Need help with winter project.....please.
Thread Starter
Heel & Toe
Joined: Jun 2010
Posts: 20
Likes: 1
From: Jonesboro Arkansas
Need help with winter project.....please.
I have bought a LQ4, 402cid with Eagle turning assembly installed. Nothing is torqued on the block yet. Also have a new set of CNC L92 heads casting #5364. I hope to use my supercharger setup from East Coast along with my meth. kit. I need to know what would be a good cam for this setup? It will see a lot of daily driving & not a lot of track time, if any. Just wanting something special as this will be my last build. This will be going in my 99FRC 6sp. Already have harden half shafts & level 4 transmission. Also have 410 gears. Right now my RWHP is at 535hp but I won't to jump it up there. Also I'll install the LS9 head gaskets & would like to know what size pulley to install to increase boost safely, if thats possible. Have long tube headers. FAST 102mm intake & 102mm electronic throttle body (trying to find this part at better price). Should I install a wide band that will monitor both banks? If so which is the best? Any help would be appreciated. I'll be doing the work myself over the winter. Thanks for any & all input.
Rusty
Rusty
Last edited by usmcrhwk; Dec 7, 2013 at 03:31 PM.
ISIS SUCKS FAT CHOAD
Joined: Oct 2008
Posts: 8,124
Likes: 53
From: Earth, United States
Hey rusty. Sounds like a cool build. You're starting with a really good foundation with the LQ4 block. What are your power output goals? What blower are you running? Whats the static compression ratio of your engine going to be?
It seems that generally with a centrifugal blower set up you dont need a lot of cam to make good power. However, what arun has demonstrated to us with his unorthodox cam selection process is that if a cam makes good power in NA form its going to make more with a centrifugal blower setup. Now there's always exceptions to everything. What cam are you currently running? Oh and you may want to consider a different gear. I don't even think the guys who drag race centri cars are running gears like yours.
It seems that generally with a centrifugal blower set up you dont need a lot of cam to make good power. However, what arun has demonstrated to us with his unorthodox cam selection process is that if a cam makes good power in NA form its going to make more with a centrifugal blower setup. Now there's always exceptions to everything. What cam are you currently running? Oh and you may want to consider a different gear. I don't even think the guys who drag race centri cars are running gears like yours.
Thread Starter
Heel & Toe
Joined: Jun 2010
Posts: 20
Likes: 1
From: Jonesboro Arkansas
Thanks for responding. No real output power goals set. I just want to get all I can out of what I have. Running the ECS Novi 2000 with intercooler. The engine was being built for NA and has about 11.5 to 1 compression. I'm hoping the LS9 head gaskets will drop this some & I may change out the pistons. Any suggestions? No cam installed yet. Right now I'm just running a stock LS1 with the ECS Novi 2000 Supercharger, Meth Injection, Vararam Air Induction, Belanger Headers, X-Pipe, LS-6 Intake, Wide Band O2 Sensor with Guage, Fuel Pressure Guage, Level 5 T56 Polished Transmission Gears, 3 Ribbed Differential Case with C6-Z06 One Piece Spider Gear, C6-Z06 Shifter Housing, New C6-Z06 Up Graded Differential shafts. I've had the car going on 4 years & it had the 410's in it when I got it. Not too crazy about them & I have a friend that restores & parts out corvettes & I'm thinking about trying to trade this setup for 373's, what do you think about those gears with this setup??
ISIS SUCKS FAT CHOAD
Joined: Oct 2008
Posts: 8,124
Likes: 53
From: Earth, United States
Personally id put a 3.42 gear in there. In an NA setup the low gears help make torque. You wont have that issue with the blower. The car will make plenty of torque through out the power band. As for your compression its sightly high but you can run a larger blower pulley (less boost) and or restrict the inlet of the blower. I'd think if you run 8 lbs of boost. Meth injection, a 3.42 gear and a cam somewhere in the high 220s on the Intake and high 230s on the exhaust side, with a good quality tune, the car will make tons of power and be reliable and fun to drive.
The car should be very responsive with the higher compression and lower boost.
ill put it this way it will easily make over 700 (im probably underestimating) the wheels if tuned right and it wit will bitch slap almost anything you come up on.
The car should be very responsive with the higher compression and lower boost.
ill put it this way it will easily make over 700 (im probably underestimating) the wheels if tuned right and it wit will bitch slap almost anything you come up on.
Last edited by MVP'S ZO6; Dec 7, 2013 at 05:11 PM.
Drifting
Joined: Mar 2011
Posts: 1,412
Likes: 15
From: Richardson TX
You shouldn't need to monitor both banks with a wideband. One will do. You really just use the wideband to tune the car. After its been tuned, its more to monitor incase something goes wrong.
You already have narrowband 02 sensors on both banks, and can monitor them with HP Tuners or other logging software, and can look for changes in each bank incase one of the headers crack, or some other issue. You can also look at the fuel trims which will let you see if one bank of cylinders is behaving differently than the other bank.
Other than that, sounds like it'll be a nice set-up. I have a LQ9 with LS9 gaskets in my car, and it has worked well so far.
There's a few minor differences between LQ4 blocks and LSx blocks, but I'm sure you're already aware. Nothing too serious, mostly just a few sensors that are in different places.
You already have narrowband 02 sensors on both banks, and can monitor them with HP Tuners or other logging software, and can look for changes in each bank incase one of the headers crack, or some other issue. You can also look at the fuel trims which will let you see if one bank of cylinders is behaving differently than the other bank.
Other than that, sounds like it'll be a nice set-up. I have a LQ9 with LS9 gaskets in my car, and it has worked well so far.
There's a few minor differences between LQ4 blocks and LSx blocks, but I'm sure you're already aware. Nothing too serious, mostly just a few sensors that are in different places.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
I would recommend a custom cam from Brian Tooley Racing. He's very deliberate on his lobe profile choices and valve timing. The lobe profiles will be designed for long-term use with high-RPM stability in mind. So many cam grinds out there will cause problems over the long haul and they do it for a few extra horsepower but sacrifice your valvetrain stability in the process. When you lose stability, you risk problems like breaking valves and killing your motor.
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