For those who think our intake is restricted
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Besides I can get 30+ MPG in the GXP on the highway over a 4 hour drive pulled 30.8 MPG and that's doing the math. DIC actually showed a very optimistic 34.3 MPG.
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I was being a bit sarcastic, but everyone else got the point.
Really you don't think 400 lbs is that much. I wish I could lose 400 lbs from my car now, night and day difference. Plus the extra gears in the vette don't hurt either.
Besides I can get 30+ MPG in the GXP on the highway over a 4 hour drive pulled 30.8 MPG and that's doing the math. DIC actually showed a very optimistic 34.3 MPG.
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Besides I can get 30+ MPG in the GXP on the highway over a 4 hour drive pulled 30.8 MPG and that's doing the math. DIC actually showed a very optimistic 34.3 MPG.
400 pounds is a lot...for acceleration and city driving, not a HUGE difference in highway mileage.
Here's a question for you....what kind of freeway mileage does your G8 get?
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Intake is a POS! sorry.... I still think its restrictive. I wish somebody would slap it on to another ls motor and dyno test it on a engine dyno, or flow bench it for us. All of that money on heads, cam and valve train and your going to stick with the stocker!
Also, I don't think that the Z06 cam is a good choice. I looked at the specs and think that a cam with a 112-114 L/S (broader tq curve after each shift) and about 10-15 degrees more exhaust duration then the intake lobe would be a better choice since our exhaust manifolds are so restrictive. Personally I like our stock cam it pulls past 6K. I'm thinking about getting a non dod version made with the dod lift. Keep in mind that your now increasing your power band so you may now have to shift at a much higher RPM. (Duh... right?) Which means your going to need more gear and a better intake manifold to support the power band/upper rpm hp and tq. I'm only saying this cause, I just reach the top of second when going through the 1/4 mile and if I increased my power band to 6500 I'd be still going through at 5900 and would be 500-600 rpm short of going through at full speed and acceleration.
I admire you determination and I hope you succeed your goal,. keep it up!
Also, I don't think that the Z06 cam is a good choice. I looked at the specs and think that a cam with a 112-114 L/S (broader tq curve after each shift) and about 10-15 degrees more exhaust duration then the intake lobe would be a better choice since our exhaust manifolds are so restrictive. Personally I like our stock cam it pulls past 6K. I'm thinking about getting a non dod version made with the dod lift. Keep in mind that your now increasing your power band so you may now have to shift at a much higher RPM. (Duh... right?) Which means your going to need more gear and a better intake manifold to support the power band/upper rpm hp and tq. I'm only saying this cause, I just reach the top of second when going through the 1/4 mile and if I increased my power band to 6500 I'd be still going through at 5900 and would be 500-600 rpm short of going through at full speed and acceleration.
I admire you determination and I hope you succeed your goal,. keep it up!
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again, the point of this tread was to show that we can get OUR STOCK intake ported VERY aggressivly. I know that even with a stage 2 porting it will still be restrictive but it will be much better.
Also i choose the zo6 cam because of its high drivability. This is my daily driver. Also i already make peak power at 6300rpm. With these mods i should move my peak power band to 7000rpm.
I have built everything up in the engine to sustaine revving up to 7k.
Also i choose the zo6 cam because of its high drivability. This is my daily driver. Also i already make peak power at 6300rpm. With these mods i should move my peak power band to 7000rpm.
I have built everything up in the engine to sustaine revving up to 7k.
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again, the point of this tread was to show that we can get OUR STOCK intake ported VERY aggressivly. I know that even with a stage 2 porting it will still be restrictive but it will be much better.
Also i choose the zo6 cam because of its high drivability. This is my daily driver. Also i already make peak power at 6300rpm. With these mods i should move my peak power band to 7000rpm.
I have built everything up in the engine to sustaine revving up to 7k.
Also i choose the zo6 cam because of its high drivability. This is my daily driver. Also i already make peak power at 6300rpm. With these mods i should move my peak power band to 7000rpm.
I have built everything up in the engine to sustaine revving up to 7k.
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As far as the G8, I don't have DOD/AFM turned on anymore. I turned it off when I got my tune for intake,headers and x-pipe. I still pull a good 26.8 going from San Antonio to Wichita Falls (about 8 hours) keeping right at 75 the whole way. Again done with calculating after having to refuel. I don't trust the trip computers that much. The G8 weights in at 4025 lbs +/- with me in it.
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I have an old carcraft I need to scan and post up here for you guys. It's based on an SSR 5.3 build up.
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I am all for gettting some more volume in the plenum, but let's not forget the throttle by wire system does not allow the throttle to open all the way. I forget the numbers, did the math some years back, but, from memory, we only get something like 72% of the throttle body area open at WOT with the throttle itself only opening in the high 70% range. I would argue that is a greater restriction than the intake plenum. I would not expect results for a ported LS4 manifold to be as good as on a ported LS1 piece.
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I am all for gettting some more volume in the plenum, but let's not forget the throttle by wire system does not allow the throttle to open all the way. I forget the numbers, did the math some years back, but, from memory, we only get something like 72% of the throttle body area open at WOT with the throttle itself only opening in the high 70% range. I would argue that is a greater restriction than the intake plenum. I would not expect results for a ported LS4 manifold to be as good as on a ported LS1 piece.
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