March 18, 2025, 05:54:15 AM

Author Topic: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo LS3/DCT Daily Driver  (Read 146002 times)

Offline FC3S Murray

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #555 on: August 09, 2023, 10:33:39 PM »
Indeed, very well put together. My kind of build!


You most likely went into detail about the engine specs BUT what are the power goals/notable internal modifications?


That is going to be a lot of torque for the FC chassis.  :yay:



13 years of abuse and still running STRONG!

SRM Performance Tuning LLC
https://www.instagram.com/fc3s_murray/?hl=en

Offline shainiac

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #556 on: August 10, 2023, 07:07:31 AM »
Thanks, it's a stock LS3 block, heads, and crank. OEM LT4 forged rods, Summit (Wiseco) 4.070" ~9.4:1 forged pistons, LT1 lifters, 225/234 +115 cam, BTR dual valve springs/pushrods, LS9 head gaskets, and ARP 2000 head bolts. It's relatively"budget" for a built LS3.

I'm trying to be cheap and not upgrade the DCT clutch packs ($5500 for 1000wtq clutches!), so I'm limited to around 650-700wtq. The 5.3 I had before made that torque, but on ethanol. I'm hoping to make that on 93oct with the 6.2L. And since it's turbo, I can ramp boost in past peak torque and hopefully hold 650-700wtq to 7000, which should be around. 900whp. On pump gas, the 5.3 made around 620/600 wheel and was very usable on the street, but boost by gear and traction control are your friend.

Indeed, very well put together. My kind of build!


You most likely went into detail about the engine specs BUT what are the power goals/notable internal modifications?


That is going to be a lot of torque for the FC chassis.  :yay:
'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline freeskier7791

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #557 on: August 10, 2023, 10:24:57 AM »
your stainless welds are looking really good.  What valve are you using for the exhaust?  I want to do a valved exhaust on my car so I can actually drive it early in the morning.
https://www.youtube.com/thedriftingdad
1985 Mazda RX7 GSL Drift Car

CCVT

Online spacevomit

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #558 on: August 10, 2023, 02:57:35 PM »
That shit is nuts.

Offline Exidous

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #559 on: August 11, 2023, 04:02:46 PM »
your stainless welds are looking really good.  What valve are you using for the exhaust?  I want to do a valved exhaust on my car so I can actually drive it early in the morning.

You want Varex. Stock quiet closed full send open.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline shainiac

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #560 on: August 14, 2023, 08:04:20 AM »
The active muffler is about 3/4 done. Some of the welds are a PITA to get to, but I'll hopefully have it finished tonight. The cockeye'd angles are intentional, believe it or not. The overall height of the muffler is pretty large, so I needed to tip up the outlet so it's closer to the bumper.










'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline shainiac

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #561 on: August 21, 2023, 08:13:13 AM »
The exhaust is almost done. I was about 2" short of the 4" tubing I needed to connect the midpipe to the muffler.
Since I needed more tubing and have a bit of room, I'm going to add a 7"L bullet muffler before the existing muffler. I'm a little paranoid the "Loud" mode is going to be obnoxious with just one 10"L bullet muffler.

The double muffler is quite a bit taller than I realized and placed the exhaust tip pretty low in the bumper. I had planned to make the tip a 45* turndown like I had on my previous exhaust, but that only made the issue worse. So, I cut a 10* cheater angle in some straight 4" and angled the tip up to close the gap at the bumper. I don't quite know if I like it or hate it. I can still cut it a bit shorter and maybe throw an angle on it, but I don't really have a better option atm.

Also, I got tired of trying to bend exhaust hangers with a MAP torch and used the TIG. It takes seconds to get the rod glowing hot and bends easy in the vise. Welding wire is great for making templates too.










'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline digitalsolo

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #562 on: August 21, 2023, 08:50:04 AM »
The highest tech V8/FC around I think.   Loving the progress.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline Gunnytron

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #563 on: August 21, 2023, 09:52:15 AM »
Nice work on that exhaust.
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline shainiac

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #564 on: September 06, 2023, 01:08:19 PM »
More slow, but steady progress.
Exhaust is done, with the exception of the tip. I'm still not sure how I want to trim it and if I weld it now, it'll be difficult to cut later. I'll probably wait to get the car on the ground before trimming and welding.

The rest of the exhaust turned out pretty decent. I'm getting better with TIG, but it's still tough to bridge any kind of gap if the fitup isn't perfect. I made the mid section and rear section first and tried to connect the two. This was tough to get perfect fitup since the alignment needed some 3D pie cuts to get everything perfect. It still looks better than my normal MIG'd exhaust, so I'm fairly pleased with how it turned out. The rear section where it V-band's to the muffler required some weird bends to get ground clearance. I added a second 7" bullet muffler and jogged the exhaust up to make clearance for the v-band clamp. It looks a little strange, but there's decent clearance. Maybe 3" or more.
You can see I strung safety wire under the car where the wheels touch the pavement. That gives a pretty good visual of ground clearance.

I also insulated and wrapped the turbofolds and downpipes. The dimpled stainless was pretty easy to work with and I safety wired everything to keep it from rattling around.

Last big obstacle is charge piping and compressor cover mods. Unfortunately the G30 knockoffs don't have a v-band comp housing like the EFRs, so I can't final install the CHRAs since I'll be taking the comps on and off.

The ePowerSteering.com EPAS also showed up and is installed. Needs wired, but it fits under the dash well and has okay foot clearance.











'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline kinger

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #565 on: September 06, 2023, 01:39:32 PM »
Sick!  All of it! 

Hopefully the valve holds up, I am on my 3rd one in my compound boost project, I keep being told I got a "dud" and loud valves is covering each time but I still have to re weld it and mess around with it. 

Such a cool car you are building!
93 Touring, 6.3L, T56 Magnum, Mamo RPS BC2 clutch, FAST 90, NW 90TB TB, 8.8, samberg everything, AC, PS, TC, Cruise, LED Tails, HID head lights

Offline shainiac

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #566 on: September 06, 2023, 01:44:19 PM »
Are you using a Loudvalve on the turbo hotside? I don't think they'd hold up to pre-turbo pressures and heat. I've had one on the rear section of my exhaust as a cutout for 4 years with no issues. I'm also using the unbranded Chinese ones, fwiw. I think this one was $50 shipped from China for a 4", and they have any configuration imaginable. This one is normally-open, boost-close. So I can use my onboard air to control it with the ECU. I had my previous cutout working like this and it was awesome. I made 3 different modes, always closed, open when TPS>50%, and always open. And with onboard air, I could close it before startup so it's nice and quiet.
'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline Exidous

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #567 on: September 06, 2023, 06:26:32 PM »
Should be able to pwm the valve to get it variable.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Online spacevomit

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #568 on: September 08, 2023, 09:34:51 AM »
Individual EGTs? I always wanted to do that. Can that ECU do fuel trims per cylinder?

Offline shainiac

Re: Ten Pounds of Shit in a Five Pound Bag - Twin Turbo 5.3 Daily Driver Build
« Reply #569 on: September 08, 2023, 10:04:02 AM »
Yes it can, and it also has a dedicated ECU connector that are all built-in TC amps. No external EGT adapters or CAN boxes, just wire the TCs right to the ECU.
'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS