I'm not exactly sure what it is either. We used to say up to 20% drivetrain loss with an auto trans.
My L99 cranked off an amazing 315rwhp stock in July heat, seemed low to me but the car did go 13.1@106 stock and the 106mph seemed decent to me.
I did 368rwhp with exhaust, cai, tune, ud, went up to 112mph, so it would appear I make over 400 crank hp to propel a 4170 raceweight car down the track.
PROJECT HEAVY CHEVY: 2010 Camaro SS/RS |1SS | L99 | CGM
13.15@106 1.95 | Stock
12.06@110 1.70 | Bolt-Ons
Mods: Rhino Tune | Kooks Headers + Cats | Circle D 3200 | New Era OTR | RCR Ported Intake | 305/45R18 NT05R | Moroso Spiral Flows | LSR Suspension | Powerbond UDP
LSX Record List: http://motorhed.com/xf/threads/lsx-r...the-list.6022/