Changing turbo, which one now??
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Joined: Mar 2014
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From: Ohio
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What kind of timing and AFR do you run until you have few PSI in it? I had taken some suggestions from Slow Sedan awhile back and leaned it out to low 13's/high 12's AFR until 3500 rpm's and ramp down to low 11's from there. Timing is ~NA until 3k and then ramps down to mid teen's @ 3500.
What kind of timing and AFR do you run until you have few PSI in it? I had taken some suggestions from Slow Sedan awhile back and leaned it out to low 13's/high 12's AFR until 3500 rpm's and ramp down to low 11's from there. Timing is ~NA until 3k and then ramps down to mid teen's @ 3500.
I leave 25+ degrees in until 120kPa and mid 12's gas afr. six liter, short duration wide lsa cam similar turbo to joes. 70% alcohol. ramped down to 15º at peak torque area
lights fast for a 96x88 t4 turbine I'm told. same motor with a billet 7875 was like having a PD blower though.
I leave 25+ degrees in until 120kPa and mid 12's gas afr. six liter, short duration wide lsa cam similar turbo to joes. 70% alcohol. ramped down to 15º at peak torque area
lights fast for a 96x88 t4 turbine I'm told. same motor with a billet 7875 was like having a PD blower though.
lights fast for a 96x88 t4 turbine I'm told. same motor with a billet 7875 was like having a PD blower though.
It's weird that size really matters. Part of me wonders though if its really the cubes or the valve shrouding from using 2.0 valves on a small bore motor. Especially when I see the power Holdener makes with the small valve truck heads.
On a somewhat related note, I have a flat top piston'd 5.3 with 317 heads and a baby cam in my NA truck and it just doesn't make the power I think it should. Maybe not enough cam but it just runs out of steam at 5500.
On a somewhat related note, I have a flat top piston'd 5.3 with 317 heads and a baby cam in my NA truck and it just doesn't make the power I think it should. Maybe not enough cam but it just runs out of steam at 5500.
thats interesting, I haven't really paid attention to how high people are reving there 5.3s..... 317s would make even lower compression then my 241s.... When I researched the 7875 before buying it, I saw alot saying it doesn't really shine until 15+psi, I'm only running 10psi. I feel like I'm underutilizing the turbo with low boost and not reving it higher then 6200, but I'm ok with how much power it makes for a dd, just want to figure out the lag
Originally Posted by ls1charged
thats interesting, I haven't really paid attention to how high people are reving there 5.3s..... 317s would make even lower compression then my 241s.... When I researched the 7875 before buying it, I saw alot saying it doesn't really shine until 15+psi, I'm only running 10psi. I feel like I'm underutilizing the turbo with low boost and not reving it higher then 6200, but I'm ok with how much power it makes for a dd, just want to figure out the lag
It's weird that size really matters. Part of me wonders though if its really the cubes or the valve shrouding from using 2.0 valves on a small bore motor. Especially when I see the power Holdener makes with the small valve truck heads.
On a somewhat related note, I have a flat top piston'd 5.3 with 317 heads and a baby cam in my NA truck and it just doesn't make the power I think it should. Maybe not enough cam but it just runs out of steam at 5500.
On a somewhat related note, I have a flat top piston'd 5.3 with 317 heads and a baby cam in my NA truck and it just doesn't make the power I think it should. Maybe not enough cam but it just runs out of steam at 5500.
When I was doing my research, it was only on people running 5.3s and a 7875 because that's what I was building....however, It's much more difficult to search same cams and head setups so IMO that can be where the difference is in mine...
Restricted User
Joined: Mar 2014
Posts: 7,192
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From: Ohio
What kind of timing and AFR do you run until you have few PSI in it? I had taken some suggestions from Slow Sedan awhile back and leaned it out to low 13's/high 12's AFR until 3500 rpm's and ramp down to low 11's from there. Timing is ~NA until 3k and then ramps down to mid teen's @ 3500.