mechanix565

hey guys ive got some bottom end questions. heres my plan
05 6.0l Iron Block Bored .030
Stock Crank Cut .010
6.125 Eagle Rods
Probe Forged Dish Pistons (for 6.125 rods)(+16.00cc)
(1.295 Compression Distance)(3.622 Stroke)
ARP Head Studs
ARP Main Bolts
Comp Turbo Cam (277/273 .614/.610 115 lsa)
Ported 317's
MLS Head Gaskets
Chromoly Pushrods
Scorpion 1.7 Roller Rockers
Comp Dual Valve Springs
SLP oil pump and timing chain
Edelbrock Victor Jr Intake w/ Elbow
90mm Throttle Body
60# Injectors
Edelbrock Fuel Rails
A1000 Fuel Pump
A1000 Fuel Pressure Regulator
Borg Warner S475 Turbo

so heres the main question. will the stock crank work with the 6.125 rods and matching pistons? What Stall Should i run to get that monster turbo to spool? Motors going in a 2 wheel drive silverado 1500. also give me your ideas on max boost w/ and w/out meth injection on 93 octane and horsepower numbers through a 4l80e i have 4.10's in the truck as of now

87silverbullet

iTrader: (11)

I don't see a problem with the rods and pistons as long as you got them for a 3.622 stroke. There is not going to be a specific stall to get to spool up and get you down the quarter. With a stall you have to find a balance between getting enough stall off the line to boost up but tighten up down the quarter to get the et and mph. I would talk to FTI or Yank or Circle D they can spec you something and work with you to get it right where you want it to be. I say around a 38-4000.

I hope you meant -16 cc pistons and not +16 cc because with + 16 cc you have 12:1 compression and that is not working with pump gas at all. With the -16 cc it comes to around 8.6: 1 which will be real good on pump. I would only run about 10-12 psi on pump and with meth you might end up maxing out the turbo depending on how much meth you spray. You might have to change those rear end gears because you don't need steep gears for a turbo setup. For example, cablebandit on here had a full weight convertible with a 4l80e and a 408, s480 turbo and he went 9.20's with 3.08 gears. 3980lb race weight.

As for your cam that is a very big cam for those heads. They don't flow too well for that size cam. They do work well though, people have made over 900 rwhp with them but that cam is big will most likely work against your setup. For example, 98z28cobrakiller has a 3800lb fbody with a 370 cu 88mm turbo, AFR 225 heads. His cam is only a single pattern 232 duration and he runs 8.90's its a Speed inc off the shelf grind. You do better under camming than over camming a turbo setup.

KCS

iTrader: (20)

The stock crank will work just fine, but I have a couple other concerns with your parts selection.

First are the Probe pistons. I've never seen this specific piston first hand, but I've seen similar "boost" pistons from Probe and the pins were inadequate for any kind of serious power. You may want to call and ask about the pins, see what wall thickness they are, and possibly upgrading to a pin more suitable for your goals.

Second, I'm hoping those duration numbers are advertised duration and not duration at .050" lift. 270 degrees of duration at .050" is probably more suitable for a 470ci Big Block rather than a 370ci turbo engine. I would look for something in the mid-low 230's, maybe high 220's, with that same LSA.

Lastly, those Scorpion rockers have a bit of a reputaion for cracking and breaking at the pushrod cup. I've seen a few break, but I wasn't involved in their installation so I don't really even know if it was Scorpions fault or not. Regardless, for what you're trying to do here you would probably be just fine with the stock rockers, assuming the valvetrain is set up correctly.

bozzhawg

I think he wrote the cam as advertised vs @.050, I bet he meant to say 227/223 .614/.610 115 which is 277/273 advertised. This cam is what Comp pushes for most turbo setups. The only problem I see with this cam would be the lift and how aggressive these lobes are for boost. Pending how much you run, I hope you have some good springs. I know from NA these lobes are pretty intense, so I could only imagine under boost, they get amplified.

Bozz

craig382ci

iTrader: (5)

His cam is the Stage 2 cam from Livernois Motersports. Here is the site http://www.livernoismotorsports.com/...t.phtml?p=1477 I have been following his biuld from day one. If you want to educate yourself, I suggest reading his build thread. A lot of good info in it, with a lot of detail.

mechanix565

ok so rather than going to that extent if i retain the stock roller rockers, go with a 224/224 cam with .580 lift and 114 lsa. with stock LQ9 rods and pistons with ARP Rod Bolts and Head Studs using the listed fuel system and an ls6 intake or maybe even truck intake can i go 10 psi? turbo will be a s475 extended tip 1.32 AR setup will consist of truck manifolds. what do you think for max boost on pump with no meth

craig382ci

iTrader: (5)

I think you read some from the first experiment stock LQ9 set up. He did that one mostly to learn about the do and don't things. Here is the one you to his current build which is Also an LQ9 block https://ls1tech.com/forums/forced-in...olds-pt88.html . But I would read all of the first LQ9 build and then the current build. I have learned a lot from them both.

craig382ci

iTrader: (5)

I am still learn here myself. I am read to order my motor. I can answer your question, but not from personal experience. Just from what I have read on here. Speaking only from reading 98cobrakiller AKA Carlos build. You can make decent power on the stock LQ9. But you don't want to push it hard. Keep in mind that he knew that he was going to blow this one up. He didn't care tho. This was for his on personal knowledge of the nature of the turbo side of forced air induction. But to have a more dependable you will want to put better parts in it. Which you will see when you read both builds.

87silverbullet

iTrader: (11)

I stand corrected, my bad.