2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

all out 2.4 build

Old Sep 9, 2021 | 05:01 PM
  #26  
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200 mph would be a better, more obtainable starting point. Once you're there, then you could evaluate how easy/hard it would be to get to 250 (hard, no matter what).

EDIT: and it's not like hitting 200 mph won't be hard or a big achievement, either.

Last edited by USMCFieldMP; Sep 9, 2021 at 05:06 PM.
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Old Sep 9, 2021 | 05:09 PM
  #27  
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Originally Posted by USMCFieldMP
200 mph would be a better, more obtainable starting point. Once you're there, then you could evaluate how easy/hard it would be to get to 250 (hard, no matter what).
before i swapped to a f40 on my lnf i violently burried the speedo needle in 5th on the 4.05 i had in the car at the time. cluster reads 160 so i know i was FLYING and still had some rpm left.

knowing that little detail, maybe for the racecar i should start by trying to violently burry the f40 needle and being happy with whatever speed i get
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Old Sep 9, 2021 | 05:14 PM
  #28  
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I hit 165 (Interceptor displayed) when I was GM Stage 2 with a 2.8 and supporting mods, so I can easily believe it. I haven't pushed the turbo setup into 5th before.

Which F40 do you have, what's your tire size, and what's your redline?
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Old Sep 9, 2021 | 05:24 PM
  #29  
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Originally Posted by USMCFieldMP
Which F40 do you have, what's your tire size, and what's your redline?
a regal one. this is on my street car though. at the time of the 160+ with the 4.05 i was going to about 7k. was still 100% stock motor. 225/45R18 tires so alittle taller than stock.

i do wanna use a regal f40 for the insane sound barrier breaking ecotec i have in mind.
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Old Sep 9, 2021 | 05:44 PM
  #30  
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Originally Posted by USMCFieldMP
Sure, but my point was more about the ability of turbos though. A GTX3584RS is 1000hp capable. I'm not sure that Garrett offers it in T4 either... I think a lot of their larger turbos, they've moved to full v-band housings.

If you're going for a ton of power, you might be better off doing a 2.1L. LSJ crank/rods + 2.4L block. ZZP makes pistons specifically for that application.

I think I'd probably take the approach of just using an LSJ. The square setup lends itself to higher revs, higher revs are where the power is at, and that's what you're after.

Solid lifters, aggressive cam, rev that sucker out to like 9-10k.



That was my first assumption when I bought it, but the further I dug into it, everything pointed to it being a Gen 2... with Gen 3's only being 2.0's and 2.5's from 2013 and later.
that’s not true. There’s gen 3 2.4s in a lot of vehicles. Mine came from an equinox. No gen 2s have the reinforced cylinders. The one you have posted is 100% a gen 3 out of a 2011+
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Old Sep 9, 2021 | 05:45 PM
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Hitting 200mph in the standing mile with a 4 cylinder would be pretty damn good starting point. It would be a 600-750whp build, maybe a 220mph target if shooting high. Although if you get the aero work done most places can adjust the speed easy
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Old Sep 9, 2021 | 05:45 PM
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LAF and LEA are gen 3 2.4s.
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Old Sep 9, 2021 | 06:32 PM
  #33  
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Originally Posted by ECaulk
Hitting 200mph in the standing mile with a 4 cylinder would be pretty damn good starting point. It would be a 600-750whp build, maybe a 220mph target if shooting high. Although if you get the aero work done most places can adjust the speed easy
i agree. i think i have a good general idea of where to start with all the info thats been shared. 2.1 liter, 10k rev, f40 and a big ol snail.

the car itself is gonna be very very light. probably less than a ton including aero. should be well into the 200s.
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Old May 20, 2025 | 09:55 AM
  #34  
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Sorry to necro-post but ran across this thread researching my Kappa build

I was looking into using a g3 block (lea) to build s max effort 4cyl weekend car.

my goal would be to reuse as many of the lnf parts as possible

I need to use the Kappa head to clear the cowl, will a lnf head bolt to and work on a LEA? Im assuming id need some head work to get the cc to Match up to the larger bore size on the LEA

Can I use Werks LE5 forged rods/pistons?

Anyone know if the sensors are all the same or if ill need to graft new plugs? Anything else I'm missing?

Hopefully @chevygirl2006 @USMCFieldMP pr others fairly knowledgeable will chime in..


Tyia
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