2,5L SOHC Turbo Mod?

[jayp]

Like i said that's pure guess work. Please don't take what I have said as accurate, I'm a mechanic by trade, but tuning and modification is a hobby. You would need to look into the amount of air required normally measured in CFM (cubic feet per minute) and match that to a turbo.
But logically I don't see why a single td-03 wouldn't do the job. It depends how much boost you want to have.

As for intercooler, normally bigger is better, but it needs.to be a good design to have as little pressure drop across it as possible, but still be able to cool the air as much as possible. Fmic would be the easiest option, obviously if you went Subaru style.you would need to modify the bonnet to match and have the room to start with and liquid to air would be harder to plum in, plus space again.

Sent from my HTC Desire S

[crazydriver81]

Well, why not start with off the shelf parts where possible?

Take VR-4 manifolds plus turbos and downpipes should be an easy on e to try things out. You can lower the boost a bit to 0.5 bar or similar and try how its running.

If it's promising, you may consider a single turbo conversion, which will involve a lot of welding.

As for the ignition and so on, you may stick to the V6 NA ignition system. Only thing you need to care about is, how to control the boost solenoid, when max boost is reached.

I would assume, due to the smaller diameter of the NA manifolds, that the TD03 turbos will not spool that good, hence they will not reach the 0.6 bar as on a VR-4.

But that is also guess work. I have seen a V6 SOHC Turbo in Japland once, but I do not know how it was done.

To sum that up:
- get some VR-4 manifolds and turbos second hand
- get some boost pipework inc. intercooler from a VR-4 second hand
- get some cooler spark plugs (NGK BKR7EIX or BKR8EIX)
- get a solution for boost control
- put it together and try how it's running

This should be your cheapest option as the main difference between NA and TT is the ignition system and boost control. If can leave the ignitioan system as is, this would save you a lot of hazzle. Good luck!

[Galant_martin]

Sounds good

Can i control the boost via a electronic? To limit the max pressure to ~0,4 bar

What are the cheapest controllers who do that work?

[Galant_martin]

Or just a manual boost controller with a gauge would do the same job or?

[crazydriver81]

Don't know, honestly. Maybe an adjustable blow off valve and a boost gauge will do the job as well?

Can MBC's (manual boost controllers) also turned to lower the boost? I thought they can only be used to raise boost from the stock level??? Can anyone confirm?

Oh, and I forgot, you need to solve the way to connect oil and water lines to and from the turbos. At least the oil lines for the front turbo will not fit without the oil filter mount from a VR-4! So you will need the oil/water lines from a VR-4 as well.

[Galant_martin]

Yea but i can modifiy the oil line from NA if i do singleturbo?

In two days i meet a guy who is a metal worker, he can weld all things
To bad that im only electrician..

I think a MBC can lower the boost if he is mounted between wastegate and turbine.. than he opens the wastegate more so the exhaust turbin gets lower RPM->
compressor wheel spins lower->
lower boost

am i wrong?

[Anderz]

Sounds interesting, have thought of this aswell, as I have spare manifolds and td03:s an a NA galant But here we have no chance of passing MOT after that, so best to forget it. An MBC cannot be used to make lower boost than the stock wastegate actuator pressure. A boost controller raises boost by limiting the pressure reaching the wastegate actuator.

Your best bet is to modify the wastegate actuator to a lower pressure. But it would indeed be cool to control the WG actuators with electrical motors/servos, that would give total control of the boost
what is the stock wastegate pressure for the td03:s, 0,5 bar?

[Galant_martin]

Yes thats true.. the yearly car check here would be hard too with that tuning..
But thats another piont

And if we use the normal wastegate pressure and let the blow off valve lower the boost?

[Anderz]

That is also possible. But personally I would modify the WG actuators, it only needs a suitable springcoil to help it open a little bit earlier

[Galant_martin]

So u wanna say thats more easy to change the spring?

So why not haha.. i just looked under my hood too see how we could do the single turbo thing.. i think i should change the fans to SPAL fans or?

[Galant_martin]

So now its weekend and ive been reading something about turbochargers

Vr4 stock use TD04?

TD04 9B 265 CFM ( smallest)
to
TDO4L 15C 390 CFM (biggest)

so my single turbo should be around 500-550 CFM? Than i would see to buy a

TDO5H-16G 505 CFM

am i right ?

[jayp]

Vr4's use td03's mate, the td04 fron subaru's are often talked about as an upgrade if keeping the twin setup

Sent from my HTC Desire S using Tapatalk 2

[Galant_martin]

Oh sorry

I dont finde correct specs, how much cfm brings a TD03? 200?

So i need max. ~400cfm, a

TDO5H-14B 405 CFM

thats the same what is used in old eclipse i thing.. 13b or 14b..

[psbarham]

td 04's go to a 20K.

they are good for 600+ as a pair, just ask mclaren

[Galant_martin]

@psbarham

sry i dont know what u mean..

should i not add the two turbos if i wanna build a single turbo?

I only want 200-250hp out of my SOHC engine..

greetings

[psbarham]

@psbarham

sry i dont know what u mean..

should i not add the two turbos if i wanna build a single turbo?

I only want 200-250hp out of my SOHC engine..

greetings

I'm saying there are logins in the td04 range that will deliver the flows you need.

[Galant_martin]

So i need to get one used (cheap^^) TD04 turbo to see how i can mount it..
In ebay there a some but i have no idea which i should use.. different flanges..if anyone has good links please post

In the next days i must go under my car to remove rust so i take a clear look how i can do my mods.. damn rust...

A wideband lambda would be a must have too or? Bosch LSU 4.2 would cost about 90€ the cheapest i found.
A point of my project is too get it as cheap as doable

My breaks would do the job if i have the big breakdiscs? (for 15" + rims ) And i use EBC discs and Redstuff breaks.

[Ghost_2008]

You'll have to consider additional mods to the fueling system, if your upping the air intake then you'll have to manage the air to fuel ratio, so delivery and monitoring.

You'll need a wide band lambda and a means to adjust the fueling, so a stand alone or a piggy back ECU... you might find you start to be limited by the standard injectors..... this you will not know until your set up and testing..... running lean will destroy your engine.....

You could look at FTO 2.0l non-Mivec turbo conversions, you will be able to draw similarities..... it's been done more so than on a sohc 2.5l.....

In any case you could end up with a lot of trial and error, I would speak with Ben from Eurospec as they have done a number of conversions and should be able to give you some sound advice...... good luck

[Galant_martin]

Thanks for your good tips

I think i have found a person who welds pretty good (he closed a rust hole very good and has a welding device in his garage)

So the biggest things would be the exhaust pipes and turbo mounts.. ive googled and looked in ebay much times.. bit im indecisive which one i take cuz they all have diffrent typse of flanges..

Can u show me what u would take/have?

[Galant_martin]

Hello soo cuz i have not much time right now i was busy..

Ive readed more about a belt driven Supercharger.. and yes the belt system would be much more easyer i think!

Im really not sure what would be better.. SC is good cuz it has big NM's with low rpm's.

And i think im able to built a belt system much better than weld and try out exhaust pipeings...

Btw can i install any other ignition systems?