6.0, ported 243s, fast setup w/supporting mods.. 356 hp?
03-29-2016, 12:20 PM
#22
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03-29-2016, 12:22 PM
#23
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This car was stock bottom end with patriot stage 2s and fast setup injectors etc.
headgasket went at some point and hydrolocked it a few months ago, thats why I went to 6.0 block and better internals, just reused the top end and supporting mods.
03-29-2016, 01:56 PM
#28
Just kinda grasping at ideas because I understand your frustration.
Does the car sound strange as far as the exhaust note? Maybe something foreign is blocking exhaust flow and choking it under load? I've seen that with chambered mufflers where a panel comes loose inside but normally that shouldn't be an issue with a magnaflow I wouldn't think...guess it wouldn't hurt to drop just the muffler if that's easily done on the car.
Guess it's possible the FAST could have internal damage or a seal leak but not sure if that would cause this much trouble.
I know you said you were picking up a little retard and 20* in the area where the biggest problem exists is already on the low side....makes me wonder if there could be a false knock, fuel quality, or lean cylinder issue.
Around here there is an abundance of **** fuel from places like Murphy, Casey's, Kum N Go, etc. Decent 91 octane requires going to Shell or Conoco/Phillips.
It says you think the engine should have 11:1 compression, I am not familiar with the LS9 gasket thickness but a stock ls2 is 10.9:1 with a ~64-65cc chamber head. Mine cc'd at just over 63cc with .015" shaved off. If yours are 59cc there is a chance you have a good bit more compression.
Again, just tossing out ideas...
Does the car sound strange as far as the exhaust note? Maybe something foreign is blocking exhaust flow and choking it under load? I've seen that with chambered mufflers where a panel comes loose inside but normally that shouldn't be an issue with a magnaflow I wouldn't think...guess it wouldn't hurt to drop just the muffler if that's easily done on the car.
Guess it's possible the FAST could have internal damage or a seal leak but not sure if that would cause this much trouble.
I know you said you were picking up a little retard and 20* in the area where the biggest problem exists is already on the low side....makes me wonder if there could be a false knock, fuel quality, or lean cylinder issue.
Around here there is an abundance of **** fuel from places like Murphy, Casey's, Kum N Go, etc. Decent 91 octane requires going to Shell or Conoco/Phillips.
It says you think the engine should have 11:1 compression, I am not familiar with the LS9 gasket thickness but a stock ls2 is 10.9:1 with a ~64-65cc chamber head. Mine cc'd at just over 63cc with .015" shaved off. If yours are 59cc there is a chance you have a good bit more compression.
Again, just tossing out ideas...
03-29-2016, 02:24 PM
#29
Car does have full magnaflow exhaust, no cats,
the pistons came from 2009 g8 6.0 engine. with gm dyno time only. there is a very small dish/two very small valve reliefs on pistons come up to -4cc overall. 4.100 .051 gasket
Calculates out to 11.08
the pistons came from 2009 g8 6.0 engine. with gm dyno time only. there is a very small dish/two very small valve reliefs on pistons come up to -4cc overall. 4.100 .051 gasket
Calculates out to 11.08
Last edited by 9sectruck; 03-29-2016 at 02:30 PM.
03-29-2016, 02:37 PM
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The fuel is 93 octane from a local Eagle stop. I have had multiple cars require it and never had any issues with it. Not that it means they couldn't have problem gas, but I haven't heard any complaints about it locally.
Exhaust note sounds damn beautiful to me.
Exhaust note sounds damn beautiful to me.
03-29-2016, 02:59 PM
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My bet is you make low 400s~
If all goes as we planned, motor has to come out saturday anyway to fix rear main gasket that didnt take very well, and HOPEFULLY we get to the bottom of it and motor goes back in Sunday.
03-29-2016, 03:09 PM
#34
Yep, this will tell for sure. My hope is that you will make 360
My bet is you make low 400s~
If all goes as we planned, motor has to come out saturday anyway to fix rear main gasket that didnt take very well, and HOPEFULLY we get to the bottom of it and motor goes back in Sunday.
My bet is you make low 400s~
If all goes as we planned, motor has to come out saturday anyway to fix rear main gasket that didnt take very well, and HOPEFULLY we get to the bottom of it and motor goes back in Sunday.
03-30-2016, 04:21 PM
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we are definitely on a mission to find out.
My car is going back out to the shop tonight to start tearing motor out to fix the oil leak and compression test etc. Hopefully Sunday will shed some light on the dyno itself.
My car is going back out to the shop tonight to start tearing motor out to fix the oil leak and compression test etc. Hopefully Sunday will shed some light on the dyno itself.
03-30-2016, 04:31 PM
#40
Yes the 5.3 car is the only car that made the power i expected. Everybody else 60-80hp low.. Honstly i do hope nathans car only puts down 345-360. I have been in contact with mustang about this they are trying to help as much as they can over the phone