5SFTE larger turbo disscussion, lets talk turbos other than the ct-26 on the 5sfe Options

[presure2]

ok guys. we all know what the 5sfte can do, equipped with a ct-based turbo, and moderate (10-~15psi) boost (180-~235whp)(i call it moderate boost, its all a "relitive" term..lol)
we know what shannons car made, @ ~11psi (~240whp) with the "ebay special" mismatched 50 trim T3/4
but, im interested in your thoughts on somthing a bit more reliable..lol
so lets start with a few turbos that we can easily adapt to our cars. (using the generic ebay adapter, or the ATS, or whatever adapter you can get your hands on..lol)
ok so, most of the adapters out there are T3 footprint, and by looking at what the mr2 guys are doing, anything sub 300whp is pretty much owned by the GT28rs aka the disco potato.
jgreening on this forum had the very first Speedsource 'rs kit, and made great power with it, along with super fast spool and response.
just going by that, it would seem like that it would be just as good a performer on the 5s, but, i have read curcumstances of 3rd gen guys having boost creep problems with it, which for us, would be death.
its an expensive turbo, @ ~1100, but it is true ball bearing, available in both a t25 and a t3 footprint, with other housing options as well.
for 270whp and above, we can start looking, again going by what the 3s guys use, (i mean hey, why not keep it simple, and go with things that are proven to start with...lol) we could go with somthing like what the ko racing "streetbrawler" kit uses, the T3/4 46 trim, with the .63 a/r turbine.
IMO i think we could spool this turbo by ~35-3800rpm, and even at low (8-10psi) boost, still make great power, and be 300whp+ capable with proper engine management, fuel ect.
i know alot of you guys would never think of droping 2k on half a turbo kit, but, in reality, for instance, somthing like the speedsource gt-28rs kit, which NONE of us could fabricate in our home garage,(carl does AMAZING work) that would "in theory" bolt on (other than all the other turbo stuff you would normally need), kinda makes me think otherwise about it.
i mean hell, even fabricating one up, out of one of those crappy ebay adapters could be made to work, just a matter of buying the proper parts, and welding up the DP ect.
what are your guys thoughts on this stuff???

[Silver94CelicaOw...]

Manny, I personally would love to see a GT2871R enlisted for service on your 5SFTE setup. Its an awesome turbo.


Heres my reasoning. With the added displacement and C/R you have over a 3SGTE with the 5S, your engine is going to tend to spool the turbo a but lower in the RPM band than it would on the 3SGTE....The A/R of that turbo will still net you good low end spool from the motor, but will really make the midrange and high end power delivery shine.

Thats probably the biggest improvement you could make on a torquey motor like the 5SFE, to utilize the low-end exhaust flow to spool up a nice chunky turbo to make the rest of the powerband much more lively.


If I ever upgrade from the CT20B, It'll be tossed in favor of a GT2871R. It pulls really hard in the mid/high RPMs, lightyears beyond what the CT turbos could ever do.....I think KO Racing makes a kit with the GT2871R as an option, with a lower or higer trim available to suit your needs.


EDIT- I forgot to add also....my theory for using that turbo is also largely based on the ability to use a quality aftermarket wastegate instead of an internally gated unit. Using a Tial/Turbonetics/Turbosmart wastegate along with the GT2871R would keep the boost right where you wanted it and it wouldn't move unless told.

This post has been edited by Silver94CelicaOwner: Feb 8, 2008 - 5:13 PM