So I went for a dyno tune last night. Made 450hp and 460lbs to the wheels when we were finally done. My tuner isn't confident with the timing so I was given the task of find true TDC and then return to the dyno. At one point the car made 480hp and 530lbs. we are unsure what has caused the drop. So what I am asking is with my setup are the numbers I have are what is expected?

04 Ls6 block fresh rebuild
ASP 25% UD pulley
Texas Speed PRC 2.5 5.3L heads 64cc I believe with all the up graded goodies and milled for high compression
Torquer V3 111lsa
Ls6 Intake
Ported stock TB
Holley EFI HP standalone
42lbs injectors
Custom High compression Diamond racing pistons (slight over bore and fly cut)
eagle h-beam rods
Arp rod bolts, head studs and main studs
SIKKY long tube headers with two 3 inch straight pipes
LS7 lifters
Upgraded comp cam truneion bearings
Hardened push rods

I may have forgotten a few things. Also I upgraded to a Melling high volume/high pressure pump and the gauge reads 65 at hot idle and has climbed over 100psi when WOT around 6000rpm. Is this something to be worried about?? I am running a 20w-50 Brad Penn oil

sorry it may sounds like a bunch of questions but I am trying to get it all figured out.

Thanks

 

Sounds like a whacked dyno. No way you're hitting 530 with a 346. 460 is not out of the realm of possible, but your HP number would have to be 510+ for that to hold. And that's really not going to happen either. I'd expect 450/410-420 out of that combo on a dynojet.

 

I agree....those numbers are way off. I'd be a little leary of even bringing my car back there.

I made ~420 / 380 on a Mustang dyno with those mods and ls6 heads.

 

Wait so your car made 480/530 and then he tuned it back down to 450/460 and the kid has no idea why?

Is this an auto?

5.3 PRC heads milled and they're at 64cc?

 

530ft-lbs with a 346ci LS6 isn't right, even 460ft-lbs is high. Can you post the graphs from each?

Also, what are you talking about by "finding true TDC"?

I wouldn't worry too much about the oil pressure except it sounds like the clearances are kind of tight. A M10296 pump with the red spring usually doesn't make that high of pressure unless the clearances are on the tight side. Then again, I've never run 20w-50 in an engine either. Maybe try a lower viscosity oil.

 

back your oil down to 10w30 atleast.

 

Yea, that's way off! With that set-up, I wouldn't expect you to hit any more than 420hp/380ftlbs to the wheels with that combo. You really don't have anything spectacular as far as mods. A 346ci is not going to make the massive torque either....

 

Its a 6 speed. It is kind of hard to explain. I will post the graphs

 

what are you running for a computer and your sig says 40 tq?

 

I made 450/400 with the PRC LS6 heads, FAST intake/TB, and a 228R cam. There's no way your making more than I am.

 

My oil pressure was abnormally high. Turns out one cam bearing was installed improperly by the machine shop, blocking the oiling hole. Walked the cam bearing right into the path of a lifter. No damage other than trashing rod and main bearings, but still a PITA to tear down and put back together.

 

I installed a FAST 92/92 and 1 7/8" headers to get my current numbers. Not sure what you mean by what computer I'm running.

 

sorry, I meant what are you using to tune the car. Stock PCM or standalone?

 

Hopefully that's not the case. I have spoken with a few other guys who have the same pump and they get the same readings. I guess I'm dropping the weight down.

 

10W30 Valvoline VR1 should work out fine.

 

Stock PCM with HP tuners

 

yea drop your oil down! 5w or 10w-30

 

An engine dyno maybe. One of the highest torque output from a 346 was from Brian Tooley that did right around 440ft lbs at the tire on two different dyno's in a Z06. That's stupid torque.

OP I would be looking more towards your dyno operator/tuner.