Diesel boost! 
Headgasket Choices? (boost)
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
A couple of years ago I was at the track with a buddy of mine helping him with his first gen Camaro (full tube car).
He went hoping for 5.30s and we were down to 4.88 by the time we left on a forged 4.8 at the top of his 3-bar MAP (twin S369s, Hi-ram with fabricated top, A/W, on methanol).
He sold the car right after, one of the guys that works for one of the LS wiring harness companies (can't remember which) has it now but I think bought it as a roller.
I guess weight plays a big factor, Capizzi is somewhere around 2700 lbs and the Camaro was 2400, as does fuel type, track conditions, etc.
I'm a pretty big proponent of the actual amount of boost being irrelevant in most cases, but almost 50 lb seems like a lot lol.
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
I think Capizzi's new car is very very very light. But who knows. No one likes to tell everyone the whole truth about their set up these days.
Didn't Capizzi just run 4.50 on a stock bottom end 5.3 on 28 PSI on stock 5.3 head gaskets?
A couple of years ago I was at the track with a buddy of mine helping him with his first gen Camaro (full tube car).
He went hoping for 5.30s and we were down to 4.88 by the time we left on a forged 4.8 at the top of his 3-bar MAP (twin S369s, Hi-ram with fabricated top, A/W, on methanol).
He sold the car right after, one of the guys that works for one of the LS wiring harness companies (can't remember which) has it now but I think bought it as a roller.
I guess weight plays a big factor, Capizzi is somewhere around 2700 lbs and the Camaro was 2400, as does fuel type, track conditions, etc.
I'm a pretty big proponent of the actual amount of boost being irrelevant in most cases, but almost 50 lb seems like a lot lol.
A couple of years ago I was at the track with a buddy of mine helping him with his first gen Camaro (full tube car).
He went hoping for 5.30s and we were down to 4.88 by the time we left on a forged 4.8 at the top of his 3-bar MAP (twin S369s, Hi-ram with fabricated top, A/W, on methanol).
He sold the car right after, one of the guys that works for one of the LS wiring harness companies (can't remember which) has it now but I think bought it as a roller.
I guess weight plays a big factor, Capizzi is somewhere around 2700 lbs and the Camaro was 2400, as does fuel type, track conditions, etc.
I'm a pretty big proponent of the actual amount of boost being irrelevant in most cases, but almost 50 lb seems like a lot lol.
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Verdad Gallardo Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
I maxed out my billet S475 on my L33 a few years ago. It wouldn't make power over 28 PSI.
My wastegate failed not too long after and I managed 42 PSI, 182% duty cycle on my deka 80s at 60 PSI base with a 1:1, on 93 octane. I'm positive it wasn't making anymore power, despite nearly another full bar of boost.
My wastegate failed not too long after and I managed 42 PSI, 182% duty cycle on my deka 80s at 60 PSI base with a 1:1, on 93 octane. I'm positive it wasn't making anymore power, despite nearly another full bar of boost.
I maxed out my billet S475 on my L33 a few years ago. It wouldn't make power over 28 PSI.
My wastegate failed not too long after and I managed 42 PSI, 182% duty cycle on my deka 80s at 60 PSI base with a 1:1, on 93 octane. I'm positive it wasn't making anymore power, despite nearly another full bar of boost.
My wastegate failed not too long after and I managed 42 PSI, 182% duty cycle on my deka 80s at 60 PSI base with a 1:1, on 93 octane. I'm positive it wasn't making anymore power, despite nearly another full bar of boost.
On The Tree
Joined: Jul 2017
Posts: 193
Likes: 2
The 5.3l MLS gaskets will hold up just as long as any one component in a SBE engine lol. People having trouble with them are missing on the tune up and the combo in general. People trying to make diesel torque with the wrong cams hurt them too.
For the most part I agree, but not everyone races 2500lb automatic cruise missiles. When you race 4000+ lb manual trans land yachts you need some tq to run any sort of decent time. Have made 1000+ tq on a 5.3 without issues from an LS9 gasket with 230/235 114, 237/234 117, 231/239 113 cams. If you have some cam suggestions that would work better I'm all ears!
TECH Fanatic
Joined: Feb 2015
Posts: 1,080
Likes: 178
For the most part I agree, but not everyone races 2500lb automatic cruise missiles. When you race 4000+ lb manual trans land yachts you need some tq to run any sort of decent time. Have made 1000+ tq on a 5.3 without issues from an LS9 gasket with 230/235 114, 237/234 117, 231/239 113 cams. If you have some cam suggestions that would work better I'm all ears!
I use these with 317 heads on a 5.3 they are 5 layer with a 4.080 bore. Have been as high as 25lbs with no problems. GM OEM-Engine Cylinder Head Gasket 12610046