Twin Turbo Conversion to Single Turbo

[overboost4]

Hey guys, i've got a 1995 7th generation Galant Twin Turbo VR4, i've recently blown the rear banks turbo and was about to start getting it replaced when my brother asked me "why dont I just convert it to single turbo?" So here I am, wanting to convert it to single turbo. How would I go about this guys? What parts would I need, is it hard to do, can anyone here help me out with some steps? I love this car to peices, and I dont want to just leave it in the driveway collecting rust like all my other car's i've blown up have done! Haha.
Cheers guys (and gals?)

Josh

[4-G-rim]

You would have to buy a prefabbed kit with manifolds and piping or have something custom made. To convert to a single turbo setup you wil have to redo the manifolds to work for a single turbo setup since the factory setup it twin turbo with a turbo on each manifold. Either finding a kit premade or having one custom made..its going to take some $$$ unless you can fab up your own piping and manifold design.

[master_visionary]

Run the front headers under the engine put a twin scroll in the rear ones place fmic and a custom cowl hood you should be good. Then mail me the parts you discard so I can tinker

[overboost4]

Ahh well that just sucks doesn't it haha. Sorry im a bit of a newbie with engine mods and shit aye, only just left school and am getting into cars now. So what do you mean by prefabbed kit? Would it just be cheaper to replace both the turbo's and keep it twin turbo? Because I only really plan on using it as a weekend driver, uses far too much gas especially with my heavy foot :P

[master_visionary]

Well then just fix it you seem to lack the knowledge or true desire to pull off a mod like this

[overboost4]

Alright i'm here because i'm new to this, im asking for help from people who do know what they are doing, admittedly I dont know what I am doing, hence why I am asking for advice. I've got mates who do know and who will help me, but I want to know what people think before I slap down a lump sum to get it done, if you dont have any advice for me, dont post, simple.

[master_visionary]

Ok I wasn't tryna dog you just saying this is the kinda mod you gotta commit to so with that being said lets build (in theory) your engine is already made for boost so your good there, twin turbos give you quicker spool while single gives you more later with a longer spool so if you drive between 2-4k stay twin, you like being 3-6k go single. To go single.. choose if you want the Turbo fore or aft the engine. Then eyeball a pipe layout based on available clearance. Fore the engine means less intake piping =quicker spool but more exhaust piping = higher engine bay heat . Aft the engine means less exhaust piping = lower bay heat but longer spool times (by a few hundred RPMs) so consider the gain/sacrifice margin of each setup and then let me know and ill sketch something up.

I would personally love to see you pull off a big T VR4. Good luck and if you do get your hands really dirty makes the car that much more enjoyable

P.S. this will be custom but seriously badass

[overboost4]

Nah sweet as mate, is there any way to upload pictures here? Ive just got a picture of my engine bay so I can post up and show you. I was thinking my engine is on the right side of my bay, so would there be a possibility of putting it on the left hand side of the engine? Kind of not before, but not after the engine if im making sence? That way i wont be compromising excessive engine bay heat with slower spooling etc, it will all kind of even itself out that way? But yeah not too sure how to post up a picture... Cheers

[master_visionary]

Yu got a smart phone

[overboost4]

Yeah I do mate but I live in New Zealand LOL, you got a hotmail address or something? Could send you a picture through there.

[master_visionary]

[email protected]

Send em

And download the photobucket app then just copy paste the image URLs from there

[mko]

so what you want to do is to route both sides exhaust to the spot you want the turbo to be. The easiest spot is in front of the engine like this. in this case you'll have to plug and remove the rear oil feed line and the oil return line and also plug the holes on the rear side of the oil pan.

http://splitsecondmotorsports.com/SSM/single01.gif

and here's a prefabbed kit

http://www.ipsmotorsports.net/images/IPSsingleMock-up6.JPG

you might wanna look into the 3000gt vr4 stuff and get yourself familiarized with these thing before attempting such conversion. the 3000gt parts might work on your engine too.

the 7gs in the US didnt come with v6 so you its hard for us to explain things that no one has done before. The only singe turbo converted Galant i have seen is Mante's and its an imported 8g vr4.

[overboost4]

That.... Is beautiful. Lol. So what kind of turbos do these twin turbo's run do you know? I have been looking on google and a bit on here but I just can not find out what they are, I was told my turbos are TDO4's but im not too sure, can't seem to find that anywhere on the turbo.
Cheers

[master_visionary]

Get me them pics I have something in mind

[overboost4]

Yeah mate just sent it now, tell me when you got it because I dont know if I done it right LOL

[master_visionary]

Just curious what tie is it where your at overboost its 2am here and I'm across the hall from my wife messing with this 2g Turbo I just was given

[overboost4]

Its exactly 8pm over here dude. Wanted to go out and have a play with my car but its a bit dark for that lol

[mko]

your stock turbos are 13b or 13g, im not sure, but for a single turbo conversion to a 2.oL v6 i'd start with at least 16g if not a 50 trim turbo

[overboost4]

Sorry mate, can you tell me that in noob language? Haha

[master_visionary]

Go big .. and the downside of putting it between the banks is its over the tranny and heat kills trannies

[master_visionary]

your stock turbos are 13b or 13g, im not sure, but for a single turbo conversion to a 2.oL v6 i'd start with at least 16g if not a 50 trim turbo

Curios where does the T25 fit in

[overboost4]

Ahh yeah thats true didn't even think about that. So what do you guys recommend? Putting the turbo at the front or the back? I would need to custom make new intake manifolds etc wouldn't I?

[master_visionary]

Custom is best yu can put you name on it. The email failed mmm add the pics as an attachment ...hey do you have the diamond edition bumpers in NZ

[mko]

no t25 is not a direct bolt on, plus its the worthless turbo ever.

no custom intake manifold is needed, just new intercooler piping

you can start by deciding ho much money you want to spend on the turbo. shop around the NZ car forums and see what turbo you can find

[overboost4]

So thats all I will need to buy? Is new intercooler piping? I can just use one of my turbos I already have?

[master_visionary]

no t25 is not a direct bolt on, plus its the worthless turbo ever.

no custom intake manifold is needed, just new intercooler piping

I asked about the T25 because I have one ill be putting to work on my g I was just curious as to where it falls in 13 14 16 thing you mentioned its from a GSX. Well why do you say it's worthless?

[mko]

well since you want to go from 2 to 1 turbo, there will be some extra piping with no use in the engine bay and since things will kind of be relocated you'll most def. need new ic piping

[overboost4]

Have sent you an email master_visionary

[mko]

it pushes less air than 14b and it cant support the 4g64 after 5k rpms. it just runs out of air. the most i've seen is 300 out of 2.0L dsm and it made that much just because of the awesome tune it had.

[eclipsh]

Have you done any other work to the car to make going single turbo worth while or is it basically stock? There is no point in jumping to a big single turbo setup if you don't have any supporting mods to back it up. Also, given that you're still just running 2.0 L, I wouldn't go too big on that turbo. The longer exhaust runners required will likely make it spool slower than a similar size turbo on the 2.0 4 cylinder. Are there NZ members who have gone single turbo? I honestly doubt it would be worth the time/money versus a small upgrade to your twin turbo setup and some good supporting mods. Do you know what the bolt pattern on your turbo looks like? Would a pair of 14b turbos bolt up? They are dirt cheap here in the USA, probably the same there or nearby. If they don't bolt right up the exhaust housings may be interchangeable. Just things to explore before diving off the deep end.

Also, do you use your weekend warrior for back road fun or for drag racing? For drag a big single turbo probably makes sense but for anything else staying twin turbo for the quicker spool will likely serve you better.

EDIT: Noticed the T25 won't bolt up so the 14b won't either. I'd still check into swapping housings around if possible.

[mko]

i think the manifolds have 3 bolt pattern just like the 3000gt turbo and they have some variation of 13g turbo. the most common upgrade for 3000gt's are twin 15g out of volvo