Turbo twinspark conversion - Alfa Romeo Forum
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Turbo twinspark conversion

Mucking about the other night thinking about turbo conversions on Alfa engines.

Look at these pics - it looks like the TS is almost ready-built to take a turbo. Well, except the bottom end:

1.9 JTD turbo exhaust manifold bolts straight to Twinspark head:

IMG_0109.jpg

You can see the holes tapped in the block for the manifold lower supper would now no longer be used - these could be used for a turbocharger support bracket to be mounted to:

IMG_0108.jpg

Locations already tapped for a potential turbo oil feed & return:

IMG_0110.jpg

IMG_0111.jpg

Any Twinspark owners up for having a go?
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Interesting! You could have a go with mine, but it would probably blow up
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Well Autodelta did a Turbo TS for a while, so it is certainly possible.

I would go down the Fiat Coupe engine route if it was me.
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Autodelta job is ££££££££££££ though

This looks like a good idea, wonder how much it would cost?
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the jtd manifold looks just as shabby as the fiat coupe's manifold...
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Yep, stick one on the 145
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Quote:
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Interesting! You could have a go with mine, but it would probably blow up
And that is exactly why I haven't tried it

I don't think the bottom end is up to it. And also if you used those two holes tapped into the oil cooler mount for an oil feed and return, would it impact on the lubrication of the bottom end?

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the jtd manifold looks just as shabby as the fiat coupe's manifold...
They are a bit scruffy but they don't ever seem to crack, at least not when fitted on the diesels..
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And that is exactly why I haven't tried it

I don't think the bottom end is up to it. And also if you used those two holes tapped into the oil cooler mount for an oil feed and return, would it impact on the lubrication of the bottom end?
.
Would also be unfiltered oil...
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Would also be unfiltered oil...
I did consider that as well, but there still would be some oil flowing through the filter, not all the oil is filtered each time it goes around the engine. Perhaps if the turbo feed was taken from the clean side of the filter and the return put straight back into the sump, via a purpose made tapping or even by the dipstick hole, that would help keep the filter working at full effectiveness. But the worry would be drawing oil off from the clean side of the filter, would this impact oil pressure at the bottom end?
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nice to see this, a relative of mine did the same thing turbo manifold of a 159 jtdm (works at an alfa dealership). fitted perfectly, however the cooling line what runs on the front side of the head has to be relocated. how is this the case with this jtd manifold (the same?)
I think the bottom end will hold it, if you dont run more dan 0.5bar of turbopressure.
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Quote:
Originally Posted by Pud237 View Post
1.9 JTD turbo exhaust manifold bolts straight to Twinspark head:

Attachment 102264
SOunds interesting - are you 100% sure that 1.9JTD's exhaust manifold will fit TS's without any modifications.
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Mine has the turbo oil feed taken off of the filter housing (I'll check to see if it is the upper or lower ) and returns directly to the sump via a welded. pipe.

The bottom end will be fine as long as the oil is kept topped up as is the case with all Twinsparks.
Mine has a front mounted intercooler.
120,000 miles with a T25 turbo fitted driven hard.
Only issue I had was following a heater hose which was cut by road debris which caused it to overheat and wrecked the cylinder head gasket, incorrect head gasket was then fitted which then wrecked two pistons - melted !!
That was at 70,000, been ok since repair
Mine is a CF3 - the cr is lowered by using the earlier thicker head gasket.
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@Mike
from where did you get the thicker head gasket?
do you have some pic's on you turboproject
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The thicker head gasket is just an earlier genuine Alfa gasket, the CF3 came with the much thinner metal ? gasket so you just replace this with the earlier thicker one.

Mine is an original Autodelta conversion. Bought it already converted so not my project as work already completed !

PM me with you email and I'll send some pics
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Quote:
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SOunds interesting - are you 100% sure that 1.9JTD's exhaust manifold will fit TS's without any modifications.
You can see it in the pics, it fits. Its a bare (scrap) engine though so I don't know what its like with ancillaries on. I think the only potential problem is the aluminium coolant jacket that runs across the front of the engine.
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You can see it in the pics, it fits.
Have some doubts - i measured today JTD's distance between first and second upper(left to right direction)dowels, and there is difference compared with my TS sitting next to it.....
However if pipe holes lays same way, it can be easy to use anyway with new dowels.
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Mine has a elephant trunk attached to the original top section of the manifold , the turbo then sits under the aircon compressor.

It cost £200 to have it fabricated in stainless with the T25 flange.

This guy works wonders...

Alan in Brixton SW London.

http://solid-fabrications.co.uk/default.aspx

Last edited by MikeWhite; 23-10-10 at 12:24.
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Quote:
Originally Posted by MikeWhite View Post
Mine has a elephant trunk attached to the original top section of the manifold , the turbo then sits under the aircon compressor.

It cost £200 to have it fabricated in stainless with the T25 flange.

This guy works wonders...

Alan in Brixton SW London.

http://solid-fabrications.co.uk/default.aspxi
His welds look good, almost as good as the Wizard's

So you are using the short CF3 4 -> 2 manifold, then a custom section which joins that to the turbo, what about from the turbo outlet to the centre cat? And the rest of the exhaust system, have you gone up in bore at all?
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It seems that TS's and 1.9 JTD used same exhaust manifold gasket.....
LINK
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Who's going to be first to try it then? I'm trying to persuade Jason to fit a blower on his 145..
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Hello guys,

Its nice that this thread is going on now cause.. well im re searching to give it all a go

History and why:

Got an v6tb in my 155 that needs a rebuilt.. well after re map and such well go to..240 bhp.(squadra) All fun and such but i think its better too built the 2.0 TS Turbo because you got less weight in the front and around 220 BHP.

But: DOnt know how much space i got in the front of engine between engine and radiators, but i think its better too get one welded specially (manifold).. youll loose some money but you got better flow and can built it to be a perfect fit.

I am also using a turbo from a v6tb So any news foto's and such would be usefull for me as research.

@ mikewhite.. can you mail me some pics of your engine bay with the turbo and such I cant pm
And does solid fabrications still have the designs for the exhaust manifold or did you send one?

Keep you posted

Last edited by bas155; 23-10-10 at 20:37.
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You can have a look at mine to see how AD did it
You can pick up T25 turbos cheap enough, the pipework fotr induction is about £150 with fillter, the only other big expense would be the intercooler. The turbo exit to exhuast is easy enough.
How would you map it though ?
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The T25 turbo was fitted to the Rover 2.0 Turbo's such as the 800 Vitesse, 220 Tomcat etc, so there are loads about.

If it was me I would go with a T28, as it is capable of flowing more air, which will help power at the top end. The T28 was fitted to the 20V Turbo coupe, Nissan 200SX (And Pulsar), plus probably a few others.


I would worry about the TS gearbox going bang with the extra torque though. The Fiat Coupe Turbo gearboxes are far more robust, (And a lot heavier) than the TS item.

As for intercoolers, you can buy generic ones in various sizes. Just find one that fits and is as big as possible them plumb it in. You might find the intercooler and other pipework from a JTD can be made to fit straight in. The only thing is that Diesels don't have dump valves, so you will need to modify bits to get one to fit.

If you don't you will get randy pidgeon noises as the compressor stalls.

Giulietta 2.0JTDm (170)
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Quote:
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The T25 turbo was fitted to the Rover 2.0 Turbo's such as the 800 Vitesse, 220 Tomcat etc, so there are loads about.

If it was me I would go with a T28, as it is capable of flowing more air, which will help power at the top end. The T28 was fitted to the 20V Turbo coupe, Nissan 200SX (And Pulsar), plus probably a few others.


I would worry about the TS gearbox going bang with the extra torque though. The Fiat Coupe Turbo gearboxes are far more robust, (And a lot heavier) than the TS item.
20VT gearbox is similar to the Alfa V6 gearbox. So much so you can use the GTA clutch in one.
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I wonder if I can persuade Jus and Simon to fit a turbo to their 156 Selespeed SW instead of swapping in a V6?
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