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(Post Link) post #1 of 10 Old 21-01-18 Thread Starter
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How to make hybrid?

Hello everybody, I'm considering upgrading my turbo as my current one has developed a serious screeching noise yesterday, tried to clean the turbo today with alkali solution but still very bad screech when it starts boosting (vanes) then noise stops around 3000 RPM. Now the car is not making much power and the turbo is using oil...so I need go know some answers to my questions....

Can I fit a bigger CHRA? To make a hybrid or is machining required?

If not, can any gt1749 CHRA fit?

It is a Bravo 1.9 MJET 150
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have a read here for diy stuff
https://www.fiatforum.com/stilo/3031...d-turbo-2.html
i wouldnt suggest it unless you are a machinist or access to lathes for free, the machining cost and final balancing cost would negate getting a ready made hybrid, plus my balancer agreed to balance it but would give no final warranty as he didnt build it .
get the wrong size wheels or mismatch anywhere and you could end up with the odd annoying noises , i have off boost surge noises and whines ,rather annoying when crawling slow speed , on boost its quite though.
bought hybrids or better gtb turbos look here jsjtd here .
Turbo's
also i think autolusso will do a hybrid turbo and remap combo, (looks good deal to me inc fitting and vat.)
Autolusso - Hybrid Turbo

https://www.alfaowner.com/Forum/alfa-...andamp-gt.html

depends what you want fit and forget or all the tinkering afterwards.

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(Post Link) post #3 of 10 Old 21-01-18 Thread Starter
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Thanks for sharing sussexa, Luckily I work in an engineering company, we have mills, lathes, CNC turning machines basically millions of pounds worth if machines, and the lads are all friendly to me, if I buy an old gt1749 turbo, any guess what CHRA to buy to make this into a hybrid?

Thanks

Here is the noise in 2nd and 3rd it only happens on boost and is very quiet off boost, I find it is related to the vanes but maybe I am wrong and I also cleaned the turbo yesterday

https://ufile.io/b5737

Last edited by Walshy155; 21-01-18 at 14:46.
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im trying to steer you off the diy route, been there done that and all, if your getting one built go with what works.
trouble is specs are hard to find as they dont want you stealing there development work, understandable.
from what i remember the autolusso hybrid and jsjtd may be the same one from same company ? like i said fitted and mapped not a bad price, you build something else and the mapping will most likely be a long affair to get perfect if ever.
if you do want to diy id say at least a 52mm compressor wheel, extended tip could get larger 54mm maybe if not looking for high rev high flow go for a smaller trim ie inducer , surge less low revs. or go far a small trim 56mm compressor.
the machining is doable for you , as it was for me , i measured and made my own tools and got a local machinist to do the bores as a large lathe is required , no hobby stuff.
the build and balancing is the important bit and as stated the warranty is what your buying.
make sure its large pad thrust bearing, advise its staggered gap turbine seal if optional, buying parts and wheels could be a minefield , again you build it and wheel blows 1000 miles in come back i dont think so.
contact jsjtd on here he will steer you better than i could.
ps are you mrgreg on fiat forum message today?
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What you want to do, is what every turbo rebuilder hates.

You want to made a hybrid by yourself and another one should balance that **** and adjust the VNT (hard words, but true)? I would not do that as a turbo rebuilder. The machines for this steps are realy expensive and nobody put a turbo from a unknown source in this machines.

You like more power for peanuts and that's the wrong way!
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(Post Link) post #6 of 10 Old 21-01-18 Thread Starter
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I'm not trying to get power for peanuts, but why pay alot of money for something I don't have too, this mentality can be applied to many approaches.

Then can any gt1749 CHRA fit so I can just repair my current turbo?

Last edited by Walshy155; 21-01-18 at 20:12.
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Of course, you can repair your turbo with a new CHRA. But whats with the VNT? They don't work very well without adjustment.

The best way is to open your old turbo and see whats happens. If your turbine housing has heat cracks, you need more than a new CHRA.
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(Post Link) post #8 of 10 Old 22-01-18 Thread Starter
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I think it will be best to buy a recon turbo then
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Not really. The repair of my GT1749V (55214063) with new VNT ring and CHRA has cost 380 EUR (excl. VAT).

VNT ring: 90 EUR
CHRA: 210 EUR
VNT adjustment: 30 EUR
turbine & compressor house cleaning (sandblasting): 5 EUR
working hours: 30 EUR
screws: 2,00 EUR
shipping: 12,00 EUR

And this was made by a really good rebuilder (Home - Z-TURBO).
The most cheap rebuild turbos on ebay are not good remanufactured.
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(Post Link) post #10 of 10 Old 22-01-18 Thread Starter
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Quote:
Originally Posted by crossshot View Post
Not really. The repair of my GT1749V (55214063) with new VNT ring and CHRA has cost 380 EUR (excl. VAT).

VNT ring: 90 EUR
CHRA: 210 EUR
VNT adjustment: 30 EUR
turbine & compressor house cleaning (sandblasting): 5 EUR
working hours: 30 EUR
screws: 2,00 EUR
shipping: 12,00 EUR

And this was made by a really good rebuilder (Home - Z-TURBO).
The most cheap rebuild turbos on ebay are not good remanufactured.
Thanks for letting me know I'll look around for turbo rebuilders

Any guess what the noise on my turbo is?
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