p600b with front mount intercooler, CCXE224/236 cam, hooker longtubes, forged wiseco pistons + normal boltons

 

stock heads?

 

Dude, you might be misunderstanding him. 12.2 is pretty quick, but not if you have a turbo charged V8 engine. Especially one that runs low 13s to begin with.

- Z28WannaB

 

Hmm, this got me to thinking. I have new wires and TR6 plugs gapped to .035. But, I wonder if the somewhat undersized 60-1 is the culprit. If that is choking at the boost level, than it could be causing the valve float, right?

Z28wannaB, I know that the 12.2 is not a great time for a turbo car. But it seems that the kit gets bashed, when in reality it has more to do with the rest of the car, and the driver. This is the fastest car I've ever owned, and I'm still learning. But no matter what the situation, "STS sucks more".

 

Honestly, on our cars, I wouldn't go below a T67. Seriously. That's probably why your power curve is like it is..if not, then something else is wrong or your muffler after the turbo is really restrictive.

So let me ask you this..if both valves are seated up against the top of the head before the compression stroke begins, ...how do they all of a sudden "float"....this I have to hear..... Like I said, I ran 7-8# and never had a problem with '"float".

 

DarkblueTA, I don't have a muffler. The STS design eliminates the muffler. I don't fully understand your question though. Even though you didn't see any valve float, that doesn't mean that it's not a possibility. If the 60-1 is choking at higher rpm's, it could cause the valve to float. The exhaust is gonna find a way out. Does this not make sense?? Your s/c setup doesn't put a restriction on the exhaust system which is why it didn't happen to you.

 

all the way down to the stock stamped rockers.

My next setup should be ready in about a month is going to have a fully forged bottom end with AFR190s, D1 with a lot more boost. My luck it will be slower.

 

The rear end will finally give out with your luck.

 

Shoot, that rear end is going to last forever. hehe

I had a hell of a time with valve float on my car. I dont know his complete setup or cam hes running but I wouldnt rule it out. But then again just about every STS dyno graph that ive ever seen all started falling off around 5000rpms.

 

At the rate you're going it will.

Did Sharmand tell you about the award he got at G9?

 

I had a hell of a time with valve float on my car. I dont know his complete setup or cam hes running but I wouldnt rule it out. But then again just about every STS dyno graph that ive ever seen all started falling off around 5000rpms.[/QUOTE]

The internals on my car are still stock. Haven't even pulled a valve cover yet.

 

Here is some info for you though, from someone else in Colorado. His dyno numbers are corrected as well, so uncorrected he has about ~400rwhp. And he ran 12.5@108..... Well, there is a guy with an 03 Cobra, and he makes 400rwhp uncorrected as well (about 500 corrected). He runs 11.9x@115-116 at Bandimere with that power level, and that's a heavier car than an F body as well. That is his UNCORRECTED time by the way. I've seen some Vortec LS1 cars run at Bandimere. The ones with stock motors and 8-10psi boost seem to all run over 110mph traps.

 

60-1 turbo seems a bit too small for any 350 LT1/346 LS1 I think that wants to make serious power.

However, if the turbo was the restriction after 5k RPM that would mean that the turbo would hit stall speed, the engine starts struggling and the compressor can't push any more air so the engine is struggling to pull the air.

Now, think about it, that all makes sense except there is one problem, if that were the case after 5k RPM you would see your boost guage go down, because any of those symptoms mentioned above (turbo too smal) would mean that the turbo can't keep up, which would mean the boost falls off, and if its too small that means you go into vacume where the turbo become an air restriction.

If you still have boost when the power falls off, then its something else wrong, get better valve springs/cam.

 

Unless the exhaust housing is too small.