388 finally hits the dyno
07-23-2017, 11:16 AM
#122
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.
Put a single plane manifold, a head that flows big #'s at high lift, a cam that you can spin, redesign your drive train with the minimization of parasitic loss in mind. All that "under the curve power" ls1tech loves so much is Bullshit does not work on the track.
What OP is doing is nothing different then others have done, there are a couple other guys who have gone 130+ mph with cam only 6 liter stuff.
Last edited by adamantium; 07-23-2017 at 11:23 AM.
07-23-2017, 11:34 AM
#123
11 Second Club
Cause no one in South Florida knows what they're doing when it comes to N/A LS stuff. I know 1 guy who does and he had a 4xxci GTO that went 135+mph N.A and he isn't even an LS guy.
Put a single plane manifold, a head that flows big #'s at high lift, a cam that you can spin, redesign your drive train with the minimization of parasitic loss in mind. All that "under the curve power" ls1tech loves so much is Bullshit does not work on the track.
Put a single plane manifold, a head that flows big #'s at high lift, a cam that you can spin, redesign your drive train with the minimization of parasitic loss in mind. All that "under the curve power" ls1tech loves so much is Bullshit does not work on the track.
07-23-2017, 11:36 AM
#124
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Power under the curve isn't bullshit imo. But i agree it is used wrong. There is a TON of power past peak that doesn't get used. Most often I see people shifting at or just past peak and leaving all the delicious power unused and talking about power under the curve - when they're really using torque under the curve.
Power under curve has a lot to do with your shift points.
Power under curve has a lot to do with your shift points.
07-23-2017, 11:50 AM
#125
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Mine is not the world's worst matching of parts, but thanks. I dynoed it once a long time ago and it peaked at 6,100 or 6,200. I shift at 6,600 to 6,700. It has 3.73 gears, 26" tires. Usually anything over 3,000 rpm on a launch launch it will spin. On that run I didn't spin or bog too much.
07-23-2017, 11:50 AM
#126
Power under the curve isn't bullshit imo. But i agree it is used wrong. There is a TON of power past peak that doesn't get used. Most often I see people shifting at or just past peak and leaving all the delicious power unused and talking about power under the curve - when they're really using torque under the curve.
Power under curve has a lot to do with your shift points.
Power under curve has a lot to do with your shift points.
If you build a motor to make power before 7k RPM you're just taking a big cube motor that CAN go fast and making it slow. You're putting a small cam in it, and using a lift and or range of the head that doesn't flow, which is idiotic cause at the drag strip you're never in that portion of the RPM band, you're at redline. Look at all the basic cam only stuff that is going 130+ They all spin their motors, all use a big cam that utilizes where the heads flow most.
Ive been into LS stuff since before i joined here and ive lived in miami all my life, i dont know how many guys i know who have **** f-bodys with H/C/I that trap sub 120 mph. The guy im talking about is david he is a tuner, im sure you've heard of KT tuning? that GTO was built before i even knew anything about LS stuff. He is the only guy i know who had a fast and heavy N.A LS car down here. Now his dad has a H/C LS3 vette that goes 128-130 mph.
07-23-2017, 12:02 PM
#131
11 Second Club
Ive been into LS stuff since before i joined here and ive lived in miami all my life, i dont know how many guys i know who have **** f-bodys with H/C/I that trap sub 120 mph. The guy im talking about is david he is a tuner, im sure you've heard of KT tuning? that GTO was built before i even knew anything about LS stuff. He is the only guy i know who had a fast and heavy N.A LS car down here. Now his dad has a H/C LS3 vette that goes 128-130 mph.
No I have not heard of KT tuning.
What car are you running right now?
07-23-2017, 12:06 PM
#134
11 Second Club
Do you know of any fast n/a ls cars now? 4th gen f-body.
07-23-2017, 12:08 PM
#135
At the moment dedicated NA cars, not really. His dads grand sport runs awesome for how basic it is. So many TSP h/c packages here, and they all run the same. Most guys here just turbo their stuff and skip the NA stuff. Id love to build a solid roller NA car but for $ to performance its not worth it.
07-23-2017, 12:09 PM
#136
11 Second Club
07-23-2017, 12:14 PM
#137
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At the moment dedicated NA cars, not really. His dads grand sport runs awesome for how basic it is. So many TSP h/c packages here, and they all run the same. Most guys here just turbo their stuff and skip the NA stuff. Id love to build a solid roller NA car but for $ to performance its not worth it.
Well if you find a good n/a 4th gen let me know. My buddy has one that runs like ****. I'll see how it's doing right now. I'm at PBIR a lot. Maybe a grudge run or two?
07-23-2017, 12:23 PM
#138
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Originally Posted by adamantium
The problem is you're putting a lid on performance, building a burn out machine or weekend cruiser that sounds cool in a parking lot. Okay, under the curve stuff is relevant in those situations.
If you build a motor to make power before 7k RPM you're just taking a big cube motor that CAN go fast and making it slow. You're putting a small cam in it, and using a lift and or range of the head that doesn't flow, which is idiotic cause at the drag strip you're never in that portion of the RPM band, you're at redline. Look at all the basic cam only stuff that is going 130+ They all spin their motors, all use a big cam that utilizes where the heads flow most.Ive been into LS stuff since before i joined here and ive lived in miami all my life, i dont know how many guys i know who have **** f-bodys with H/C/I that trap sub 120 mph. The guy im talking about is david he is a tuner, im sure you've heard of KT tuning? that GTO was built before i even knew anything about LS stuff. He is the only guy i know who had a fast and heavy N.A LS car down here. Now his dad has a H/C LS3 vette that goes 128-130 mph.
If you build a motor to make power before 7k RPM you're just taking a big cube motor that CAN go fast and making it slow. You're putting a small cam in it, and using a lift and or range of the head that doesn't flow, which is idiotic cause at the drag strip you're never in that portion of the RPM band, you're at redline. Look at all the basic cam only stuff that is going 130+ They all spin their motors, all use a big cam that utilizes where the heads flow most.Ive been into LS stuff since before i joined here and ive lived in miami all my life, i dont know how many guys i know who have **** f-bodys with H/C/I that trap sub 120 mph. The guy im talking about is david he is a tuner, im sure you've heard of KT tuning? that GTO was built before i even knew anything about LS stuff. He is the only guy i know who had a fast and heavy N.A LS car down here. Now his dad has a H/C LS3 vette that goes 128-130 mph.
Most people talk power under curve but they really mean torque under curve. I don't. I mean spinning the engine well past peak until you no longer see a drop in rear wheel torque due to gear multiplication
My engine as an example. I shift at 6800, I drop to 4550 rpm, which drops from 4373 wheel torque to 3000 after gear multiplication. Average hp about 430 between those points.
I shift at 7400, I drop to 4950 rpm, which drops wheel torque from 3957 to 3145 after gear multiplication. Average hp about 475 between those two points. Honestly I should shift at 7700, but stock bottom end.
Car is ALWAYS faster shifting higher. And since shifting at 7400 makes more average power, that's more power under the curve. I really think we are saying the same thing.
07-23-2017, 01:21 PM
#140
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.