How much difference and where on cam swap?
Nov 9, 2023 | 08:57 PM
#1
Thread Starter
On The Tree
Joined: Feb 2018
Posts: 187
Likes: 26
How much difference and where on cam swap?
How much of a difference, if any will it make and where- is 6* or the change in LSA enough to tank the low end? I was happy with comp until it Epsteined itself.
Ordering a cam to replace the Comp VVT cam I currently have. 2011 6.2, Speed Engineering LT's w/ ORY, 3.5" MPRP exhaust, and a D1SC that currently makes about 12 psi. Daily driven 100+ miles on the interstate, tow rig, cruiser for long trips.
Current cam is Comp 189-400-13. Specs are 210/224, .556/.558 lift, and 114 lsa.
Looking at moving to a Gwatney cam- 216/230, .554/.554 lift, and 113+8. The other option is 212/226 with the same specs.
Laughably, I'm guessing MPG would remain about the same?
Ordering a cam to replace the Comp VVT cam I currently have. 2011 6.2, Speed Engineering LT's w/ ORY, 3.5" MPRP exhaust, and a D1SC that currently makes about 12 psi. Daily driven 100+ miles on the interstate, tow rig, cruiser for long trips.
Current cam is Comp 189-400-13. Specs are 210/224, .556/.558 lift, and 114 lsa.
Looking at moving to a Gwatney cam- 216/230, .554/.554 lift, and 113+8. The other option is 212/226 with the same specs.
Laughably, I'm guessing MPG would remain about the same?
Nov 10, 2023 | 07:26 AM
#3
TECH Apprentice
Joined: Jun 2011
Posts: 320
Likes: 157
Looking at the specs, I'd say either will be an improvement on the upper end with the VVT properly tuned.
The GPI 212 should make even more low end both than the comp did thanks to the it's really early closing point. Even at part throttle, it has slightly more overlap than the comp, but I think tuning and the early IVC will make it drive about the same at light to moderate loads. Idle will sound a little more aggressive, but you should be able to keep the idle rpm the same.Therefore, I'd expect the same fuel economy as before too.
The GPI 216 will probably feel the similar heavy load on the low end as the comp, but boost with centrifugal blower will probably build a little later and it you'll need a little more pedal on part throttle thanks to the overlap. It's also going to idle much more aggressively and require a bump in idle rpm. Fuel economy will drop some compared to the smaller cams due to the idle and part throttle characteristics.
Between those 2 choices, I'd go 212. Tow about the same, possibly better. Still more peak power. Likely no loss in fuel economy.
The GPI 212 should make even more low end both than the comp did thanks to the it's really early closing point. Even at part throttle, it has slightly more overlap than the comp, but I think tuning and the early IVC will make it drive about the same at light to moderate loads. Idle will sound a little more aggressive, but you should be able to keep the idle rpm the same.Therefore, I'd expect the same fuel economy as before too.
The GPI 216 will probably feel the similar heavy load on the low end as the comp, but boost with centrifugal blower will probably build a little later and it you'll need a little more pedal on part throttle thanks to the overlap. It's also going to idle much more aggressively and require a bump in idle rpm. Fuel economy will drop some compared to the smaller cams due to the idle and part throttle characteristics.
Between those 2 choices, I'd go 212. Tow about the same, possibly better. Still more peak power. Likely no loss in fuel economy.
Nov 10, 2023 | 09:35 AM
#4
Thread Starter
On The Tree
Joined: Feb 2018
Posts: 187
Likes: 26
Looking at the specs, I'd say either will be an improvement on the upper end with the VVT properly tuned.
The GPI 212 should make even more low end both than the comp did thanks to the it's really early closing point. Even at part throttle, it has slightly more overlap than the comp, but I think tuning and the early IVC will make it drive about the same at light to moderate loads. Idle will sound a little more aggressive, but you should be able to keep the idle rpm the same.Therefore, I'd expect the same fuel economy as before too.
The GPI 216 will probably feel the similar heavy load on the low end as the comp, but boost with centrifugal blower will probably build a little later and it you'll need a little more pedal on part throttle thanks to the overlap. It's also going to idle much more aggressively and require a bump in idle rpm. Fuel economy will drop some compared to the smaller cams due to the idle and part throttle characteristics.
Between those 2 choices, I'd go 212. Tow about the same, possibly better. Still more peak power. Likely no loss in fuel economy.
The GPI 212 should make even more low end both than the comp did thanks to the it's really early closing point. Even at part throttle, it has slightly more overlap than the comp, but I think tuning and the early IVC will make it drive about the same at light to moderate loads. Idle will sound a little more aggressive, but you should be able to keep the idle rpm the same.Therefore, I'd expect the same fuel economy as before too.
The GPI 216 will probably feel the similar heavy load on the low end as the comp, but boost with centrifugal blower will probably build a little later and it you'll need a little more pedal on part throttle thanks to the overlap. It's also going to idle much more aggressively and require a bump in idle rpm. Fuel economy will drop some compared to the smaller cams due to the idle and part throttle characteristics.
Between those 2 choices, I'd go 212. Tow about the same, possibly better. Still more peak power. Likely no loss in fuel economy.
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