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

marco383

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.

jacksnorm

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.

Cordes Performance Racing

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.

robert miller

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.

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

robert miller

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...

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.

Suns_PSD

The 416ci kits are done with stroker cranks. They don't 'open up' the cylinders to get the ci bump.

Seannyc

Did u go same compression or lower

T/A KID

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

Cordes Performance Racing

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.

yonks8365

Going with same compression

Silverboost

[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!

jacksnorm

[QUOTE=Silverboost;1592678626]What Upper/Lower Pulley combo are you running to get 15lbs out of your V3 TI?

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.

yonks8365

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.

Silverboost

[QUOTE=jacksnorm;1592680551]3.15 upper and 8.25 lower. I have a V1 TI.