"GAPN U" Is Getting Twins

All about GM cars. Buick, Chevy, GMC, Cadillac
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HardcoreABN
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Joined: Sun Mar 19, 2017 9:39 pm
Location: Green Bay, WI



So my C5 has been down for about a year now. Started swapping from heavy nitrous to twin turbo but ended up being medically retired from the Army and moving across the country in the middle of the build...This too has taken a life of its own....what was going to be a simple "pull the nitrous off, put the twin turbo kit and new injectors and another pump on" turned into:

New cam / springs / lifters
New coated rod / main / cam bearings
New tool steel wrist pins (and the necessary rebalance)
BIG upgrade to the fuel system
Swap to a LQ4 block and new ARP2000 head studs
Power Steering Cooler delete
Front sway bar delete
Air Bag steering wheel delete
Adding an oil cooler

Specs on the build:

402 LQ4 11.2:1 compression
Wiseco Pistons with tool steel wrist pins, Callies Compstar crank and rods
ARP everything
CNC LS3 heads with BTR .660 Platinum springs
Custom BTR cam
Holley High Ram
Fuel Injector Clinic 1650s
Single Walbro 450 in-tank pump (will be twin at a later date)
External Magnafuel 4303 on a boost reference switch
Return Style fuel system
Huron Speed C5 Twin Turbo Kit with CTS-V AC conversion - Huron Speed sponsored me on this kit
321 stainless hotside
4.5" Bell intercooler
Twin Precision 6766 CEAs .96 A/R

I am shooting for 8.90 with a manual trans....This is going to be a tall order and will be hard, but the car will be capable.

Current Personal best for this car is 10.89 @ 132 1.64 60' on a 100 shot with a weak / slow ramp - was still tuning it


Personal Best NA was 11.0 @ 130 1.53 60'




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Last edited by HardcoreABN on Mon Aug 07, 2017 7:20 am, edited 1 time in total.

402 LQ4- Callies Compstar crank/rods, Wiesco pistons, 11.2:1 c/r, CNC LS3 heads, custom BTR cam, Huron Speed twin turbo kit with Precision 6766 CEAs, Monster LT1-R Street Twin....
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maniacmechanic
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Joined: Thu Nov 17, 2016 11:26 pm



Nice Hardcore.
I have been following your Twin Turbo Build on Facebook.

I would have used a Lower static compression ratio but LS & X guys still like 11.0 to 1 static with Boost.

When you set compression to 7.0 -7.5 :1 its possible to run 45-51 Psi Boost.
But that would likely be more than the LQ4 block can handle.

Top Fuel engines have just 5.0 :1 static compression ratio.
High Boost engines on Nitromethane.

The LCA on the cam your using must be 122-128 spread.

Its a tight package the Twin Turbo layout on your C5.
Like the old Twin Turbo Callaway Corvettes had the Turbos, down Low.

8's are a Tall Order.
I think you know you need a Rollcage. And it has to be certified.
Rules of course at track.
But also so You do not twist the Frame rails in the C5 and they stay Bent.

Need a Parachute also for 8's.

You have to pass a physical & driving test for 9's & faster NHRA.

Looking to trap 158-165 mph in 1/4 mile for 8's.
Fucken Fast.

You should upgrade to better Valves.
Turbo Boost Is hard on them.
Especially the exhaust Valve.
Inconel 751 or better.
Ferrea Super Alloy Valves.
Manley XH428 exhaust valves.

Get an extra $3000 cash Manley High Temp Orange Titanium Intake & Exhaust Valves.

Exhaust valves often get to over 2000 F Hot on High Boost engines.
The Stainless steel used in Normal aspirated engines is seriously compromised weakened, Tensile strength drops off immediately.
Drop a valve in worse case scenario, Bad shit happens then as you know.

Ferrea Super Alloy Valves are similar to Inconel 751 But Better.
More affordable than Titanium Valves.

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maniacmechanic
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Joined: Thu Nov 17, 2016 11:26 pm



My Bud Crazy Ed is fabricating full time now out of his Garage in Joliet Hardcore.

Has a 5.0 Stang in there now.
He cut the entire floor out and entire rear half of the car.
One Big shell with doors and thats it.
He said is building all from scratch.
A Huge project.

Its getting a 1,000 HP Big Block Chevy 540 ci.

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maniacmechanic
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Joined: Thu Nov 17, 2016 11:26 pm



Its arguable Hardcore but Multi stage Fuel pumps work Ok when all is working as it should.

Simple is better I think.

The Mother Fucker Is going to suck down Gasoline Or Alcohol like No tomorrow running 8's.

Belt Drive Fuel Pump is the Best.

Need $$$$ of course .....

Race Fuel Cell Is Awesome too.

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maniacmechanic
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Joined: Thu Nov 17, 2016 11:26 pm



Also to use Titanium valves in Aluminum heads You Must use Berrylenium Copper Seats for Intake & Exhaust Valves Hardcore.
The Stellite seats stock are incompatible.

With Vintage Iron heads with intergral cast iron seats you can use TItanium valves as is.
Like my Trans Am RAIV heads.

Titanium valves only compatible with Berrylenium Copper and Cast iron seats.

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VFPreacher
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Very nice.

Poncherello
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Joined: Mon Oct 03, 2016 10:15 pm



I hope Junkcunt is signed on to help with that build. He's the best mechanic around, just ask him and he'll tell you that. He can also put a wash on that with his shine box like nobody's business.....it's a win win

Did you know it takes a 4 part video for someone to say use Windex to clean your windows. :lol:
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HardcoreABN
Pinky Finger
Posts: 43
Joined: Sun Mar 19, 2017 9:39 pm
Location: Green Bay, WI



Poncherello wrote:I hope Junkcunt is signed on to help with that build. He's the best mechanic around, just ask him and he'll tell you that. He can also put a wash on that with his shine box like nobody's business.....it's a win win



He wouldn't be interested....No Corvette can be improved upon from what the GM Engineers designed...per his own words....ANY aftermarket parts and you will have no reliability....funny thing is....I would take my car after this build and go coast to coast without hesitation or worry about its reliability.


I got the block mostly prepped to go to the body shop to get sprayed, should have it there tomorrow - will finish prepping it in the morning.

402 LQ4- Callies Compstar crank/rods, Wiesco pistons, 11.2:1 c/r, CNC LS3 heads, custom BTR cam, Huron Speed twin turbo kit with Precision 6766 CEAs, Monster LT1-R Street Twin....
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HardcoreABN
Pinky Finger
Posts: 43
Joined: Sun Mar 19, 2017 9:39 pm
Location: Green Bay, WI



Block is at the body shop, should be getting sprayed Friday or Monday....the last bearings I am waiting on get here Monday. Put the primer on my hot side, will paint it tomorrow. Just couldn't deal with the hot side being white haha. All I have to do yet before I can put it together is to check ring gaps - and hope they are a little tight with the new block so I can open them up instead of replacing the brand new rings I have.

402 LQ4- Callies Compstar crank/rods, Wiesco pistons, 11.2:1 c/r, CNC LS3 heads, custom BTR cam, Huron Speed twin turbo kit with Precision 6766 CEAs, Monster LT1-R Street Twin....
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HardcoreABN
Pinky Finger
Posts: 43
Joined: Sun Mar 19, 2017 9:39 pm
Location: Green Bay, WI



Block still isn't painted, gonna go to the body shop in the morning and find out what the hold up is.

Got the oil pan set up, thinking of fabricating a heat shield to go down the sides. Lingenfelter oil block that will feed my oil cooler, temp gauge, and turbos.

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New intake showed up too

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402 LQ4- Callies Compstar crank/rods, Wiesco pistons, 11.2:1 c/r, CNC LS3 heads, custom BTR cam, Huron Speed twin turbo kit with Precision 6766 CEAs, Monster LT1-R Street Twin....

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