Those numbers seem really low for a 6.0.... even if the dyno was in AWD.

I gained ~150 rwhp on 8psi intercooled on my stock 5.3, and I think there is still alot more power left in there.

How much timing are you running? Who did the tune? and like parish8 said, were you logging on the dyno?

at 8psi, I'm at 376/400(in comparison with the mustang dyno to Dynojet) at the wheels on my 5.3, so your 6 liter should be much more IMO, being that you had 281/305 stock. I only had about 225 at the wheels with the flowmaster.... just comparing the apples and oranges.

 

Add some more timing!!!!!!!!! That is if you dont have any KR.

 

The Tune was done by Mike at www.xmsengineering.com (Xtreme Motorsports). Mike is very well known in the Corvette/LS1 arena as being one of the best Tuners. If I remember correctly, he was "stolen" from Callaway. They use LS1 Edit to Tune. Yes, he was logging and spent hours getting the Tune set. I spoke with him today about the #'s and A/F and he was a bit shocked. I'm bringing it back Monday for the better springs/pushrods and 2 more #'s of boost. He said it was not detonating at all at 9psi, but the valve float was getting iffy.

I agree. Might as well forget running this without the Meth. I guess if I run out some day I want to make sure I can still hammer it and be "safe"!

 

if you are spraying pre IAT sensor it would be prety easy to tune in some safety if you ran out of meth. you can use the IAT vs timing table to pull a plie of timing if it happens to get into high AIT's wich you would never see if you spraying meth. i dont know what that cut off would be.

that tune was done pre dyno? like on the street? did you log on the dyno? if you have a log from the dyno it would probably be easy to see the problem.

the meth numbers seem decent. considering the drive line losses you must be seeing 100hp isn't too bad and i bet you could throw more than 7psi spraying meth. typicaly you can goto 7psi with hot air and i would think at least 9psi with meth. who knows, maybe 12+psi with meth.

 

Xtreme only has a 2-wheel dyno so it was all done logging on a street Tune. They did do an IAT relocation kit of some sort so that it will read correctly. I'm not sure the specifics of exactly where it's moved to.

I didn't log on the dyno as it was at a different place just to get the hp/tq #'s. None of us were expecting the A/F to be off. Even with 7psi setting it's off. A/F was around 10.7 so there is certainly more power in it.

The reason we stopped at 7psi as the high setting is the valve float. As of Monday, I won't have to worry about that (new pushrods/springs). They were thinking 9psi would be about as high as I'd want to go. Do you think it could go higher without causing any issues with the engine??? I know the trans will blow...

 

i think 9psi is a good everyday setting. there is most likly more in it but i wouldn't risk it unless you want to drive around with a lap top for a few days to work your way up to the limit. i dont think you can find the limit of your set up in one tuning session and then just leave it there.

i was able to push my 4.8 up to 18psi but valve float limited me to 5400rpm or soo. i would think you could goto 12psi at least and still get to 6000rpm without float but i only have that one motor/experience to speak from.

 

Good info, I appreciate it! I think with the better springs I won't have the valve float problem. I think that's a good point about the 9psi setting. Should be safe without getting too crazy. I wonder what an extra 2lbs of boost will give power-wise? At 9psi there was no detonation. That makes me wonder if I should have it set higher until the point comes where there is detonation, then back the boost down a bit. What else is there to worry about assuming a safe A/F and no detonation? Pistons? Rings? Head Gasket?

 

my experinece show that if you avoid detonation COMPLETLY, you have nothing to worry about other than a tranny. i do all of my tuning based on how far i can push things before i see detonation.

if you start turning it up and get to 15psi before you see detonation then hell yeah, crank it back 2-3psi and i think you will be fine everyday.

 

Sweet, ok, I'll see what we can push it to!

Parish, how much of a power increase did you see for each pound of boost? I know it's dependant on each engine and there are variables. But can you give a rough guestimate? Or anyone else for that matter? I'm wondering how much more to expect with another 2-3lbs or so?

 

i dont remember for sure, seems like about 20hp/lb for me. for your set up i would think about 15hp/lb would be nice.