5.3L torque monster...
02-02-2015, 07:22 PM
#1
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5.3L torque monster... I lurk in the Forced Induction section quite frequently and love all the builds here, from the DIY Sloppy Mechanics stuff to the race car builds, and the average street car. I've often thought that I wanted some sort of forced induction on my 1970 GTO (currently LS3 powered), but many of the builds here seem to focus on drag racing and thus the torque curves tend to peak later and HP is the goal.
For my GTO, this doesn't fit the bill, as it is a street car, built to drive, be comfortable, and handle decently. If I was to do twin turbos, I would want the response to be instant and the torque curve should look like a dining room table. In other words, I want it to respond like a roots blower, and the redline will be below 6000 RPM.
With that said, I was playing around on the BW "match bot" and came up with a combo for twins:
5.3L twin EFR6758s
This would obviously have to go on a forged short block and possibly some aftermarket heads and a matching cam, but damn...look at the estimated torque curve!
Any thoughts, ideas, suggestions are welcome.
Andrew
For my GTO, this doesn't fit the bill, as it is a street car, built to drive, be comfortable, and handle decently. If I was to do twin turbos, I would want the response to be instant and the torque curve should look like a dining room table. In other words, I want it to respond like a roots blower, and the redline will be below 6000 RPM.
With that said, I was playing around on the BW "match bot" and came up with a combo for twins:
5.3L twin EFR6758s
This would obviously have to go on a forged short block and possibly some aftermarket heads and a matching cam, but damn...look at the estimated torque curve!
Any thoughts, ideas, suggestions are welcome.
Andrew
02-02-2015, 07:51 PM
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Great turbo, I don't know if it would make that good torque down low but it would certainly be fun! I think you would probably run out of turbine up top also, but you could definitely hit 800whp. Would love to see this happen
02-02-2015, 08:26 PM
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This is exactly how I would describe my Chevelle. It takes a strong torque curve to move a heavy A-body. I will always vote for twin turbos for a streetcar. But I really like the shaker hood, so I would say put on a whipple and modify the hood to still work.
02-02-2015, 08:34 PM
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This post is purely hypothetical, and I don't want it to devolve into arguments between supercharging and turbo, or turbo brand, etc...
I am just seeing if anyone has done anything similar. The closest I can think of is Jim's 1970 Chevelle with the 6.0L and using twin stock GN turbos.
Andrew
02-02-2015, 08:51 PM
#6
How much power do you want?
When do you want boost to come in?
auto or manual?
Gearing?
The big power street guys don't want a flat torque curve. Insta-torque translates to instant tire smoke. It's pretty pointless to have your boost/power peak below 5k IMO.
Any speed under 70ish and over 13lbs my super mild 8.6:1 5.3/S475 would blow the tires off. This was a 29x12 slick with 3.10 gears and a powerglide.
When do you want boost to come in?
auto or manual?
Gearing?
The big power street guys don't want a flat torque curve. Insta-torque translates to instant tire smoke. It's pretty pointless to have your boost/power peak below 5k IMO.
Any speed under 70ish and over 13lbs my super mild 8.6:1 5.3/S475 would blow the tires off. This was a 29x12 slick with 3.10 gears and a powerglide.
02-02-2015, 08:58 PM
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How much power do you want?
When do you want boost to come in?
auto or manual?
Gearing?
The big power street guys don't want a flat torque curve. Insta-torque translates to instant tire smoke. It's pretty pointless to have your boost/power peak below 5k IMO.
Any speed under 70ish and over 13lbs my super mild 8.6:1 5.3/S475 would blow the tires off. This was a 29x12 slick with 3.10 gears and a powerglide.
When do you want boost to come in?
auto or manual?
Gearing?
The big power street guys don't want a flat torque curve. Insta-torque translates to instant tire smoke. It's pretty pointless to have your boost/power peak below 5k IMO.
Any speed under 70ish and over 13lbs my super mild 8.6:1 5.3/S475 would blow the tires off. This was a 29x12 slick with 3.10 gears and a powerglide.
It'll always be manual, with a 3.23 rear gear.
I want insta-torque, like a roots blower.
Andrew
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02-02-2015, 09:09 PM
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well I think to move almost 2 tons of streetcar, its the correct path.
Twin turbos, 4L80E, 3.73-3.55 gears, A/C, and comfy seats sounds like a great idea to me. Cupholders also, that's an important one!
And it looks great also......
Twin turbos, 4L80E, 3.73-3.55 gears, A/C, and comfy seats sounds like a great idea to me. Cupholders also, that's an important one!
And it looks great also......
02-02-2015, 09:53 PM
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https://ls1tech.com/forums/forced-in...lue-devil.html
Specs:
6.0L L92 heads 223/231 cam T4 6165s .68 A/R
24-2600 stall 80E 12bolt 3.73s
I was curious if you knew how much your GTO weighed ?
Specs:
6.0L L92 heads 223/231 cam T4 6165s .68 A/R
24-2600 stall 80E 12bolt 3.73s
I was curious if you knew how much your GTO weighed ?
02-02-2015, 09:57 PM
#13
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https://ls1tech.com/forums/forced-in...lue-devil.html
Specs:
6.0L L92 heads 223/231 cam T4 6165s .68 A/R
24-2600 stall 80E 12bolt 3.73s
I was curious if you knew how much your GTO weighed ?
Specs:
6.0L L92 heads 223/231 cam T4 6165s .68 A/R
24-2600 stall 80E 12bolt 3.73s
I was curious if you knew how much your GTO weighed ?
Andrew
02-02-2015, 10:44 PM
#14
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https://ls1tech.com/forums/forced-in...50-9-19-a.html
Stock 6.0 shortblock/heads with single 80mm cast wheel and mild cam. Made 4 digit torque numbers on 19 PSI. At 22 PSI he slightly bent the stock rods. Probably 1100+ ft lbs. He bent them riding the limiter a little too long.
Getting torque figures like you want with a properly built 5.3 shouldn't be a problem. It'll have to be a carefully planned setup right out of the gate.
Stock 6.0 shortblock/heads with single 80mm cast wheel and mild cam. Made 4 digit torque numbers on 19 PSI. At 22 PSI he slightly bent the stock rods. Probably 1100+ ft lbs. He bent them riding the limiter a little too long.
Getting torque figures like you want with a properly built 5.3 shouldn't be a problem. It'll have to be a carefully planned setup right out of the gate.
02-04-2015, 05:16 AM
#16
9 Second Club
I lurk in the Forced Induction section quite frequently and love all the builds here, from the DIY Sloppy Mechanics stuff to the race car builds, and the average street car. I've often thought that I wanted some sort of forced induction on my 1970 GTO (currently LS3 powered), but many of the builds here seem to focus on drag racing and thus the torque curves tend to peak later and HP is the goal.
For my GTO, this doesn't fit the bill, as it is a street car, built to drive, be comfortable, and handle decently. If I was to do twin turbos, I would want the response to be instant and the torque curve should look like a dining room table. In other words, I want it to respond like a roots blower, and the redline will be below 6000 RPM.
With that said, I was playing around on the BW "match bot" and came up with a combo for twins:
5.3L twin EFR6758s
This would obviously have to go on a forged short block and possibly some aftermarket heads and a matching cam, but damn...look at the estimated torque curve!
Any thoughts, ideas, suggestions are welcome.
Andrew
For my GTO, this doesn't fit the bill, as it is a street car, built to drive, be comfortable, and handle decently. If I was to do twin turbos, I would want the response to be instant and the torque curve should look like a dining room table. In other words, I want it to respond like a roots blower, and the redline will be below 6000 RPM.
With that said, I was playing around on the BW "match bot" and came up with a combo for twins:
5.3L twin EFR6758s
This would obviously have to go on a forged short block and possibly some aftermarket heads and a matching cam, but damn...look at the estimated torque curve!
Any thoughts, ideas, suggestions are welcome.
Andrew
Their base kit uses a pair of small BW S200 units, but they offer even smaller units for better spool again
http://www.agpturbo.com/camaro-5-ss-agp-twin-turbo-kit/
With a pair of these they should spool very very fast and not cost the earth. Some of the billet FMW wheels on the Airwerks units are the same as the EFR's, although the turbine and bearing setup are obviously different with the EFR's...as is the price.
http://www.agpturbo.com/borg-warner-...-turbocharger/
Or didnt BW have some new stuff at PRI recently with the Airwerks units ? Not sure if there was smaller stuff.
02-05-2015, 10:07 PM
#19
If you're wanting that much tq down low, go ahead and install a 2.56 rear gear and run DR's all the time. This isn't "big block" torque...this is turbo torque. A whole 'nother level.
Awesome car btw, loved the links in your sig.
But either way +1 for cupholders!
Awesome car btw, loved the links in your sig.
But either way +1 for cupholders!
