L92 and boost?
09-05-2016, 03:29 PM
#1
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L92 and boost? Hi I have a l92 6.2 that needs rebuild, so plan in forged rods and Pistons, but my question is this, what can the stock crank take power wise and what kind of fuel requirements will I need for say 800hp keep in mind I would like to do this with a single turbo in a 93 rx7.
Thanks
Thanks
09-05-2016, 04:09 PM
#3
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Stock crank will do fine for 800hp at the flywheel, probably 675rwhp. So would the stock rods and pistons, for that matter, as long as you have a good intercooler.
Other than that, dual 450lph pumps and 1000cc injectors. Probably use the good PTFE lines with -10 or -8 feed and -8 or -6 return, respectively, so you can use E85/93-mix if you have access to E85.
Might want to consider replacing the L92 intake with a LS3 intake, and the L92 valves with some LS3 hollow stem valves. New valve springs, lifters, pushrods, upgrade the trunions in the stock rockers, and get a turbo cam.
Other than that, dual 450lph pumps and 1000cc injectors. Probably use the good PTFE lines with -10 or -8 feed and -8 or -6 return, respectively, so you can use E85/93-mix if you have access to E85.
Might want to consider replacing the L92 intake with a LS3 intake, and the L92 valves with some LS3 hollow stem valves. New valve springs, lifters, pushrods, upgrade the trunions in the stock rockers, and get a turbo cam.
09-06-2016, 11:44 AM
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Ok, I plan on getting a ls3 intake, will I need to get a fuel pressure regulator? Btw I can't belive stock rods and Pistons will hold that power. When I built my n/a l92 for my Yukon Denali I used Mahle and scar rods as I was told that 550 whp is to much on stock rods and Pistons?
09-06-2016, 12:17 PM
#7
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Ok, I plan on getting a ls3 intake, will I need to get a fuel pressure regulator? Btw I can't belive stock rods and Pistons will hold that power. When I built my n/a l92 for my Yukon Denali I used Mahle and scar rods as I was told that 550 whp is to much on stock rods and Pistons?
The stock pistons can hang right along with them but they're picky on detonation/heat. The guys running methanol usually have no issues making the stock pistons last as long as the stock rods.
The crank usually gives out in the 1200-1400 range.
Chances are, the stock rotating assembly will outlast the block itself in a perfect scenario.
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09-06-2016, 12:37 PM
#8
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As a real-world check, tune has to be spot-on to make these live above 800whp.
It is becoming a lot more common to see them in the 800-1000whp range on a stock rotating assembly, but precautions are usually made to help them live. The ones living for 2+ years above 1000 HP aren't street cars either. You're talking drag cars, dyno queens, etc.
It is becoming a lot more common to see them in the 800-1000whp range on a stock rotating assembly, but precautions are usually made to help them live. The ones living for 2+ years above 1000 HP aren't street cars either. You're talking drag cars, dyno queens, etc.
09-07-2016, 10:03 PM
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Wow, I had no clue they can handle that kind of power. I was told by a couple people that the powder rods can't handle that kind of power and that the piston ring lands are weak. Is there more stress on a n/a engine than a boosted setup? How do I use arp bolts on l92 rods since powder rods can not be reused?
09-07-2016, 10:09 PM
#11
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N/A usually revs higher, has a bigger cam, etc. More stress in the valvetrain and some parts of rotating assembly.
Rod bolts are pointless if you keep the RPM down, since power doesn't effect them at all.
Rod bolts are pointless if you keep the RPM down, since power doesn't effect them at all.
09-08-2016, 07:32 AM
#13
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Your L92 has a MAP sensor already in the intake, so I would hope so.
I don't have much experience with the later gen 4 computers, but the stock Gen 3 is more than capable of insane numbers, so I would assume its fine.
I don't have much experience with the later gen 4 computers, but the stock Gen 3 is more than capable of insane numbers, so I would assume its fine.
09-09-2016, 10:01 PM
#15
Wow, I had no clue they can handle that kind of power. I was told by a couple people that the powder rods can't handle that kind of power and that the piston ring lands are weak. Is there more stress on a n/a engine than a boosted setup? How do I use arp bolts on l92 rods since powder rods can not be reused?
09-12-2016, 12:23 AM
#16
People pop ring lands all the time. The reason is the stock ring gap only works up to a point before the rings butt ends, cracking the lands on the pistons. And yes, the rods will break before the crank, but that is still usually north of 800hp. As to the last point, stock rod bolts have held to the point of breaking stock rods on FI setups, so I think the point is moot. Turbos are MUCH easier on rod bolts than a high revving N/A setup.
I'm hoping that maybe others can read this, & not repeat the mistake I made...
