385 vs 415 with same top end dyno graphs
385 vs 415 with same top end dyno graphs 
This is the dyno graph for the 415 ci bottom end vs the previous 385 that was in there. No changes besides the actual bottom end. The 418 had about 50 miles on the clock when it was strrapped down. I will be redynoing soon to recheck a few small changes. To me it peaks very early especially with the size of the cam in there. I may retard the cam 2 degrees and see what that does.
Or I may have Futral grind another cam for the 415 since this one was actually specially ground for the 385. The cam is a nitrous cam so its not an all out NA setup and the exhaust ports are made with juice in mind. Ihave a feeling it will come alive even on a little bitty 150 shot.
I like the low 6200 peak..
Your NEVER EVER hurt that motor and u can shift it at 6400..
What are u going to pick up 15RW and have to buzz it another 600rpm?
Leave it along and spary the poo out of it
Your NEVER EVER hurt that motor and u can shift it at 6400..
What are u going to pick up 15RW and have to buzz it another 600rpm?
Leave it along and spary the poo out of it
this is not strictly a street motor. There are avantages to spinning the motor a lil higher and gearing accordingly. One thing the dyno doesnt show for some reason is we actually spun it to 7600 and 7500 on some runs. It has a definate peak but doesnt fall off too much as rpm increases.
If you can launch with 4.11 or 4.56 gears but spin to 7500 and still trap 150+ thats a major positive. I dont want it to peak at 7500 but I do think there is more to be had with the 415 by either retarding the cam or having another ground.
I am also going to try a few things on the dyno. The valve lash is set fairly loose right now. I am going to tighten up on the intake side about .008 and go as loose as I can on the exhaust. That will effectively lessen the overlap and may do better at retain some cylinder pressure since this is a large cam with alot of exhaust duration.
I also need to complete the cleanup of the FAST intake. I also noticed the FAST did not line up well with the intake ports and that it lined up much better when pushed either all the way fwd or all the way back (cant remember) and the tightened down. I forgot to do this when I put it on. The difference was as much as 1/8 inch one way and pretty much aligned the other way.
The compression ratio on the 385 was ~ 11.5 to 1 and the 415 was ~12 to 1
If you can launch with 4.11 or 4.56 gears but spin to 7500 and still trap 150+ thats a major positive. I dont want it to peak at 7500 but I do think there is more to be had with the 415 by either retarding the cam or having another ground.
I am also going to try a few things on the dyno. The valve lash is set fairly loose right now. I am going to tighten up on the intake side about .008 and go as loose as I can on the exhaust. That will effectively lessen the overlap and may do better at retain some cylinder pressure since this is a large cam with alot of exhaust duration.
I also need to complete the cleanup of the FAST intake. I also noticed the FAST did not line up well with the intake ports and that it lined up much better when pushed either all the way fwd or all the way back (cant remember) and the tightened down. I forgot to do this when I put it on. The difference was as much as 1/8 inch one way and pretty much aligned the other way.
The compression ratio on the 385 was ~ 11.5 to 1 and the 415 was ~12 to 1
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Originally Posted by JS
I like the low 6200 peak..
Your NEVER EVER hurt that motor and u can shift it at 6400..
What are u going to pick up 15RW and have to buzz it another 600rpm?
Leave it along and spary the poo out of it
Your NEVER EVER hurt that motor and u can shift it at 6400..
What are u going to pick up 15RW and have to buzz it another 600rpm?
Leave it along and spary the poo out of it
Dont worry I will be spraying the POOOO out of this ****** soon. I just finally got my Altronics 8 EGT datalogger working correctly. Now I can graph each cylinder during a run. I believe this will help reach for the very LARGE shots and stay safe. Also will have the FJO wideband interfaced with the Maximizer II. Either the Altronics EGT or the FJO wideband can shutdown the juice.
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383... can you try running a good bit less rocker ratio on the exhaust valve?
When you get the 8 channel ran on the bottle a few times, mind shooting me a pm with the cyls that seem to run the hottest?
When you get the 8 channel ran on the bottle a few times, mind shooting me a pm with the cyls that seem to run the hottest?
I will be posting the results and screen shots of the graphed egts per cylinder when I dyno on motor and with juice. The juice info may not help you because it will be direct port and the differences likely will be specific to my setup only.
TECH Junkie
Joined: May 2003
Posts: 3,050
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From: its fucking cold
Originally Posted by 383LQ4SS
Gator...all you did was drink beer and tell stories
Very nice numbers man....can't wait to see what a different cam, few more RPM, and a big shot will do with that sucker.
I ran an 8 bungs in my 383 LT1 car with 8 Comptechs..It was a PITA and crude back then,we used the Accel injector driver kit back then (98) to synxc evey cyl in perfectly on the juice...Your very smart in taking your time and dialing this setup in and I can tell u the reward will be NO ENGINE damage...I sprayed countless 200HP dry shots threw my LT1 and never so much as a hicuup ever happened...
Good luck with the setup..
U did a great job with your car
Good luck with the setup..
U did a great job with your car
Last edited by JS; Jul 28, 2005 at 12:07 PM.
