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Some of this week's Letters to AutoSpeed!

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Tuning Tool

I've been looking at various AFR meters to do on-road tuning of a Jaguar V12 XJ-S with a Wolf EMS system - do I need a wideband meter like this or will the cheaper narrow band meter like theSilicon Chip ones in the AutoSpeed store work just as well?

Iain Burgess

We strongly advise a wide-band AFR meter for this type of application.

Latched Onto the Ignition Interceptor

Re your response to a letter at Response...

Can you give us an idea of what the up and coming Ignition Timing Adjuster will be all about?It sounds very tasty. Keep up the good work.

Howard Hartman

Nothing has been finalised as yet, but stay tuned!

Ulka Pump Info

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Do you know the thread size of the discharge pipe of the "Ulka" pump that was used in the "World's Best Intercooler Water Spray"? I'm here in the States trying to get a hose to fit the outlet and I think it might be a straight metric thread. Any help will be appreciated.

Scott Haines

For further information we suggest contacting the manufacturer -

Wastegate Can Volume?

In at least one of your articles or columns, you make mention of placing a "can" in-line with the wastegate to change the spool-up rpm. I was wondering if there is some sort of a rule of thumb or other guidance (practical experience?) relating the volume of the can to the engine displacement or rpm or....

Andrew Miller

Trial and error is the best way to achieve your desired boost characteristics. However, as a guide, in the article Killing Wastegate Creep we used a reservoir having a capacity of around 250cc.

Better Boost?

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I have a general query re two articles by Julian Edgar. In around October 2000 he described a boost control system called the "Audi Boost Control", which seemed a good system to build and which was described as being superior to most electronic systems. He now describes an electronic controller that can be purchased in Do-It-Yourself form. My question is: Under what conditions should one system be chosen over the other? What are the pros and cons that we should consider before building ONE of the systems?

Andrew Bosch
South Africa

The Audi system (which uses two pneumatic valves) was devised to give adjustment of maximum boost pressure as well as adjustment of the rate of boost. By tuning one of the valves you can configure the control system to give very gradual boost rise or, as most people want, the fastest possible rate of boost rise (ie like running unwastegate’d until the preset boost pressure is reached). Cost of the system starts at around AUD$80 and it is relatively easy to setup. Now for the IEBC... The IEBC uses electronic control to give a boost curve that’s adjustable at 64 load points and there’s the choice of two different maps (selectable via an in-cabin switch). The 64 points of adjustment are related to injector duty cycle which effectively means boost is proportional to throttle position. The 64 points of adjustment give a lot of flexibility – you can have...

Boost reach its peak level and stay at that level

Boost increase progressively until the redline

Boost reach its peak and then progressively decease

Boost reach its peak and then hold steady until the last 1000 rpm, where it gradually decreases

Boost come on gently with lots of wastegate creep

Boost come on as hard as physically possible by keeping the wastegate closed longer

....or whatever other boost behaviour you want

Total cost is around AUD$140 and it’s a bit more challenging to set up – not one for beginners! In any case, we suggest that you stick around – we have a two-part series on boost controllers coming up!

EWP Test Results

Re Testing the Davies Craig Electric Water Pump... Can you give me a hint - was it no good? I was going to buy one but now I'm worried.

New Zealand

Unfortunately, we are unable to give any information relating to our tests. We suggest asking if the retailer will give a money-back guarantee if the product doesn’t live up to its claims.

BMEP Beast!

I was interested to read about the BMEP (Brake Mean EffectivePressure) method of comparing engine power outputs – re The Real Way of Comparing Engine Designs. The Honda TypeR BMEP seemed impressive until I calculated the value for the VW Golf Mk4 turbodiesel - 112kW from a 1.9-litre engine at 4200 rpm gives a BMEP of 16.95! I wonder if any turbocharged petrol engines can compete with that? If there were an equivalent measure of specific torque production I imagine the VW would be even further ahead, with 320Nm of torque from 1.9 litres.

Ben Garside
New Zealand

More on Badge Engineering

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Re Badge Engineering... It might be interesting to observe that there is another connection between two of the cars mentioned in this article. The SAAB 900, powered by the GM V6, was built on a similar platform to the contemporary Vauxhall Cavalier, which in turn was substantially carried over from the previous model. This previous model was sold in Australia, with some local engineering input, as the Camira.

Also, I believe that there is a minor error in the article - JE Camiras were equipped with a 2.0 litre engine only.

Andrew McKellar

You’re right – correction now made.

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