Re: Fair price for TD04-18 turbocharger - Saab 9000 Bulletin Board - Saabnet.com


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Re: Fair price for TD04-18 turbocharger

Posted by thetallguy [Email] (#1698) [Profile/Gallery] (more from thetallguy) on Thu, 20 Sep 2018 20:28:58 Share Post by Email
In Reply to: Re: Fair price for TD04-18 turbocharger, Ned, Tue, 18 Sep 2018 13:53:48
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Saab performance goals VS money spent. In looking over the different comments, I perceive the question but the answers do not appear to cover all of the costs. If it is an Aero/Anniversary model then you will have the Mitsubishi turbo which has the larger (more better) #6 exhaust housing. If this is the case, going to an 18T or 19T wheel on the cold side of the turbo could be a cost effective upgrade. Larger wheels require the cold side alloy housing to be machined out to precisely match the larger 18T wheel. If you are rebuilding your turbo "stock" this is a cost that can be avoided. It is also less stressful in a DIY rebuild of an existing unit with the original 15T wheel and original turbine. You could go larger than 19 but that generally presents some issues with balance and flow which adds costs to the project which might possibly include, as I understand it, a "clipped" wheel and the installation of a "pipe" into the alloy housing because the machining for a 22 removes so much material. I have seen prices for just the machining of the housing for 18 or 19T between $80 and $100 dollars. Naturally there is the cost of the 18, 19, etc wheel-that cost depends upon the size and "cast" VS "billet".The 19T use to be regarded as the largest go to size. Going beyond a 19T risks durability because of shaft size VS the amount of air you are pushing. Some would argue this point about pushing to a 19T. Balance also becomes more critical. If you have a cost of $350 for a full 18T turbo rebuild, I am assuming they are using your core, that could be a very fair price: That would/should include the cost of the new wheel, the machining of the housing (preferred over replacement-my opinion), the cleaning of the turbine and turbine housing, and the replacement of the bearings, the shaft's oil seals, and the balance of the unit. They might also check the waste gate function plus repaint it. That is about what I paid to have my original turbo rebuilt (no upgrade to larger wheel) years ago. A Pro rebuild gives the best performance most peace of mind. Mine returned looking like new.

Since cost is the subject I will expand slightly on some other expenses you will encounter which others have touched upon. Going to an 18T or 19T wheel on the turbo effectively increases the amount of air moved for a given pressure within the existing software parameters...if you are using "stock" software and hardware then you will achieve slightly elevated stock power. This fact is why many Saabnet posters are requesting a performance "goal". If the turbocharger requires a rebuild and more performance is desired then going to an 18T or 19T makes perfect sense if the additional hardware and software/tune will be purchased at some future date in say one to three years. However, if you are not looking for the associated costs of a larger exhaust system, larger injectors, tune, and intercooler then getting an 18T nets you almost nothing except more lag.

Conversely, one can buy a rebuild "kit" for around $75 to $120 dollars plus a machined housing for about $100 plus the wheel (cost depends on what you get) and do the re-build yourself. There are kits which allow this to be accomplished on turbos that do not have any damaged parts or bent shafts. This is a somewhat risky proposition and requires a good deal of knowledge to set the turbo up correctly so that balance is maintained within a reasonable window. The oil shaft seals can be a bitch! I have successfully rebuilt my 9000 Aero turbo (no upgraded wheel) using a kit. That turbo has covered 150K miles. Based upon that success I would submit that it is possible. If anyone is interested in the low cost, not as safe as a professional approach, but possibly more satisfying to the ego and pocketbook, I can expand on that subject. After all, our cars are getting old. I am guilty of taking a shortcut or twelve to reduce costs.



->Posting last edited on Fri, 21 Sep 2018 06:13:56.
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