5.3L Boost questions?
06-24-2009, 02:30 PM
#1
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5.3L Boost questions? I have a friend and I am posting this for him. . .
List of his mods:
5.3L LM7 Engine (60k milles on it)
Turbonetics TC 78 - single turbo
317 heads
stock truck intake mani. and tb
LS6 Cam
60LB Injectors
Pushrods, springs
ls6 ported oil pump
arp head studs and rod bolts
He is thinking of running 14 psi on 91 octane (no meth) we figured the compression should be at 8:5:1. He wanted to know if that has been done before and if he had a good enough tune can it be reliable? Also how much WHP have people seen with those mods or what would you guys estimate?
List of his mods:
5.3L LM7 Engine (60k milles on it)
Turbonetics TC 78 - single turbo
317 heads
stock truck intake mani. and tb
LS6 Cam
60LB Injectors
Pushrods, springs
ls6 ported oil pump
arp head studs and rod bolts
He is thinking of running 14 psi on 91 octane (no meth) we figured the compression should be at 8:5:1. He wanted to know if that has been done before and if he had a good enough tune can it be reliable? Also how much WHP have people seen with those mods or what would you guys estimate?
06-24-2009, 02:55 PM
#2
TECH Apprentice
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I am running 12 psi on a BONE STOCK longblock.....and abusing the shizz out of it. I think with the goodies he has, he'd be fine....with a good, conservative tune, of course.
The only thing that scares me is the 91 octane....
The only thing that scares me is the 91 octane....
06-24-2009, 03:15 PM
#6
I have a friend and I am posting this for him. . .
List of his mods:
5.3L LM7 Engine (60k milles on it)
Turbonetics TC 78 - single turbo
317 heads
stock truck intake mani. and tb
LS6 Cam
60LB Injectors
Pushrods, springs
ls6 ported oil pump
arp head studs and rod bolts
He is thinking of running 14 psi on 91 octane (no meth) we figured the compression should be at 8:5:1. He wanted to know if that has been done before and if he had a good enough tune can it be reliable? Also how much WHP have people seen with those mods or what would you guys estimate?
List of his mods:
5.3L LM7 Engine (60k milles on it)
Turbonetics TC 78 - single turbo
317 heads
stock truck intake mani. and tb
LS6 Cam
60LB Injectors
Pushrods, springs
ls6 ported oil pump
arp head studs and rod bolts
He is thinking of running 14 psi on 91 octane (no meth) we figured the compression should be at 8:5:1. He wanted to know if that has been done before and if he had a good enough tune can it be reliable? Also how much WHP have people seen with those mods or what would you guys estimate?
06-25-2009, 09:30 AM
#12
I calculated it to 8.6:1 compression. I think the 317s worked good on the 5.3L. Doesnt matter that they were made for a 4.00" bore, just use the 6L head gasket so the fire ring isnt inside the chamber. I ran 15psi and a 50 shot of spray through it for 3 years on the stock bottom end. Still runs like a dream and im looking for another car to stick it in.
I never dynoed it but weighs 3660lbs with me in it and runs consistent 10.30s @ 131mph equates to about 640whp. But the GT45 turbo is rather laggy and also im screaming through the lights cause my 4000 stall converter is blowing through a little. Im shifting at about 7300 and going through the lights near 6000. 29.5" tall tire w/ 3.50 gears.
This was initially just a mock up engine to build the turbo setup and practice tuning on it. I'd never messed with one before. I honeslty never expected it to last more than a month. The cam was just an extra one I had laying around. 224/224 .580/.580 112
And i also have a vic Jr intake on it with an elbow I made. Its got no low end power at all. But it was such a good/cheap effective combo my buddy built one for his BMW w/ a t70.
Mine is very reliable. Gets good gas mileage cruising around and its quiet.
I never dynoed it but weighs 3660lbs with me in it and runs consistent 10.30s @ 131mph equates to about 640whp. But the GT45 turbo is rather laggy and also im screaming through the lights cause my 4000 stall converter is blowing through a little. Im shifting at about 7300 and going through the lights near 6000. 29.5" tall tire w/ 3.50 gears.
This was initially just a mock up engine to build the turbo setup and practice tuning on it. I'd never messed with one before. I honeslty never expected it to last more than a month. The cam was just an extra one I had laying around. 224/224 .580/.580 112
And i also have a vic Jr intake on it with an elbow I made. Its got no low end power at all. But it was such a good/cheap effective combo my buddy built one for his BMW w/ a t70.
Mine is very reliable. Gets good gas mileage cruising around and its quiet.
06-25-2009, 09:50 AM
#13
Yes it's very possible to do. on my 2008 chevy i had a front mount trubo with T76GTS and 14 psi of boost and i never had any problems, i did hit it with 18 psi and 75 shot of nitrous but i used some octain booster. my truck dynod 656 rwhp and 696 rwtq on a mustang dyno and on 14 psi, xms boostaholic II cam and the rest of the motor completly stock.
06-25-2009, 01:18 PM
#14
I calculated it to 8.6:1 compression. I think the 317s worked good on the 5.3L. Doesnt matter that they were made for a 4.00" bore, just use the 6L head gasket so the fire ring isnt inside the chamber. I ran 15psi and a 50 shot of spray through it for 3 years on the stock bottom end. Still runs like a dream and im looking for another car to stick it in.
I never dynoed it but weighs 3660lbs with me in it and runs consistent 10.30s @ 131mph equates to about 640whp. But the GT45 turbo is rather laggy and also im screaming through the lights cause my 4000 stall converter is blowing through a little. Im shifting at about 7300 and going through the lights near 6000. 29.5" tall tire w/ 3.50 gears.
This was initially just a mock up engine to build the turbo setup and practice tuning on it. I'd never messed with one before. I honeslty never expected it to last more than a month. The cam was just an extra one I had laying around. 224/224 .580/.580 112
And i also have a vic Jr intake on it with an elbow I made. Its got no low end power at all. But it was such a good/cheap effective combo my buddy built one for his BMW w/ a t70.
Mine is very reliable. Gets good gas mileage cruising around and its quiet.
I never dynoed it but weighs 3660lbs with me in it and runs consistent 10.30s @ 131mph equates to about 640whp. But the GT45 turbo is rather laggy and also im screaming through the lights cause my 4000 stall converter is blowing through a little. Im shifting at about 7300 and going through the lights near 6000. 29.5" tall tire w/ 3.50 gears.
This was initially just a mock up engine to build the turbo setup and practice tuning on it. I'd never messed with one before. I honeslty never expected it to last more than a month. The cam was just an extra one I had laying around. 224/224 .580/.580 112
And i also have a vic Jr intake on it with an elbow I made. Its got no low end power at all. But it was such a good/cheap effective combo my buddy built one for his BMW w/ a t70.
Mine is very reliable. Gets good gas mileage cruising around and its quiet.
06-25-2009, 03:23 PM
#15
Yes it's very possible to do. on my 2008 chevy i had a front mount trubo with T76GTS and 14 psi of boost and i never had any problems, i did hit it with 18 psi and 75 shot of nitrous but i used some octain booster. my truck dynod 656 rwhp and 696 rwtq on a mustang dyno and on 14 psi, xms boostaholic II cam and the rest of the motor completly stock.
06-25-2009, 04:26 PM
#16
06-25-2009, 05:19 PM
#18