TT Ls or procharger bbc
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Staging Lane
Joined: May 2009
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TT Ls or procharger bbc I'm in the middle of a engine decision. I have a chevelle project that's pretty much finished besides the engine. I'm stuck between a twin turbo Ls and a big cubic inch bbc. I want something about 8-850hp. But for the price it would cost to build a bbc bbc with that power it probably will cost the same to build a tt ls...What you guys think?
If you drive it much I’d say ls for the better package at that level. If it’s mostly straight line and not driving it 60 miles each way to car events routinely then a NA bbc would get you to the power level. A mild 454 with a single turbo would be an easy choice to that power level also.
What do you want to do with the car?
Do you like carburetors or fuel injection?
If you are good with carbs then the BBC might be less hassle than setting up and tuning fuel Injection for you. If your good with fuel injection then LS.
Do street ability and decent gas mileage matter? If so that favors an LS set up.
How importance is handling? Less weight is good and LS will be lighter.
Seems to me basically
Drag racing - big cube 600+ CID BBC and spray
Nostalgia / Originality / Resell value - BBC
Daily Driver - LS
Pro Tour - LS
Do you like carburetors or fuel injection?
If you are good with carbs then the BBC might be less hassle than setting up and tuning fuel Injection for you. If your good with fuel injection then LS.
Do street ability and decent gas mileage matter? If so that favors an LS set up.
How importance is handling? Less weight is good and LS will be lighter.
Seems to me basically
Drag racing - big cube 600+ CID BBC and spray
Nostalgia / Originality / Resell value - BBC
Daily Driver - LS
Pro Tour - LS
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TECH Junkie
Joined: Jul 2015
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I'm in the middle of a engine decision. I have a chevelle project that's pretty much finished besides the engine. I'm stuck between a twin turbo Ls and a big cubic inch bbc. I want something about 8-850hp. But for the price it would cost to build a bbc bbc with that power it probably will cost the same to build a tt ls...What you guys think?
Launching!
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From: █▬█ █▄█ █▬█ █▄██▬█ █▄█ █▬█ █▄█
Launching!
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Comparing a single and twins of the same design & same airflow capability (turbine and compressor), the twins will spool faster. The inertia and the resistance to spinning up is proportionate to the mass and it's radius of gyration (the radius at which you can put the whole mass of the rotating assembly and have something that acts the same way, making calculations easier), actually by the square of the radius of gyration * the mass'¦ in other words, making the diameter of the wheel larger causes a bigger changing in inertia then anything else.
That being said, the twins will spool faster, but a smaller wheel of the same design tends to be less efficient.
When it comes down to it, we're discussing 'big V8's' which make plenty of torque making lots of boost off the line a more of a problem then an advantage and optimum will be the most efficient setup that will supply the air you need to make the power you want to make and can be packaged in the engine bay. (in other words, the least number of big turbos that you can fit/plumb)
That being said, the twins will spool faster, but a smaller wheel of the same design tends to be less efficient.
When it comes down to it, we're discussing 'big V8's' which make plenty of torque making lots of boost off the line a more of a problem then an advantage and optimum will be the most efficient setup that will supply the air you need to make the power you want to make and can be packaged in the engine bay. (in other words, the least number of big turbos that you can fit/plumb)
TECH Junkie
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It's just hard to do. Unless it's some high strung mountain motor, it won't do it. Here's an example in the vid, motor makes 1100 on the stand..... and i can assure you, he paid a kings ransom just to make that. The average joe ain't putting down 800rwhp na. Can it be done..... yes. But the vast majority of people can't afford to do so. Just go small LS turbo and be done with it. This isn't BBC but it's close enough in Cube size.
TECH Junkie
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Here's the thing, that lsx with similar cubes I'm sure is more efficient than just a plain Jane BBC 454, and it doesn't eclipse 800rwhp by much. And know this, that guy has the latest and greatest of EVERYTHING in his motor setup.