Boost limits of mildly built 5.3
11-12-2009, 09:07 AM
#1
Boost limits of mildly built 5.3 I am starting my S13 5.3L turbo build and wondering what the boost limits will be and what is the failure mode when the LSx fail under boost.
5.3 with 9.0-1 CR forged slugs
oem ported heads
arp rod bolts and head studs(maybe 1/2" studs if I needed)
MLS head gaskets
MS3 cam kit from TSP with dual springs
truck manis
Holset 72mm HX55 for now(BW S475 or larger next summer)
glide w/3600 vigilante
Would like to start with a .6 bar spring putting it at about 8psi at the manifold and go from there. I have been told that 15-16psi on race fuel is about all I should ever push through this setup. I know that will be more than enough in the >3000lb chassis but I was wondering with the lower compression what limits the LSx on boost. Head clinch area, etc???? I will need a little more boost out of the Holset to make the power I would with a bigger turbo.
Please remember that I come from the world of turbo 4cyl where it takes 20psi to make 400whp. I'm sure there will be a learning curve.
5.3 with 9.0-1 CR forged slugs
oem ported heads
arp rod bolts and head studs(maybe 1/2" studs if I needed)
MLS head gaskets
MS3 cam kit from TSP with dual springs
truck manis
Holset 72mm HX55 for now(BW S475 or larger next summer)
glide w/3600 vigilante
Would like to start with a .6 bar spring putting it at about 8psi at the manifold and go from there. I have been told that 15-16psi on race fuel is about all I should ever push through this setup. I know that will be more than enough in the >3000lb chassis but I was wondering with the lower compression what limits the LSx on boost. Head clinch area, etc???? I will need a little more boost out of the Holset to make the power I would with a bigger turbo.
Please remember that I come from the world of turbo 4cyl where it takes 20psi to make 400whp. I'm sure there will be a learning curve.
11-12-2009, 02:03 PM
#2
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im making 15psi through a stock 5.3l shortblock with patriot stg 2 317 heads, ls6 intake with a tc 76...
where did you get the forged pistons for your 5.3l?
where did you get the forged pistons for your 5.3l?
11-12-2009, 06:33 PM
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i guess wiesco makes an off the shelf model.. custom one im sure are avail. as well
http://www.texas-speed.com/SHOP/item...d=988&catid=38
http://www.texas-speed.com/SHOP/item...d=988&catid=38
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11-13-2009, 01:56 AM
#8
I am starting my S13 5.3L turbo build and wondering what the boost limits will be and what is the failure mode when the LSx fail under boost.
5.3 with 9.0-1 CR forged slugs
oem ported heads
arp rod bolts and head studs(maybe 1/2" studs if I needed)
MLS head gaskets
MS3 cam kit from TSP with dual springs
truck manis
Holset 72mm HX55 for now(BW S475 or larger next summer)
glide w/3600 vigilante
Would like to start with a .6 bar spring putting it at about 8psi at the manifold and go from there. I have been told that 15-16psi on race fuel is about all I should ever push through this setup. I know that will be more than enough in the >3000lb chassis but I was wondering with the lower compression what limits the LSx on boost. Head clinch area, etc???? I will need a little more boost out of the Holset to make the power I would with a bigger turbo.
Please remember that I come from the world of turbo 4cyl where it takes 20psi to make 400whp. I'm sure there will be a learning curve.
5.3 with 9.0-1 CR forged slugs
oem ported heads
arp rod bolts and head studs(maybe 1/2" studs if I needed)
MLS head gaskets
MS3 cam kit from TSP with dual springs
truck manis
Holset 72mm HX55 for now(BW S475 or larger next summer)
glide w/3600 vigilante
Would like to start with a .6 bar spring putting it at about 8psi at the manifold and go from there. I have been told that 15-16psi on race fuel is about all I should ever push through this setup. I know that will be more than enough in the >3000lb chassis but I was wondering with the lower compression what limits the LSx on boost. Head clinch area, etc???? I will need a little more boost out of the Holset to make the power I would with a bigger turbo.
Please remember that I come from the world of turbo 4cyl where it takes 20psi to make 400whp. I'm sure there will be a learning curve.
11-14-2009, 10:17 AM
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