S476, what size turbine for my 5.3?
#21
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Thread Starter
Stock bottom end street car. 6900 is slightly north of where I plan to rev, even with the 92mm. Although, after seeing that someone recently broke into the 4s on a stock bottom L33 with rod bolts, I might pick up some rod bolts and try my luck up around 7000 (I also have an L33).
#23
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Thread Starter
I just don't want to have to rev to 4500 on the street to make decent boost. If I can have at least 12 PSI on the street by 4200 RPM that would be perfect.
At the track I'll have to rev to 6400 on a 28" slick and a 3.54 rear to hit 150 mph in the 1/4th. On my 275 radials (26.66" tall) it'll take me 6700 to hit the same 150. So that RPM/Gearing is ideal for me.
At the track I'll have to rev to 6400 on a 28" slick and a 3.54 rear to hit 150 mph in the 1/4th. On my 275 radials (26.66" tall) it'll take me 6700 to hit the same 150. So that RPM/Gearing is ideal for me.
#24
8 Second Club
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Stock bottom end street car. 6900 is slightly north of where I plan to rev, even with the 92mm. Although, after seeing that someone recently broke into the 4s on a stock bottom L33 with rod bolts, I might pick up some rod bolts and try my luck up around 7000 (I also have an L33).
#25
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Is anyone running 8's at 3-3300lbson a cast 75mm unit? IMO you can't group a billet s47x wheel with the cast S47x wheels. Billet hubs are machined smaller so the blades themselves are usually much longer on a billet wheel. So a cast 80mm wheel may have the same blade length as a billet "76" mm wheel. The billet stuff is also usually deeper and a slightly different profile.
#26
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Thread Starter
And if I come across a rediculous amount of money, I'll probably switch to a built glide with a gear vendors overdrive unit, or maybe back to a TH400 with a lower gear.
#27
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A TH400 with a 2.20 low gear would be interesting. Not cheap though.
So, sounds like you get to choose the ext turbine your own bad self as it seems there are a few opinions on what to use. Although the 92 sounds promising.
Although I'm ready to try mine with the slicks etc, nothing but rain here for the next ten days. I've seen our early season rained out clean through May before.......it sucks.
So, sounds like you get to choose the ext turbine your own bad self as it seems there are a few opinions on what to use. Although the 92 sounds promising.
Although I'm ready to try mine with the slicks etc, nothing but rain here for the next ten days. I've seen our early season rained out clean through May before.......it sucks.
#28
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Thread Starter
I'm still stuck between the 87 and 92, although it looks like I can get the spool I want with the 92 so I'll probably go that direction. It will also get me the extra kick I need with the 4L80e and multi-leafs in the rear.
#29
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Thread Starter
I know I'm bringing this back from the dead, but things change.
The car is no longer being built to be competitive in X235. I'm going to buy a roller later on down the road and convert it to drag-only duty. For now, this car is primarily street duty.
So I was wondering, would it still be possible to crack an 8 second quarter mile pass with an S476R and a 83mm/1.10 T6 turbine. Cam is still going to be the 218/218 on a 5.3 L33. I just want it to be primarily a street car. Going to try to keep weight around 3300 lbs, and the 92mm wheel isn't needed for the extra power. I know I'll be giving up a bit on the top end, but I should gain that much back in spool with the 83mm wheel, and I'll still be going with a divided T6 housing.
The car is no longer being built to be competitive in X235. I'm going to buy a roller later on down the road and convert it to drag-only duty. For now, this car is primarily street duty.
So I was wondering, would it still be possible to crack an 8 second quarter mile pass with an S476R and a 83mm/1.10 T6 turbine. Cam is still going to be the 218/218 on a 5.3 L33. I just want it to be primarily a street car. Going to try to keep weight around 3300 lbs, and the 92mm wheel isn't needed for the extra power. I know I'll be giving up a bit on the top end, but I should gain that much back in spool with the 83mm wheel, and I'll still be going with a divided T6 housing.
#30
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Yes I ran 8.9@158mph with my car at 3350 lbs with a box stock cast S475/83/T4 in hot summer DA on a botched run. I really think I could go mid 8's with that turbo on a good pass. This is on a lq4, I belive a 5.3L would be more efficient with that turbo and could run a little better. Im however running a Glide which is much more efficient than a 4L80E.
#31
8 Second Club
iTrader: (3)
I know I'm bringing this back from the dead, but things change.
The car is no longer being built to be competitive in X235. I'm going to buy a roller later on down the road and convert it to drag-only duty. For now, this car is primarily street duty.
So I was wondering, would it still be possible to crack an 8 second quarter mile pass with an S476R and a 83mm/1.10 T6 turbine. Cam is still going to be the 218/218 on a 5.3 L33. I just want it to be primarily a street car. Going to try to keep weight around 3300 lbs, and the 92mm wheel isn't needed for the extra power. I know I'll be giving up a bit on the top end, but I should gain that much back in spool with the 83mm wheel, and I'll still be going with a divided T6 housing.
The car is no longer being built to be competitive in X235. I'm going to buy a roller later on down the road and convert it to drag-only duty. For now, this car is primarily street duty.
So I was wondering, would it still be possible to crack an 8 second quarter mile pass with an S476R and a 83mm/1.10 T6 turbine. Cam is still going to be the 218/218 on a 5.3 L33. I just want it to be primarily a street car. Going to try to keep weight around 3300 lbs, and the 92mm wheel isn't needed for the extra power. I know I'll be giving up a bit on the top end, but I should gain that much back in spool with the 83mm wheel, and I'll still be going with a divided T6 housing.
Have yiu ever spun a fan using an air hose? Try it. Aim the hose at the tip of the fan and note how fast it spins up, then try aim it close to the hub and note the difference. .........
#32
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What makes you beleive the 83 will spool faster than the 92? You do realize that the larger 92 has extra leverage over the compressor wheel compared to the 83.
Have yiu ever spun a fan using an air hose? Try it. Aim the hose at the tip of the fan and note how fast it spins up, then try aim it close to the hub and note the difference. .........
Have yiu ever spun a fan using an air hose? Try it. Aim the hose at the tip of the fan and note how fast it spins up, then try aim it close to the hub and note the difference. .........
#33
8 Second Club
iTrader: (3)
its the a/r of the housing that necks down the incoming exhaust gasses to create velocity inside the turbine, the diameter of the turbine wheel gives the gasses leverage on the shaft and compressor wheel, and also determines the overall flow of the hotside of the turbo.
smaller turbine diameter does not necessarily mean faster spool
#34
TECH Fanatic
iTrader: (11)
This is interesting b/c I too was seeking boost to come it pretty fast for a nice street-driving experience. Here's what I have:
5.3 stock w/LS6 cam
s475 t4 1.10 83mm
ls3 mani's
2.125 hot side, fully divided w/2 38mm's
th400, 10" TSI low-stall conv., 3.27 rear, 28" tires
A2A I/C
In 3rd gear, I get about:
rpms/psi
3970 = 5psi
4355 = 10psi
4539 = 11psi (wastegate spring)
4825 = 12psi
The boost gauge zero's out at about 3400 rpm in all gears.
Looks like my boost comes it slower than most folk's combo's here. I do run a lot of timing, AFR is 11.5. For the extra 250.00 for the t4 housing, extra w/g and the trouble of going with a divided hotside, I would of expected the spool to be about 1000 rpms quicker. Should of just went with the 650.00 s475 and been done.
But, it does feel very responsive driving around. Need to stop looking at the tach/boost gauge and just enjoy the drive !!!!!
5.3 stock w/LS6 cam
s475 t4 1.10 83mm
ls3 mani's
2.125 hot side, fully divided w/2 38mm's
th400, 10" TSI low-stall conv., 3.27 rear, 28" tires
A2A I/C
In 3rd gear, I get about:
rpms/psi
3970 = 5psi
4355 = 10psi
4539 = 11psi (wastegate spring)
4825 = 12psi
The boost gauge zero's out at about 3400 rpm in all gears.
Looks like my boost comes it slower than most folk's combo's here. I do run a lot of timing, AFR is 11.5. For the extra 250.00 for the t4 housing, extra w/g and the trouble of going with a divided hotside, I would of expected the spool to be about 1000 rpms quicker. Should of just went with the 650.00 s475 and been done.
But, it does feel very responsive driving around. Need to stop looking at the tach/boost gauge and just enjoy the drive !!!!!
#37
Restricted User
Thread Starter
I'm kinda going for budget here. A 92mm exhaust wheel would cost about the same as sticking with the 83 and getting a billet compressor.
The 92 spooling faster is a bit situational. Its heavier as causes the exhaust gases to be more spread out and less concentrated, reducing impact velocity. The reason spraying onto a larger fan causes it to spin helps is the extra leverage. You're concentrating the force on the part of the blade that is best leveraged. This isn't a real world situation.
The 92 spooling faster is a bit situational. Its heavier as causes the exhaust gases to be more spread out and less concentrated, reducing impact velocity. The reason spraying onto a larger fan causes it to spin helps is the extra leverage. You're concentrating the force on the part of the blade that is best leveraged. This isn't a real world situation.
#39
8 Second Club
iTrader: (3)
The first place on the turbine that the exhaust touches after squeezing through the housing, is the tips or the turbine wheel.
Extra leverage is your freind, but of course sizing is important. You dont want to go too big either.
#40
8 Second Club
This is interesting b/c I too was seeking boost to come it pretty fast for a nice street-driving experience. Here's what I have:
5.3 stock w/LS6 cam
s475 t4 1.10 83mm
ls3 mani's
2.125 hot side, fully divided w/2 38mm's
th400, 10" TSI low-stall conv., 3.27 rear, 28" tires
A2A I/C
In 3rd gear, I get about:
rpms/psi
3970 = 5psi
4355 = 10psi
4539 = 11psi (wastegate spring)
4825 = 12psi
The boost gauge zero's out at about 3400 rpm in all gears.
Looks like my boost comes it slower than most folk's combo's here. I do run a lot of timing, AFR is 11.5. For the extra 250.00 for the t4 housing, extra w/g and the trouble of going with a divided hotside, I would of expected the spool to be about 1000 rpms quicker. Should of just went with the 650.00 s475 and been done.
But, it does feel very responsive driving around. Need to stop looking at the tach/boost gauge and just enjoy the drive !!!!!
5.3 stock w/LS6 cam
s475 t4 1.10 83mm
ls3 mani's
2.125 hot side, fully divided w/2 38mm's
th400, 10" TSI low-stall conv., 3.27 rear, 28" tires
A2A I/C
In 3rd gear, I get about:
rpms/psi
3970 = 5psi
4355 = 10psi
4539 = 11psi (wastegate spring)
4825 = 12psi
The boost gauge zero's out at about 3400 rpm in all gears.
Looks like my boost comes it slower than most folk's combo's here. I do run a lot of timing, AFR is 11.5. For the extra 250.00 for the t4 housing, extra w/g and the trouble of going with a divided hotside, I would of expected the spool to be about 1000 rpms quicker. Should of just went with the 650.00 s475 and been done.
But, it does feel very responsive driving around. Need to stop looking at the tach/boost gauge and just enjoy the drive !!!!!