5.3L torque monster...
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Joined: Apr 2006
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From: in my neighborhood
Sounds like your over thinking it. This isn’t the NA world and none of those “fancy” parts are needed for your goal. The engine becomes the cheap part when you are only targeting 550-600whp. Get yourself a gen4 5.3. Run head studs and decent head gaskets. Leave the long block alone. 67-70mm single and a mild cam…done. Look at the mileage stock48 is getting out of his unmodified short block builds. Making more power than your goal at heavier weights.
If you’re going to spend the extra cash on a forged rotating assy and heads, you’d be money ahead buying a gen4 6.0. With a small cam it would meet your power goals with little boost. The added cubes will help with your “insta-spool” goals.
If you’re going to spend the extra cash on a forged rotating assy and heads, you’d be money ahead buying a gen4 6.0. With a small cam it would meet your power goals with little boost. The added cubes will help with your “insta-spool” goals.
Thread Starter
Joined: Mar 2003
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From: Little Austin
I guess maybe it is because this forum has a lot of drag racers...
Andrew
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Joined: Nov 2003
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From: Norn Iron
I see no problem whatsoever in achieving torque like the graph above, as said, you just need to use small turbochargers.
Something like a pair of these would do. If you could hunt down a pair from a Nissan 200SX, they use turbos like these so you might find some cheap
http://www.atpturbo.com/mm5/merchant...egory_Code=GRT
It's just so easy to get caught up in the bigger is better. But when you look at OEM stuff, and even more so diesels....the turbochargers they are using these days to get say 200hp from an engine...they are absolutely miniscule.
And for good reason...so they can spool fast.
I have never seen a torque curve like that on a turbo set-up. If there is a way to get that curve from turbo's I'm all ears. I am switching to a turbo from a magnacharger so I am used to all that grunt down low with a flat torque curve.
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The housing was a 1.32. We tried to give it as much of a chance up top as possible. I don't have any other graph. The car would hit full boost before 3500 rpm. I ran the car just on the gate. No controller. It was a very simple setup. I can post a picture of the setup later today. Keep in mind this was on dyno dynamics and not a dynojet.
Last edited by w94rx7tt; Feb 10, 2015 at 08:09 AM.
More of the setup with the 67mm
https://ls1tech.com/forums/vehicle-c...6-8-8-irs.html
Turbo was a 6766. Here are housing options for you based off a quick search -
http://www.extremeturbosystems.com/P...bocharger.html
https://ls1tech.com/forums/vehicle-c...6-8-8-irs.html
Turbo was a 6766. Here are housing options for you based off a quick search -
http://www.extremeturbosystems.com/P...bocharger.html
Thread Starter
Joined: Mar 2003
Posts: 10,610
Likes: 1,882
From: Little Austin
More of the setup with the 67mm
https://ls1tech.com/forums/vehicle-c...6-8-8-irs.html
Turbo was a 6766. Here are housing options for you based off a quick search -
http://www.extremeturbosystems.com/P...bocharger.html
https://ls1tech.com/forums/vehicle-c...6-8-8-irs.html
Turbo was a 6766. Here are housing options for you based off a quick search -
http://www.extremeturbosystems.com/P...bocharger.html
Look at the Ford v6 EcoBoost. That engine uses twin Garrett GT18s. Those are tiny little turbos. Torque curve:
Sure, it takes a nose dive after 5000 RPM, but keep in mind that this is only a 3.5L engine. These engines also use VVT, which I am sure helps with the broad torque curve.
The side benefit of building such an engine is that redline can be kept under 6000RPM. This extends the life of just about all engine components.
Andrew
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Joined: Nov 2003
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Likes: 185
From: Norn Iron
Exactly my point.
The 6766 is also a good example...it sounds like a small turbo for the engine as a single, but it still isnt giving the sort of torque you seem to be after...ie like a maggie for example.
As a single, a 6266 with a smallish turbine housing is probably the way to go.
The 4094R is very close dimensionally to a S366 so can only imagine it being even lazier than the 6766 Precision.
As said, find a pair of GT28's and try those. Or something similar from say a 2.0 4 cyl car that is fairly common over there.
Essentially you're using 2 x 2.6 litre engines, so if you sourced OEM turbos from a 2.0 motor...you can be sure they'll spool like a rocket.
If aftermarket twins, something in the very low 50mm inducer range, maybe even high 40's
The 6766 is also a good example...it sounds like a small turbo for the engine as a single, but it still isnt giving the sort of torque you seem to be after...ie like a maggie for example.
As a single, a 6266 with a smallish turbine housing is probably the way to go.
The 4094R is very close dimensionally to a S366 so can only imagine it being even lazier than the 6766 Precision.
As said, find a pair of GT28's and try those. Or something similar from say a 2.0 4 cyl car that is fairly common over there.
Essentially you're using 2 x 2.6 litre engines, so if you sourced OEM turbos from a 2.0 motor...you can be sure they'll spool like a rocket.
If aftermarket twins, something in the very low 50mm inducer range, maybe even high 40's
Keep in mind the maggie is on a 6.0, the tyrbo is on a 5.3. Would also need to know if the maggie is an auto and how stall might affect the initial torque curve vs the 6spd 5.3 example.