[adieu]

>Hi.
>
>Back late and can't sleep! So there are a few points I would
>like clarified so I have added them into the text. Don't
>anyone take it the wrong way but I hope it provides more food
>for thought, and also some more answers. :)
>
>>Here ya go the post made by Dan from TT:
>>
>>The turbo is built to handle 22psi all day. While the 19T is
>a
>>good turbo for a standard car, i would not recommend it to
>be
>>used for running high boost.
>
>Please define high boost.
>
>>Yes, they come with a 360 degree
>>thrust bearing as standard, but it really isn't up to the
>job
>>of handling much more than standard boost.
>
>Why isn't the bearing up to the job? Define standard boost, on
>which car?
>
>>There is also the
>>problem of the old comp wheel design and it's narrow working
>>range.
>
>Narrow working range? Flow charts for the 19T seem to
>contradict that.
>Also is a 19Ts compressor wheel old in the same way a Garrett
>T series turbo is old to a Garrett GT series turbo?
>
>>To be honest, it is nearly impossible to use a standard
>turbo
>>as an uprate in place of another standard turbo.
>
>??? Even if it is bigger and flows more efficiently for the
>same boost?
>
>>While the 19T
>>is the closest match you would find with regards to size
>>(although it is still quite a bit smaller), it is not built
>to
>>handle high boost pressures,
>
>None of the turbos Volvo fitted are being pushed hard in any
>way as standard, as Volvo want them to last even under
>duress.
>
>>nor is it specifically designed
>>for the job you want it to do. It would be nearly impossible
>>to put a warranty on a standard unit being run above its
>>recommended boost pressure.
>
>What IS the recommended pressure then?
>
>>We can offer a two years warranty
>>with our hybrids.
>
>Nice....
>
>>I would just like to point out, as well, that it has been
>>mentioned that a Standard unit can run up to 26psi. This is
>>true of most turbos, and if that is the case, what is the
>need
>>for hybrids?
>
>The need for hybrids comes from a set of very specific
>requirements that are not met by an off the shelf unit. Simple
>as that.
>
>>A standard unit can not run much more than
>>standard boost EFFICIENTLEY.
>
>What is a standard unit? And what is standard boost?
>
>>Tuning cars is more than just how
>>much boost you can run.
>
>Absolutely.
>
>>You need to take into consideration
>>things like heat as well. A standard turbo will get
>extremely
>>hot at 26psi, thus counteracting the compressing effect and
>>therefore reducing power and creating dangerous knock as the
>>intercooler struggles to cool the charge air back down. You
>>also encounter the problem of overspeed, due to the turbine
>>side being too small.
>
>How can the turbine on a 19T be too small? It is the same size
>as a standard 16T and if the 19T is running the same pressure
>as the standard 16T turbo it will not be going as fast to
>produce the same pressure. Likewise if the boost is raised,
>the 19T will still be flowing cooler air at 1.1 bar than a
>16T, and (personally) I had my 16T running 1.1-1.2 bar for 2
>whole years and the car went great with no problems at all and
>STILL doesn't use any oil!!
>
>>This will cause premature wear on the
>>bearings, hence the need for a larger turbine side.
>>
>>And alittle more:
>>
>>
>>The T28 would be more responsive, has a substantially larger
>>compressor wheel. In fact, to get technical, the diameter of
>a
>>Td04hl wheel is 56mm with a 43.4mm inducer, whereas the T28
>>wheel is 60mm diameter and has a 46.4mm inducer.
>
>I thought the TD04 part was the the designation for the
>TURBINE side of the Mitsu turbos? The TD05 is bigger and the
>TD06 is bigger still.
>It is the 15G, 16T etc nomenclature that is indicative of the
>compressor size. and the T or G designation is to do with the
>blades on the compressor.
>
>>Therefore the
>>T28 is 14% larger
>
>Than what? compressor wheels were being compared, but it was
>not mentioned which one the dimensions were from.
>
>>which would roughly equate to a 40bhp higher
>>maximum working range. A 15G is capable of not much more
>than
>>standard power, efficiently. The Mitsubishi compressor
>design
>>is very old
>
>Says who?
>
>>with a full blade design,
>
>What is a full blade design, and as opposed to what?
>
>>which gives a very
>>narrow operating range, and a common side-effect is the
>>inducer chokes up. The T28 uses a new half blade design.
>
>Which means what in English? Too much techno-babble.
>
>>Our hybrid also comes with a substantially larger turbine
>>side, designed by us for the Volvo, not a standard T28
>>housing. Yes, it does require a fitting kit, but this is
>>supplied. Yes, it does away with the dump valve, but this is
>>not a necessity. Dump Valves are only needed on the standard
>>Mitsubishi turbos due to there compressor design.
>
>Sorry but that is utter rubbish!!! So why has my mate with his
>soon to be 550BHP Supra been advised to make sure he has a top
>class dump valve installed? Why to prevent compressor stall
>that is why!! Compressor stall = BAD, doesn't matter who makes
>the turbo.
>
>>The narrow
>>operating range
>
>Evidence please?
>
>>can cause surge, and a dump valve is used to
>>help counter-act this problem.
>
>Surge sounds like too much boost, therefore a dump valve is to
>counter too much boost?? I don't think they are you know......
>They are there to prevent the excess boost in the inlet when
>the throttle plate closes from stalling the compressor blades
>and bringing them from XX,000 rpm to nothing in a blink of an
>eye which is NOT GOOD.
>
>If the user would like a dump
>>valve, it can be plumbed in elsewhere very easily.
>
>I would......
>
>>There ya go new I could find it.....Hope that answers your
>>questions.
>
>Actually it threw up a few more. ;)
>
>Later all,
>Dan.



Maybe Dan from TT should answer your questions as I have stated i'm no expert on Turbo's just pushing a product that I think is great at it's job. Maybe you should come to the next C/B meet and drive my car, then you can see just what it's like.

And as for not getting power gains as I've said many times my car is mapped for everyday driving and to last!

Regards

Iain