bolt ons.

 

An ls6 intake and a cam in the 230 range should get you close. Its not possible with just bolt ons.

 

Nope, not even close.

 

definately going to need a "big" cam for 400 wheel horse power. Dont think youll pass 360 with complete bolt ons

 

I know a handful of M6 cam-only LS1's that only make 385WHP. You simply cannot make that kind of power without doing "serious" mods.

 

nitrous

 

Another vote for nitrous. From what I understand you wouldn't need any tuning or anything for a 75 shot, and that would put you right over the 400 rwhp mark...all for a few hundred bucks

My buddy has a full bolt ons LS1 Camaro SS and made 350 rwhp & 360 rwtq, and recently added a 125 shot and now makes 460 rwhp & 505 rwtq. Hard to beat the bang for the buck factor when it comes to nitrous

 

have your 241 heads ported or pick up a set of 243's and have them ported and go with a healthy cam..... auto's dont make dyno power... auto's make track times!

 

Most are usually in the ball park of 370-375. Anything over 395 cam only is lucky imo.

 

Polluter cam FTW...

 

Im a Cam Only making 401rwhp. and one of my firend has Bolt On's Only on e85 tune and has 385rwhp

 

Realistically most are correct, 350rw is bout the max out of bolt on Ls autos.. Most I've seen is 365rw through a 6speed, on a realistic dyno.. I'm sure you can find candy if u look hard enough.. Put a nice converter in, 350whp will make your eyes water , if u hook it well !

 

In my last setup I had cam only 228 with boltons and a low 2800 stall and I made 399 rwhp. went 12.20's then changed to a 4k stall and went 11.90's but never had it back on the dyno to see what it picked up with the stall change.

 

Stall converters do not, add power..

 

I have similar but few more things than you listed and probably not quite but close to 400 rwhp so it's possible with great tune. I'm fast enough to run mid to high 12 at 400 or less rwhp. I achieve that with a baby hot cam and fast intake and full exhaust.

 

We've gone 11.7's @3600lbs with 347rwhp and 11.04 with 350whp @3000lbs

 

What altitude? I did this at 4500 elevation but with the air it ended up being about 7000 or so. Take me down to calli and I might be a 11.5 or so and this was with about 3400-3500 with me and 1/4 tank of gas in car.

 

Sea level baby.. No correction factors here , da usually between 800-2000ft

 

Yeah I would be quite a bit quicker as well at sea level. Nice jobs on times for power and weight. Very similar to me for now.

 

This is why dyno numbers dont mean a thing. My buddies 342rwh ls1 got out run by his brothers 290rwh ls1. Anyone saying they have a 365rwh ls1 with bolt ons is either full of it or that dyno is very very happy, in my honest opinion at least.