Hiya, I have been offered one of these, Im very keen however just need to clear a few things up -

I was told I need an Oil restrictor for definate,

Also that I 'may' need a few other bits, Can anyone advise on whats needed to get it onto the 20vt, I am assuming it should require minimal parts??

Oh, lastly are they good for more power than say stage 1 Hybrid? Being roller bearing??

Chrissy

Chrissy, this requires amendment to the downpipe (v-band adaptor), and requires other parts also.

It depends on price, but its a big step up from a hybrid.

GT28R's can make between 300-350bhp, so it just depends on what your setup is. Otherwise you can run low boost and still make reasonably good power.

Is it what your probably looking for? No.

Ross

To clarify, it's mine, is a T28R not a GT28R, already has the V-band elbow (plus clamp, if needed) has previously been fitted to a 20VT manifold, etc. etc.

No offense taken, just adding details.

Sorry - Thought it was a GT28R with a typo!!

Whats the difference then? What size wheels on it? Housing size etc?

Ross

That I can't say beyond the exhaust housing being marked as an A/R of .42, which would be quick to spool. A T28R is a T28 with roller bearings, not thrust/journal bearings, so ideal for a decatted system.

I couldn't even venture a guess as to its origins, as there is no id. plate nor other part no., and it arrived as a joblot of spares in a box, along with my 2nd Coupe 20VT. Does anyone know if a William Oscroft was on here, as it was all his stuff, since he didn't have the time to devote to getting it roadworthy again.

Punto, can you confirm its a .42 exhaust side for sure (just nissan uses a .48 t28 from memory), I don't know the T28's well as the 16v's never had them, but if I recall the .48a/r T25/28 is one of a pair off the Nissan GTR RB26, so effectively for a 1.3l

If it is a .42a/r exhaust side, thats very small for a 2l, there plently of talk on here about the "GT28 .64ar vs.86ar". I would think it would restrict the exhaust side too much,

I'll check on the home PC

If you dont know what it is how do you know it has roller bearings? OR if it is actually is a "T28R" 0.42 does not sound right.

That's a definite yes on the .42 A/R cast into the exhaust housing.



Obviously I can't be 100% sure, with no id. plate or other part no.s, that it's a T28R, but I do know the difference in 'feel' between a 'dry' journal bearing turbo and a roller bearing one, as I've a T25R off a Nissan 180/200SX, and an IHI RHB5 VL7 too. I'll put pictures up the moment that I get a chance, then you can all muse a bit more.

Right, well I would not be putting a restrictor in it unless you are 100% sure.

I've never heard of a "T28R" - I love it how poeple make up turbo names. Nissan ball bearing turbos are based on the GT series.

Actually the T28R is from the Silvia S15, It does exist -
Also on doing research they dont need a restrictor, I will speak to Garrett or a sepcialist and see whats what, Punto16vt if you could PM ME some pics when you get 5, cheers!

So, when about to take the pictures I discovered the id. plate hidden by one of the loosely attached oil hoses. It's basically a TB2810 (i.e. the std. 20VT OEM turbo) whether or not it has been modified I could not say. Pic.s here:








A thread from Guy Croft about the TB2810 and suitable alternative upgrades:
http://www.guy-croft.com/viewtopic.php?p=9722

Have you read this?

Sure they exist but they are infact a GT28R (the original GT28R)

Which is why I got confused, as I presumed this was the one you meant. The exhaust housing from the original one, needs rotated to make fit to the coupe. However, if it came off a coupe, it should already have been done.

Ross

0.42a/r is the housing size of the compressor housing on a standard turbo, are you sure you are not confusing this with the turbine housing, never heard of a 0.42a/r turbine housing

Actually, you're correct I did mistakenly refer to the exhaust when it was the compressor housing with .42 cast outside and stamped inside the throat. My error (need sleep, it's been a mad few days is my only excuse).

I feel reasonably sure this is more tapered out than standard, which may account for the 'feel' of a roller bearing CHRA that I noticed, can anyone confirm whether or not there are 'standard' or 'group buy' TB2810 upgrades like that?

i would be very surprised if anyone has ever made a ball bearing standard turbo, it just wouldn't be worth it, the CHRA itself would be about £500 minimum then you would have all the machining to do, you wouldn't get any change out of £700

there was a hybrid called an ultraspool which used a ball bearing CHRA but it was fitted with a larger compressor wheel although it retained the standard turbine wheel and v band housing

have you measured the inducer of the compressor wheel to see if it's a standard compressor wheel or a larger one

I'll take some measurements when I get a chance, I'm just wondering if it's, perhaps, one with a 'modified' configuration, like the 360 degree screwed bearings and stepped oil seal? Just trying to figure it out, it may just be a spare std. TB2810, as I've little experience of all the ins and outs of the Coupe's modification paths, although I'm quite technically knowledgeable, on ce I know the details.