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Should i do a 416?

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Old Jul 18, 2016 | 01:28 PM
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Default Should i do a 416?

I have a 2015 z51 a8
I have h,c,i and a a&a ti kit making 780hp 658tq.

Im getting ready to do pistons and rods but been thinking about going with a 416 since the motor will be out.

What are all the pros and cons associated with going to a 416?

Im not made of money otherwise i just go a head a do it.

Your thoughts are much appreciated
Eric
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Old Jul 18, 2016 | 01:50 PM
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It depends on your goals. At 780 at the wheels, you're already beyond the point that other than running drag radials, traction is a sometimes thing. More power will buy you more tire smoke, but not much else. On the other hand, the larger engine will have more torque off boost, but there are many stock displacement LT1s (and LS1s) that are pushing 1000 rwhp with boost and good tuning.

Last edited by Steve Garrett; Jul 19, 2016 at 09:11 AM. Reason: No need to re-quote the OP, especially if you're the next person posting.
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Old Jul 18, 2016 | 05:26 PM
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Only way I would do a 416 is if I would have hurt the stock motor. I did the Weisco Forged Dropins to keep it safe. I believe some folks have pushed them to 1000RWHP.
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Old Jul 18, 2016 | 10:18 PM
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I would not go bigger cube's, the blower will become more of a restriction. If you go bigger cube's plan on upgrading the headunit if you want more power. However i am not a fan of how thin these cylinder walls are already and opening them up more without doing the ERL superdeck conversion is not the best imo. Boosted motor a 390 or 400 is absolutely the perfect size imo.
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Old Jul 18, 2016 | 11:29 PM
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Originally Posted by Joe@CPR
I would not go bigger cube's, the blower will become more of a restriction. If you go bigger cube's plan on upgrading the headunit if you want more power. However i am not a fan of how thin these cylinder walls are already and opening them up more without doing the ERL superdeck conversion is not the best imo. Boosted motor a 390 or 400 is absolutely the perfect size imo.
Then spin the TI unit until it is over it's limit. Use all ARP stuff and use head studs and pin the mains in the block.
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Old Jul 19, 2016 | 04:41 AM
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Originally Posted by Joe@CPR
I would not go bigger cube's, the blower will become more of a restriction. If you go bigger cube's plan on upgrading the headunit if you want more power. However i am not a fan of how thin these cylinder walls are already and opening them up more without doing the ERL superdeck conversion is not the best imo. Boosted motor a 390 or 400 is absolutely the perfect size imo.
I plan on adding Pistons after the S/c is it better to add the weisco lower compression or use the forged drop in piston same compression

Also how much hp will I lose from the lower compression piston
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Old Jul 19, 2016 | 08:32 AM
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Originally Posted by Seannyc
I plan on adding Pistons after the S/c is it better to add the weisco lower compression or use the forged drop in piston same compression

Also how much hp will I lose from the lower compression piston
If I was going to put the boost to the car I wouldn't go much over 10:5 to1. I am talking like close r over 20lbs. But if only 10lbs to 12 lbs of boost will not are shouldn't hurt same compression pistons.

These cars like the compression but like most every thing else to a point with it. Let see what Joe will say on it...
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Old Jul 19, 2016 | 12:50 PM
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After discussing it with my shop and my budget, i decided not to do the 416. Im not looking to make a bunch more power, more concerned with having safe power.

Going with Weisco pistons and Callies connecting rods and all arp hardware.

My goal is to get into the 9's in the qtr. I think i have the power to do it as long as i can hook.
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Old Jul 19, 2016 | 12:57 PM
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Originally Posted by Joe@CPR
I would not go bigger cube's, the blower will become more of a restriction. If you go bigger cube's plan on upgrading the headunit if you want more power. However i am not a fan of how thin these cylinder walls are already and opening them up more without doing the ERL superdeck conversion is not the best imo. Boosted motor a 390 or 400 is absolutely the perfect size imo.
The 416ci kits are done with stroker cranks. They don't 'open up' the cylinders to get the ci bump.
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Old Jul 19, 2016 | 02:23 PM
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Originally Posted by yonks8365
After discussing it with my shop and my budget, i decided not to do the 416. Im not looking to make a bunch more power, more concerned with having safe power.

Going with Weisco pistons and Callies connecting rods and all arp hardware.

My goal is to get into the 9's in the qtr. I think i have the power to do it as long as i can hook.
Did u go same compression or lower
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Old Jul 19, 2016 | 02:43 PM
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I'm 12.1 cr on stock bottom end and around 10lbs..... I run e40-e65 and 10gph of meth at 5lbs...

If I ran high boost I would lower the CR.. The tuning window opens up too
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Old Jul 19, 2016 | 09:23 PM
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Originally Posted by Suns_PSD
The 416ci kits are done with stroker cranks. They don't 'open up' the cylinders to get the ci bump.
look at the piston size, yes they are. I would leave stock cubes and if a pump/meth car go down 1 full point on compression.
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Old Jul 21, 2016 | 12:26 AM
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Originally Posted by Seannyc
Did u go same compression or lower
Going with same compression
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Old Jul 21, 2016 | 10:19 PM
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[QUOTE=yonks8365;1592652895]I have a 2015 z51 a8
I have h,c,i and a a&a ti kit making 780hp 658tq.

Im getting ready to do pistons and rods but been thinking about going with a 416 since the motor will be out.

What are all the pros and cons associated
with going to a 416?

If you are keeping the TI you are probably close to its limit. I have a TI and am over spinning it slightly and it is done at 15lbs. I am running 10.5.1 forged pistons with a small cam and a single meth nozzle set up. Forged pistons will be more for safety than a big bump in power with the TI. Now if you
jump up to a Ysi then you can kick up the boost and expect a big bump in power. I have not jumped to a Ysi yet because of fueling. Hopefully someone will come out with some better fuel system options soon. 780 out of a auto with a stock bottom end is impressive!
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Old Jul 22, 2016 | 09:40 AM
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[QUOTE=Silverboost;1592678626]
Originally Posted by yonks8365
I have a 2015 z51 a8
I have h,c,i and a a&a ti kit making 780hp 658tq.

Im getting ready to do pistons and rods but been thinking about going with a 416 since the motor will be out.

What are all the pros and cons associated
with going to a 416?

If you are keeping the TI you are probably close to its limit. I have a TI and am over spinning it slightly and it is done at 15lbs. I am running 10.5.1 forged pistons with a small cam and a single meth nozzle set up. Forged pistons will be more for safety than a big bump in power with the TI. Now if you
jump up to a Ysi then you can kick up the boost and expect a big bump in power. I have not jumped to a Ysi yet because of fueling. Hopefully someone will come out with some better fuel system options soon. 780 out of a auto with a stock bottom end is impressive!
What Upper/Lower Pulley combo are you running to get 15lbs out of your V3 TI?
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Old Jul 22, 2016 | 01:36 PM
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Originally Posted by yonks8365
I have a 2015 z51 a8
I have h,c,i and a a&a ti kit making 780hp 658tq.

Im getting ready to do pistons and rods but been thinking about going with a 416 since the motor will be out.

What are all the pros and cons associated with going to a 416?

Im not made of money otherwise i just go a head a do it.

Your thoughts are much appreciated
Eric
What are you doing for fuel? I'm assuming you're running meth, but did you do any other fuel upgrades to support the power? What kind of boost are you running to achieve these numbers?

I'm a M7 NA build at 550rwhp now and am considering adding an A&A or ECS kit and meth.
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Old Jul 23, 2016 | 12:46 PM
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Originally Posted by Elite275
What are you doing for fuel? I'm assuming you're running meth, but did you do any other fuel upgrades to support the power? What kind of boost are you running to achieve these numbers?

I'm a M7 NA build at 550rwhp now and am considering adding an A&A or ECS kit and meth.
11lbs boost. My na build on e85 was 533.
I'm running a dual nozzle alky kit. Not running e85 at the moment.

When it goes in for rods and pistons in august i will be doing lt4 injectors and fuel pump as well.
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Old Jul 24, 2016 | 09:40 AM
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[QUOTE=jacksnorm;1592680551]
Originally Posted by Silverboost

What Upper/Lower Pulley combo are you running to get 15lbs out of your V3 TI?
3.15 upper and 8.25 lower. I have a V1 TI.
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