Help me choose a turbo 6l truck
04-28-2024, 01:34 PM
#1
Help me choose a turbo 6l truck Hey guys, looking for help sizing a turbo, build is as follows.
6l LQ4 - forged rods and pistons (flat top -5cc reliefs) with 799 heads (softened and ported) - Compression ratio should be 10.6:1 and quench is right about 0.043" (If needed I'll throw on some cleaned up 317 heads to drop comp to 10.1). Pistons and Heads are all coated with a Thermal Barrier.
Cam is a Summit 8720R1 - 218/227 112+2 0.600" lift. Late truck intake.
The Truck is a 2005 2500HD with a 4l80e and 4.10 gears with 33" tires - So nearly 60mph in first at 6500rpm. The thing weights just about 6200lbs
I'm building another transmission that will be internally dual feed and some other upgrades, but not too sure as for what stall convertor ATM but will probably be triple disk so I can tow with the TCC locked if I want
I had used a demo of Engine Analyzer Pro, I was comparing a GT42 turbo (I believe that's similar to a 7875?) and a GT45. A buddy of mine has a 76mm turbo kit he wants to sell me, I'm assuming that would be comparable to the gt45?
Basically I'm planning to run anywhere from 8 to 14psi of boost looking for 800-900hp and torque at the crank. I want something that spools up quick although I now that since the truck is heavy, it may not matter as much? Also being a street vehicle, I would hope for decent efficency around cruising rpm which is like 2500rpm +/- 500rpm. Something that at lower throttle speeds will just start to creep into boost. Should I just get the 76mm kit from my buddy or would something else be better. Whatever turbo I run will also be getting some Thermal Barrier applied to aid spool times and thermal efficency.
anyways, any help would be appreciated. Wondering about turbo choice as well as flange and housing choices.
6l LQ4 - forged rods and pistons (flat top -5cc reliefs) with 799 heads (softened and ported) - Compression ratio should be 10.6:1 and quench is right about 0.043" (If needed I'll throw on some cleaned up 317 heads to drop comp to 10.1). Pistons and Heads are all coated with a Thermal Barrier.
Cam is a Summit 8720R1 - 218/227 112+2 0.600" lift. Late truck intake.
The Truck is a 2005 2500HD with a 4l80e and 4.10 gears with 33" tires - So nearly 60mph in first at 6500rpm. The thing weights just about 6200lbs
I'm building another transmission that will be internally dual feed and some other upgrades, but not too sure as for what stall convertor ATM but will probably be triple disk so I can tow with the TCC locked if I want
I had used a demo of Engine Analyzer Pro, I was comparing a GT42 turbo (I believe that's similar to a 7875?) and a GT45. A buddy of mine has a 76mm turbo kit he wants to sell me, I'm assuming that would be comparable to the gt45?
Basically I'm planning to run anywhere from 8 to 14psi of boost looking for 800-900hp and torque at the crank. I want something that spools up quick although I now that since the truck is heavy, it may not matter as much? Also being a street vehicle, I would hope for decent efficency around cruising rpm which is like 2500rpm +/- 500rpm. Something that at lower throttle speeds will just start to creep into boost. Should I just get the 76mm kit from my buddy or would something else be better. Whatever turbo I run will also be getting some Thermal Barrier applied to aid spool times and thermal efficency.
anyways, any help would be appreciated. Wondering about turbo choice as well as flange and housing choices.
04-28-2024, 08:02 PM
#2
Garrett Turbo for sale, one Hi, I have a used, one hour dyno time, GT turbo for sale.
I will make you a great price, made 960HP
Panteraefi@gmail.com
I will make you a great price, made 960HP
Panteraefi@gmail.com
The following 2 users liked this post by TrendSetter:
Ls1Rx-7 (04-30-2024), sewerpickle (04-30-2024)