new ls1 383 stroker built ready to start on car help with tuning

[carlitos2012]

hi everyone
i just finished my new build, is 5.3, l33 aluminum block, stroke to 383 using tsp 383 stroker kit, piston -3cc dome
heads 706, mill to 0.20, valves intake 2.02 exhaust 1.60, port and polish 220cc intake 80cc exhaust.
cam tsp 233 intake 239 exhaust 600 lift 112, lsa injectors #42s

put the engine in the car but when i tried to start it sounded like it off timing?
crank but no start
I'm using my old tune for ls1 bolt on tuning
do i need to change cylinder volume, timing?
​​​​​​​I have hp tuners and I'm learning.
any help appreciated. thank you

Car is 1998 Pontiac trans am

[bk2life]

hi everyone
do i need to change

Yes it all needs to be changed.
Do yourself a HUGE favor and put it on a trailer and tow it to a dyno tuner.
Let them get it set up, thats what they are paid for, and then when you bring it home, you can learn how to dial in everything else for everyday driving.
I would not risk putting holes in my pistons to learn on my brand new expensive engine.

[carlitos2012]

ok thank you
anyone else with experience on tuning ls1 383 stroker?

[reubone]

Hello there yes a lot of us have plenty of experience tuning. Post your tune and log files so we know how to help you.

[Alvin]

hi everyone
i just finished my new build, is 5.3, l33 aluminum block, stroke to 383 using tsp 383 stroker kit, piston -3cc dome
heads 706, mill to 0.20, valves intake 2.02 exhaust 1.60, port and polish 220cc intake 80cc exhaust.
cam tsp 233 intake 239 exhaust 600 lift 112, lsa injectors #42s

put the engine in the car but when i tried to start it sounded like it off timing?
crank but no start
I'm using my old tune for ls1 bolt on tuning
do i need to change cylinder volume, timing?
​​​​​​​I have hp tuners and I'm learning.
any help appreciated. thank you

Car is 1998 Pontiac trans am

That should run. I wonder if you got the cam off a tooth or something. It will not run great but it should run.

[carlitos2012]

thank you guys
cam was dot to dot. here is my tune file, remember is the bolt on tune for my ls1 5.7
now i need for 383 build.
car is 1998 trans am
all ready input my injector data for #42 but you guys can check everything for me. thanks in advance new engine start up tune.hpt

[blindsquirrel]

Ah, no. This is not right. I can tell you that even without knowing what "42lb" injectors you used.

screenshot.29-03-2023 15.59.00.png

[blindsquirrel]

Injector part number, fuel system type (returnless or referenced), base fuel pressure.

[carlitos2012]

injectors are original resizes to #42 from injector connection. the data the i input was provided by then
two 340s racetronix fuel pump
return system 8an fuel line
fuel pressure 58 440ccHPT_Plug_and_Play_Data_FIC_42_GreenGiant_0280155968_GMONLY.xlsx

[blindsquirrel]

A referenced return-type system uses only the 0 kPa column from the datasheet, all the way across all columns from left to right.

screenshot.29-03-2023 16.48.36.png

new engine start up tune - correct injector data.hpt

[carlitos2012]

all right, thank you
i give it a shot

[carlitos2012]

i try it but still sounds like timing is to advance!!!

[blindsquirrel]

Why is cylinder volume still 708.21cm3?

[carlitos2012]

thank you
you all , thank you blindsquirrel, but as soon i get the chance , I'm going to disassemble the front cover to check my timing marks.