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Small turbo to big turbo conversion

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Old 16-10-2005 | 03:54 PM
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Default Small turbo to big turbo conversion

I know it's been posted before but can't find it...
So what exctly is needed to make this conversion?
I know Turbo,ECU,loom but what else?
Old 16-10-2005 | 04:06 PM
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right you need:

turbo
inlet manifold and throttle body
injectors
crank pulley and sensor
ecu
coil
ignition leads
dizzy
air charge sensor
water temp sensor

and while your there you might as well stick 3 bar and some greens in
Old 16-10-2005 | 04:10 PM
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AFAIK swapping inlet has no sense as small turbo one is better. Fitting dizzy doesn't make much sense to me either.
Old 16-10-2005 | 04:10 PM
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cheers m8
Old 16-10-2005 | 04:12 PM
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Originally Posted by Azrael
AFAIK swapping inlet has no sense as small turbo one is better. Fitting dizzy doesn't make much sense to me either.

wether it makes sense or not that is what u need to do the easiest and cheapest conversion.
Old 16-10-2005 | 04:13 PM
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Originally Posted by Azrael
AFAIK swapping inlet has no sense as small turbo one is better. Fitting dizzy doesn't make much sense to me either.
I think the big turbo ecu should has coil pack drivers fitted if one wants not to fit dizzy....
Old 16-10-2005 | 05:04 PM
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slightly obtuse i realise - but there is always the route of buying a big turbo in the first place ? - they're cheap enough! but the more that get converted to big turbo the rarer the damll ones are becoming!! so the value must go up!!! lol i hope so anyway
Old 16-10-2005 | 05:16 PM
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isnt the exhaust manifold different aswell i remember a friend having trouble when he converted his
Old 17-10-2005 | 08:26 AM
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Originally Posted by Glenn5
isnt the exhaust manifold different aswell i remember a friend having trouble when he converted his
im not 100% sure but i think it bolts straight on
Old 17-10-2005 | 12:46 PM
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Downpipe is different, manifolds are the same.
Old 17-10-2005 | 12:57 PM
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Only if your going into 400+bhp you should change the exhaust manifold to a 2wd one. Keep the small turbo inlet as it IS the best one!!

Ive priced this conversion up quite a few times, you could do it for about £1300 with used parts, but I wouldnt go down that route.
Old 17-10-2005 | 01:36 PM
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worth considering changing to a aftermarket managment system, lot less agro & keep most of the origional parts.
Old 17-10-2005 | 03:06 PM
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Originally Posted by Ryan_Belfast
Only if your going into 400+bhp you should change the exhaust manifold to a 2wd one. Keep the small turbo inlet as it IS the best one!!

Ive priced this conversion up quite a few times, you could do it for about £1300 with used parts, but I wouldnt go down that route.
YUM has 470bhp with a 4wd ex manifold...not that bad at all i guess...
Old 17-10-2005 | 03:07 PM
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Originally Posted by Power Engineering
worth considering changing to a aftermarket managment system, lot less agro & keep most of the origional parts.
yep...you only have to put a bigger turbo on...and injectors off course..
Old 17-10-2005 | 04:11 PM
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Originally Posted by wimwerf
Originally Posted by Power Engineering
worth considering changing to a aftermarket managment system, lot less agro & keep most of the origional parts.
yep...you only have to put a bigger turbo on...and injectors off course..

Ehhh theres a bit more to it than that winwerf.
Old 17-10-2005 | 07:03 PM
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Im mid way through mine now,The exhaust manifold is definitely different as the hole where the turbo bolts to is smaller. You can use the downpipe off a small turbo as its the same. When you price it up an after market system is actually cheaper and brand new rather than using all second hand bits which still fetch a lot of money. I have been quoted approximately a grand for omex ecu and adapter plug which uses most of the original sensors and loom. I will need a differnt map sensor and have purchsed a set of focus rs injectors which i have been told can take a focus to near 380bhp. Hope this helps, either way once u have ditched eeciv ecu its gonna be quicker
Old 17-10-2005 | 08:17 PM
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Originally Posted by tim10_10
Im mid way through mine now,The exhaust manifold is definitely different as the hole where the turbo bolts to is smaller. You can use the downpipe off a small turbo as its the same. When you price it up an after market system is actually cheaper and brand new rather than using all second hand bits which still fetch a lot of money. I have been quoted approximately a grand for omex ecu and adapter plug which uses most of the original sensors and loom. I will need a differnt map sensor and have purchsed a set of focus rs injectors which i have been told can take a focus to near 380bhp. Hope this helps, either way once u have ditched eeciv ecu its gonna be quicker
at last a price! not as epensive as i thought it would be. rondells or power
Old 18-10-2005 | 07:47 PM
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I've also priced this conversion using an after market ECU as I couldn't see the point, in my view, of taking the retrograde step of fitting a distributor and was is an old ECU by todays standards. Much better to keep the coil packs.

For most of the ECU's I looked at they used the existing Loom and only required one sensor to be changed. Then it's only your choice of injectors, turbo, head gasket and setup to be paid for.

My personal choice was between the Altronic, which required an interface loom between its self and the cars loom and the EECIV version of the SCS ECU which is a straight plug in.

I haven't done it yet as the car still scares me (I am 51 after all) and I started building a xpack which now takes all my spare cash!
Old 19-10-2005 | 09:15 AM
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Originally Posted by Ryan_Belfast
Originally Posted by wimwerf
Originally Posted by Power Engineering
worth considering changing to a aftermarket managment system, lot less agro & keep most of the origional parts.
yep...you only have to put a bigger turbo on...and injectors off course..

Ehhh theres a bit more to it than that winwerf.

we done the managment conversion on a small turbo a few weeks back, the managment conversion & mapping was about £2000 + injectors & a few sensors, the guy kept it on the T28 for now, when he has a bit more cash he is going to change the turbo aswell, it will need a quick remap when the big turbo is fitted, but it will still keep it under the £4000 he was qoated for a marelli system & T34.
Old 19-10-2005 | 10:09 AM
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Ive got a small turbo converted to t34, only problem i have got is the rev counter jumps and skips i ve heard this is something to do with the change of loom ?

can anyone help ?
Old 19-10-2005 | 12:05 PM
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mine was done @ A1 rallysport. shit load cheaper than what people are saying! ! give them a ring. they do a quality job @a good price
Old 19-10-2005 | 01:23 PM
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Was a good feature on this in a performance ford a few months back,step by step
Old 19-10-2005 | 01:31 PM
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Originally Posted by steanosport
Ive got a small turbo converted to t34, only problem i have got is the rev counter jumps and skips i ve heard this is something to do with the change of loom ?

can anyone help ?
pretty sure the small turbo uses a diff rev counter,check on microcat
Old 19-10-2005 | 04:35 PM
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YEAH I VE HEARD I NEED A RESISTOR IN THE WIRING ?
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