What kind of power from these mods Ls6
#1
What kind of power from these mods Ls6
F.A.S.T 92mm
Obx longtube headers (everything behind the fake cats is stock with muffler delete)
Ms3 cam springs and pushrods
Stock cai
Stock ls6 heads
Just curious finally have the money to make it fast you're opinions are welcomed
Obx longtube headers (everything behind the fake cats is stock with muffler delete)
Ms3 cam springs and pushrods
Stock cai
Stock ls6 heads
Just curious finally have the money to make it fast you're opinions are welcomed
#7
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#9
#13
TECH Fanatic
#14
TECH Fanatic
iTrader: (1)
If you run 1 7/8 headers with a 3" collector on a 5.7ltr engine you will be sacrificing a lot more power for peak. On an engine of that size it would be recommended to run 1 3/4 with 3" collectors for then you gain across the power band.
Running bigger tubes needs more air to pass through or else it will work against you making it harder to tune the car and get it to run properly.
Its like running 3" exhaust with cam and headers. You wont benefit from the extra cfm for you havent pushed past the limits of the 2.5" catback.
I say this confidently with experience. I have altered everything in my car and finally got the formula right. I am running 1 7/8 with 3" collectors and 2.5" catback, power is plentiful and there is no end to the push...Idle is smooth (which i have witnessed first hand recently) am waiting for my body shop to pull out the rear fenders another in so i may run it on the road and see how she performs...
My tahoe went through the same treatment. Had 1 3/4 headers for my 5.3 and modified 6.0. Made 425/420 with 1 3/4 headers and single 3.5" catback. I then tried 1 7/8 headers on the setup and lost 25/20 making it only 400/400 at the wheel after tuning. I then upgraded to a 6.6 and used the 1 7/8 headers. Made 500/500. If i use the 1 3/4 headers i will gain torque and lose Hp...
So size matters and if you get the combo correct you will have all the proper power in the world...
Running bigger tubes needs more air to pass through or else it will work against you making it harder to tune the car and get it to run properly.
Its like running 3" exhaust with cam and headers. You wont benefit from the extra cfm for you havent pushed past the limits of the 2.5" catback.
I say this confidently with experience. I have altered everything in my car and finally got the formula right. I am running 1 7/8 with 3" collectors and 2.5" catback, power is plentiful and there is no end to the push...Idle is smooth (which i have witnessed first hand recently) am waiting for my body shop to pull out the rear fenders another in so i may run it on the road and see how she performs...
My tahoe went through the same treatment. Had 1 3/4 headers for my 5.3 and modified 6.0. Made 425/420 with 1 3/4 headers and single 3.5" catback. I then tried 1 7/8 headers on the setup and lost 25/20 making it only 400/400 at the wheel after tuning. I then upgraded to a 6.6 and used the 1 7/8 headers. Made 500/500. If i use the 1 3/4 headers i will gain torque and lose Hp...
So size matters and if you get the combo correct you will have all the proper power in the world...
#16
TECH Senior Member
iTrader: (18)
If you run 1 7/8 headers with a 3" collector on a 5.7ltr engine you will be sacrificing a lot more power for peak. On an engine of that size it would be recommended to run 1 3/4 with 3" collectors for then you gain across the power band.
Running bigger tubes needs more air to pass through or else it will work against you making it harder to tune the car and get it to run properly.
Its like running 3" exhaust with cam and headers. You wont benefit from the extra cfm for you havent pushed past the limits of the 2.5" catback.
I say this confidently with experience. I have altered everything in my car and finally got the formula right. I am running 1 7/8 with 3" collectors and 2.5" catback, power is plentiful and there is no end to the push...Idle is smooth (which i have witnessed first hand recently) am waiting for my body shop to pull out the rear fenders another in so i may run it on the road and see how she performs...
My tahoe went through the same treatment. Had 1 3/4 headers for my 5.3 and modified 6.0. Made 425/420 with 1 3/4 headers and single 3.5" catback. I then tried 1 7/8 headers on the setup and lost 25/20 making it only 400/400 at the wheel after tuning. I then upgraded to a 6.6 and used the 1 7/8 headers. Made 500/500. If i use the 1 3/4 headers i will gain torque and lose Hp...
So size matters and if you get the combo correct you will have all the proper power in the world...
Running bigger tubes needs more air to pass through or else it will work against you making it harder to tune the car and get it to run properly.
Its like running 3" exhaust with cam and headers. You wont benefit from the extra cfm for you havent pushed past the limits of the 2.5" catback.
I say this confidently with experience. I have altered everything in my car and finally got the formula right. I am running 1 7/8 with 3" collectors and 2.5" catback, power is plentiful and there is no end to the push...Idle is smooth (which i have witnessed first hand recently) am waiting for my body shop to pull out the rear fenders another in so i may run it on the road and see how she performs...
My tahoe went through the same treatment. Had 1 3/4 headers for my 5.3 and modified 6.0. Made 425/420 with 1 3/4 headers and single 3.5" catback. I then tried 1 7/8 headers on the setup and lost 25/20 making it only 400/400 at the wheel after tuning. I then upgraded to a 6.6 and used the 1 7/8 headers. Made 500/500. If i use the 1 3/4 headers i will gain torque and lose Hp...
So size matters and if you get the combo correct you will have all the proper power in the world...
Its just not true.
#17
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#18
TECH Apprentice
iTrader: (8)
I have an 05 LS6 with an aggressive cam, trick flow 220s, a forged bottom end, a FAST 92, LS2 TB & Kooks 1 3/4 headers (among other things) . Took it to Slowhawk Performance & made 405hp/366tq. I expect I have a little loss from the forged bottom end so maybe you'll hit 400.
#19
TECH Fanatic
I have an 05 LS6 with an aggressive cam, trick flow 220s, a forged bottom end, a FAST 92, LS2 TB & Kooks 1 3/4 headers (among other things) . Took it to Slowhawk Performance & made 405hp/366tq. I expect I have a little loss from the forged bottom end so maybe you'll hit 400.