gt45 80mm billet or s475?
11-18-2015, 09:40 AM
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gt45 80mm billet or s475? im building an lq4. basically stock besides cam change etc. im torn between getting a gt45 80mm billet turbo, or an s475. 80mm is 1.15ar t4. s475 is t6 1.32 ar. they are close in price so which is more beneficial?
11-19-2015, 05:33 AM
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I don't think you can beat a s475. It will make around 800 to the tire on your combo and another thing is there are SO many upgrades you can do to it without changing anything that's a win on its own. The eBay gt45 if you ever want to change turbos you might need to redo the DP then sell it and take a loss. Also born warner turbos have awesome reliability
11-19-2015, 09:41 AM
#4
Gt45 platform is a dinosaur, even with the 80mm compressor wheel. VSracing makes an 88/83 turbo now that looks really promising. Guys are making great power with it, but I've yet to see someone turn it up to 25lbs and see what it can really do.
Id like to see what one is capable of. Buy it and let us know!
http://www.vsracing.net/catalog/prod...3bcca6adfa10a3
Id like to see what one is capable of. Buy it and let us know!
http://www.vsracing.net/catalog/prod...3bcca6adfa10a3
11-19-2015, 10:05 AM
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Yeah I'm not to sure what I wanna get yet. The s475 is only 60 bucks more and I know the reliability is definitely there. I might go 17-18lbs just to race. I'm not gonna go to crazy on boost.
11-19-2015, 10:46 AM
#6
Problem is the cheap $650 S475 has a T6 1.32 housing, which will be slower to spool. If you want a T4 the price jumps way up. It’s an additional $200 for the T4 plus shipping. The T6 1.32 is heavier and physically much larger than the T4 china stuff. Both on the compressor and exhaust side. BW units are physically huge! But still a great turbo.
The china turbo “should” spool more quickly and be much easier to package. If you’re only running 17-18lbs I’d try the VS 88/83 or even the 77/83. Either should easily support 17-18lbs on a typical LS build. The 77 will spool more quickly and should still be pleanty of compressor for your needs.
The VS 77/83 is $485 shipped. Compare that to a $850 T4 S475 (plus shipping) and it’s a pretty big difference.
http://www.vsracing.net/catalog/prod...oducts_id=1358
The china turbo “should” spool more quickly and be much easier to package. If you’re only running 17-18lbs I’d try the VS 88/83 or even the 77/83. Either should easily support 17-18lbs on a typical LS build. The 77 will spool more quickly and should still be pleanty of compressor for your needs.
The VS 77/83 is $485 shipped. Compare that to a $850 T4 S475 (plus shipping) and it’s a pretty big difference.
http://www.vsracing.net/catalog/prod...oducts_id=1358
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12-07-2015, 04:34 PM
#11
I have a s475 t6 1.32 on my lm7 5.3. I wont say its lazy at all. I have 1 5/8 headers with 2.25 up pipes {from the headers to the turbo}. Even with my tight convertor it spooled pretty quick. With the loose convertor it lights off instantly.
What I personally like about the s475 is the quality but also the upgrade ability. If say you want a little more you can do drop in billet wheels and race covers to raise the HP capability of the turbo. Or you can send to a few different places for their billet wheels and race covers like boost lab or forcedinduction. Say later you want a lot more or have decided to do more to the motor or whatever the case. Forcedinduction will turn it into a billet wheel with race cover 476r,80,82 or 88 for $699.00. I bought my 475 new used for $575.00 but have seen them cheaper. Sure if you add 649 to 699 then you spending $1350 for a billet race wheel turbo but your not doing that all at once. Just like when you build or build up your car. Most people do it in stages for $$$ reasons.
Some say the billet wheels don't work why others claim different. I have talked to quite few turbo company's over the past 2 years I have had my 475 about upgrades. They all have different things to say about billet wheels but non of them have said they don't work. Some like 6 blades, some 7 blades and some 11 blades. Even the ones that don't sell them for this turbo still recommend them.
This article came out saying they don't work but did not show any back to back dynos.
http://www.enginebasics.com/Advanced...%20Wheels.html
this link the guy didn't get a big peak but a lot under the curve
http://www.theturboforums.com/thread...-turbo-results
In the end you have to make your own decision. I have nothing to say bad about the vsracing turbos. I have seen people do very well with them.
What I personally like about the s475 is the quality but also the upgrade ability. If say you want a little more you can do drop in billet wheels and race covers to raise the HP capability of the turbo. Or you can send to a few different places for their billet wheels and race covers like boost lab or forcedinduction. Say later you want a lot more or have decided to do more to the motor or whatever the case. Forcedinduction will turn it into a billet wheel with race cover 476r,80,82 or 88 for $699.00. I bought my 475 new used for $575.00 but have seen them cheaper. Sure if you add 649 to 699 then you spending $1350 for a billet race wheel turbo but your not doing that all at once. Just like when you build or build up your car. Most people do it in stages for $$$ reasons.
Some say the billet wheels don't work why others claim different. I have talked to quite few turbo company's over the past 2 years I have had my 475 about upgrades. They all have different things to say about billet wheels but non of them have said they don't work. Some like 6 blades, some 7 blades and some 11 blades. Even the ones that don't sell them for this turbo still recommend them.
This article came out saying they don't work but did not show any back to back dynos.
http://www.enginebasics.com/Advanced...%20Wheels.html
this link the guy didn't get a big peak but a lot under the curve
http://www.theturboforums.com/thread...-turbo-results
In the end you have to make your own decision. I have nothing to say bad about the vsracing turbos. I have seen people do very well with them.
Last edited by Clean94Z; 12-07-2015 at 04:51 PM.
12-07-2015, 07:36 PM
#12
Some say the billet wheels don't work why others claim different. I have talked to quite few turbo company's over the past 2 years I have had my 475 about upgrades. They all have different things to say about billet wheels but non of them have said they don't work. Some like 6 blades, some 7 blades and some 11 blades. Even the ones that don't sell them for this turbo still recommend them.
The "billet" upgrades usually use smaller hubs and longer blades. This allows them to flow more air. Its easier for a small business to CNC billet wheels than make molds and mass produce cast wheels. So billet is the norm for aftermarket upgrades.
The china turbos usually use outdated cast wheel molds. So they don't flow as well as the "new" wheel moldings with extended tips and suck you get when running "brand name" turbos.
Both these wheels have a 60mm OD. You can see the billet wheel has a longer overall blade length and extended tips.
12-08-2015, 07:07 AM
#13
I don't know that I have seen any stock "casting" billet wheels for the 475. Seems like most have something different. But I see your point!
Saying "billet" wheel is kinda like saying stock bottom end {regapped rings or rods bolts}. Many different versions of them just made from billet. Which is where someone looking at one would need to do some research to see what is best for them.
Personally I would love to see back to back dyno's or track passes. Your setup gained quite a bit going from the 475 to the billet 476.
12-08-2015, 08:44 AM
#14
Yes, if you’re looking strictly at small performance turbo shops they will all make changes to the design and of course they will flow better. My point is they don’t perform better because of the material they are made from. Billet wheels only flow more than their cast counterpart if the design is somehow improved.
If you look in the diesel truck/turbo world you’d see OEM billet wheels are common. Holset mass produces many of their diesel line with billet wheels that are an exact copy of the cast wheels. Tests have been performed on the Holsets showing the lighter cast wheels slightly outperform the billet wheels. As I said billet wheels were originally used for added strength/longevity in big rigs. After 500+ k miles at steady 30psi the cast wheel hubs would literally pull apart. In the racing world the wheels aren’t subjected to those kinds of sustained loads, so we never see that type of failure. If the casting process overhead didn’t cost so much, we would see more aftermarket cast wheels.
If you look in the diesel truck/turbo world you’d see OEM billet wheels are common. Holset mass produces many of their diesel line with billet wheels that are an exact copy of the cast wheels. Tests have been performed on the Holsets showing the lighter cast wheels slightly outperform the billet wheels. As I said billet wheels were originally used for added strength/longevity in big rigs. After 500+ k miles at steady 30psi the cast wheel hubs would literally pull apart. In the racing world the wheels aren’t subjected to those kinds of sustained loads, so we never see that type of failure. If the casting process overhead didn’t cost so much, we would see more aftermarket cast wheels.
12-08-2015, 08:56 AM
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trying to decide between the VS 88/83, on3 88, and the on3 78/75. They all seem to be able to make 650-750 on the right application, would you agree forcefed? I am open to trying to 78, it's cheaper slightly and might spool a bit faster. It'll be on a 5.3 with pac springs and a LS2 cam. (had it laying around haha)
12-08-2015, 09:24 AM
#16
yes, if you’re looking strictly at small performance turbo shops they will all make changes to the design and of course they will flow better. My point is they don’t perform better because of the material they are made from. Billet wheels only flow more than their cast counterpart if the design is somehow improved.
If you look in the diesel truck/turbo world you’d see oem billet wheels are common. Holset mass produces many of their diesel line with billet wheels that are an exact copy of the cast wheels. Tests have been performed on the holsets showing the lighter cast wheels slightly outperform the billet wheels. As i said billet wheels were originally used for added strength/longevity in big rigs. After 500+ k miles at steady 30psi the cast wheel hubs would literally pull apart. In the racing world the wheels aren’t subjected to those kinds of sustained loads, so we never see that type of failure. If the casting process overhead didn’t cost so much, we would see more aftermarket cast wheels.
If you look in the diesel truck/turbo world you’d see oem billet wheels are common. Holset mass produces many of their diesel line with billet wheels that are an exact copy of the cast wheels. Tests have been performed on the holsets showing the lighter cast wheels slightly outperform the billet wheels. As i said billet wheels were originally used for added strength/longevity in big rigs. After 500+ k miles at steady 30psi the cast wheel hubs would literally pull apart. In the racing world the wheels aren’t subjected to those kinds of sustained loads, so we never see that type of failure. If the casting process overhead didn’t cost so much, we would see more aftermarket cast wheels.
12-08-2015, 09:40 AM
#17
trying to decide between the VS 88/83, on3 88, and the on3 78/75. They all seem to be able to make 650-750 on the right application, would you agree forcefed? I am open to trying to 78, it's cheaper slightly and might spool a bit faster. It'll be on a 5.3 with pac springs and a LS2 cam. (had it laying around haha)
