TSP 383 dynoed today at RPM in NC
03-05-2017, 05:37 PM
#81
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Adequate airflow to support the 4" stroke of an LS 383 has always been an issue on those engines win the 3.9" bore.
I'd get the biggest CSA head I could get, MSD intake, 2" headers and 3" x pipe duals. Money no object id use mast ls3 small bores.
A 250cc head that flowed 300 would likely work better on this engine than a 220cc head that flowed 300.
I'd get the biggest CSA head I could get, MSD intake, 2" headers and 3" x pipe duals. Money no object id use mast ls3 small bores.
A 250cc head that flowed 300 would likely work better on this engine than a 220cc head that flowed 300.
03-06-2017, 01:20 PM
#82
I would agree, its not the ultimate starting point. But, if you already have a good ls1 block and money prohibits a different block, the 383 is better than most people on this site give it credit for and a decent set of heads will make power, I have less than desirable Darts and goes well for what it is. Iv'e gone 127mph through the traps.
03-07-2017, 11:27 PM
#83
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It's 534rwhp now. Mon the 6th I had some tune work done by its original tuner, between then and now I went to Dynomax bullets vs the Moroso spiral cores I had and went with a Holley EFI 105mm, I opened up the mouth of the Edelbrock ProFlo to eliminate any inward steps that would affect the air.
Jake, its Comp core LSL lobe 243-251@.050 112lsa .625 lift, it works well .
03-08-2017, 01:26 AM
#85
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530 rwhp is smoking for a 383 cube motor 
03-08-2017, 09:55 PM
#86
What was the SAE number there?
The 243/251 is an aggressive cam in a 383 but not insane. With Dart Pro 1s and Edelbrock Pro-Flow? The torque looks good with the Pro-Flow XT.
I've always liked a 240/248 in a 383 or if you want an interesting grind... 236/248 114+3 with a good amount of compression.
The 243/251 is an aggressive cam in a 383 but not insane. With Dart Pro 1s and Edelbrock Pro-Flow? The torque looks good with the Pro-Flow XT.
I've always liked a 240/248 in a 383 or if you want an interesting grind... 236/248 114+3 with a good amount of compression.
03-08-2017, 10:28 PM
#87
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What a monster! Congratulations man! Sexy torque curve too!!!
03-09-2017, 07:13 PM
#88
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Yeah, that is a bit much. My SAE. 518rwhp, 445ftlbs peak hp at 6400 on the nose and peak torque is at 5200 . I just like to show off the uncorrected numbers. My goal was to make 500rwhp, I kinda wish the torque # was closer to hp #. My next move is to try the LSXRT with the 105 TB.
03-09-2017, 10:53 PM
#90
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I Predict the LSXRT especially Ported will fatten the torque curve
everywhere, With little to no loss of HP, may even increase a bit.
The best NA Cathedral intake if you have the room for it.
everywhere, With little to no loss of HP, may even increase a bit.
The best NA Cathedral intake if you have the room for it.
03-10-2017, 06:18 PM
#91
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Originally Posted by 64post
Yeah, that is a bit much. My SAE. 518rwhp, 445ftlbs peak hp at 6400 on the nose and peak torque is at 5200 . I just like to show off the uncorrected numbers. My goal was to make 500rwhp, I kinda wish the torque # was closer to hp #. My next move is to try the LSXRT with the 105 TB.
03-10-2017, 10:14 PM
#92
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Compared to the car intake it will peak 3-500 RPM higher.
Ugly as sin but it would be a good contest with the MSD.
03-11-2017, 10:51 AM
#93
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Yes, it has a different length runner but the RT has higher runner angle so it's a bit more straight in vs. the R and that might be where the advantage is. When the Pro Flo was off a few weeks ago I laid the RT in the valley and it's going to take some relocating of things to swap it, it hits the funky Mustang firewall blade, that's a flange that sticks out so that will have be some cutting and shaping so the entire motor will have to wrapped and sealed. I just hope the results are worth the work.
03-11-2017, 11:44 AM
#94
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Shorter Runner.
Straighter Runner with line of sight to the intake valve.
Considerably larger Plenum Volume.
All 3 Factors will add considerably to your results from
3500 RPM all the way to 6800+.
Since you have already invested the time and expertise to
port the intake, I can't imagine you wouldn't install it.
Good Luck!
In for results.
Straighter Runner with line of sight to the intake valve.
Considerably larger Plenum Volume.
All 3 Factors will add considerably to your results from
3500 RPM all the way to 6800+.
Since you have already invested the time and expertise to
port the intake, I can't imagine you wouldn't install it.
Good Luck!
In for results.
03-11-2017, 12:10 PM
#95
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Originally Posted by NAVYBLUE210
Shorter Runner.
Straighter Runner with line of sight to the intake valve.
Considerably larger Plenum Volume.
All 3 Factors will add considerably to your results from
3500 RPM all the way to 6800+.
Since you have already invested the time and expertise to
port the intake, I can't imagine you wouldn't install it.
Good Luck!
In for results.
Straighter Runner with line of sight to the intake valve.
Considerably larger Plenum Volume.
All 3 Factors will add considerably to your results from
3500 RPM all the way to 6800+.
Since you have already invested the time and expertise to
port the intake, I can't imagine you wouldn't install it.
Good Luck!
In for results.
Remember I'm the guy who has tested the ported MSD vs the ported lsxr on the same 346 mill. From 3500-6000 the lsxr has the clear advantage. The MSD did flatten and broaden tbectorque curve which was why I left it on vs the fast.
And I think the 4" stroke is going to somewhat resist moving that peak much higher.
