legendswraith Posted March 24, 2009 Share Posted March 24, 2009 Just wondering if anyone has come across a source for turbo wheels/turbines. I'm looking for a set of internals from a GT28RS the idea is the side of the wheels etc isn't too far off stock wheel sizes so with minimal machining and faffing around with bits i may be able to uprate the stock tubbies. Biggest problem i am coming across atm is all the distributors will happily sell me a CHRA but not the bits i actually want. With the wealth of experience around here someones bound to have come across something silmilar or at least be better at searching than me Cheers Austin Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 26, 2009 Share Posted March 26, 2009 You do realise that putting a CHRA together isn't a case of bolting the two wheels on and tightening up the nuts? You have to carefully balance it to about 100,000rpm and some other trivialities. Quote Link to comment Share on other sites More sharing options...
legendswraith Posted March 26, 2009 Author Share Posted March 26, 2009 Yes i am well aware Ian and its a good observation to make. I work at Rolls Royce though and have access to schenk balance machines that will be capable of doing the job though. Also i have quite alot of facilities i can "ahem" borrow so the technical side isn't much of a problem if i manage to do it it will be more on the functional side of things. Its something of a slow burn project i've been revisiting every so often in an attempt to find a cheaper way to hybridise/ refurb stock turbos as i personally think that the usual price is a touch high Quote Link to comment Share on other sites More sharing options...
bondango Posted March 26, 2009 Share Posted March 26, 2009 And, are you aware that there is a lot more to hybriding a turbo than changing the compressor/exducer wheels. theres a lot of calcs to be done concerning A/R's etc etc then There are also lots of factors such as thrust pressures, bearing pressures, Shaft loading and fatique. Quote Link to comment Share on other sites More sharing options...
legendswraith Posted March 26, 2009 Author Share Posted March 26, 2009 Airflow ratios and compressor maps were the first thing i looked at to see if there was anything that would be able to perform within the size limitations, here are some further things to consider based around the housings and the feasibility of machining/wall thicknesses etc. Shaft loading i am not too concerned about as the idea atm will not be using the original carriers etc. As for fatigue do you mean thermal fatigue or fatigue life? Bearing pressure is a good one though that i hadn't considered which is a bit of a lapse considering its importance. Just want to point out this is just a project due to my own interest and something i want to play around with which is another reason i posted to gain the benefit of others experience. At the end of the day it may not be plausible or it may go horribly wrong but it'll kill some time finding out Quote Link to comment Share on other sites More sharing options...
bondango Posted March 26, 2009 Share Posted March 26, 2009 I understand its just for your own interest, but, if spending the time and research, i would be looking at seeing if you can find a complete CHRA and compressor cover that can be made to fit the stock hotside. It dosnt have to be anything fancy, simply garrett t3 CHRA etc etc, will need custom feed/return but this could also be a very viable business opportunity. Quote Link to comment Share on other sites More sharing options...
legendswraith Posted March 26, 2009 Author Share Posted March 26, 2009 I understand that its a viable business opportunity, my initial thoughts were such. But given the level of machining etc i may possibly have to do i don't think i would have access to do it too often. Using a complete CHRA would make it easier but it defeats the point of the exercise, which is to use as much of the originals as possible and keep it as close to original as possible (minimal machining/modification etc) and still keep it pretty much plug and play. Everything is based around the availability of finding suitable wheels though and if thats going to be a problem then it will fail at the first hurdle. When i can confirm i can acquire the items i need then i'll be upto my eyeballs in calculations In the end up it may be more frustrating, expensive and awkward than its worth but it will be a learning process Quote Link to comment Share on other sites More sharing options...
bondango Posted March 26, 2009 Share Posted March 26, 2009 For bits there are a lot of things that may suit your needs i.e. td04 wheels etc etc I would check out JAWarehouse, ive had loads of bits from them, including replacement tubbies. Excellent Prices, and plently of specs on the parts they sell.... You can do a lot on paper with regards the specs to see how much machine work, material removale etc etc before actually transferring things to the real world Heres the link http://stores.ebay.co.uk/JAWarehouse Quote Link to comment Share on other sites More sharing options...
legendswraith Posted March 26, 2009 Author Share Posted March 26, 2009 Thanks for the link can't look at it yet as works computers frown on ebay. When i have turbo in bits and on the cmm i'll be able to get a good idea of the sizes etc for modification and the paperwork exercise can begin Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 26, 2009 Share Posted March 26, 2009 Yes i am well aware Ian and its a good observation to make. I work at Rolls Royce though and have access to schenk balance machines that will be capable of doing the job though. Also i have quite alot of facilities i can "ahem" borrow so the technical side isn't much of a problem if i manage to do it it will be more on the functional side of things. Hehe you understand I didn't mean to sound patronising or anything but the average punter coming along with that sort of idea has somewhat less impressive facilities to hand! Good luck with it, try not to take anyone's eye out -Ian Quote Link to comment Share on other sites More sharing options...
legendswraith Posted March 29, 2009 Author Share Posted March 29, 2009 Lol yep sure Ian in normal circumstances it would have been on the money and i would have said the same things. Have them in bits atm and there is not alot of free room to play with on the turbine side or with the rear journal, might need to rethink a few angles of attack. On the upside i just found out we do ceramic coating too Quote Link to comment Share on other sites More sharing options...
legendswraith Posted March 30, 2009 Author Share Posted March 30, 2009 Well after a bit more looking around it seems unless i can find a pair of blown gt28rs turbos i am going to have to use t03-60 compressors. Also shaft sizing is becoming problematic so this is going to end up less ambitious than i originally intended. Looks like it will be more or less a strip and rebuild but using the steel turbine rather than the ceramic and a t03 compressor. Quote Link to comment Share on other sites More sharing options...
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