TT2005CREW

Building a forged ls1 for my 2005 crew cab. Built 4l80e conversion with 3.73 gears, weighs 5300lbs and trying to figure out a cam that wont be a total dog down low but will still make good power. I know speed inc makes a couple of grinds that supposedly make good power and aren't crazy lift, but not sure how that would do in a truck. I would like a noticeable idle if at all possible. 88mm T6 1.08 exhaust turbo, 243 heads, all ARP bolts and studs, PI converter currently stalled at 3600, tranny brake. Motor will be 9.5 to 1. Any help or suggestions is appreciated

fastjweb

iTrader: (2)

Modern turbo set ups dont create as much back pressure as in the past. Most people will go with a wider LSA as in 114 to 115 and say its better for boost. With your set up, you can tighten that the lobe separation and go between a 108 to 110 LSA to bring the torque in quicker to get it going. i think a reverse split cam in the 22x/22x range and lift in the 610/608 range, would get it moving nicely and sound great. Heres a good article i think if you want to read it.

Turbo Camshaft Guide - How to Select the Right Cam for Your Turbocharged Engine - Car Craft Magazine

Atomic

iTrader: (42)

I have a 402 with a pt88 t4 with a 226/226 117 cam and its very strong.

TT2005CREW

Thanks for that link, fastj. Thats a good read.

99bluefirebird

iTrader: (7)

Also going 226/226 on a 117 on my 399", recommended by geoff at eps. Pat G seems to reommend 222/226 quite a bit.

TT2005CREW

I don't really mind an off the shelf turbo cam, it just seems that looking at the cams from speedinc, virginia speed, etc., that everybodys specs are all over the place and I just didn't know for a heavy truck like mine I didn't want something that would not seem to pull itself from a stoplight under normal driving, but would still make power to about 6500. From what I have been able to find out with the search button, it seems like the tu1 from speedinc has a pretty noticeable idle, but had not been able to find out what it drove like in a truck with a 4l80.