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Old 08-19-2012, 12:48 PM   #817
Scooby Specialist
Member#: 856
Join Date: Feb 2000
Chapter/Region: International
Location: Cambridgeshire, England, UK
2005 JDM STi


Originally Posted by jura11 View Post
Here is next competitor to the LM,SC(Blouch in USA),MD(Lateral Performance) and others

Its Owen Development Twin scroll turbo,still is under testing,but looking like good option

This is on the 2.1 with JDM STi AVCS heads and Chevron TMIC

457 BHP @ 6500rpm, 465 LbFt @ 3750rpm on V-Power 99RON + 20% meth(blue line)

405BHP @ 6500rpm 420lbft at 3750rpm on V-Power 99RON(red line)

This turbo still is under testing,but looking will make more power in final stages

Hi Guys,

This is my car/engine setup.

I've been doing some development work with Owen Developments and Chevron Motorsport to come up with something that will give me the same spool as my Stock VF37 turbo, but produce more torque and power, i think we are there now.

The turbo is a proper twin scroll, with roller bearing core, Garrett serge port equipped compressor housing with billet compressor wheel, inconel waste gates and Owen spec turbine wheel.

Currently it is mapped to 1.85 BAR and 135,000 rpm on the road, which is limited because of the OEM MAP sensor in use. I now have a Perrin 4 BAR map sensor which will allow us to take the boost up to 2.0BAR, we will run a peak turbo speed of 145,000 rpm. On the Rolling Road it was a very hot day with 24 degrees Ambient, so it only pulled 1.75BAR and 132,000rpm, the engine is road mapped. Charge temps were also higher on the rollers than i see on the road.

For those saying it's the 2.1 that is the reason for the fast spool, below is a DeltaDash Road Dyno comparison of this engine with the stock VF37 turbo installed running a 33% mix of VP Q16 race fuel, 66% 99 RON pump fuel, compared to the current setup on a 20% mix of methanol and the spool is identical, the current setup actually spools 100rpm faster on plain 99RON fuel.

At the moment we have a Samco turbo inlet pipe that is collapsing under load, so top end is being strangled a little too. Once we have a new inlet pipe fitted and have done another mapping session i'll update the thread.

Any questions ask away, some of you may remember me from the motorsport forum many moons ago, i'm not a newby, just been a tad busy the last few years.

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