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Old 01-21-2012, 03:50 PM   #1
Slo Krt
 
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Default LS Swap Research - 4.8 & 5.3

Alright, Im planning on doing a V8 swap and have narrowed my choice down to a GM LS-X.

Now, rather than do all this research and keep it on my computer where im the only one who can find it. I figured id start a thread as a place to post all that i find for all to see who may be looking into the same thing.

I have decided to focus on the 4.8 and the 5.3. Power and torque is about double of what the KA24 puts out. They are the same block, and basically the same engine. The only difference is that the 5.3 is the stroked version of the 4.8, hence the greater torque output.


Basic LS specs:

4.8 LR4 - Produces +/- 270 hp & 285 tq.

5.3 LM7 - Produces +/- 300 hp & 320 tq.

Weight: Approx 380lbs (only slightly more than a stock KA) *approximately 490lbs with accessories*

These are approximate specs, depending on the specific donor vehicle the specs vary slightly up or down.

Here is some good info for the LS Weight comparison to a KA24.
http://ls1tech.com/forums/conversion...ce-inside.html

http://www.ls1tech.com/forums/


Fuel Delivery -

looks like The 99-2004 year LS engines use a returnless fuel system. for this you will need an inline fuel pump (walboro 225 or similar) and the corvette filter/regulator.

Fuel Filter regulator choices -
http://www.summitracing.com/search/D...3/?Ns=Rank|Asc

Fuel Pump option -
http://treperformance.com/i-788467-u...fuel-pump.html

or this one to go in the tank.
http://treperformance.com/i-133074-n...1986-1997.html


*I will continue to edit this initial post as I add information.*



Stock KA24 Power and Weight Specs:

HP: 134
TQ: 152
Weight W/Accessories: 375
Manual Transmission weight: 80 lbs. (thanks to David29 for clarifying)

http://forums.nicoclub.com/240sx-ka2...t-t299879.html


Please post if you have information to share.

Last edited by Slo Krt; 02-05-2012 at 10:36 PM.
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Old 01-21-2012, 03:52 PM   #2
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Now, for the first question....

Does any one know the approximate weight of the KA24?

EDIT: Found the info in the web.... added info the initial post.

Last edited by Slo Krt; 01-21-2012 at 05:07 PM. Reason: Found KA Weight
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Old 01-21-2012, 06:53 PM   #3
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Check this site out..I was thinking about putting a LS engine in a old 280zx I had.

http://www.hinsonsupercars.com/s-3-n...0sx-89-94.aspx
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Old 01-21-2012, 08:12 PM   #4
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Weight isn't really an issue... I'm in the middle of a 5.3 swap in my frontier... It actually fits quite easily.. the tranny tunnel needs some love.. well if u ain't bodied it prolly won't... It's very straight forward really... What questions do u have?
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Old 01-21-2012, 11:31 PM   #5
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The KA24E motor produces 134 HP, not the 140 HP you have listed.
The 5 speed trans is right at 80 lbs. with the shifter.
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Old 01-22-2012, 05:13 AM   #6
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Quote:
Originally Posted by Gostlrs View Post
Check this site out..I was thinking about putting a LS engine in a old 280zx I had.

http://www.hinsonsupercars.com/s-3-n...0sx-89-94.aspx

Thanks for the link. There seems to be some good stuff there.... Might need to use this later.
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Old 01-22-2012, 05:18 AM   #7
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XGOLFERDUDE.... Well, Ive been doing some more reading on LSX set ups. What i havent found is reliable and or even detailed info on the fuel system upgrades that will be necessary. Likewise for mounts. Will i need to fab mounts???? Ill want to set the motor as far back and as low as possible to keep my weight balance as even as possible for handling.

Anyone have info on either topic?

As I said before, Ill be updating my first post with relaible info as i come across it.

Thanks for the Help guys!
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Old 01-22-2012, 05:51 AM   #8
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I would think some of the items on that site should work for the truck as well. Good Luck
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Old 01-22-2012, 11:53 AM   #9
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I di a lsx swap in my old camaro. for the fuel lines I ran just one line to the motor. with a corvette filter regulator right at the tank.most of the newer ls motors only have 1 inlet at the rail anyway.some like to run 2 lines up with reg at motor.will give you a more accurate pressure but unless you plan to turbo or something. why complicate it?as for the motor mounts I just made a template out of cardboard.cut some 1/4 in flat steel and used old style small block mounts.
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Old 01-23-2012, 01:20 AM   #10
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Yes u will need to fab motor mounts... I used some from welderseries.com for mine as well as some kind of tranny mount.. I am also running 2 lines with the regulator at the motor.. as far as the harness goes you can get someone to modify the harness it comes with... That way it'll be a 4 wire hookup.. and then you'll need to reflash the pc... You'll need to find a ls1 intake so u can use a throttle cable instead of the nasty drive by wire... Don't over think it... It's really not that hard to out a ls based motor in anything.. just take it system by sytem and take it slow... It's cake...
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