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Some of this week's Letters to AutoSpeed

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Re Ford Hidden Data

Regarding Ben's letter about the instrument diagnostics for the EF Ford Falcon - see Response... A description of the modes can be foundat Free registration for the site may be needed to view the document, but it is quite worthwhile to do so - there are heaps of other tipsand tricks there.

Steven Taylor

ADR 27A Standards

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Re your article Emissions Regulations - Part One...

ADR27A did have emission standards. ADR27A states a maximum of 2.1g/km hydrocarbons, 24.2g/km carbon monoxide, 1.9g/km oxides of nitrogen and 6.0g evap test. PCV, EGR, evap emission controls were all just a way of passing the standards.

Richard Fay

One-Way Valve Search

You certainly like a challenge - as indicated with your Prius project. Would you be able to tell me where you sourced that one-way valve you used in the fuel system for the Prius? (The Story of Turbo'ing a Hybrid Prius, Part 4) Do you have a part number?

Tony Goodlich

The one-way valve used is a 5/16 inch in-line aluminium bodied valve from South Coast Diesel Injection (+61 7 55325427). Cost is AUD$20.

Another LPG Injector Source

I was reading the first bit of Response and saw that Peter de Vries is after some LPG injectors for his BMW. We might be able to help out - our website is

Brad Guelfi

Audi Octane

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A short question from your AudiA4 S-Line article (New Car Test - Audi A4 S-Line )...

Why is it essential that you use 98 RON fuel? Is it an absolute must as you will otherwise destroy the engine or is it only to get the max power out of the engine?

Thomas Soerensen

Audi literature states that 98 RON fuel should be used but if it isn't available, you can use 95 RON. Power output will be slightly reduced. In emergency situations, 91 RON fuel can be used. So, essentially, the extra fuel octane is to achieve maximum performance - but we’re not sure what would happen with your warranty if the engine failed while running normal unleaded...

Water Injection for Carby Engines

Would it be possible to include an article on water injection kits for carby cars? Or, if you already have one, could please notify me of where it is?

Josh Bragg

If you haven’t already, have a look at Water Injection. We haven’t detailed water injection specifically for carby cars.

Tapering Exhaust Diameter?

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In the article The Cheapest Exhaust You've Ever Heard Of, Part 2 you write "Given that less pipe diameter is needed as you go towards the rear of the car, the use of press bends (rather than continuing with mandrel bends) wasn’t a problem".

You never mentioned this concept before. I always thought and read that, because gas speed is reduced at the end of the system, pipe diameter has to be bigger if anything at the end.Can you please explain a bit further?

Lex van Opstal

We have raised this idea in the article Out the Exhaust - Part Two. Reducing pipe dimeter toward the end of the system is common practice in many factory exhaust systems and the superb Air Power Systems (APS) aftermarket exhausts. Good enough for us!

NZ DFA Install and Tune

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Is there an agent in New Zealand to buy from and install the Digital Fuel Adjuster (DFA)? And who do I talk to about the benefits of it – power, economy, etc?

Barrie Keall
New Zealand

There are no allocated agents but any competent tuning workshop should be able to install and tune the DFA. The gains from fitment of this product will largely depend on how rich the car is currently running and how lean you’re willing to tune it!

How Many Cams?

I read your article Practical Performers - Part One and now plan to buy a Nissan Maxima. In the article you say it is quad-cam but on top of the engine it says twin-cam. What is going on???

Christen Rasmussen

Each cylinder head has twin camshafts and the VQ30DE has two cylinder heads, which means there’s a total of four camshafts.Good luck with your new buy!

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