T25 and T28 Pikey options

[V Man]

This has probably been asked more than enough times but maybe we need a new updated list.
My current T25 blower seems it may be on its last legs and I may rebuild it following on from successful rebuild of Mark chunk goony cole and Ashy at the week end

Other pikey options I know of:

Nissan 200sx
Nissan 300zx ?
Rover Tomcat.
Saab 9000
Renault Diesel van (not sure which one maybe on Emma's car?!)
BMW Vnt (not sure which one)
Landrover Turbo??

What about the Nissan s14 T28'? can you modify them to fit and any good with a lairy cam?


Can people add to the list perhaps?

[Sy5GTT]

I think Spooky had a T28 stolen from a Nissan fitted to his 5.

[Spooky]

Size wise it was similar I think but it was designed for the GTT in the first place

[Sy5GTT]

Saab 9000. I thought they had a different exhaust fitting. Is it just a case of swapping housings?

[V Man]

Saab 9000. I thought they had a different exhaust fitting. Is it just a case of swapping housings?

I think you need to rotate the housings and maybe change the exhaust side.

[James5]

The BMW VNT is a 330d or the X5 with the 3.0 diesel engine, also found on other vechicles aswell, alfa's, Jeep, Merc's to name a few but there are mods required and not exactly cheap to mod unless you have the tools to do it yourself.
You will need to make a manifold adaptor up (as it is not a direct fit for the R5 manifold), rotating housing so oil drain is @ bottom, modified oil drain pipe, adjust the vanes so acutator sits correctly, adaptor for oil feed, custom turbo elbow for VNT.

I have just done a VNT conversion myself (just need a custom elbow now)



I think the cheapest and easiest turbo to mod is the old T25 tomcat, as the only things you will need to purchase extra are oil feed adaptor and dump valve blanking plate and there are so many tomcat turbos for sale.

[V Man]

The BMW VNT is a 330d or the X5 with the 3.0 diesel engine, also found on other vechicles aswell, alfa's, Jeep, Merc's to name a few but there are mods required and not exactly cheap to mod unless you have the tools to do it yourself.
You will need to make a manifold adaptor up (as it is not a direct fit for the R5 manifold), rotating housing so oil drain is @ bottom, modified oil drain pipe, adjust the vanes so acutator sits correctly, adaptor for oil feed, custom turbo elbow for VNT.

I have just done a VNT conversion myself (just need a custom elbow now)



I think the cheapest and easiest turbo to mod is the old T25 tomcat, as the only things you will need to purchase extra are oil feed adaptor and dump valve blanking plate and there are so many tomcat turbos for sale.

That's an interesting read mate. You seem pretty dead set on the VNT I remember your earlier post..you obviously got cracking any pics of your progress on that turbo??. Yup I have tried one or two Tomcat turbo's!

[James5]

That's an interesting read mate. You seem pretty dead set on the VNT I remember your earlier post..you obviously got cracking any pics of your progress on that turbo??. Yup I have tried one or two Tomcat turbo's!

I have done the Tomcat conversion in the past and to be honest it is easy to do but they don't seem to last long with any increase in boost after being played with.


The only reason I have gone VNT is purely for the fact that I just lke the way the boost is delivered and you can adjust what rpm it comes in it aswell (They are bit like Marmite some people like it some people don't)
Here are a couple of pics of it after most of the modifications required as said before just need oil feed adaptor and a rear exhaust elbow.

[V Man]

So how did you get around the exhaust housing? Did you just swap the back ends?

[James5]

Pm for you matey

[V Man]

Cheers James.
I still have a Nissan pulsar turbo in the garage but its got an enormous arse and even if I fitted a smaller back end on would take for ever and a day to spool. I think I'll keep it for my 2.016v engine.

Anyone know if the s14's are not quite as laggy?

[raj]

im thinking about slapping a t25 on the 5 before i sell it, im assuming the t25 is more lag free as opposed to a t28.?
a t28 would be good for motorway off boost driving yes.?

so, on a budget, what t25 could be bought for not much money and/or not too much faffing arond with housings etc..?


im also looking for a wideband sensor and gauge, to help with setting up fuelling for a larger turbo. im thinking of going for the aem uego.!

[V Man]

Aye. T25 is quicker to spool than a T28 due to the smaller wheels.
As James5 mentioned a rover Tomcat with a bit swivel and an rotating of the core is the easiest route to go and cheap as chips

[raj]

Aye. T25 is quicker to spool than a T28 due to the smaller wheels.
As James5 mentioned a rover Tomcat with a bit swivel and an rotating of the core is the easiest route to go and cheap as chips

the only thing that concerns me with the tomcat turbo is that they are known to give up the ghost pretty quick! is there any particular reason why the tomcat units dont last that long?

[V Man]

I had better luck with the 200sx one but having said that it's just gone i think

[Matt Cole]

the only thing that concerns me with the tomcat turbo is that they are known to give up the ghost pretty quick! is there any particular reason why the tomcat units dont last that long?

TBH all the T25's mentioned are only capable of a max 1 bar before they eat their own arseholes. They have a 270 thrust which would be useless for any higher boost for a reasonable length of time.

[raj]

TBH all the T25's mentioned are only capable of a max 1 bar before they eat their own arseholes. They have a 270 thrust which would be useless for any higher boost for a reasonable length of time.

ahh ok, so fitting a 360deg thrust bearing would help then.?

[Matt Cole]

yes it would. Along with total seal rings.

[Sy5GTT]

I'm sure Tony (Fishead) used a tomcat T25 at the Yeovil RR day and hit 206bhp.

[raj]

yes it would. Along with total seal rings.

total seal rings.? is that a turbocharger part are are you talking piston rings now

ive actually got a tomcat turbocharger and im thinking of refurbishing it myself, so far ive noted that a 360 bearing is a good idea, just havent got a clue on where to buy a "Full" rebuild kit from i can see a few on ebay but ive read some random posts that there either sh1t or ok soo

so where to buy a rebuild kit inc 360 bearing and total seal rings? providing the rings are part of a turbocharger

[James5]

I'm sure Tony (Fishead) used a tomcat T25 at the Yeovil RR day and hit 206bhp.

He did indeed but his was a new one (so didn't have the 500k + on it ) and he had a 360 bearing

[V Man]

He did indeed but his was a new one (so didn't have the 500k + on it ) and he had a 360 bearing

How do you "convert" the turbo into a 360 bearing type? Isn't the exhaust housing different? I am thinking I may as well try and sort my existing T25

[R5GTTRaider]

its just a plate
basicly it has a slot out of it on the 270 thurust bearing

only good for 15/18psi like said

plus i suppose a nice trim size can be put in there as well

[V Man]

its just a plate
basicly it has a slot out of it on the 270 thurust bearing

only good for 15/18psi like said

plus i suppose a nice trim size can be put in there as well

So you just swap the bearings and that's it?

[Scoff]

Just a plate ? Its a precision bearing!!! You also need the matching 2-part thrust collar to match the 360deg bearing. I don't know about T25 cores but with the T3 frame the bearing needs new holes drilling and tapping to accept the new bearing.

[Scoff]

As for being good for x amount of boost, there's a lot more to it than that! oil pressure, turbine pressure, how long you want it to last, etc. 360deg can sometimes not even last as long as a 270deg bearing if oil pressure is marginal.

[V Man]

Just a plate ? Its a precision bearing!!! You also need the matching 2-part thrust collar to match the 360deg bearing. I don't know about T25 cores but with the T3 frame the bearing needs new holes drilling and tapping to accept the new bearing.

Mmmm precision always gets me a bit worried margin for error seriously increases maybe not worth the hassle ???....

So in theory using Brigsy's kit and drilling and tapping it will convert a 270 into 360 bearing?

[Adam L]

Brigsy's is one of our kits. The standard thrust bearing is screwed down and the 360 degree one has the same hole pattern, so there's no modifying needed to fit it.

[V Man]

Brigsy's is one of our kits. The standard thrust bearing is screwed down and the 360 degree one has the same hole pattern, so there's no modifying needed to fit it.

Nice one Adam you turbmeister

[Matt Cole]

Is there already a 3rd hole there then?

[Ashy]

the thrust collar in that pic looks like a 270 degree type?

[V Man]

the thrust collar in that pic looks like a 270 degree type?

Does it? How can you tell?

[Ashy]

Does it? How can you tell?

the 270 degree bearing has a slot through for the collar to slot into. The 360 degree one doesn't so you need a 2 piece collar. Might just be the photo tho?

[Adam L]

That is a two peice collar, some have a tophat style underside and others are flat... Our ones are flat.

[V Man]

the 270 degree bearing has a slot through for the collar to slot into. The 360 degree one doesn't so you need a 2 piece collar. Might just be the photo tho?

I think adam supplied the kit so it should be bob on.

[Ashy]

That is a two peice collar, some have a tophat style underside and others are flat... Our ones are flat.

I stand corrected then, must be the photo!

[Sparkie]

I stand corrected then, must be the photo!

got the orthopedic shoes on again.....