Turbo in swap suggestions
Thread Starter
Staging Lane
Joined: Mar 2024
Posts: 63
Likes: 18
From: Central Oregon
I'd do 2" hotside with the billet VS 7875.
Response will be fast and carry you to your rpm limit easily.
Spend a little money on the down pipe too, maybe 4" from the turbo with a cutout of some kind under the truck then to 3" running out to the bumper.
A free-flowing down pipe will really help spool.
Your combo on pump gas I'd keep it around 10-12 psi, I push 14-15 psi with mine now but it's more of a top end killer with an A2W I/C so different combos.
You can always add a water/meth kit later for a few extra pounds and piece of mind.
Response will be fast and carry you to your rpm limit easily.
Spend a little money on the down pipe too, maybe 4" from the turbo with a cutout of some kind under the truck then to 3" running out to the bumper.
A free-flowing down pipe will really help spool.
Your combo on pump gas I'd keep it around 10-12 psi, I push 14-15 psi with mine now but it's more of a top end killer with an A2W I/C so different combos.
You can always add a water/meth kit later for a few extra pounds and piece of mind.
wow, you really think 2” hot pipe?
Oh yeah, my current car is a T6 setup with 2 1/4" hotside and it'll rev out to 7,500+ rpm easy.
You aren't anywhere that rpm wise or power wise so 2" would be ideal imo, easier to package and response would be fast.
Paging @Forcefed86 as he's actually used 2" before and can provide real world feedback.
You aren't anywhere that rpm wise or power wise so 2" would be ideal imo, easier to package and response would be fast.
Paging @Forcefed86 as he's actually used 2" before and can provide real world feedback.
I think location is most important, the farther is it from the turbo, the longer it will live.
A friend of mine had his right off the turbo, it lasted about a year before it stopped working.
I had mine right under the driver floorboard about where my feet were, and it was good for four years until I sold the car, still made a huge difference in spool with my full 3" exhaust.
Mine was an electric QTP, never gave me any issues, others who use them regularly like Badlandz as well.
There are also vacuum/boost operated ones if you don't want electric, I prefer electric because then I can open it up while idling through car shows.
A friend of mine had his right off the turbo, it lasted about a year before it stopped working.
I had mine right under the driver floorboard about where my feet were, and it was good for four years until I sold the car, still made a huge difference in spool with my full 3" exhaust.
Mine was an electric QTP, never gave me any issues, others who use them regularly like Badlandz as well.
There are also vacuum/boost operated ones if you don't want electric, I prefer electric because then I can open it up while idling through car shows.
Unless you are planning on over 900ish crank HP, 2" is plenty. You are just giving up response and real estate and money going larger in my experience. Makes a pretty big difference "spool wise" going from a 2.5" merged to a 2" divided. To the point you can run a larger T6 turbo for less overall back pressure and more power per pound. While having similar "spool" as the T4 in most cases. I ran 2" on a 370" motor no prob into the 8.6x range @ 160. Also on 4.8 and 5.3 setups to similar MPH all with 1.32 T6 S400 frame turbos.
If you want the pops and bangs in my (experience anyway) you need a decent amount of RPM and an aggressive cut RPM range. I don't have a Holley, but I assume the fields are similar to the megasquirt for "soft" and "hard" timing cut zones on the 2 step.
If you want the pops and bangs in my (experience anyway) you need a decent amount of RPM and an aggressive cut RPM range. I don't have a Holley, but I assume the fields are similar to the megasquirt for "soft" and "hard" timing cut zones on the 2 step.
Last edited by Forcefed86; Oct 25, 2024 at 09:32 AM.
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Verdad Gallardo Kinda depends how nice of a hotside you made and how long it takes ya to make one. Its worthwhile IMO. But if I had a ton of hours in a nice SS TIG'd 2.5 setup, id roll with that. I mig'd a mild steel setup in a few hours with factory manifolds and it held up 8+ years or so on about 4 different engines. Wasn't pretty, but was super functional and bullet proof. Also able to double wrap it (or more) because its so tiny. So it was completely covered as well. I paint all my piping and wrap with BBQ paint. Makes it last a lot longer and sheds water/oil.
Thread Starter
Staging Lane
Joined: Mar 2024
Posts: 63
Likes: 18
From: Central Oregon
Kinda depends how nice of a hotside you made and how long it takes ya to make one. Its worthwhile IMO. But if I had a ton of hours in a nice SS TIG'd 2.5 setup, id roll with that. I mig'd a mild steel setup in a few hours with factory manifolds and it held up 8+ years or so on about 4 different engines. Wasn't pretty, but was super functional and bullet proof. Also able to double wrap it (or more) because its so tiny. So it was completely covered as well. I paint all my piping and wrap with BBQ paint. Makes it last a lot longer and sheds water/oil.
Last edited by Oneshotkyle; Oct 25, 2024 at 11:08 AM.
TECH Regular
Joined: Dec 2022
Posts: 444
Likes: 158
Kinda depends how nice of a hotside you made and how long it takes ya to make one. Its worthwhile IMO. But if I had a ton of hours in a nice SS TIG'd 2.5 setup, id roll with that. I mig'd a mild steel setup in a few hours with factory manifolds and it held up 8+ years or so on about 4 different engines. Wasn't pretty, but was super functional and bullet proof. Also able to double wrap it (or more) because its so tiny. So it was completely covered as well. I paint all my piping and wrap with BBQ paint. Makes it last a lot longer and sheds water/oil.
Use truck manifolds and if possible cut the pipe flanges off with them so then you just have to add pipe.
T4 Divided Inlet to 2" Schedule 40 Pipe Twin Ports Turbo Flange Merge S300 S366 | eBay
A divided T4 with a billet wheeled 7875 would spool stupid fast, my 2.25" divided T6 with a billet S484 turbo spools faster than my old merged 2.5" T4 cast wheel 7875 setup.
Remote mount is tricky because you are adding a ton of length to the system. Obviously a 10ft 2" system with a ton of bends won't flow like a short run with minimal bends. Also depends if you are dividing the system form each manifold as well. But yea, a 500-600hp setup would be fine with a 2" remote hotside if setup properly. Helped a couple build that exact setup.
Yes and no. Depends on the power level you want. Sch40 flows more because it has an actual 2" ID. 16g 2" exh tubing ID is like 1.8".
Remote mount is tricky because you are adding a ton of length to the system. Obviously a 10ft 2" system with a ton of bends won't flow like a short run with minimal bends. Also depends if you are dividing the system form each manifold as well. But yea, a 500-600hp setup would be fine with a 2" remote hotside if setup properly. Helped a couple build that exact setup.
Remote mount is tricky because you are adding a ton of length to the system. Obviously a 10ft 2" system with a ton of bends won't flow like a short run with minimal bends. Also depends if you are dividing the system form each manifold as well. But yea, a 500-600hp setup would be fine with a 2" remote hotside if setup properly. Helped a couple build that exact setup.
It looked like there was plenty of room in there?
Thread Starter
Staging Lane
Joined: Mar 2024
Posts: 63
Likes: 18
From: Central Oregon
Yes and no. Depends on the power level you want. Sch40 flows more because it has an actual 2" ID. 16g 2" exh tubing ID is like 1.8".
Remote mount is tricky because you are adding a ton of length to the system. Obviously a 10ft 2" system with a ton of bends won't flow like a short run with minimal bends. Also depends if you are dividing the system form each manifold as well. But yea, a 500-600hp setup would be fine with a 2" remote hotside if setup properly. Helped a couple build that exact setup.
Remote mount is tricky because you are adding a ton of length to the system. Obviously a 10ft 2" system with a ton of bends won't flow like a short run with minimal bends. Also depends if you are dividing the system form each manifold as well. But yea, a 500-600hp setup would be fine with a 2" remote hotside if setup properly. Helped a couple build that exact setup.
Thread Starter
Staging Lane
Joined: Mar 2024
Posts: 63
Likes: 18
From: Central Oregon
I dunno man, that's a lot of coin.
I'd rather do factory manifolds for a fraction of the cost and put that money back into something else.
I don't like to skimp on parts that can blow up my engine if they fail so I buy name brand wastegates.
I've run Tial and Turbosmart with great results, JGS also makes a good one.
If you're set on running the Holley manifolds, I'd get an elbow with the wastegate port right off the bend to give it the best priority.
You'll get the best boost control there.