6.2 Turbo Recommendation
Thread Starter
On The Tree
Joined: Mar 2007
Posts: 113
Likes: 14
From: Calgary, AB
6.2 Turbo Recommendation OK I've searched for a good hour here and not many hits on 6.2 turbo combos, I realize 6.0's are much more common. We've done 3 streetcar builds with 6.0/Summit 8706 cam/7875 setups, always on pump gas only, and ran 650-700 rwhp on all of them at 10-12 psi, nice and safe. Our next build is a 6.2 (Buick Grand National clone for the street) and I'm wondering if I should go a little bigger, maybe a VSR 80mm 87x82? Will be harder to package cause it's bigger, so maybe not worth it?
Thoughts?
Thoughts?
Last edited by Blacksix; Nov 20, 2023 at 06:26 PM.
For me personally, I like the ability to spin the rpm up higher in the 7,000-7,500 rpm range and a 7875 on a 6.2 won't do that.
I'd be looking at a T6 Borg S4xx with a billet compressor wheel in the 76-80mm range with the 96mm turbine wheel.
The 6.2 will make plenty of power out of boost with the turbo coming in nice and linear and making lots of power into the upper rpm range if you want it too without pushing it too hard.
No one stays at 600hp for long, my first turbo build was only looking for 550whp, that lasted for about five minutes and ended at 700+whp on pump gas only.
Sold that car and picked up my buddies' car with a T6 setup and now that one is well beyond 700whp on pump gas.
You see a pattern here lol?
I'd be looking at a T6 Borg S4xx with a billet compressor wheel in the 76-80mm range with the 96mm turbine wheel.
The 6.2 will make plenty of power out of boost with the turbo coming in nice and linear and making lots of power into the upper rpm range if you want it too without pushing it too hard.
No one stays at 600hp for long, my first turbo build was only looking for 550whp, that lasted for about five minutes and ended at 700+whp on pump gas only.
Sold that car and picked up my buddies' car with a T6 setup and now that one is well beyond 700whp on pump gas.
You see a pattern here lol?
Thread Starter
On The Tree
Joined: Mar 2007
Posts: 113
Likes: 14
From: Calgary, AB
Understood re: 7000-7500 rpm. Viren has suggested to possibly step right up to the 80mm - 96x88. I don't want to lose the tire-smoking streetability but also don't want to choke the 6.2. Am I overthinking it? The easy route would be to use the proven 7875 NextGen billet 1.25. Boost levels will remain at 10-12 psi ... for now ...
An S480 is a monster to fit neatly under the hood in a G-body. I think of them more for pickup trucks where there's lots of space and the weight doesn't matter. Grand nationals have plastic inner fenders as well, so I'd like to keep the turbo away from that.
An S480 is a monster to fit neatly under the hood in a G-body. I think of them more for pickup trucks where there's lots of space and the weight doesn't matter. Grand nationals have plastic inner fenders as well, so I'd like to keep the turbo away from that.
See that's the caveat, "boost levels will remain at 10-12 psi for now...."
That's not my personality, I go straight to max boost on whatever fuel I'm using because reasons lol.
More boost means the turbo will choke sooner if its too small.
Summit has come out with some 96mm turbine T4 units that might be worth looking into.
Perhaps design and build the hot side around a larger frame turbo, run the 7875 for now and when you want to upgrade then you don't have to remake the hot side, maybe only the downpipe.
That's not my personality, I go straight to max boost on whatever fuel I'm using because reasons lol.
More boost means the turbo will choke sooner if its too small.
Summit has come out with some 96mm turbine T4 units that might be worth looking into.
Perhaps design and build the hot side around a larger frame turbo, run the 7875 for now and when you want to upgrade then you don't have to remake the hot side, maybe only the downpipe.
TECH Enthusiast
Joined: Feb 2020
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6.2 L is only 3.33% lager that a 6L so if your goal is similar performance to the other combinations that you built 7875 will work fine especially if space /size is a concern. Did the others have the .96 housing or the 1.25 ? Going with the larger 1.25 would be a good idea.
6.2 L is only 3.33% lager that a 6L so if your goal is similar performance to the other combinations that you built 7875 will work fine especially if space /size is a concern. Did the others have the .96 housing or the 1.25 ? Going with the larger 1.25 would be a good idea.
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Joined: Dec 2004
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From: Florida
I’m putting together a 6.2 right now to replace a 5.3 with on3 88.
I’m going twins using flipped ls3 manifolds. Turbos will be from vs racing somewhere between 6262s and 7070s depending on how the deals work out when I’m ready.
Over the years I’ve done a couple single kits and a few twin kits and I’m a big fan of twins but getting real good small turbos was expensive. My wagon is twins with eBay gt3582 6162 cast junk. I was just looking through vs racing and they just released a whole bunch of real nice looking billet options in the 48 to 68 range which I bet would be killer on a 6.2 depending on where you want to be hp wise. Cool bonus is quite a few are available in mirror layout.
I’m going twins using flipped ls3 manifolds. Turbos will be from vs racing somewhere between 6262s and 7070s depending on how the deals work out when I’m ready.
Over the years I’ve done a couple single kits and a few twin kits and I’m a big fan of twins but getting real good small turbos was expensive. My wagon is twins with eBay gt3582 6162 cast junk. I was just looking through vs racing and they just released a whole bunch of real nice looking billet options in the 48 to 68 range which I bet would be killer on a 6.2 depending on where you want to be hp wise. Cool bonus is quite a few are available in mirror layout.
Thread Starter
On The Tree
Joined: Mar 2007
Posts: 113
Likes: 14
From: Calgary, AB
I checked out his threads and found some good info. More of a drag guy though it seems. I posed the question, we'll see if he has any input.