383 v. lsx

86iroc305

86iroc305

Forum Member
So after long diliberting i've decided i sorta want to ditch the 383 afr superram setup and go with a lsx base motor with a single turbo. i was thinking like a 5.3 with a cam and ls1 intake and a 76mm turbo intercooled. im just wondering if anyones gone turbo on a lsx motor how bad was making piping, and such. i also was gonna use a 98 ls1 harness and pcm from a auto car to make it all go. i was thinking that the lsx turbo would allow the car to go mid-low 11's and still remain driveable, as apposed to a high compression big cam 383 were brakes (vaccum) and idling and such would become a issue. what do you guys think ?
 
I daily drive my car and has been 11.76 so far. If you are just going for 11's don't waste time with a turbo, you can do it much more easily (and cheaper) NA. I still get 15 mpg in the city and got 22 on a trip to Sault St. Marie last weekend. Plenty streetable.

-Geoff
 
76mm 5.3 and head and cam is a 9 second reciped in the right chassis.

Whitehawk is right. Its easy to go mid to low 11's with a 5.7 or 6.0 ls1 naturally aspirated.


86iroc305 said:
So after long diliberting i've decided i sorta want to ditch the 383 afr superram setup and go with a lsx base motor with a single turbo. i was thinking like a 5.3 with a cam and ls1 intake and a 76mm turbo intercooled. im just wondering if anyones gone turbo on a lsx motor how bad was making piping, and such. i also was gonna use a 98 ls1 harness and pcm from a auto car to make it all go. i was thinking that the lsx turbo would allow the car to go mid-low 11's and still remain driveable, as apposed to a high compression big cam 383 were brakes (vaccum) and idling and such would become a issue. what do you guys think ?
Click to expand...
 
But a turbo will get you there easily too. I am on a stock block with just upgraded valve springs, pushrods, and fuel system. I daily drive it to work and even drove it to the last track rental, made 5 passes, and drove home. I would be the in the 11's if I had stickier tires on the back. But those will not be going on until I get a new rearend under the car.

You can fab your own piping if you are good at welding. Just order a bunch of bends and go to town. There are tons of installs and conversion pics to reference over on LS1tech.
 
I love the 383 Stroker's but an LSX is the way to go!

I have heard that the LS1 is the god-sent of engines!:angel:
 
If you go that route you may as well get one of the 6.0L with H/C/I like stated above. Even the stock 6.0L heads are good though.....
 
yeh alot of people saying to get the msot out of it go 6.0 but i figured i could get a 5.3 DIRT cheap and jsut build up from there also this sparked my plans with the 5.3 http://www.s10forum.com/forum/f213/whats-black-x-been-up-to-new-project-306280/ but yeh ive seen bolt on lsx car go 12's so i figured keeping it really mild with a lil boost could go 11's, i also thought the h/c/i route with a lsx but woudlnt that pose the same issues as h/c/i 383 ? whats bad about the 98 pcm ?
 
I know of a fox body running 9's with a 5.3L, cheap turbo and HPM suspension stuff. The guys really didn't spend much at all on the car and they've been beating the piss out of it on the street and at the track and it keeps laying down 700 HP and it keeps not breaking.
 
I don't know the specifics that are diff on the 98 pcm, but MAF tables aren't as big, slower processor, less memory, less available adjustments.

BTW define dirt cheap
 
get a used 5.3 pull out for 500 and go from there since its going to be torn apart any way not to mention the 5.3 have a iron block a lil stronger then the aluminum of a 5.7
 
86iroc305 said:
get a used 5.3 pull out for 500 and go from there since its going to be torn apart any way not to mention the 5.3 have a iron block a lil stronger then the aluminum of a 5.7
Click to expand...

I have a 5.3 shortblock for sale, you just would need to pick it up. Make an offer on it if you like.

And you can bore out the 5.3 to a 5.7. The iron block 5.3 was supposed to be a 5.7, but GM killed off the B-body platform in 96.
 
GeosRide said:
I have a 5.3 shortblock for sale, you just would need to pick it up. Make an offer on it if you like.

And you can bore out the 5.3 to a 5.7. The iron block 5.3 was supposed to be a 5.7, but GM killed off the B-body platform in 96.
Click to expand...


sorry to step on your toes, but the 5.3 CANNOT be bored that much, it has a 3.78ish bore, the 5.7 has a 3.898 bore
 
if it were me I'd use a 6.0L block, bore it .030 over and get a good forged slug. Use an h-beam rod of some sort, with the stock crank. Use the stock heads un-touched with nothing more than a spring to match the cam and your choice of turbo. Then hold on.
 
ok, let me rephrase my statement, I would never bore something out that much, there has to be a reason the 4.8 and 5.3 have the same wall thickness, and have that much to begin with
 
88ls1blazer said:
ok, let me rephrase my statement, I would never bore something out that much, there has to be a reason the 4.8 and 5.3 have the same wall thickness, and have that much to begin with
Click to expand...

The 5.3 liter started out life as a 5.7 liter for the B-body. Then they axed the B-body. GM decided that they could roll back the bore to 3.78 to save some fuel. They never bothered to change the block design, they just use a really thick sleeve instead. All of these blocks are based on 4.40" bore spacing. If you take a 5.3 and bore it out to 3.898 (you can take it to 3.905" like the LS1 block) the wall thickness stays the same.
 
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