raj_vr6

I'd say that set up is more for 4 cylinder engines really.
The VR's produce a lot of heat on the second bank due to the design, take a bit of compensation tuning, as such, although the heat can help with higher gas speeds, it can also obviously be a bane (we all know cold, dense air makes power, heat destroys components etc). 
That set up uses the larger GT35 side turbine, so it is set up for decent gas flow at the expense of speed over a 30, so it should make this hot gas a bit cooler then as the flow would be slower, kind of what we want, but then it is somewhat strangulated with the small a/r to give it better low end manners, but this in turn speed's up the gas we've just wanted to slow down!
This turbine set up can have it's benefit's and it can operate a bit differently over the same a/r on a 30 as can be seen here;
 
 
 
It just seems like it's one for the 4 cylinders in that respect, these VR's have decent flow with the extra 2 cylinders plus we've not even mentioned things like running higher compression ratio's with greater efficiency/less heat/knock (off boost driving characteristics for day to day) and so on.
 
On the compressor side; a quick bit of maths like on Garrett's website, means that a potent 100% VE 2.9 running 7000rpm would be pushing about 15psi to hit 500hp. In reality it's more like 17-20psi. So let's plot that on the compressor graphs;
 
 
As you can see, the 35 sized compressor wheel is pretty much perfect for these in terms of compressor efficiency, it also keeps the wheel speed lower at desired hp/flow targets.
 
It is a bit of a tricky question to answer, tuning is always a balancing act really, but most get a bar of boost at mid 3000rpm's on a 35 0.82 and are very happy, will also do 500+hp with ease. I can see the point of a 35/76 hybrid but it seems like a 550hp turbo for 4 cylinders, enough flow for decent top end, but strangled to keep low end happy. There's lot's more to tuning as well like compression ratio, timing and of course efficiency. We've also not mentioned the size of orifices T3 v T4 etc which have an effect on gas speed.
 
P.S. If you have the money and want a bit better road manners, a properly made twin-scroll exhaust manifold slaving the gasses correctly, using a GT35R with the 0.78a/r twin scroll housing on a T3 would be a nice one I reckon. But most are happy with a potent cast log 0.82 35r for less!

Thought I would post up some pictures of the wife's daily 1997 mk3 Golf VR6. Its a Highline and also an automatic, So far we have only done some maintenance work to make sure it all works right before we do any modifications. Having said that it does already have a full stainless system with 6 branch manifold and a set of coilovers. 
 
Plans will be fairly low key with it being a daily driver. We have some standard headlights to fit as the light output is terrible with the smoked units, also got some Rear smoked VR6  units to fit. I have a few sets of wheels in the garage including Porsche Twist reps and 16'' Merc E-Class wheels. Will most likely be the Merc wheels as the Twists are 17x9 on the rear lol. Will be a few other bits and pieces as and when i acquire them. 
 
Some pictures as it stands just now and a few pictures from the UKMK3's meet back in August. Along with my Mystic Blue 8v and my Brother inlaw's Indian Red VR6.
 

Very nice mate , look forward to the turbo build

Got me private plate going on, crystal rear lenses, full mulberry leathers going in, brembo brakes all around, full body respray then going to bite the bullet and put a turbo on it with a chrome parts on engine bay. For next year she is going to be transformed and definitely going to turn more heads. Going to take step by step pics and upload on here so you guys can see what I'm doing

Love opening the garage, makes me smile.. She's going to look great over the next few months

Rear lights now changed to crystal/red ?

Thanks guys for your kind words. Will defo be bringing it down to shows in the future

Hey guys,
 
Got some spare time on my hands so thought i'd upload some pics of my daily VR 
 
Only had it for 2 years and already cost me a small fortune  
 
Current mods are a full milltek exhaust system and Ram air induction, seeing just under 200hp
 
Engine is strong and had the chains re-done recently. Plan is to stay OEM although the Vento front end is really appealing to me right now.
 
Contemplating putting in a Rotrex charger    
 

 

 

 
New wheels on....
 

 

 
- Raj

Hey guys,
 
Got some spare time on my hands so thought i'd upload some pics of my daily VR 
 
Only had it for 2 years and already cost me a small fortune  
 
Current mods are a full milltek exhaust system and Ram air induction, seeing just under 200hp
 
Engine is strong and had the chains re-done recently. Plan is to stay OEM although the Vento front end is really appealing to me right now.
 
Contemplating putting in a Rotrex charger    
 

 

 

 
New wheels on....
 

 

 
- Raj

Hey guys,
 
Got some spare time on my hands so thought i'd upload some pics of my daily VR 
 
Only had it for 2 years and already cost me a small fortune  
 
Current mods are a full milltek exhaust system and Ram air induction, seeing just under 200hp
 
Engine is strong and had the chains re-done recently. Plan is to stay OEM although the Vento front end is really appealing to me right now.
 
Contemplating putting in a Rotrex charger    
 

 

 

 
New wheels on....
 

 

 
- Raj

Hey guys,
 
Got some spare time on my hands so thought i'd upload some pics of my daily VR 
 
Only had it for 2 years and already cost me a small fortune  
 
Current mods are a full milltek exhaust system and Ram air induction, seeing just under 200hp
 
Engine is strong and had the chains re-done recently. Plan is to stay OEM although the Vento front end is really appealing to me right now.
 
Contemplating putting in a Rotrex charger    
 

 

 

 
New wheels on....
 

 

 
- Raj

Differences between v1 and v2:
 

I have a vortech v1 and a 2.75" pulley producing 9PSI with 380cc injectors and pulling 294BHP. I would expect similar figures for this depending on pulley size and of course if it has an upgraded impeller. 
 
I have standard head gasket too.