Which turbo is right for me?

Picking the Right Turbo

Choosing a new turbocharger can be a daunting task, there is such a vast range of brands, models and options to choose from how can you begin to make a decision?

The Owen Developments technical sales team can narrow down the suitable range for you based on years of experience, testing and proven results. There are several different factors which are key in specifying a turbo for any given application; Does your application require a very fast responding turbo where torque would be the primary requirement, like a rally engine, or will it be an open circuit based set-up, requiring maximum horse power but at the sacrifice of low end performance? If the turbo is for competition use, do the regulations stipulate an air restrictor is fitted? The most important and first questions the sales team will ask you are-

 

 

Owen Development’s technical sales team
are on hand to guide you through picking the
right turbocharger, contact them via email 
technical@owendevelopments.co.uk 
sales@owendevelopments.co.uk 
or phone 01865 821062.

 

 1 - Make, model and year of engine and number of cylinders?
 2 - Engine size/capacity?
 3 - RPM range?
 4 - Does the car already have a turbo? What is the part number if so?
 5 - What is the application of the vehicle (road, track, rally, drag, drift)?
 6 - Are you running in a certain class? What are the rules?
 7 - What are your BHP goals?
 8 - At what boost level do you want to make power?
 9 - What fuel are you using?
 10 - What exhaust flange fittings will you be using?
 11 - Will you be running an internal or external waste gate set up?

 

 
Size comparison between Garrett GT25 and ODGT42HTA

 

 

 

 

The answers to these questions give the big picture on what you want to achieve and are the basis of specifying a turbo. The questions get more specific from here on as sometimes all the requirements cannot be covered by a single turbocharger and a compromise must be reached.

The classic turbocharger compromise is power or response, as improving one directly affects the other. To increase the power a turbocharger can provide it must be able to flow more gas, but by making it easier for the gas to flow the turbocharger is taking less energy from the gas to ‘spool’ it, slowing the response. Having a smaller A/R turbine housing will help spool, but restrict the top end power a turbocharger can provide, with the reverse also being true.

There are ways around this compromise with the most notable being boost enhancement, also known as anti-lag. Anti-lag generates its own problems however by massively increasing EGTs (exhaust gas temperatures) and compromising the reliability of the turbocharger. There are turbine housings and shafts designed to help cope with the higher EGTs but are very expensive adding another factor to deciding on a turbocharger.

Owen Development’s technical sales team are on hand to guide you through picking the right turbocharger, contact them via email technical@owendevelopments.co.uk sales@owendevelopments.co.uk or phone 01865 821062.

What does your Garrett turbo's name mean?

It may look like a mess of letters and numbers but there is a lot of information hidden in the name of your turbo, from the frame and wheel sizes to the kind of bearing used, it’s in there.

OD      The unit has been upgraded by Owen Developments.
GT      'GT' simply means Garrett Turbo.
X      The turbo has Garrett's next generation billet compressor wheel, found here.
35      The first number is the frame size of the turbo, based on the turbine wheel size.
86      Size of the compressor wheel exducer in mm, sizes over 100mm omit the first digit.
R      'R' signifies the turbo has ball bearings, superseded by 'HTA'.
S      'S' is used to differentiate between similar units with parts in common.
HTA      The turbo has a next generation billet compressor wheel. found here, supersedes 'R' and 'S'.
M      This turbo is built to full motorsport specification, more information can be found here.

 

 


 

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Owen Developments Ltd
28 Kingston Business Park
Kingston Bagpuize
Oxford
Oxfordshire
OX13 5AS

t: 01865 821062
w: www.owendevelopments.co.uk
e: enquiries@owendevelopments.co.uk
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