HP Limits on stock bottom end
07-26-2019, 11:22 AM
#1
HP Limits on stock bottom end I’m plannig on boosting my block which is out of a 2002 z28 which is the 5.7 ls, it has 130k on the block and the engine is being pulled this winter . I’m on a tight budget but my plans were to re use the rotating assembly and get all new bearings, rings, and put in ARP main studs and ARP rod bolts. I’m also gonna be going with a different cam and will use ARP head studs with cometic head gaskets. I plan on going with 10 pounds of boost. But I just wanted some input on how far I could push it. Thanks
oh and I forgot to mention I’m gonna be going with a 76mm turbo from on3 (gonna buy their kit)
oh and I forgot to mention I’m gonna be going with a 76mm turbo from on3 (gonna buy their kit)
07-26-2019, 11:29 AM
#2
Restricted User
With a good tune, it'll be fine.
The later blocks weren't as prone to cracked sleeves as the early ones.
I wouldn't bother with ARP rod bolts. Asking for more trouble than they are worth.
The later blocks weren't as prone to cracked sleeves as the early ones.
I wouldn't bother with ARP rod bolts. Asking for more trouble than they are worth.
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64post (07-28-2019)
07-26-2019, 11:59 AM
#3
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I have tuned a commodore 2005 stock 5.7 ls1 long block only spring is changed. setup was vs 78/75 billet, deka 80lb, and walbro 400lph. on 7psi and 15d it put down 494hp through 4l80e and unknown converter 3200.
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07-28-2019, 06:48 PM
#8
TECH Fanatic
iTrader: (5)
I’m plannig on boosting my block which is out of a 2002 z28 which is the 5.7 ls, it has 130k on the block and the engine is being pulled this winter . I’m on a tight budget but my plans were to re use the rotating assembly and get all new bearings, rings, and put in ARP main studs and ARP rod bolts. I’m also gonna be going with a different cam and will use ARP head studs with cometic head gaskets. I plan on going with 10 pounds of boost. But I just wanted some input on how far I could push it. Thanks
oh and I forgot to mention I’m gonna be going with a 76mm turbo from on3 (gonna buy their kit)
oh and I forgot to mention I’m gonna be going with a 76mm turbo from on3 (gonna buy their kit)
07-30-2019, 11:23 AM
#12
Siemens Deka tall 60lb injectors work awesome and tune easily. You'll get varying opinions on pumps, but a single Walbro 450 will support the HP without issue and several have ran it on the stock regulator even though others dont recommend it.. You will need a tune obviously.
07-30-2019, 02:53 PM
#15
Many preaching E85 however unless OP's fuel system is prepped for such fuel then your asking for trouble. Not to mention the required maintenance that many over look. While it offers many benefits no doubt, it is very corrosive to your motor. Pickling your motor with straight non-ethanol gas and routine non-ethanol flushes will go a long way.
Just know what your getting into before making the plunge...otherwise enjoy the power.
Just know what your getting into before making the plunge...otherwise enjoy the power.
07-30-2019, 04:57 PM
#16
Restricted User
Many preaching E85 however unless OP's fuel system is prepped for such fuel then your asking for trouble. Not to mention the required maintenance that many over look. While it offers many benefits no doubt, it is very corrosive to your motor. Pickling your motor with straight non-ethanol gas and routine non-ethanol flushes will go a long way.
Just know what your getting into before making the plunge...otherwise enjoy the power.
Just know what your getting into before making the plunge...otherwise enjoy the power.
I'm not sure about this regular maintenance you mention, though. I've never had any issues surprisingly.
07-30-2019, 05:26 PM
#17
well thats what the point of "building" the motor to handle e85 as in changing the fuel system because i am going turbo anyways? if im going with e85 ill set my fuel system up to handle that and if i go with 91 ill set it up for that..
07-30-2019, 05:56 PM
#18
07-30-2019, 06:21 PM
#19
10 Second Club
iTrader: (2)
I've been pushing mine with 12 psi peak at 6500 rpm and 14 psi at 6800 rpm on track days with my cam only ls1. I'm honestly shocked I started at 8 psi and just kept changing pulley's and it keeps taking it. Only mods are cam, 3/8 pushrods, 660 btr springs, ported oil pump, and double roller timing set. Doesn't use oil or lose any water. I'm shocked and I've never owned an ls based engine that didn't use a little oil before this one. Only 31,600 miles on the car and I don't drive it that much, but when I do it's straight to mexico and the throttle is going wot. It's a toy only so mileage is low, but it spends it's life above 6000 rpm. The plan is to put a forged rods and pistons short block in it next winter and start pushing the blower, but I'll definitely hold onto this short block if I don't hurt it before then.
07-30-2019, 07:15 PM
#20
Many preaching E85 however unless OP's fuel system is prepped for such fuel then your asking for trouble. Not to mention the required maintenance that many over look. While it offers many benefits no doubt, it is very corrosive to your motor. Pickling your motor with straight non-ethanol gas and routine non-ethanol flushes will go a long way.
Just know what your getting into before making the plunge...otherwise enjoy the power.
Just know what your getting into before making the plunge...otherwise enjoy the power.