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cmitchell17 · 08-01-2020, 01:00 PM

The first thing I am trying to do is recreate a stock LT1 but I am short on numbers and they are coming in about 1000 rpm lower than what they should be. I have the newest J1349 version 6 SAE standard correction factor applied:
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Name: Capture.JPG
Views: 173
Size: 199.2 KB

I am missing some specs however and I have no way of knowing how to find them. I pulled stock head flow data from a WCRCH's article on LT1 porting, I got the total 87mm LT1 throttle body from at 916 cfm @ 1.5 mmhg, I know the @.050 durations for the stock cam but not seat to seat so I put in the @.050 durations and moved the seat to seat up and down until DynoSim said it was a "OEM style" ramp rate. I am using the DynoSim generic "Hp manifolds with cat":
Attachment 1039609

Also not sure, I need to read up, but I am assuming DynoSim is just giving engine power with no accessory losses, so in theory power I get out should be more than the SAE 455 rating.

08-01-2020, 01:00 PM	#1
cmitchell17 Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016 Location: US Posts: 1,213	Experimenting with DynoSim The first thing I am trying to do is recreate a stock LT1 but I am short on numbers and they are coming in about 1000 rpm lower than what they should be. I have the newest J1349 version 6 SAE standard correction factor applied: I am missing some specs however and I have no way of knowing how to find them. I pulled stock head flow data from a WCRCH's article on LT1 porting, I got the total 87mm LT1 throttle body from at 916 cfm @ 1.5 mmhg, I know the @.050 durations for the stock cam but not seat to seat so I put in the @.050 durations and moved the seat to seat up and down until DynoSim said it was a "OEM style" ramp rate. I am using the DynoSim generic "Hp manifolds with cat": Attachment 1039609 Also not sure, I need to read up, but I am assuming DynoSim is just giving engine power with no accessory losses, so in theory power I get out should be more than the SAE 455 rating.