388 finally hits the dyno
Have you put any thought into doing a custom made 4" intake w/ velocity stack?
https://ls1tech.com/forums/generatio...ke-system.html
https://ls1tech.com/forums/generatio...ke-system.html
Why would he use a 4" tube od when the id of his tb is larger than that? Then drag it through 2-3ft of tubing. Nothing about that sounds efficient. Now it might be better than a lid set up but that's really not saying much.
I have a solution for him
I have a solution for him
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I don't get how this motor can run so much better than everyone else. Are there any 427, 434 or 441 ci motors running a fast intake in a non race f-body running close to this. I don't care what they dyno. I have a 427 w/ 235 tfs heads that pretty much sucks compared to this. My 60 foots are bad but it doesn't make that much difference. Two weeks ago I was at the track in south florida and after a long cool down ran 11.27 at 128.9 with a 1.89 60 foot. My race weight is 3,650-3,700 and I have a 6 spd.
I don't get how this motor can run so much better than everyone else. Are there any 427, 434 or 441 ci motors running a fast intake in a non race f-body running close to this. I don't care what they dyno. I have a 427 w/ 235 tfs heads that pretty much sucks compared to this. My 60 foots are bad but it doesn't make that much difference. Two weeks ago I was at the track in south florida and after a long cool down ran 11.27 at 128.9 with a 1.89 60 foot. My race weight is 3,650-3,700 and I have a 6 spd.
Originally Posted by Bill00Formula
I don't get how this motor can run so much better than everyone else. Are there any 427, 434 or 441 ci motors running a fast intake in a non race f-body running close to this. I don't care what they dyno. I have a 427 w/ 235 tfs heads that pretty much sucks compared to this. My 60 foots are bad but it doesn't make that much difference. Two weeks ago I was at the track in south florida and after a long cool down ran 11.27 at 128.9 with a 1.89 60 foot. My race weight is 3,650-3,700 and I have a 6 spd.
I don't get how this motor can run so much better than everyone else. Are there any 427, 434 or 441 ci motors running a fast intake in a non race f-body running close to this. I don't care what they dyno. I have a 427 w/ 235 tfs heads that pretty much sucks compared to this. My 60 foots are bad but it doesn't make that much difference. Two weeks ago I was at the track in south florida and after a long cool down ran 11.27 at 128.9 with a 1.89 60 foot. My race weight is 3,650-3,700 and I have a 6 spd.
Thread Starter
10 Second Club
Joined: May 2009
Posts: 3,427
Likes: 227
From: over dere
235's are good heads, but I just wouldn't use them on a 427. Doesn't necessarily make me right I suppose just a personal preference.
Some of these higher flowing cathedrals are darn good heads in their own right BUT I think fast intakes really limit them... a ported. Fast 102 flows maybe 290 cfm so it may limit a guy to the 530-540 rwhp range. Which is still decent but not what the heads are capable of. Just throwing some theories out there
Also the runner harmonics of a cathedral fast just aren't right for making really good hp over 6500 rpm. Seems like if you can get your TQ curve to stay pretty flat up top while continuing to climb in RPM that's when hp really starts to build
Some of these higher flowing cathedrals are darn good heads in their own right BUT I think fast intakes really limit them... a ported. Fast 102 flows maybe 290 cfm so it may limit a guy to the 530-540 rwhp range. Which is still decent but not what the heads are capable of. Just throwing some theories out there
Also the runner harmonics of a cathedral fast just aren't right for making really good hp over 6500 rpm. Seems like if you can get your TQ curve to stay pretty flat up top while continuing to climb in RPM that's when hp really starts to build
I don't get how this motor can run so much better than everyone else. Are there any 427, 434 or 441 ci motors running a fast intake in a non race f-body running close to this. I don't care what they dyno. I have a 427 w/ 235 tfs heads that pretty much sucks compared to this. My 60 foots are bad but it doesn't make that much difference. Two weeks ago I was at the track in south florida and after a long cool down ran 11.27 at 128.9 with a 1.89 60 foot. My race weight is 3,650-3,700 and I have a 6 spd.
I don't get how this motor can run so much better than everyone else. Are there any 427, 434 or 441 ci motors running a fast intake in a non race f-body running close to this. I don't care what they dyno. I have a 427 w/ 235 tfs heads that pretty much sucks compared to this. My 60 foots are bad but it doesn't make that much difference. Two weeks ago I was at the track in south florida and after a long cool down ran 11.27 at 128.9 with a 1.89 60 foot. My race weight is 3,650-3,700 and I have a 6 spd.
As for those 60' times, I would have to assume you are either spinning, have the wrong rear gear, or something goofy in your combo.
11 Second Club
Joined: Mar 2012
Posts: 1,541
Likes: 15
From: South Florida
I don't get how this motor can run so much better than everyone else. Are there any 427, 434 or 441 ci motors running a fast intake in a non race f-body running close to this. I don't care what they dyno. I have a 427 w/ 235 tfs heads that pretty much sucks compared to this. My 60 foots are bad but it doesn't make that much difference. Two weeks ago I was at the track in south florida and after a long cool down ran 11.27 at 128.9 with a 1.89 60 foot. My race weight is 3,650-3,700 and I have a 6 spd.
Don't get too discouraged. Your car runs good for what it is. As I don't know exactly, what is your best run down the 1/4? Your car is full weight. Hammers car is not. Just a couple differences to spot between you & hammers engine combos:
-You do have more ci, 427-388, but you guys have the same piston size. 4.125"
-Your motor is running on a non-ported fast 92. hammer has the medium runner fast102.
-You have 1-7/8 headers, hammer 2'' headers
-hammer has a solid roller cam, your still on a hydraulic roller.
-You make all your power under 7krpm, hammer is spinning close to 8krpm
-Along with the different weight, gearing, etc.
Also that it's summer down here. Nobody is going to run great times/mph in this crap air we have now. A 50mph tail wind helps a bit also
For what your car is, & what it runs, I've always respected your car. I don't see many N/A street cars getting 130+ traps. Your car is the fastest N/A f-body I see at the track. Your car runs good.
Regards
Originally Posted by big hammer
235's are good heads, but I just wouldn't use them on a 427. Doesn't necessarily make me right I suppose just a personal preference.
Some of these higher flowing cathedrals are darn good heads in their own right BUT I think fast intakes really limit them... a ported. Fast 102 flows maybe 290 cfm so it may limit a guy to the 530-540 rwhp range. Which is still decent but not what the heads are capable of. Just throwing some theories out there
Also the runner harmonics of a cathedral fast just aren't right for making really good hp over 6500 rpm. Seems like if you can get your TQ curve to stay pretty flat up top while continuing to climb in RPM that's when hp really starts to build
Some of these higher flowing cathedrals are darn good heads in their own right BUT I think fast intakes really limit them... a ported. Fast 102 flows maybe 290 cfm so it may limit a guy to the 530-540 rwhp range. Which is still decent but not what the heads are capable of. Just throwing some theories out there
Also the runner harmonics of a cathedral fast just aren't right for making really good hp over 6500 rpm. Seems like if you can get your TQ curve to stay pretty flat up top while continuing to climb in RPM that's when hp really starts to build
You've got two options for hp. Either your peak tq is moved higher in rpm or your curve is wide and flat. You won't do it with long runners unless you try to cheat it higher with a camshaft, in which case it peaks and falls fast.
The benefit of long runners is air momentum. So the cylinder continues to fill even as the piston is on its way back up. Kind of a weird way to see it but g/cyl is tq. G/sec is HP. After you hit peak tq, your torque falls, but hp still increases. Because you're getting more cylinder fills per minute, even if they're slightly less efficient in terms of g/cyl.
At high rpm, you don't need air momentum. You need airFLOW. So now, breathe through a straw. Cut the straw in half, and it's easier to breathe. Go to a bigger diameter straw it's even more easier to breathe. The heads can almost always outflow the intake. Intake is a straw the engine has to breathe through.
Now, take your heads. The runners on the heads are themselves straws. However you can't make them shorter. You CAN make them wider.
Hammer did a tremendous job matching the heads, intake, and cam to his intended rpm range. Also, hammer is a great driver. Knows his shift points, knows how to work a car. Very often I see guys shifting at 6500, because that's peak power. There is so much power past peak not being used when you do that. Hammers peak hp was around 6800 rpm, so he's probably shifting at 7500 or so. Maybe higher. With a solid valvetrain, he can safely rev much higher.