best turbo for 500-650 hp scion tc roll racing
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Scionetics
KAD
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Joined: Oct 2005
Posts: 11,936
From: Western NY
I know I don't say much around here anymore but, in my findings I have found that since Precision and Garrett have split, Precision reliability has suffered. I personally use a FP HTA2868 on my vehicle and used Garrett on my buddies builds. My good friend with a subaru STI suffered two teardowns (gaskets, gaskets, gaskets!) for warranty repair on his Precision. Both his original and replacement didn't last more than 5k. I got a sick feeling in my stomach after that because I was a fan and user of the ol' t61.
I'm not flaming on them because horror stories can be told of all turbo companies. I tend to sway to rebuilt turbos because the cartridge has gone through some heat cycling and has already shifted as opposed to new cast iron that may not have been heated yet. If you get extra funds buy an ebay turbo take it apart and see for yourself that a Precision and Ebay don't look much different. I can't say I've taken apart a Garrett for myself because I've always sent mine back for warranty or repair. I have taken various others apart, some for fun others because of fails.
So now your prolly asking yourself "why is he telling me this?" The answer is simple a turbo is a turbo is a turbo. They operate on the same principle as the other turbos before them. What is different is workmanship and materials, that is what you should buy into. Billet is lighter, faster spool, and is expensive because of workmanship and materials. Stainless steel housing also expensive again because of the workmanship and materials. China etc. bearing vs tested proven bearing will always yield results in favor of the workmanship and material.
I don't like asking around much about turbos because you will always have that one guy with doom and gloom fail experiences. Again, look for the workmanship and materials in your products. If you look for this in your turbo you will always get the best deal.....
Building a car for boost is always going to be expensive no matter how you put it.
I'm not flaming on them because horror stories can be told of all turbo companies. I tend to sway to rebuilt turbos because the cartridge has gone through some heat cycling and has already shifted as opposed to new cast iron that may not have been heated yet. If you get extra funds buy an ebay turbo take it apart and see for yourself that a Precision and Ebay don't look much different. I can't say I've taken apart a Garrett for myself because I've always sent mine back for warranty or repair. I have taken various others apart, some for fun others because of fails.
So now your prolly asking yourself "why is he telling me this?" The answer is simple a turbo is a turbo is a turbo. They operate on the same principle as the other turbos before them. What is different is workmanship and materials, that is what you should buy into. Billet is lighter, faster spool, and is expensive because of workmanship and materials. Stainless steel housing also expensive again because of the workmanship and materials. China etc. bearing vs tested proven bearing will always yield results in favor of the workmanship and material.
I don't like asking around much about turbos because you will always have that one guy with doom and gloom fail experiences. Again, look for the workmanship and materials in your products. If you look for this in your turbo you will always get the best deal.....
Building a car for boost is always going to be expensive no matter how you put it.
This the key. EMS can do boost vs vss or boost vs gear. Ive set mine up both ways and honestly had better luck using the boost vs vss and using a bit of a ramp rather than jumping from 18-24-28 psi (how my boost by gear was setup)
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Scionetics
KAD
SL Member
Joined: Oct 2005
Posts: 11,936
From: Western NY
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Joined: May 2010
Posts: 958
From: Chicago, IL
You definitely inspired me to do a high hp build! I think the turning point was when I saw the video of you chucking the duece at that bike @ Tk12! Looking forward to seeing the Tk13 clips!
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Joined: Jan 2013
Posts: 48
Thread Starter
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Joined: Jan 2013
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Havent broke a trans since I went to boost vs vss. The car has only seen a small number or street pulls at 656whp before it blew up. Tearing everything down this weekend, suspecting a melted piston due to too much timing. Originally thought it was fuel but looked back through the data logs and the afr (gas scale) never rose above 12.5:1 which should be fine on e85. On the other hand, the timing at 31 psi was never really squared away like it shouldve been and I think I had too much advance at peak torque. This time a more knowledgeable tuner than myself will be taking care of this 
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Joined: Jan 2013
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ohhh sometimes the problems with the tranny remove my hopes of building my tc .. I have almost all the parts . What we do with alot of power if we gonna break the tranny in the fisrt month this really make me sad
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Joined: May 2010
Posts: 958
From: Chicago, IL
That's why you research the successful builds on this forum and you'll find a lot of the answers you're looking for. I advise you take a look at thendawg's thread cause he's pretty much done it all....broke it....done it all again but you'll gain A LOT of knowledge about what works and what doesn't. Don't get me wrong....every car is different but you can get a good baseline from looking at what other people have done successfully.
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Joined: Jan 2013
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That's why you research the successful builds on this forum and you'll find a lot of the answers you're looking for. I advise you take a look at thendawg's thread cause he's pretty much done it all....broke it....done it all again but you'll gain A LOT of knowledge about what works and what doesn't. Don't get me wrong....every car is different but you can get a good baseline from looking at what other people have done successfully.
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Joined: May 2010
Posts: 958
From: Chicago, IL
Boost by vss has a lot to do with the concerns you have about the tranny. Bringing the boost in gradually helps transition the power better and less violent from wheel hop and tire spin than just having your boost at its highlest level all the time.
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I completely understand you and i do read alot in all build threads i do know the tranny break but not that aften . Whats the point in building your engine to hold 600-700 hp if you tranny wont be able to even hold 550 reliable it is really making me sad . Is like buying alot of shoes to someone that dont have feet he have them all but cant use them same with the tc lots of power woth build engine but you cant use it cus of the tranny lol
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Joined: May 2010
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From: Chicago, IL
If you've gone through the trouble of collecting parts....why throw all that hard work away because you "think" the tranny can't hold power when people are saying it can be done but its gonna take some effort and research. When people tell me I can't do something that just gives me ammunition to prove them wrong. Prime example....when I started collecting parts for my build an aquantence with an Evo told me I should just sell my tC and buy an Evo cause you can't make a tC fast.....when my tC is done I'm gonna stomp a mudhole in that Evo's a$$!
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I know it can be done but at what lvl the reliability is gonna be . Also ive heard about aem em4 standalone is it good just like aem ems .. Ive ask some menbers about it but will like to heard . I can get one local in a very good price but i have to make someone make me the custom wires to the car will like to heard more of it
