My somewhat coherent thread on the topic of street/strip turbo LS combinations.
08-30-2012, 10:30 PM
#101
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I forget the screen name here, but Ash tested multiple cams over several days on a stock head gen 1 @ ~1000 fwhp. He said the conv. split engine dyno'd better but the reverse split ET'd better. Note-Jim made about 1k w/ a 218/218 cam gen II.
09-02-2012, 04:59 AM
#103
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Just to try something different. I have a chance to trade straight up from my twin PTE62/62's for a PT74 GTQ, SP cover, and .96 AFR. One of the twins keeps going bad no matter what I do and I am tired of having it rebuilt. I have swapped to both sides of the engine and only one of them keeps going bad. I am done with it. The PTE 62's have a .58 AR
My car is in my signature. If I am using a stock 5.3, with head studs and LS9 gaskets, E85 and meth injection, no intercooler should the PT74 run as good as the twins? 15-20psi of boost. Also, would it do better with the XER273 cam I was using or better with the stock cam? Talking strip performance in both the 1/8th and 1/4. My twins went 118mph in the 1/8th and 140mph in the 1/4 but ran out of gear. This was at 20psi in a nearly 4,000lb chevelle.
Part of this straight up swap is me getting rid of my Vic jr intake and elbow for the Edelbrock Pro Flo XT in black powder coat. Don't necessarily think it is better but do think it is close enough and would look wicked in my engine bay on this car.
What you think? I realize this turbo isn't ideal but with the .96 AR and 75 mm compressor wheel I figured it would be almost perferct for a 5.3 as a single on a stock bottom end. Looking to be about where I was with the twins, roughly 700hp to the wheels.
My car is in my signature. If I am using a stock 5.3, with head studs and LS9 gaskets, E85 and meth injection, no intercooler should the PT74 run as good as the twins? 15-20psi of boost. Also, would it do better with the XER273 cam I was using or better with the stock cam? Talking strip performance in both the 1/8th and 1/4. My twins went 118mph in the 1/8th and 140mph in the 1/4 but ran out of gear. This was at 20psi in a nearly 4,000lb chevelle.
Part of this straight up swap is me getting rid of my Vic jr intake and elbow for the Edelbrock Pro Flo XT in black powder coat. Don't necessarily think it is better but do think it is close enough and would look wicked in my engine bay on this car.
What you think? I realize this turbo isn't ideal but with the .96 AR and 75 mm compressor wheel I figured it would be almost perferct for a 5.3 as a single on a stock bottom end. Looking to be about where I was with the twins, roughly 700hp to the wheels.
09-02-2012, 06:44 AM
#104
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Just to try something different. I have a chance to trade straight up from my twin PTE62/62's for a PT74 GTQ, SP cover, and .96 AFR. One of the twins keeps going bad no matter what I do and I am tired of having it rebuilt. I have swapped to both sides of the engine and only one of them keeps going bad. I am done with it. The PTE 62's have a .58 AR
My car is in my signature. If I am using a stock 5.3, with head studs and LS9 gaskets, E85 and meth injection, no intercooler should the PT74 run as good as the twins? 15-20psi of boost. Also, would it do better with the XER273 cam I was using or better with the stock cam? Talking strip performance in both the 1/8th and 1/4. My twins went 118mph in the 1/8th and 140mph in the 1/4 but ran out of gear. This was at 20psi in a nearly 4,000lb chevelle.
Part of this straight up swap is me getting rid of my Vic jr intake and elbow for the Edelbrock Pro Flo XT in black powder coat. Don't necessarily think it is better but do think it is close enough and would look wicked in my engine bay on this car.
What you think? I realize this turbo isn't ideal but with the .96 AR and 75 mm compressor wheel I figured it would be almost perferct for a 5.3 as a single on a stock bottom end. Looking to be about where I was with the twins, roughly 700hp to the wheels.
My car is in my signature. If I am using a stock 5.3, with head studs and LS9 gaskets, E85 and meth injection, no intercooler should the PT74 run as good as the twins? 15-20psi of boost. Also, would it do better with the XER273 cam I was using or better with the stock cam? Talking strip performance in both the 1/8th and 1/4. My twins went 118mph in the 1/8th and 140mph in the 1/4 but ran out of gear. This was at 20psi in a nearly 4,000lb chevelle.
Part of this straight up swap is me getting rid of my Vic jr intake and elbow for the Edelbrock Pro Flo XT in black powder coat. Don't necessarily think it is better but do think it is close enough and would look wicked in my engine bay on this car.
What you think? I realize this turbo isn't ideal but with the .96 AR and 75 mm compressor wheel I figured it would be almost perferct for a 5.3 as a single on a stock bottom end. Looking to be about where I was with the twins, roughly 700hp to the wheels.
09-02-2012, 09:10 AM
#106
Just to try something different. I have a chance to trade straight up from my twin PTE62/62's for a PT74 GTQ, SP cover, and .96 AFR. One of the twins keeps going bad no matter what I do and I am tired of having it rebuilt. I have swapped to both sides of the engine and only one of them keeps going bad. I am done with it. The PTE 62's have a .58 AR
My car is in my signature. If I am using a stock 5.3, with head studs and LS9 gaskets, E85 and meth injection, no intercooler should the PT74 run as good as the twins? 15-20psi of boost. Also, would it do better with the XER273 cam I was using or better with the stock cam? Talking strip performance in both the 1/8th and 1/4. My twins went 118mph in the 1/8th and 140mph in the 1/4 but ran out of gear. This was at 20psi in a nearly 4,000lb chevelle.
Part of this straight up swap is me getting rid of my Vic jr intake and elbow for the Edelbrock Pro Flo XT in black powder coat. Don't necessarily think it is better but do think it is close enough and would look wicked in my engine bay on this car.
What you think? I realize this turbo isn't ideal but with the .96 AR and 75 mm compressor wheel I figured it would be almost perferct for a 5.3 as a single on a stock bottom end. Looking to be about where I was with the twins, roughly 700hp to the wheels.
My car is in my signature. If I am using a stock 5.3, with head studs and LS9 gaskets, E85 and meth injection, no intercooler should the PT74 run as good as the twins? 15-20psi of boost. Also, would it do better with the XER273 cam I was using or better with the stock cam? Talking strip performance in both the 1/8th and 1/4. My twins went 118mph in the 1/8th and 140mph in the 1/4 but ran out of gear. This was at 20psi in a nearly 4,000lb chevelle.
Part of this straight up swap is me getting rid of my Vic jr intake and elbow for the Edelbrock Pro Flo XT in black powder coat. Don't necessarily think it is better but do think it is close enough and would look wicked in my engine bay on this car.
What you think? I realize this turbo isn't ideal but with the .96 AR and 75 mm compressor wheel I figured it would be almost perferct for a 5.3 as a single on a stock bottom end. Looking to be about where I was with the twins, roughly 700hp to the wheels.
XER lobes in a boosted set-up? Gives me nightmares...
I can get you two S362's for 949 a piece.
09-04-2012, 03:29 PM
#107
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now THIS is a turbo thread! thank you all for giving great insight and experience for alot of us less experienced newbies such as myself 
this along with many others hard work and help have helped me SLOWly.... ug so painfully slowly lol... put together my own custom rear mounted turbo system. the heart of it is a On3 T76 and my trust 5.7L lol hopfully when i get to texas, ill get to finish this damn car on a happy note, i finally got my 60lbs injectors and Racetronix fuel pump for it. SO CLOSE I CAN TASTE IT!!
All seriousness thanks guys for all you do, members, sponsors, and everyone else inbetween that put stuff out like this. it reallt helps. and cuts down on alot of random questions... like mine
and damn it martin if you tell me about your 226 cam again.... im gonna have to buy it lol seriously! your dangling a snicker bar in front of a fat kid here!
this along with many others hard work and help have helped me SLOWly.... ug so painfully slowly lol... put together my own custom rear mounted turbo system. the heart of it is a On3 T76 and my trust 5.7L lol hopfully when i get to texas, ill get to finish this damn car
on a happy note, i finally got my 60lbs injectors and Racetronix fuel pump for it. SO CLOSE I CAN TASTE IT!! All seriousness thanks guys for all you do, members, sponsors, and everyone else inbetween that put stuff out like this. it reallt helps. and cuts down on alot of random questions... like mine
and damn it martin if you tell me about your 226 cam again.... im gonna have to buy it lol seriously! your dangling a snicker bar in front of a fat kid here!
10-06-2012, 09:01 AM
#108
What are your thoughts on this combo....
LS1 block, bored out enough to stuff forged pistons/rods in and keep the stock crank
LS6 243 heads- already on car
Speed Inc. TU? cam
LS6 intake w/ stock TB- already on car
DIY twin turbo kit- truck manis, stainless hot side, aluminum cold side
2x Precision PT6466 CEA TO4SP T4 tangential turbocharger, 0.96 A/R http://www.precisionturbo.net/Street...-CEA%C2%AE/494
A2A FMIC
4L80e
Supporting fuel mods
-Are those turbos too large and geared towards max HP and not spool response?
-Will the 243 heads be too high of compression even with a thicker gasket? They were milled flat and I'm running a Cometic 0.040" gasket now
The goal is a somewhat "budget" minded (stock block/crank, Ls6 intake, 243 heads I already have), street setup geared towards a "fun" street car with usable a power band. In other words, I wouldn't be looking for a max HP race setup. But I would want to "build it once, build it right".
LS1 block, bored out enough to stuff forged pistons/rods in and keep the stock crank
LS6 243 heads- already on car
Speed Inc. TU? cam
LS6 intake w/ stock TB- already on car
DIY twin turbo kit- truck manis, stainless hot side, aluminum cold side
2x Precision PT6466 CEA TO4SP T4 tangential turbocharger, 0.96 A/R http://www.precisionturbo.net/Street...-CEA%C2%AE/494
A2A FMIC
4L80e
Supporting fuel mods
-Are those turbos too large and geared towards max HP and not spool response?
-Will the 243 heads be too high of compression even with a thicker gasket? They were milled flat and I'm running a Cometic 0.040" gasket now
The goal is a somewhat "budget" minded (stock block/crank, Ls6 intake, 243 heads I already have), street setup geared towards a "fun" street car with usable a power band. In other words, I wouldn't be looking for a max HP race setup. But I would want to "build it once, build it right".
10-06-2012, 09:18 AM
#109
Me personally I would go with a similar size Borg Warner turbo and save a bunch of cash that you can put into something else. Those turbos are pricey! You could go with a S360, S362, S364 or S366 and probably get both turbos for the price of one of those!
10-06-2012, 01:53 PM
#110
Here is my car last weekend. This is a 378 cid LS with twin Turbonetics 6165's on E85 at 14 psi. These are. 68 a/r housings. We stopped here because we started spinning the tires on the Dyno on this run. This is with 317 heads ported. Like the OP mentioned small twins can make big power.
http://youtu.be/P5PrDH5x9fw
http://youtu.be/P5PrDH5x9fw
Last edited by 2000RATA; 10-06-2012 at 02:20 PM.
10-06-2012, 08:25 PM
#113
What are your thoughts on this combo....
LS1 block, bored out enough to stuff forged pistons/rods in and keep the stock crank
LS6 243 heads- already on car
Speed Inc. TU? cam
LS6 intake w/ stock TB- already on car
DIY twin turbo kit- truck manis, stainless hot side, aluminum cold side
2x Precision PT6466 CEA TO4SP T4 tangential turbocharger, 0.96 A/R http://www.precisionturbo.net/Street...-CEA%C2%AE/494
A2A FMIC
4L80e
Supporting fuel mods
-Are those turbos too large and geared towards max HP and not spool response?
-Will the 243 heads be too high of compression even with a thicker gasket? They were milled flat and I'm running a Cometic 0.040" gasket now
The goal is a somewhat "budget" minded (stock block/crank, Ls6 intake, 243 heads I already have), street setup geared towards a "fun" street car with usable a power band. In other words, I wouldn't be looking for a max HP race setup. But I would want to "build it once, build it right".
LS1 block, bored out enough to stuff forged pistons/rods in and keep the stock crank
LS6 243 heads- already on car
Speed Inc. TU? cam
LS6 intake w/ stock TB- already on car
DIY twin turbo kit- truck manis, stainless hot side, aluminum cold side
2x Precision PT6466 CEA TO4SP T4 tangential turbocharger, 0.96 A/R http://www.precisionturbo.net/Street...-CEA%C2%AE/494
A2A FMIC
4L80e
Supporting fuel mods
-Are those turbos too large and geared towards max HP and not spool response?
-Will the 243 heads be too high of compression even with a thicker gasket? They were milled flat and I'm running a Cometic 0.040" gasket now
The goal is a somewhat "budget" minded (stock block/crank, Ls6 intake, 243 heads I already have), street setup geared towards a "fun" street car with usable a power band. In other words, I wouldn't be looking for a max HP race setup. But I would want to "build it once, build it right".
Also you can't base "will my compression be too high" off static compression alone. It's the dynamic compression once the cam is chosen and installed that makes the combination.
10-09-2012, 09:57 AM
#119
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Some of the custom BW stuff is not all it's cracked up to be. BW is the chosen turbo for 99% of the guys over at CumminsForum (think diesel LS1tech). Most of them gawk at the prices of anything ball bearing and I've only seen a handful of builds using Garret turbos. What I'm getting at is there are a LOT of BW's in use over there and a diesel is much harder on a turbo than our street cars. They run 40-100+psi with 1600°+ max EGT and expect them to last 100k+ miles.
There have been a lot of failures lately with some of the "Custom" BW turbos individual shops are offering. If you jump on the BW wagon get a box stock BW charger, not one that johnny joe has "Tricked out." I'm not saying they are all bad, just do your homework.
There have been a lot of failures lately with some of the "Custom" BW turbos individual shops are offering. If you jump on the BW wagon get a box stock BW charger, not one that johnny joe has "Tricked out." I'm not saying they are all bad, just do your homework.