Turbo Advice.

[ChrisGT]

New poster! (less than 10 posts)

Hi Guys,

I noticed My standard T2 has started smoking a little on idle, Im assuming this is the sign of the seals etc wearing. I have a T25 Tomcat turbo at home and was wondering if there is a way of merging the two to make some sort of Hybrid. I like the response of the T2 but would like a bit more punch as it were. I know people merge housings etc. Is this possible with the two turbos I have?

Any help on this would be great as Im taking ther engine out the weekend to do lots of things including a 285 cam, Head set, Engine mounts etc. My Carb is fueled for 20PSI so im overfuelling on this turbo anyway as it had a T25 on it previously.

On a side note the T25 I have that was donated to me didnt boost when i fitted it up last time. It was very strange but all the shaft/Wastegate etc seem too be in good order. You fit the turbo up and you can hear it spin up but the is no boost achieved at all. It produces alot of pressure if you cover the pipe coming from the Turbo when its bolted on but when driven despite hearing it spool up it does not produce boost.

Any Ideas anyone?

Thanks in advance.

[Romil Davda]

Hi mate, these days there is not much that is not possible...

You can pick up a T2/T25 turbo (has a T2 exhaust and T25 compressor), your better off (cost wise) to pick up one of these, regardless of needing a rebulid.

[ChrisGT]

New poster! (less than 10 posts)

Hi mate. Thanks for the reply. That's what I was wondering as I have a T25 and a T2. So I can merge the two and make a good one without having to buy anything.?

[Romil Davda]

Yes I guess you could mate but I recon you'd be better off buying the said unit.

I had a KTR180 before I fitted my Rover tomcat T25 and the KTR180 worked a treat... Started pulling at just over 2K and would be good for 15psi (some say 20psi but I wanted mine to last!). I hear what you say about the lag but the differance in boost makes up for it, from a t2 to t25.

PS. I got the KTR180 sitting in my front room if you want to "try it" on your car?

[ChrisGT]

Ahhh you had to go.and offer me one lol. How much would you want for it. So what is it. A T2 hybrid or something. I would love to try it and see how it goes. Are you about tonight. ?

[ChrisGT]

Does anyone have any insight on why my t25 would not make boost and also what I have to do to merge The T2 and T25?

[Romil Davda]

Ahhh you had to go.and offer me one lol. How much would you want for it. So what is it. A T2 hybrid or something. I would love to try it and see how it goes. Are you about tonight. ?

PM sent mate

[JP Racing]

Ok you could make a turbo using your 2 units but you would need to match the compressor wheel to the right housing so let's say you put the compressor wheel from your t25 on the t2 turbo you would need to have the unit balanced to be able to run without it shatting it's pants in no time at all. Oh and while it's being balanced best have the bearings replaces as its already apart. Then you would also have to make sure the compressor housing fits too so you might need a different backing plate to make it fit.

The cost involved in doing that is not really worth the gain best off buying a good second hand one if you can find one which you know is good trying Romil's turbo and finding it works fine and is good money might be a better option

Also could be a few reasons why you t25 isnt holding boost
Is the actuator working how it should
Is the turbine housing cracked so it's bypassing the turbine
Are the bearings ok as the wheels could be catching on the housings
Is your manifold leaking making the exhaust gases bypass the turbo long shot but you never know lol
Eerrrrrmmmm that's all I can think of but I'm sure there are more reasons for it

[ChrisGT]

Ok you could make a turbo using your 2 units but you would need to match the compressor wheel to the right housing so let's say you put the compressor wheel from your t25 on the t2 turbo you would need to have the unit balanced to be able to run without it shatting it's pants in no time at all. Oh and while it's being balanced best have the bearings replaces as its already apart. Then you would also have to make sure the compressor housing fits too so you might need a different backing plate to make it fit.

The cost involved in doing that is not really worth the gain best off buying a good second hand one if you can find one which you know is good trying Romil's turbo and finding it works fine and is good money might be a better option

Also could be a few reasons why you t25 isnt holding boost
Is the actuator working how it should
Is the turbine housing cracked so it's bypassing the turbine
Are the bearings ok as the wheels could be catching on the housings
Is your manifold leaking making the exhaust gases bypass the turbo long shot but you never know lol
Eerrrrrmmmm that's all I can think of but I'm sure there are more reasons for it

Hi Mate,

Thanks for the reply, That gives me alot of things to think about. It is very strange because you can hear it spooling up. I would think that means that the bearing would be ok, It does have a crack in it between the turbine and the wastegate. But im told most of them do. I know my T2 does.

How do i test the actuator?
My T2 works fine so im assuming it wont be the manifold.

Maybe Romils is the best way to go at present. I may wind my T2 down a little as its running 16psi at the mo, and im fitting a 285 cam and some other goodies at the weekend. I only noticed the smoke last night after fitting a double cap intercooler and a induction kit. Obviously its made it all less restrictive and now it wants to **** itself as you said.

[Romil Davda]

How do i test the actuator?

Get a Bicycle pump with a gauge on it. Connect up the pump to the acturator and see at what psi the acturator lets off.

I had a fooked acturator which you could actually blow into to release it!

[ChrisGT]

Hmmm I wonder if that is it. I'll try that this weekend. Does it matter what port you use. It has two on it.

[car.crash]

I told you that t25 was rubbish. Bin it mate, It keeps doing the rounds yet never works.

[ChrisGT]

I know mate but it has to be summin silly. It spools up everything looks ok but no boost at all. After this weekend mate I may not ever wanna see a 5 again lol.

Cant wait to have the engine out though.

[Pete@Backyard Racing]

I had the same problem with the t25 tomcat I fitted to russ's car (rebel 5 Gt turbo) a few weeks ago. Single port actuator holding the wastgate shut really tight. Sounded like it was boosting but made no boost on 2 different boost guages (mechanical) the car felt really flat. No boost leaks tho.???
I put the STD t2 back on and that boosted fine???

A different tomcat on my car a few years ago was fine the only differences were a proper forge blanking plate and actuator.

[car.crash]

When I fitted it to mine at cadwell park it hissed and whizzed and sounded epic but made no boost. We tried everything to make it spool, new actuator, removed pipe off actuator, locked waste gate shut to no avail.
I got so fed up I dropped from flat out 4th to second gear and popped the engine to call it a day. Proper diva tantrum over a turbo that was meant to be good but fit for the bin.
Don't let it ruin your day, bin it

[rs250nut]

When I fitted it to mine at cadwell park it hissed and whizzed and sounded epic but made no boost. We tried everything to make it spool, new actuator, removed pipe off actuator, locked waste gate shut to no avail.
I got so fed up I dropped from flat out 4th to second gear and popped the engine to call it a day. Proper diva tantrum over a turbo that was meant to be good but fit for the bin.
Don't let it ruin your day, bin it

So let me get this straight you ruined your engine because you fitted a bad turbo?

[Pete@Backyard Racing]

Shifted from 4th to second to force the turbo to boost and damaged engine prob from over revving.

[rs250nut]

Shifted from 4th to second to force the turbo to boost and damaged engine prob from over revving.

I know that, I just find it a bit crazy to kill an engine beacuse you have a bad turbo

[car.crash]

Yep, stupid hey.
I Managed to pick a new engine up for £50 and it was fantastic
The turbo has been lurking around dans for a few years now and has reappeared again. Get a turbo specialist to look at it if you need it to run. It came off the boards here through a few members and ended up with dan as someone sold their car with his fitted and that t25 was passed back in return.

[steer from the rear]

I had a turbo once off that dude ms Motorsport use to use that wouldn't boost from new.......it would spool just not boost
Sent it back and turns out they never ballanced it correctly!!!!!!

Could some one of had the core apart????