Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Old Aug 19, 2024 | 05:42 AM
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Default redline?

I'm curious what my redline should be set at? one tuner says 7500 a different one says 6800.



231/242 .617"/.592" 112+2 cam
799 heads, bowls cut 3 angle valve job setup with .660 dual springs
I am Running 3.917 bore aluminum block cr is around 10.8:1
summit rods safe to 7500
arp hardware as well as head and main studs.
MSD atomic intake (not ported)
Howard cams tie bar lifters set at .040 preload with 11/32 .120 wall pushrods
BTR shaft mount rocker kit headers (not sure of size)
Headers that work with my e36 body

the goal is to make ~ 440 WHP reliable daily HPD/autox so I want the highest redline I can safely have I'm thinking 7200. I realize I need dyno tune to really know what the best place for my limiter is I'm still building and curious what is realistic from the cam I have ....manual cd009 trans, 1000cc injectors, holley EFI,

Last edited by Sm0kie; Aug 20, 2024 at 05:46 PM.
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Old Aug 19, 2024 | 06:17 AM
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Is your engine going to be making power at those rpm's or falling off? I think 6800 was a good call. When I had my 01 which is a naturally aspirated 427 that runs on 93 octane on the engine dyno the tuner had it shutting down around 6700 and according to numbers my power started falling off by then and maximum torque was achieved at around 5,100 rpms. There's no reason in spinning the engine that high unless it continues to build horsepower and in my case it did not and I don't see how the combination you have would benefit from spinning it that high either.
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Old Aug 20, 2024 | 05:45 PM
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I am not an expert by any means that's why Im asking. The cam was in an LQ4 that spun a rod (not my build) do to a failed cam bearing. It did dyno at 399 and power fell off at 6800 so I think that's why the tuner suggested 6800.

I thought with an upgraded intake and valve train maybe I would make power beyond 6800 but based on your comments Id say I must be wrong. I need a different cam for that.
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Old Aug 20, 2024 | 06:06 PM
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Your heads will run out of flow well before 7000rpm... I would put the redline at what you are comfortable with and simply shift before it unless you need to keep it in a particular gear longer to not upshift.

20 years ago I had a stock LS1 shortblock with AFR205 heads, LS6 intake, Ford red top 30# injectors, and 233/239 .600" lift cam around 11:1 compression with 1 7/8" long tube headers and dual 3" out back for a street car/road race setup in my FD RX-7 2800lbs with 285/30/18 square. It was great on the track and I put redline at 7100rpm. It had 20K hard miles on it and never missed a beat plus it was my commuter car. I didn't own a trailer and drove it to every event aside from the one pictured. Ran bottom 11's@128mph in road race trim and an old T56. I would suggest the Improved Racing oil pan baffle and Accusump plus an oil cooler (Improved Racing built in Tstat unit). If you can run the intake piping into the TB over the radiator without any bends you will gain 15-20rwhp over something with multiple 90* bends.


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