GTX2867R or GTX3067R?

[Hurdy]

First question is what power do you want? Then from there you work out what size turbo, and what size exhaust housing you need.

You don't really need to worry about lag as you laugh in the boost range and always change gear back into the boost range.

A solid 450 - 500bhp just on v-power.

[rich83]

First question is what power do you want? Then from there you work out what size turbo, and what size exhaust housing you need.

You don't really need to worry about lag as you laugh in the boost range and always change gear back into the boost range.

A solid 500-550 bhp just on v-power.

 

[vRSAlex]

First question is what power do you want? Then from there you work out what size turbo, and what size exhaust housing you need.

You don't really need to worry about lag as you laugh in the boost range and always change gear back into the boost range.

A solid 450 - 500bhp just on v-power.

Doing any engine work?  What manifold?

[Hurdy]

HPA intake mani and Charlie Orpen's mate James at Nortech will be making up the tubular exhaust mani and the exhaust downpipe. Similar to the 1.8 one below.

[vRSAlex]

As I know you will want more power eventually, then go for the GTX3076 with the smaller .63 exhaust housing.  This will give you 450 at low boost, and over 500 bhp on high boost.

You would ideally need the head porting and a full supertech valvetrain setup to allow faster spool and a raised rev limit.

Don't forget clutch packs, and chuck a diff in at the same time.

I should have my test SEM inlet mani soon.  Will be a fraction of the cost of the 30000000000% bigger HPA  .

[Hurdy]

Going to see what the OEM pistons and rods will take first and probably stick some race cams in there. Not sure on the wastegate make yet either. Possibly a 45mm rather than a 40mm. Saw a couple at Autosport with new designs, so looking at one of those maybe.

The Clutchpacks will most likely need doing before the internals!

[Hurdy]

Hahaa, looks like we were on the same wavelength at the same time with our posts Alex.

The GTX3076 will come later. I like experimenting. The turbos don't cost that much comparatively and I'd most likely be able to get back a fair chunk of each one I use once I take them off. I want a good match of day to day driveability and power, so may even buy two turbos eventually and build the engine, swap into a smaller turbo for the daily and then to a big ass one for track and 1/4 mile.

[dan930]

This is getting intreasting

[GrayMK5GTI]

First question is what power do you want? Then from there you work out what size turbo, and what size exhaust housing you need.

You don't really need to worry about lag as you laugh in the boost range and always change gear back into the boost range.

A solid 450 - 500bhp just on v-power.

Just had a look into my crystal ball and I can see you saying this in 12months:

"I'm after a solid 550-600bhp, which turbo shall I go for? or should I stick a 5pot in there?"  

[dan930]

First question is what power do you want? Then from there you work out what size turbo, and what size exhaust housing you need.

You don't really need to worry about lag as you laugh in the boost range and always change gear back into the boost range.

A solid 450 - 500bhp just on v-power.

Just had a look into my crystal ball and I can see you saying this in 12months:

"I'm after a solid 550-600bhp, which turbo shall I go for? or should I stick a 5pot in there?"  

I reckon he will do the 5pot & the turbo 

[Twiggy]

 

my ex girlfriend told me that bigger is always better!

[BEN81]

Unless your chancing numbers from a drivability side if things I wouldn't run the 3076 I run a 3071 and it still has quiet a bit of lag but doesn't bother me due to it being a track car... I would consider a borgwarner EFR turbo as a few people I know have gone over to these and in the twin scroll format they come on boost really low down and pull like a train!

Edit to say my GT3071 equipped car is an escort cosworth

[Poverty]

If the EFR fits then EFR.

Remember my mates evo that did 9.1 sec 30-130's on a gtx35? Well my other mates evo with a EFR and 100hp more pulled 10 car lengths on him running 40-160. 100hp difference should not equal 10 car lenghts EFR = 

[BEN81]

This is my buddy's VAG engine efr equipped lotus exige running in time attack.... 800kg's running around 500hp.... Should be interesting 

[Hurdy]

GTX3067R running on Statller's dyno on a Golf R.

Some more tweaking to do but this is a very basic set-up and to get the figures below it was running.

1.6 bar boost through the n75 on a GIAC stage 3 map.
99ron VPower
Pump mode on the map

This R has a stock engine, stock head etc etc and this run was done On a stock Intercooler before fitting the upgrade one!

The scale is blurred a little on the horizontal axis due to the Windows task bar but runs from 1500 to 7000rpm at the yellow line.
Dotted plot is the stage 2+ GIAC extreme map before the fitting of the larger turbo on the same car.

Statllers dyno reads fairly low in comparison to say awesome GTI or R-Tech and you can add a good 6% to the figure on the graph below, which would be 446 x 1.06 = 473bhp.