LQ4 Twin Turbo horsepower question
07-31-2015, 09:42 AM
#1
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LQ4 Twin Turbo horsepower question I'm building an LQ4 408 twin turbo and was wondering what would be the maximum power I can push it to safely and the potential power I can make on a conservative boost level:
LQ4 408 10:1 CR
AFR 230cc heads (2.02/1.60)
Callies DragonSlayer 4" crank
Callies H-beam 6.125" rods
1.6 Scorpion roller rockers
Chromoly pushrods
Kooks headers
Dynomax race bullet muffler
Borla catback
Brian Tooley Springs
Jake's Performance Stage V 4L80E
Yank 3600 stall converter
E85
3.00 gear ratio
JE pistons
Precision Turbo twin turbos (any recommended size?)
Holley EFI dominator with 5.7" screen
Thanks!
LQ4 408 10:1 CR
AFR 230cc heads (2.02/1.60)
Callies DragonSlayer 4" crank
Callies H-beam 6.125" rods
1.6 Scorpion roller rockers
Chromoly pushrods
Kooks headers
Dynomax race bullet muffler
Borla catback
Brian Tooley Springs
Jake's Performance Stage V 4L80E
Yank 3600 stall converter
E85
3.00 gear ratio
JE pistons
Precision Turbo twin turbos (any recommended size?)
Holley EFI dominator with 5.7" screen
Thanks!
07-31-2015, 04:51 PM
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Would a 408 hold up to 1,800hp-2,000hp or is that pushing it? My goal with this build is to have a street car capable of that and I'm afraid if I set the boost to that level one time that it would blow up. Should I do a LQ4 418 for that goal or just make a strong 408 and not push it to 418?
07-31-2015, 04:57 PM
#5
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Would a 408 hold up to 1,800hp-2,000hp or is that pushing it? My goal with this build is to have a street car capable of that and I'm afraid if I set the boost to that level one time that it would blow up. Should I do a LQ4 418 for that goal or just make a strong 408 and not push it to 418?
A poorly designed stroker can as well, lowering the rod/stroke ratio putting more side-load on the rods and pistons.
The next time I decide to go for 1500 hp im going no higher than 370 ci.
07-31-2015, 05:11 PM
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Would a 408 hold up to 1,800hp-2,000hp or is that pushing it? My goal with this build is to have a street car capable of that and I'm afraid if I set the boost to that level one time that it would blow up. Should I do a LQ4 418 for that goal or just make a strong 408 and not push it to 418?
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08-01-2015, 12:57 AM
#9
There aren't too many guys pushing 4-bolt heads/block to those power levels anymore with the vast variety of 6-bolt stuff now on the market. You'd be dollars ahead to start with 6-bolt stuff and not look back. Take it from me, someone who has spent and is spending stupid money trying to make the 4-bolt stuff work at big power.
If you insist on moving forward. Slide on over to yellow bullet and do a little searching and reading on the topic. Lots of good info there. You can also seek out the cooling system mods I am currently doing to my iron 408 in an effort to keep head gaskets in it for more than 35 passes.
I'm spinning a blower that takes about 250-300 horsepower to turn and attemping to make near 1400 horse power. Which means my long block is being exposed to the strains of about 1700 horsepower. At that level with 4-bolt stuff I am quickly learning that head gasket become routine maintenance, much like oil changes.
If you insist on moving forward. Slide on over to yellow bullet and do a little searching and reading on the topic. Lots of good info there. You can also seek out the cooling system mods I am currently doing to my iron 408 in an effort to keep head gaskets in it for more than 35 passes.
I'm spinning a blower that takes about 250-300 horsepower to turn and attemping to make near 1400 horse power. Which means my long block is being exposed to the strains of about 1700 horsepower. At that level with 4-bolt stuff I am quickly learning that head gasket become routine maintenance, much like oil changes.
08-01-2015, 07:53 AM
#11
LQ4 Twin Turbo horsepower question Yup, Blown06 is right. You are waisting your money on a 4bolt block. Anyone who tells you 1500CHP or WHP on a 4 bolt block is anywhere near "reliable" is lying to you. If you want to make anything over 1000whp safely and regularly you need to be looking into an LSX block or any other 6 bolt.
08-01-2015, 08:45 AM
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I've talked to FR8TRN and he's running 800-1200hp to the ground. I'm not going to boost it up to anywhere near 1600 I just want to go all out with knowing that my motor is built strong since my dad is giving me his motor and trans out of his 01 2500 so I said why not.
08-03-2015, 10:52 PM
#19
just run it at 1000rwhp and beat it untill it dies. buy then you should have saved up for a 6 bolt lsx block and nice 6 bolt heads for your 1500-2000 hp goal.
if you think a stock 4 bolt block is going to make it down the track @ 1500-2000hp i think your going to be very disappointed
if you think a stock 4 bolt block is going to make it down the track @ 1500-2000hp i think your going to be very disappointed
08-04-2015, 12:09 AM
#20
Curious why everyone keeps saying more cubes is bad........
NRE makes 2,500 HP on their LSX 454ci TT........built as a daily driver.
http://www.nelsonracingengines.com/p..._454lsx_tt.pdf
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NRE makes 2,500 HP on their LSX 454ci TT........built as a daily driver.
http://www.nelsonracingengines.com/p..._454lsx_tt.pdf
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