Lt1 turbo build. Does 383... reusing forged....2 bar sensor
05-12-2010, 08:34 PM
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Lt1 turbo build. Does 383... reusing forged....2 bar sensor I am planning a turbo engine build. But got some questions. I plan on going past 15lbs of boost and am curious if a 383 engine will boost faster compared to a 355 causing you not to have to go as high in rpms? The reason I ask is if I use the stock pcm, I know I'm not suppose to go past 7,000rpms because the tuning is supposedly a guessing game after that.
Also I already have forged internals with my 355? So if I was to decide to reuse my 355 and change to low compression pistons. Can an engine builder really tell if my forged rods and crank are fine? Or do I definantly need to get new ones? They have 25000 miles on them and I have only about 15 track passes and I have never street raced.
Also I'm pretty sure I am suppose to go speed density. I have a 96 LT1 pcm where do I get the 2 bar sensor from?
Also I already have forged internals with my 355? So if I was to decide to reuse my 355 and change to low compression pistons. Can an engine builder really tell if my forged rods and crank are fine? Or do I definantly need to get new ones? They have 25000 miles on them and I have only about 15 track passes and I have never street raced.
Also I'm pretty sure I am suppose to go speed density. I have a 96 LT1 pcm where do I get the 2 bar sensor from?
05-12-2010, 11:12 PM
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Well, you cant use your 355 crank in a 383. You build a 383 by using a longer stroke to build the extra inches. Secondly, there are several different combinations of pistons and rods that still all equal a 383.
Any shop should be able to tell easily if your parts are good enough to use. You can reuse your pistons with a new crank and the correct rod.
2 bar map sensors are available all over pretty much, you just need to decide which style you want. The oem style is basically a turbo buick map. 86-87 gn.
Im just putting one together for my impala. Its a 3.75 stroke (383) with 5.7 rods. I m unsure still on the pcm. I might just go to a gen 7 (lt1 compatable).
Im running a 220-230 cam, 76 mm turbo, modded stealth ram intake, my own turbo kit.
Any shop should be able to tell easily if your parts are good enough to use. You can reuse your pistons with a new crank and the correct rod.
2 bar map sensors are available all over pretty much, you just need to decide which style you want. The oem style is basically a turbo buick map. 86-87 gn.
Im just putting one together for my impala. Its a 3.75 stroke (383) with 5.7 rods. I m unsure still on the pcm. I might just go to a gen 7 (lt1 compatable).
Im running a 220-230 cam, 76 mm turbo, modded stealth ram intake, my own turbo kit.
05-13-2010, 12:53 AM
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Just leave it 355, for the amount of money it will cost for a new crank then balancing. My 383 LT1 with LE2s and a turbo comp specd cam made 583rwhp/490wtq on 8psi through a TH400! I tried the 2 bar thing but its alot of hours of messing around, I would say if your car is running now, get it running on the 2 bar tune good then when you do the turbo build up you will at least have a base line.
Mine was a 230/236 .544/.555 114lsa with a T6 74mm
Jay
Mine was a 230/236 .544/.555 114lsa with a T6 74mm
Jay
05-13-2010, 06:49 AM
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Well, you cant use your 355 crank in a 383. You build a 383 by using a longer stroke to build the extra inches. Secondly, there are several different combinations of pistons and rods that still all equal a 383.
Any shop should be able to tell easily if your parts are good enough to use. You can reuse your pistons with a new crank and the correct rod.
2 bar map sensors are available all over pretty much, you just need to decide which style you want. The oem style is basically a turbo buick map. 86-87 gn.
Im just putting one together for my impala. Its a 3.75 stroke (383) with 5.7 rods. I m unsure still on the pcm. I might just go to a gen 7 (lt1 compatable).
Im running a 220-230 cam, 76 mm turbo, modded stealth ram intake, my own turbo kit.
Any shop should be able to tell easily if your parts are good enough to use. You can reuse your pistons with a new crank and the correct rod.
2 bar map sensors are available all over pretty much, you just need to decide which style you want. The oem style is basically a turbo buick map. 86-87 gn.
Im just putting one together for my impala. Its a 3.75 stroke (383) with 5.7 rods. I m unsure still on the pcm. I might just go to a gen 7 (lt1 compatable).
Im running a 220-230 cam, 76 mm turbo, modded stealth ram intake, my own turbo kit.
