How much nitrous can an LT1 flow?
I think we have a few different definitions of "stock" LT1 floating around in people's heads here! There are not many 400 hp stock LT1's!
With stock heads and stock cam, you reach an exhaust flow limitation long before these 200-275 hp hits being thrown out there.
With stock heads and stock cam, you reach an exhaust flow limitation long before these 200-275 hp hits being thrown out there.
Im just reporting what I have seen first hand. Im not saying to go out and throw a 200+ shot on your stock lt1, but guys do it and get away with it. I was not refering that stock lt1's make 400hp, it was just a number for comparison. A stock lt1 typically run around the 300hp at the crank, so in theory a 150 shot would be about tops...
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Im just reporting what I have seen first hand. Im not saying to go out and throw a 200+ shot on your stock lt1, but guys do it and get away with it. I was not refering that stock lt1's make 400hp, it was just a number for comparison. A stock lt1 typically run around the 300hp at the crank, so in theory a 150 shot would be about tops...
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From: colorado springs Elevation: 6035 ft
Yup this is what I'm talking about. Tou can only stuff so much air/fuel/nitrous into a cylinder before it starts "backing up" into the intake port and intake manifold. I'm not saying I want to stuff a 300 shot on my car I was just wondering how much you could stuff into the cylinder? wor what its worth I I'm doing a stand alone fuel system and using a nitrous outlet plate and plan on spraying a 200 shot.
I think what he is trying to say in the term "Back up" Is like an incidence we had years ago on a carbed small block inhaling a healthy dose of the gas. on the dyno at wot I saw nitrous coming back out of the carb, telling me either it was too much for the set up, ignition ect. Maybe this is what he is saying by back up??
A 200 shot is about the limit of what is safe on stock hyperutectic pistons with stock ring gaps from the factory.... regardless of heads,cam and what not..... I see what the OP is saying but the fact is you won't approach the "filling up the cylinder" limit with fuel/air/nitrous without blowing it up. A nitrous or naturally aspirated motor is not very efficient when it comes to inhaling it's own air..... the cylinder is probably only half as full as it could be even at best.... which is why forced induction makes so much power...... cause now you are approaching much better efficiency breathing.... The engine is an air pump. make it pump air better and you will increase power when you increase fuel accordingly. But nitrous and NA motors LT1's included don't have really great lungs stock.....
going back to the 200 shot limit.
that much cylinder pressure is going to be alot for the stock pistons, rings, rod bolts, etc to handle for many passes.... you might get 5 or you might get 50.... but it will be on borrowed time....
You could run 150 shots all day most likely. A 200 shot is going past or right up against the 50% rule.. (if it's bone stock a 150 shot would be half 300.... If it's H&C a 200 shot would be about half of 400hp).... PURPOSE built nitrous motors can exceed the 50% rule with proper ring gaps and forged pistons, upgraded rod bolts, 4 bolt splayed mains, etc....
going back to the 200 shot limit.
that much cylinder pressure is going to be alot for the stock pistons, rings, rod bolts, etc to handle for many passes.... you might get 5 or you might get 50.... but it will be on borrowed time....
You could run 150 shots all day most likely. A 200 shot is going past or right up against the 50% rule.. (if it's bone stock a 150 shot would be half 300.... If it's H&C a 200 shot would be about half of 400hp).... PURPOSE built nitrous motors can exceed the 50% rule with proper ring gaps and forged pistons, upgraded rod bolts, 4 bolt splayed mains, etc....
I don't buy that 50% rule!
Bone stock, I'd shoot a 150 shot till the cows come home.
I sure as heck wouldn't throw a 200 hit on the motor I'm running now - H/C putting down 425 rw. In fact, I think it would be short-lived with even a 150 shot. 425 SAE is about 525 at the crank, and that's a lot of heat going into the pistons and rings even without any nitrous. I sure would love it if somebody could convice me that I'd be safe with a 150 hit on it.........heck, I'd be gunning for low 10's in this big sled!
Bone stock, I'd shoot a 150 shot till the cows come home.
I sure as heck wouldn't throw a 200 hit on the motor I'm running now - H/C putting down 425 rw. In fact, I think it would be short-lived with even a 150 shot. 425 SAE is about 525 at the crank, and that's a lot of heat going into the pistons and rings even without any nitrous. I sure would love it if somebody could convice me that I'd be safe with a 150 hit on it.........heck, I'd be gunning for low 10's in this big sled!
A 200 shot is about the limit of what is safe on stock hyperutectic pistons with stock ring gaps from the factory.... regardless of heads,cam and what not..... I see what the OP is saying but the fact is you won't approach the "filling up the cylinder" limit with fuel/air/nitrous without blowing it up. A nitrous or naturally aspirated motor is not very efficient when it comes to inhaling it's own air..... the cylinder is probably only half as full as it could be even at best.... which is why forced induction makes so much power...... cause now you are approaching much better efficiency breathing.... The engine is an air pump. make it pump air better and you will increase power when you increase fuel accordingly. But nitrous and NA motors LT1's included don't have really great lungs stock.....
going back to the 200 shot limit.
that much cylinder pressure is going to be alot for the stock pistons, rings, rod bolts, etc to handle for many passes.... you might get 5 or you might get 50.... but it will be on borrowed time....
You could run 150 shots all day most likely. A 200 shot is going past or right up against the 50% rule.. (if it's bone stock a 150 shot would be half 300.... If it's H&C a 200 shot would be about half of 400hp).... PURPOSE built nitrous motors can exceed the 50% rule with proper ring gaps and forged pistons, upgraded rod bolts, 4 bolt splayed mains, etc....
going back to the 200 shot limit.
that much cylinder pressure is going to be alot for the stock pistons, rings, rod bolts, etc to handle for many passes.... you might get 5 or you might get 50.... but it will be on borrowed time....
You could run 150 shots all day most likely. A 200 shot is going past or right up against the 50% rule.. (if it's bone stock a 150 shot would be half 300.... If it's H&C a 200 shot would be about half of 400hp).... PURPOSE built nitrous motors can exceed the 50% rule with proper ring gaps and forged pistons, upgraded rod bolts, 4 bolt splayed mains, etc....
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I don't buy that 50% rule!
Bone stock, I'd shoot a 150 shot till the cows come home.
I sure as heck wouldn't throw a 200 hit on the motor I'm running now - H/C putting down 425 rw. In fact, I think it would be short-lived with even a 150 shot. 425 SAE is about 525 at the crank, and that's a lot of heat going into the pistons and rings even without any nitrous. I sure would love it if somebody could convice me that I'd be safe with a 150 hit on it.........heck, I'd be gunning for low 10's in this big sled!
Bone stock, I'd shoot a 150 shot till the cows come home.
I sure as heck wouldn't throw a 200 hit on the motor I'm running now - H/C putting down 425 rw. In fact, I think it would be short-lived with even a 150 shot. 425 SAE is about 525 at the crank, and that's a lot of heat going into the pistons and rings even without any nitrous. I sure would love it if somebody could convice me that I'd be safe with a 150 hit on it.........heck, I'd be gunning for low 10's in this big sled!
How many dudes you know of with stock LT1's or mildly modified LT1's that are spraying 200 shots that kill their cars at the finish line and pull their plugs to read them??? Probably not many....
Which shows me they don't really give a **** what their tuneup looks like and they just go by the jet recommendations from NOS, or NX, etc..... The same ppl who don't give a **** if your motor blows up running their ****..... When I ran a 150 shot I was plug reading illiterate.... Surprised my **** lasted as long as it did back then in like 1997...
Good post outlaw, this was exactly my point aswell
I don't buy that 50% rule!
Bone stock, I'd shoot a 150 shot till the cows come home.
I sure as heck wouldn't throw a 200 hit on the motor I'm running now - H/C putting down 425 rw. In fact, I think it would be short-lived with even a 150 shot. 425 SAE is about 525 at the crank, and that's a lot of heat going into the pistons and rings even without any nitrous. I sure would love it if somebody could convice me that I'd be safe with a 150 hit on it.........heck, I'd be gunning for low 10's in this big sled!
Bone stock, I'd shoot a 150 shot till the cows come home.
I sure as heck wouldn't throw a 200 hit on the motor I'm running now - H/C putting down 425 rw. In fact, I think it would be short-lived with even a 150 shot. 425 SAE is about 525 at the crank, and that's a lot of heat going into the pistons and rings even without any nitrous. I sure would love it if somebody could convice me that I'd be safe with a 150 hit on it.........heck, I'd be gunning for low 10's in this big sled!
Obviously you wouldnt put a 200 on the motor your running now. Your already pushing the limits of what the stock shortblock can handle. Power is power no matter what it takes to get there, the parts don;t care, they are going to fail at some point... IN GENERAL YOU CAN SPRAY 50% OF THE MOTORS NA POWER ASLONG AS THE PARTS ARE BUILT FOR THAT SPECIFIC POWER LEVEL YOU WILL BE PUSHING LOL.
I'll grant that the 50% rule seems to apply well from a flow standpoint through the engine, kinda the discussion we were in when this thread started.
[QUOTE=OutlawZ;12803492]
How many dudes you know of with stock LT1's or mildly modified LT1's that are spraying 200 shots that kill their cars at the finish line and pull their plugs to read them??? Probably not many....
i do
. and its a good thing because my **** gets pretty lean on a 150 w/a 255lph fuel pump, at the kits suggested jetting. i would have fucked something up by now for sure, if i didnt notice that imeadiatly.
How many dudes you know of with stock LT1's or mildly modified LT1's that are spraying 200 shots that kill their cars at the finish line and pull their plugs to read them??? Probably not many....
i do
. and its a good thing because my **** gets pretty lean on a 150 w/a 255lph fuel pump, at the kits suggested jetting. i would have fucked something up by now for sure, if i didnt notice that imeadiatly.
i do . and its a good thing because my **** gets pretty lean on a 150 w/a 255lph fuel pump, at the kits suggested jetting. i would have fucked something up by now for sure, if i didnt notice that imeadiatly
Alot of ppl will use a wideband but a wideband is reading an average of all cylinders..... so if one is super fat and one is super lean they cancel each other out...
won't stop the piston from melting however..... read them plugs people, read them plugs...
