BMF_Racing

iTrader: (6)

I'm building a 6-bolt Lsx 403 with an 88mm for now (up to a 101-106mm later) and will run on Alky w/ no intercooler. Below are the basic components that I have in mind on ordering.

Forged crank, rods, pistons. (10.4 cr)
PRC Ls3 aftermarket 255cc 6-bolt heads
Victor ls3 intake with elbow
235lb Moran injectors (w/appropriate fuel sys)
28" tires, 3.25 gears, th400, 4200 to 4400 stall. (3800lbs race weight)


My goals are in the 950 to 1150 whp area for now but want to leave room in the setup to go higher Hp with a bigger turbo (pt4788 currently) down the road. I do not want to spin the engine much 6700 to 6900rpm. I'm just having fun, not chasing anyone in certain classes so the lower rpms should help extend life.

The biggest thing that is far away from previous builds is this one being Turbo & Alky. Any help or direction to the right cam guy is appreciated as I know there are a few Turbo Alky guys on here. Thank you in advance.

BMF_Racing

iTrader: (6)

just as a reference I received the below suggestion from someone already. Would also like everyone suggestions/opinions.

hyd roller 238/238 .621/.621 Lobe Sep 114 or 115

LilJohn

Are you talking about a lage frame 88?

BMF_Racing

iTrader: (6)

The turbo I have is a PTE PT4788 -- T6 0.96 a/r. It has the same internal wheels a the GT4788 but has the smaller compressor cover from the old pt88. Its rated to 1450hp where the GT4788 is 1600hp ... at least that what I was told. HTH

71 chevy

iTrader: (18)

I'm running a 234 234 612 612 114 on my 364 but it was specced for a turbo 408.
I'm running alky and 10.5:1 comp with a vic jr. The midrange is effing brutal, and it pulls to 7600, for your reference.I'm running 21 degrees of timing.

BMF_Racing

iTrader: (6)

What size turbo did/do you have? Does it spool ok with the 114 Sep? What rpm do you see zero and 5psi?

Thank you in advance for the info.

71 chevy

iTrader: (18)

twin 61s. does it spool ok? lol

on the transbrake ,its on the spring setting (11 psi) and 5300 rpms in 1.1 seconds (this is as of my last datalog last sunday) the spool is ridiculous

i'll check to see when it hits positive and 5 psi when I get home today.

with a 408 and methanol, lets just say you wont be worrying about spool. you'll be trying to tame the boost onset.

LilJohn

That cam fits well with that turbo and Ci.

71 chevy

iTrader: (18)

went back and looked at some recent logs. positive pressure as low as 3600, and 5-6 psi at 4500

BMF_Racing

iTrader: (6)

Thanks guys, I just wanted to make sure it wasn't way off for my setup/goals. I do appreciate the input.