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Some of this week's Letters to AutoSpeed

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AFM Issues

I have bought a Nissan Maxima VG20ET and now I need an airflow meter – and, no, Idon’t seem able to buy one... You have had an article on an interceptor but you don’t say whether it would work with a faulty AFM. Any help would be appreciated.


The DFA isn’t intended for use with a dodgy airflow meter – it’s unlikely that using the DFA to change the meter’s voltage output will be a solution to your problem.

More than Spritely...

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In regard to your test of the Mazda3 SP23 ( Mazda3 SP23 Test)... You state that "the 2.3-litre engine delivers spritely performance – but nothing more".

My girlfriend took her Mazda3 SP23 to a street meet at the Kwinana Motorplex and ran a 15.39 ET at 91 mph which, in my books, is a bit more than spritely! In fact, I feel that it’s very quick for an NA hatch! Her car is completely standard apart from a set of lowered springs and dark tint. The result has caused a bit of controversy on the forums and no-one has been able to match the time yet. We also found that throttle response is noticeably improved when using 98RON premium unleaded, as opposed to 91 RON regular unleaded.

Keep up the great work!!

Joe Saraceni

Wrong Graph #1

I'm afraid that the graph shown in the "World's Best Intercooler Water Spray, Part 1" is not the right one. It's not from an Ulka E5 pump, but from an Ulka E4 pump. I have to admit, I also had trouble finding the right graph at the Ulka website as all links on their site point to, but the right page for the E5 graph is This also means that the pump can indeed deliver over 200cc/minute at 10 Bar (145 psi). The E5 pump can also flow 300cc/min at 8 Bar (116 psi) and 400cc/min at 4.9 Bar (71 psi), while the E4 pump can't even come close to that.

Furthermore, the E5 pump is not intended for continuous use but it may run for one minute and then be left to cool for another minute. It probably won't matter if combined with the Intelligent Intercooler Water Spray Controller, but for people who toggle it manually or with a boost switch, the pump will burn out in a few minutes.

I'm currently exploring the possibility to replace the coil for a 12 Volt one, so a simple pulse generator with a FET can pulse it. This means the converter is not needed and the whole unit takes up a lot less space. If this coil is a little bigger, it can be used continuously too, without getting too hot. Should I find such a coil, I'll let you know and also include a schematic of the simple electronics needed to pulse the coil.

I hope you can use this info to improve an already very nice article.

Bas van Elten

Wrong Graph #2

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In "World's Best Intercooler Water Spray - Part 1" World's Best Intercooler Water Spray - Part 1 you say you'reusing the Ulka E5EX but show the graph for the E4, which is quite a different pump. The correct E5 graph can be found here - E5 graph

Also, regarding the mounting issue in Part 2, there seems to be some mounting brackets available as seen here - It looks like they fit like a collar around outlet and being made of rubber should help with vibration isolation.

Ashley Rogers

Thanks for pointing out that error. The graph has now been changed.

Not the Most Powerful V8...

I just thought I'd let you know that your article, "The World's Most Powerful V8" should be re-written to acknowledge the Chev Corvette Z06 which has 376kW and 637Nm naturally aspirated using the new SAEJ2723 standard. With 'old' single cam-in-block, 2 valves per cylinder technology as well! And notice in the picture of the AMG V8 on the dyno - it is running without the power sapping alternator...

Richard Bull

Well spotted – we’ve recently covered this engine at GM's LS7 7-litre V8 and, as you say, it’s a 373kW/657Nm monster!

VDO Pump Install

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I bought a Holden VDO water pump through your site and I didn’t receive any kind of instructions with it. I want to know how it should be fitted - what is the inlet and outlet, what angle can it be fitted and does it need to be below the water source?


The VDO pump should be installed so that water is drawn into the end hose fitting and is expelled through the fitting on the side of the body. As seen in the pic Installing an Intercooler Water Spray it should be mounted at the bottom or below the water source. Any angle should be fine.

VDO Pump Specs

I’m looking for a replacement pump for my intercooler water spray system. I am currently using a standard washer pump.Can you tell me how the flow rate of the Holden VDO pump compares to a normal washer pump?


We no longer have any information on the VDO pump but we can tell you it’s one of the better ones. Whether or not the VDO pump is an improvement depends how well your current pump performs!

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