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yet another ls nissan

This is a discussion on yet another ls nissan within the LSx Retrofit and Swap forums, part of the LSx Technical Help Section category; I'm tossing a 5.3l in a 300zx. Plans are to turbo by the end of the year. The build I'm ...

  1. #1
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    yet another ls nissan

    I'm tossing a 5.3l in a 300zx. Plans are to turbo by the end of the year.
    The build I'm going with flattops, ls6 cam , ls6 intake, 60lb injectors
    I'm just not set on a Trans yet. Ether 4l60e or th400 but I am planning on a 32-3500 stall.
    I just wanted to see if I'm on the right track.

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    Spaz is My Mentor SMWS6TA's Avatar
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    What kinda heads you plan on running? 317's

    You're going to want to run a dish style piston or configure your build to get the compression ratio around the 9's for a turbo. I've seen a few guys use the 5.3's, dish pistons and 317 heads with stock exhaust manifolds with turbo and putting out some damn nice numbers.

    The bottom end on 5.3's are pretty good. Only 2 things I would strongly recommend are switching the rod bolts over to ARP's and replace the bearings with a good set like Clevite or King bearings and good set of rings for boost applications.

    Another thing you're going to need/want is a turbo cam, the LS6 is more for natural aspirations. It may get the job done, but later on you'll wish you had got the right cam in the first time.

    The 4L60e will do ok, might need some beefing up depending on the output of your turbo build. Might want to look for a 4L80e. I have a buddy running a T350 and it runs like a scalded dog on his nitrous setup but sucks on mpg on hwy.

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    862 heads
    I have the clevite bearings and apr bolts.
    Goal for this year is 600 rwhp.
    And before it's turbo I need it to turn a 12.99 or faster
    And the cars weight will be around 2600 race weight.

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    Moderator 35th-ANV-SS's Avatar
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    What compression are the 5.3L's stock? I thought around 9.5:1.

    I'm running 8psi on 10.1:1 compression without any issues. Depending on how much boost you'll be running you want lower compression as Scott stated.

    Have you considered methanol injection as a suppliment?

    That car is going to haul with it being so light weight.
    It's on jackstands.

  5. #5
    Spaz is My Mentor SMWS6TA's Avatar
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    yet another ls nissan

    depends on which head they have Jon. 317 vs 862's
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

    http://www.ls1.com/forums/f8/my-8-8-rear-build-165553/

    6.0L Block - Forged 403 built, breaking it in , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, Monster Stg 4 Clutch, QT SFI BH, MWC DSL, UMI: SFC, PHB, LCA's, LCA Relocation Brackets & TA, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/4.10 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    Horsepower never lies, but is often lied about!

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    Quote Originally Posted by 35th-ANV-SS View Post
    What compression are the 5.3L's stock? I thought around 9.5:1.

    I'm running 8psi on 10.1:1 compression without any issues. Depending on how much boost you'll be running you want lower compression as Scott stated.

    Have you considered methanol injection as a suppliment?

    That car is going to haul with it being so light weight.
    Well I'm going to drive the car as n/a car for a about 6 to 8 months. And I was only planning on 7-16lbs of boost. I don't know if this is right but my friends were telling me I need to go to 243 heads when I turbo how much would that change my compression?

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    depends on which head they have Jon. 317 vs 862's
    he mentioned 862 above. What would that make it?

    The downside of lower compression and being NA is that the car will lack a bit for those 6-8 months until you get your turbo setup on it.

    What head unit are you looking at for the turbo?

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    Moderator 35th-ANV-SS's Avatar
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    Pretty sure 243 heads would bump up your compression from the 862 heads from 9.5:1 to 9.9:1. Someone can confirm as I'm no novice.

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    Quote Originally Posted by 35th-ANV-SS View Post
    Pretty sure 243 heads would bump up your compression from the 862 heads from 9.5:1 to 9.9:1. Someone can confirm as I'm no novice.
    I'm a novice with ls engines. But I've done a lot of research and I thought the 243 have a bigger combustion chamber then the 862
    I could be mixed up

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    Spaz is My Mentor SMWS6TA's Avatar
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    Got this from another site but the info is what I think you're looking for:
    243
    Heads: 2001+ LS6 5.7 liter passenger car
    Material:Aluminum
    Part Number: 12564243

    What you need to know:
    The LS6 cylinder heads is essentially a tuned-up version of the LS1 head. At 65cc, the combustion chamber is slightly smaller and more efficient than the LS1. The more efficient design shortens burn times and ultimately means less ignition timing advance is required to produce the same power. And because less timing allows more efficient combustion, the Ls6 heads allow the engine to produce more torque. The exhaust port is a unique D-shape that improves flow. LS6 heads are the best choice only when all-out power is needed. Be prepared for a big price tag at the dealer or steep core charge from your head porter.

    Combustion chamber Volume:64.45cc
    Compression Ratio:10.5:1
    Intake port Volume:210cc
    Exhaust Port Volume:75cc
    Intake valve Diameter:2.00-inches
    Exhaust valve Diameter:1.55-inches

    What you need to know: These small combustion chamber truck heads offer no advantage over an LS1 head except the smaller combustion chamber. This along with milling of the deck surface will allow a slightly higher compression ratio to be achieved. Because of the smaller intake valve installed in these heads a valve upgrade is practically mandatory.

    706 & 852 & 862
    Head: 1999+ LR4 4.8-liter Truck
    1999+ LM4 / LM7 5.3-liter Truck

    Material:Aluminum
    Part Number: 12559852, 12561706 ,12559862

    Combustion chamber Volume:61.15cc
    Compression Ratio:9.5:1
    Intake port Volume:200cc
    Exhaust Port Volume:70cc
    Intake valve Diameter:1.89-inches
    Exhaust valve Diameter:1.55-inches

    873
    Head: 1999-2000 LQ4 6.0-liter Truck
    Material: Cast Iron
    Part Number: 12567873

    Combustion chamber Volume:71.06cc
    Compression Ratio:9.5:1
    Intake port Volume:210cc
    Exhaust Port Volume:75cc
    Intake valve Diameter:2.00-inches
    Exhaust valve Diameter:1.55-inches

    What you need to know: The LQ4 heads are found on the low-performance version of the 6.0-liter truck engine. They offer a large combustion chamber that lowers compression ratio making them perfect for a forced induction application. Swapping on the LQ4 head drops the compression ratio of a typical LS1 engine to 9.:5.1 Cast-iron casting are heavy!
    Last edited by SMWS6TA; 02-24-2015 at 01:46 PM.

  11. #11
    Spaz is My Mentor SMWS6TA's Avatar
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    317
    Head: 2001+ LQ4 6.0-liter Truck
    Material:Aluminum
    Part Number: 12562317

    Combustion chamber Volume:71.06cc
    Compression Ratio:9.4:1
    Intake port Volume:210cc
    Exhaust Port Volume:75cc
    Intake valve Diameter:2.00-inches
    Exhaust valve Diameter:1.55-inches

    What you need to know: The LQ4 head received aluminum heads starting in models year 2001. All other features are the same as previous years iron heads. This is the workhorse head for street / strip turbo and blower cars.


    035
    Head: 2002+ LQ9 6.0-liter Truck
    Material:Aluminum
    Part Number: 12572035

    Combustion chamber Volume:71.06cc
    Compression Ratio:10:1
    Intake port Volume:210cc
    Exhaust Port Volume:75cc
    Intake valve Diameter:2.00-inches
    Exhaust valve Diameter:1.55-inches

  12. #12
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    So will going from a 61.15cc to a 64.45 give me enough drop in compression?
    And thank you SMWS6TA for the info

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