my dyno results
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TECH Apprentice
Joined: Feb 2010
Posts: 319
Likes: 0
my cam is a comp cam and its close to a lt4 hotcam. the heads are not very good ported they didnt mess with anything around the guides. and my tranny feels good but i think i have a weak stall.
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I'd think with boltons and a hot cam you would be a little closer to 300. Kinda seems to be the norm with boltons and a small cam in these things to be between 290-330 somewhere.
TECH Fanatic
Joined: Jun 2007
Posts: 1,255
Likes: 11
From: centerville, ohio
I put down 309 rwhp, 336 tq with bolt-ons. The Hotcam with ported heads should be in the 350-360 rwhp range. The tune or something is way off or the dyno is incorrect. Take it to the track, you should easily run low 12's.
Easily run low 12s is a far stretch. If your running low 12s in a 3500lb car, your putting down 380-410hp. I know a lot of variables go into the equation other than HP, but I'd be happy to run 13.0s with a stock bottom end and ported heads. I'm aiming for low-to-mid 12s in my 383 w/CC280xfi, ported heads, 11.5 compression, with all the bolt ons, 3.73 gears, etc. If he can easily run low 12s, then I should be easily running high 10s, so I hope you're right, but I just can't see it.
Mild HOT-camish and ported heads should be in the 12s.
If you only get low to mid 12s out of a 383 with that XFI cam and ported heads in an f-body your build is the definition of a failure. Heads/cam junkyard shortblock 4200lbs b-body can run 11s with less cam, with 3.73s, 11.2:1 compression, mechanical waterpump.
A hydraulic roller 383 with ported GM heads can do high 10s, your's won't but it can and has been done, heck there is even a heads/cam stock shortblock Impala in the high 10s.
People use mediocre parts and set the bar low and then refuse to believe in what actually works well.
Far as the original poster's issue, run it at the track, maybe the dyno is just wrong, such a setup should be making more power than that though.
If you only get low to mid 12s out of a 383 with that XFI cam and ported heads in an f-body your build is the definition of a failure. Heads/cam junkyard shortblock 4200lbs b-body can run 11s with less cam, with 3.73s, 11.2:1 compression, mechanical waterpump.
A hydraulic roller 383 with ported GM heads can do high 10s, your's won't but it can and has been done, heck there is even a heads/cam stock shortblock Impala in the high 10s.
People use mediocre parts and set the bar low and then refuse to believe in what actually works well.
Far as the original poster's issue, run it at the track, maybe the dyno is just wrong, such a setup should be making more power than that though.
TECH Fanatic
Joined: Jun 2007
Posts: 1,255
Likes: 11
From: centerville, ohio
Easily run low 12s is a far stretch. If your running low 12s in a 3500lb car, your putting down 380-410hp. I know a lot of variables go into the equation other than HP, but I'd be happy to run 13.0s with a stock bottom end and ported heads. I'm aiming for low-to-mid 12s in my 383 w/CC280xfi, ported heads, 11.5 compression, with all the bolt ons, 3.73 gears, etc. If he can easily run low 12s, then I should be easily running high 10s, so I hope you're right, but I just can't see it.
Mild HOT-camish and ported heads should be in the 12s.
If you only get low to mid 12s out of a 383 with that XFI cam and ported heads in an f-body your build is the definition of a failure. Heads/cam junkyard shortblock 4200lbs b-body can run 11s with less cam, with 3.73s, 11.2:1 compression, mechanical waterpump.
A hydraulic roller 383 with ported GM heads can do high 10s, your's won't but it can and has been done, heck there is even a heads/cam stock shortblock Impala in the high 10s.
People use mediocre parts and set the bar low and then refuse to believe in what actually works well.
Far as the original poster's issue, run it at the track, maybe the dyno is just wrong, such a setup should be making more power than that though.
If you only get low to mid 12s out of a 383 with that XFI cam and ported heads in an f-body your build is the definition of a failure. Heads/cam junkyard shortblock 4200lbs b-body can run 11s with less cam, with 3.73s, 11.2:1 compression, mechanical waterpump.
A hydraulic roller 383 with ported GM heads can do high 10s, your's won't but it can and has been done, heck there is even a heads/cam stock shortblock Impala in the high 10s.
People use mediocre parts and set the bar low and then refuse to believe in what actually works well.
Far as the original poster's issue, run it at the track, maybe the dyno is just wrong, such a setup should be making more power than that though.
I said I'm aiming for low 12s. I don't want to expect 11s, then get disappointed. I'd rather lower my expections and be excited when I surpass them. Sure you can run low 12s on a hotcam or similar, but should everyone expect to? I just didn't want the OP to get dissappointed when he went to the track like he did at the dyno. Everyone sees a cam and says "you should run x.xx with that cam", but the truth is that there are so many variables that go into your ET that all you can really say is what's possible, not what's probable.
If someone buys an LT1 car these days, they're looking for cheap American muscle. Not many other American made V8 cars in good running condition for the price of LT1s. Then they see a cam is only $300 or so. Then they learn about the supporting costs that go with it. That $300 cam just turned into $600-800 or more. Intake, exhaust, tune and you're past $1,000. Then you get on a site like this and realize that it takes thousands of dollars to build what you really want, so you piece meal it and get impatient and just throw it together and of course **** breaks and doesn't meet your expectations. But it's still fun and I'm enjoying the hobby, even if my build meets your definition of failure.