Most power LS1 can handle?
Most power LS1 can handle? What's the most power LS1 can withstand more or less reliably?
I have forged LS1 (2004' block) - Eagle crank, Eagle H-beam rods, Probe Industries pistons, ARP head bolts, Patriot Stage 2 heads, 9.2:1 compression. What can I squeeze out of this motor? Preferably do it reliably
I'm going to switch to E85 for safety and cooler combustion too.
I have forged LS1 (2004' block) - Eagle crank, Eagle H-beam rods, Probe Industries pistons, ARP head bolts, Patriot Stage 2 heads, 9.2:1 compression. What can I squeeze out of this motor? Preferably do it reliably
I'm going to switch to E85 for safety and cooler combustion too. 
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It's hard to put an exact number on it, but if everythig was machined, and assembled right you should have no problem maxing out a TC78, and maybe a PT88 from time to time if it wants more. Also the tune is the most important part.
Yes, certainly bad tune can kill it at 500whp...
I'm talking about good tune, and moderate build quality.
I guess I should have called thread "How many 900whp+ LS1's are out there"
What would be weakest part in my setup - block, or lifting heads?
I'm talking about good tune, and moderate build quality.
I guess I should have called thread "How many 900whp+ LS1's are out there"
What would be weakest part in my setup - block, or lifting heads?
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There are enough to show it can be done. My guess is you would lift a head first if everything else is right. Light rotating assembly, and keeping the RPM down will also help it live.
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Really there are far too many variables to make a statement like this. The internal components are what will dictate a limit. I mean look at it like this: If you are going to spend $XX,XXX on superior internals, heads, and intake are you really gonna put that in a stock LS1 block?
Really there are far too many variables to make a statement like this. The internal components are what will dictate a limit. I mean look at it like this: If you are going to spend $XX,XXX on superior internals, heads, and intake are you really gonna put that in a stock LS1 block?
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Verdad Gallardo 1CAMWNDR, I would not want to discuss some crazy stupid cases like $100000 internal components with stock LS1 block. I want to understand what LS1 with normal forged internals would handle. Specifically, with my components/heads that I specified in first post
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I have a similar setup and am at around 700 rwhp, don't no that i would like to push the ls1 block much further.
I think heads lifting or cylinder walls splitting would be the main areas of failer to watch.
I think heads lifting or cylinder walls splitting would be the main areas of failer to watch.
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Then push it to 1500 run a few 1/4 mi passes and report back
The studd would be a little stronger 190000psi vs 170000psi arp bolt but the head will likely flex befor you streach the bolt. The stud at the same tq will clamp the head tighter due to the fine thread vs corse.
The studd would be a little stronger 190000psi vs 170000psi arp bolt but the head will likely flex befor you streach the bolt. The stud at the same tq will clamp the head tighter due to the fine thread vs corse.
I dont think it is required to do any more to your heads. Stock 317 heads with good valves and valve job have made over 1000rwhp. I would talk to whoever built your 383 and see if they think it needs anything. At a minimum I would change to ARP head studs. Do you have an actual goal in mind? I bet you could make a pretty reliable 800rwhp. Do you intend to keep the TC78 or get something a little bigger that flows better?
I have ARP bolts now, are studs any better?
Sorry if it was too long, but your answers were technical and useful so I tried to give the most info too
One thing I fail to understand is this head lifting/flexing/whatever problems. In Nissan Silvia world, we don't have ANY aftermarket heads. So some guys run upto 600whp on stock head (record is 700whp). I personally ran around 360whp on stock head, bolts, paper headgasket, ignition, intake. Remember, this is from 110ci engine.
So I can't understand what's going on with heads on LS1, each head only handles half the power, so why can't LS1 run 1000-1200whp? Slightly longer distance between studs perhaps?
So I can't understand what's going on with heads on LS1, each head only handles half the power, so why can't LS1 run 1000-1200whp? Slightly longer distance between studs perhaps?
The problem with lifting heads comes from the LS1 never being designed from the factory to run big boost (15psi+). So it has a fairly thin deck. Also there are only 4 head bolts per bore.
To run more boost reliably you need either an aftermarket head with a thicker deck, or the LSX block that has 6 bolts per bore (Which will require aftermarket 6 bolt heads).
And yes, the studs are quite a lot better than the bolts.
Since you went with a built 4L80 you need not worry as much about breaking a tranny. I'd step up to a larger turbo that will not choke on the exhaust side. Like an S80 or S85
.
To run more boost reliably you need either an aftermarket head with a thicker deck, or the LSX block that has 6 bolts per bore (Which will require aftermarket 6 bolt heads).
And yes, the studs are quite a lot better than the bolts.
Since you went with a built 4L80 you need not worry as much about breaking a tranny. I'd step up to a larger turbo that will not choke on the exhaust side. Like an S80 or S85
. 
The problem with lifting heads comes from the LS1 never being designed from the factory to run big boost (15psi+). So it has a fairly thin deck. Also there are only 4 head bolts per bore.
To run more boost reliably you need either an aftermarket head with a thicker deck, or the LSX block that has 6 bolts per bore (Which will require aftermarket 6 bolt heads).
And yes, the studs are quite a lot better than the bolts.
Since you went with a built 4L80 you need not worry as much about breaking a tranny. I'd step up to a larger turbo that will not choke on the exhaust side. Like an S80 or S85.
To run more boost reliably you need either an aftermarket head with a thicker deck, or the LSX block that has 6 bolts per bore (Which will require aftermarket 6 bolt heads).
And yes, the studs are quite a lot better than the bolts.
Since you went with a built 4L80 you need not worry as much about breaking a tranny. I'd step up to a larger turbo that will not choke on the exhaust side. Like an S80 or S85
.Yes I keep in mind slightly larger turbo, that would help the heads stay too I think.
Lastls1, recently someone posted dyno with 1140whp LS1
So 800whp seems too underrated