Uploaded August 2026 | Updated September 2026, 1 week ago
Turbo A/R test! Full dyno results! How much does a change in A/R (from .83 to 1.21) change boost response and power? We compared exactly that (and our G42) on a 5.3L on the chassis dyno in our Turbo Tahoe (junkyard 5.3L). The change in A/R from .83 to 1.21 changed boost response by 200 rpm. The bigger A/R made more peak power and lowered back pressure. We recommend the 1.21 to most LS owners (4.8L and 5.3L) as the RHiP800 is ultra responsive with the 1.21. The .83 can be used for people running lower boost levels (especially 4.8L owners). Our new RHiP800+ is even better (in every way) than the original tested here (more power, lower back pressure and slightly better response). If you have questions, make sure to join the nightly live feed that includes tech and 45 mins of Q&A-bring your build questions. Make sure to check out the new turbos (and sale pricing) @richardholdenerperformance We have two new turbos (are you listening 6.0L guys)? We have a super responsive, super powerful option for the bigger 6.0L guys and a Trick upgrade for our own RHiP800 that improved response, lowered back pressure and increased power. No one else has this turbo! We also have cams, lifters, springs, injectors, pumps, tunes, dod delete kits etc…Also check out @briantooleyracing @afr_heads @scatcrankshafts @vortechsuperchargers #turbo #boost #junkyard #ls
Turbo A/R test! Full dyno results! How much does a change in A/R (from .83 to 1.21) change boost response and power? We compared exactly that (and our G42) on a 5.3L on the chassis dyno in our Turbo Tahoe (junkyard 5.3L). The change in A/R from .83 to 1.21 changed boost response by 200 rpm. The bigger A/R made more peak power and lowered back pressure. We recommend the 1.21 to most LS owners (4.8L and 5.3L) as the RHiP800 is ultra responsive with the 1.21. The .83 can be used for people running lower boost levels (especially 4.8L owners). Our new RHiP800+ is even better (in every way) than the original tested here (more power, lower back pressure and slightly better response). If you have questions, make sure to join the nightly live feed that includes tech and 45 mins of Q&A-bring your build questions. Make sure to check out the new turbos (and sale pricing) @richardholdenerperformance We have two new turbos (are you listening 6.0L guys)? We have a super responsive, super powerful option for the bigger 6.0L guys and a Trick upgrade for our own RHiP800 that improved response, lowered back pressure and increased power. No one else has this turbo! We also have cams, lifters, springs, injectors, pumps, tunes, dod delete kits etc…Also check out @briantooleyracing @afr_heads @scatcrankshafts @vortechsuperchargers #turbo #boost #junkyard #ls
