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Some of this week's Letters to AutoSpeed

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World’s Best Water Injection?

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Many thanks for your "World’s Best Intercooler Water Spray" articles (see World's Best Intercooler Water Spray, Part 1). I would like to know if this pump/nozzle arrangement can used to create the world’s best water injection system. Will there be undesirable lag from triggering the pump or is it constant pressure? I would be using the motor speed controller - Motor Speed Control Module - Part 3 - Water Injection.

Alex Ball

We can’t see why the pump and nozzle can’t be used to good effect in a water injection system. However, the Ulka E5EX pump’s 240V AC solenoid motor can’t be used with the DC Motor Speed Control module but you might be able to run a 240V light dimmer instead – an idea worth trying!

Yet Another Pump

Another intercooler water spray/water injection pump alternative is "The Ideal Pump" found at

This pump is capable of flowing 1.4 gpm (3785 cc/m) at 100 psi. I do not have any further information on it besides what is found on the website - it may be an incredibly noisy pump, I don't know. The advantage that I see is it is 12V DC so you don’t need to use a power inverter. Also, the power of this unit is less than your latest and greatest - but I still think it is very sufficient for the job and it’s cheaper. A review of this pump used in an intercooler spray role would be quite interesting.

Tim Fulton

Thanks for the link – looks like a pretty good pump. But we must point out that the Ulka E5EX pump we used was tested to a massive 360 psi – a helluva lot more than 100 psi! This pressure is very important in getting small droplets.

Jag Feedback

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You just knew there'd be an email from me as soon as you ran a Jag article - The Xplosive XJ!

Minor errata - in your headline on the XJR you state "last of the XJ series", which isn't correct as you can see here - There's a '05 XJ (and XJR) listed available for sale. What you meant, I presume, is it's the last of the X300/X308 body shape which was replaced by the X350 in mid 2003.

FYI not mentioned in your story is that the XJR100 is a special centenary - and

John Littler

You’re absolutely right - we meant to say that the XJR100 is the last of the X300/X308 series.Our article does mention that the XJR100 was built to celebrate the 100th anniversary of the birth of Jaguar founder, Sir William Lyons and that just 500 examples were built – but, yes, these points could have been made more prominent in the article.

Thermocouple Q

I enjoyed very much reading the article on building the thermocouple controller TempScreen: Part 4 - Building a Custom Temperature Display. Instead of using a screen, though, I intend to connect a thermocouple to my GReddy e01. Anyway, I was wondering why do you connect the number 1 pin of the AD595Q to the ground? I have tried it your way and if I connect the device’s ground wire to the chassis or negative battery lead I get false readings. If I don’t connect the ground wire and simply use a voltmeter between the output pins and ground it works fine. This way, it seems I don’t need to connect any ground wire. Could this be happening because one of the thermo inputs is connected to the ground (pin1)? What would happen if Idon’t connect pin1 to the ground and only connect it to the thermocouple?

Dany Pistiner

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As seen in this diagram, Pin 1, 4, 7 and 13 should normally connect to earth. However, if the system works better by not connecting Pin 1 to ground, don't!

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