pump gas truck 8.5 DCR OR DCR Including Elevation
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
so im looking at a ls1 (5.7) street truck app dangerously close to 8.5 DCR.
Question is can i include elevation in my calculations and go off that to see what i can get by with???
the initial combo looks like this 4,700 lbs DCR 8.46:1 and 8.32:1 at elevation .
if i can just go off 8.32 i can breathe a little easier.
thoughts on minimum grades of gas?
thanks Tim
Question is can i include elevation in my calculations and go off that to see what i can get by with???
the initial combo looks like this 4,700 lbs DCR 8.46:1 and 8.32:1 at elevation .
if i can just go off 8.32 i can breathe a little easier.
thoughts on minimum grades of gas?
thanks Tim
Last edited by jeepfun_tj; 12-24-2022 at 01:36 PM.
#2
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
so im looking at a ls1 (5.7) street truck app dangerously close to 8.5 DCR.
Question is can i include elevation in my calculations and go off that to see what i can get by with???
the initial combo looks like this 4,700 lbs DCR 8.46:1 and 8.38 :1 at elevation .
if i can just go off 8.38 i can breathe a little easier.
thoughts on minimum grades of gas?
thanks Tim
Question is can i include elevation in my calculations and go off that to see what i can get by with???
the initial combo looks like this 4,700 lbs DCR 8.46:1 and 8.38 :1 at elevation .
if i can just go off 8.38 i can breathe a little easier.
thoughts on minimum grades of gas?
thanks Tim
The following users liked this post:
jeepfun_tj (01-28-2023)
#4
TECH Resident
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
so im looking at a ls1 (5.7) street truck app dangerously close to 8.5 DCR.
Question is can i include elevation in my calculations and go off that to see what i can get by with???
the initial combo looks like this 4,700 lbs DCR 8.46:1 and 8.32:1 at elevation .
if i can just go off 8.32 i can breathe a little easier.
thoughts on minimum grades of gas?
thanks Tim
Question is can i include elevation in my calculations and go off that to see what i can get by with???
the initial combo looks like this 4,700 lbs DCR 8.46:1 and 8.32:1 at elevation .
if i can just go off 8.32 i can breathe a little easier.
thoughts on minimum grades of gas?
thanks Tim
The following users liked this post:
jeepfun_tj (12-28-2022)
#6
TECH Resident
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The newer 355 hp 5.3L runs on 87 and is ~11:1. My mom has a newer Titan that has a slightly detuned version of the ~420 hp 5.6L engine that was in my M56S. It has 11.2:1 static compression with right at 400 hp and it was tuned to tow 9,600 lbs on 87 octane. That truck gets 22-23 mpg highway. The more compression you can get away with the better your mileage and power will be.
Last edited by Fast355; 12-28-2022 at 11:59 PM.
#7
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Great insight! the examples of Your iron head combo vs aluminum vs a stock set-up was really helpful! more and more people keep going with higher and higher and higher DCR on the street. i kind o wonder why so many tuners used to set a hard limit @ 8.5 DCR with premium gas?
Is it over time ideas are expanded or is it differences with setups or maybe ECM's are faster and reluctors have more teeth etc
THOUGHTS? I only bring it up as im running a 98' ls1 with a 24 tooth wheel
much thanks to everyone
Is it over time ideas are expanded or is it differences with setups or maybe ECM's are faster and reluctors have more teeth etc
THOUGHTS? I only bring it up as im running a 98' ls1 with a 24 tooth wheel
much thanks to everyone
Trending Topics
#9
The following 2 users liked this post by bobcratch:
G Atsma (01-24-2023), jeepfun_tj (01-25-2023)
#10
ModSquad
iTrader: (6)