converting our turbos to td03.5

[paulbonner84]

guys i know this is probaly been discussed in depth before ,but here gose .i have been chatting to a turbo company today about refurbing my turbos and ended chatting about how lame our turbos are ,and he seems to think he can hybrid them to be td03 on the hot side and td04 on the cold side ,just woundering if anyone else hase tryed it and if so how well did thay work ?

[Davezj]

as i remember it
i believe it has been tried and the issue was the compressor wheel undoing itself from the shaft and trashing the compressor wheel in the process.

but there will be other that have actually tried it.

[foxdie]

Interested in this

[paulbonner84]

from what the bloke was saying is 2 ways to do it.one is get a doner td04 cold side and use that instead of our standard one ,so the only pipwork needed to be changed would be the y pipe ends, or can put billet wheel in our modded houseing.will find out more when i go in next .will keep you all up to date

[Davezj]

i think the reason why the nut kept on coming undone was the exhaust wheel is trying to spin at the same speed it was when it had the tiny compressor wheel (about 230,000 rpm) the TD04 compressor wheel does not want to spin that fast. so the TD04 compressor wheel wants to undo the nut all the time.
also the TD04 housing i have will not fit up to the TD03 exhaust housing.

i am sure a turbo shop will be able to get something ot fit, and possibly replace the exhaust shaft a wheel for something with a revers thread possibly.
as i say i am not 100% sure on this it was about 3 years ago when all this was discussed.

there are threads on here about it.

i think 'Hybrid turbo' is the search string you need.

[paulbonner84]

i did know what you ment dave ,seen it happen on a mates auldi ,only the nut ended up inbeded in a valve .once i have been down there and spoke to him i will let you all know what he says is possible with our turbos ,and if we can solve the problem of having to change everything then its a great will for all vr4 owners that want more power without the hassle of having to have manifolds downpipes ect made up then all the better

[Davezj]

be interesting to see what you come up with, just remeber you have to have you car dynoed just before you make the change and only change the turbo then dynoed afterwards to have a realistic gauge on power increase.
dont chage anything else otherwise you can't give a power figure increase for the upgrade if you had any type of idea of marketing a kit.

[hbkuk1]

I would be interested also

[MarkSanne]

If it wasn't for that stupid oil filter neck, any turbo upgrade would've been so much easier... It's that front side that really is the tricky part of a conversion. Despite I'll be going for the 2x TD04 conversion myself, this is an interesting topic!

[billybobboot]

Oil filter neck isnt an issue at all as long as you can get the replacement turbo to sit high enough up. Ive got gto turbo housings on and it cleared it just and they have long turbo necks if you can use a short turbo neck it clears with ease. I had 3 issues putting my turbos on 1 was 1 turbo bolt and 2 was the clearing my big ass rad. My td04s sit almost in the same position as the td03s did to the point i have used nearly every stock coolant and oil pipe. 3 was the front engine mount after its all on with a slight mod to the bracket i could put it back on but i just went for a polybush rear engine mount to give the suport as the front on mine did nothing as the bush was broken..
Td04 scooby turbos are easyer to fit but gto tdo4 spool up faster as they have a smaller exhast wheel. I havent had it mapped but cant go over 3k as the turbos are kicking in.
I would advise not doing a td035 upgrade just go td04 but i would recomend scooby turbos just for ease of fitting at the manifold end. But if after close to stock spool go for gto, mine was also made harder by i could only get 1 gto housing so had to use 2 of the same also my adapter plate wasnt quite right match as there are 2 diffrent manifold -turbo flange patterns.

[Davezj]

As far as I know the filter neck is not a problem if you are modifying the original manifold with a new flange, it only becomes an issue if you try and piggy back the td04 flange on to the manifold.
In this case you always have the option to fit a filter relocation kit and remove the filter neck.

Personally I would not go for a hybrid conversion as it will not be as efficient as a full td04 conversion and the gains will not be as large . It will always be a compromise.

But that is just my personal opinion.

[billybobboot]

Stock cams are the killer weather running stock turbos or not these should be your first mod.

[billybobboot]

You cant get a relocation kit in between the block and turbo there just isnt room a plate will fit in but the pipes no the real answer is to cut off the stock ones in half and have a thread put in and the pipe them to a relocation kit. This is what im going to do next but to get it running i havnt done it but i have started to build it i have already cut the neck and threaded them i just need to order the 2 inserts

[billybobboot]

This will mean a stock turbo man can be used with just a flange welded on the everything become easyer.
My oil filter kit i will take pics.
I plan to the redo my front manifold using stock man with flange and bolt the turbo to it to see where it sits the issue you will get is too low and the stock (stock design) down pipe may have to be cut then your into problem of warrantys if you ever need to claim. Ive modded everything elts so the bought parts arnt modded so i can claim if something goes wrong like the rad ect ive made the car fit the rad not the rad fit the car. Same with the turbos make the car fit them not them fit the car.

[Adam.Findlay]

problem is the stock manifolds are rubbish. your shooting youself in the foot fitting good turbos to stock manifolds

for hybrid TD03's see this thread
http://www.ozvr4.com/threads/jungles...y.1670/page-43

[billybobboot]

Yes they are but without spending lots on custom manifolds its not always an option.

[paulbonner84]

Right guys , I have took the turbos to the bloke to see them and we have come up with as follows
Changing the compressor wheel to a transit 2.2 .witch is 4mm taller and on the nut end it's 4mm wider witch in turbo tums it's the equivalent of going from a td0414 to a td0419 if that makes sense lol.thay looked at all the parts and housings and there is enough metal on the compressor houseing to mechan out .so will find out in January weather it was worth paying the extra £50 per turbo rebuild .was getting them rebult anyway .

[adaxo]

What sort of cost will be involved for this conversion?

[paulbonner84]

its costing £270 per turbo
the breakdown of the cost
£200 to refurb turbo
£50 for the bigger compressor wheel
£20 to have housing milled out (may vary depending on where its done tho )
once ive got them back and fitted i will get the car dynoed again at area52 ,when it was done early this year there it made 212atw and nothink else has been done engine wise.will be good to see how much of a diffrence it makes
I know it wont make as much as if i done a td04 converson ,but this will be for those of us that want a bit more power but dont want the hassle of the converting

[adaxo]

That's looks promising, £540 for both tubs is not bad me think, esp in comparison with tdo4 conversion cost. Looking forward for results, if it give 20hp more is worth the money.