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Some of this week’s Letters to AutoSpeed

Wrong Hose!

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I don't need to say it again, but I will anyway... love your work! Great articles as always - unbiased and informative.

The reason for this letter is to point out a small fact in your article Plumbing Basics, Part 1...

You show a picture of fuel hose that is rated as SAE30R7 then talk about EFI hose. Do you know that SAE30R7 is actually low pressure fuel hose for carbie vehicles? A lot of auto stores try and pass this standard hose off for use on EFI vehicles - but it is not designed for high pressure EFI use! The correct standard for EFI hose is SAE30R9. This has a working pressure of 125 psi and minimum burst pressure of 900 psi. The SAE30R7 hose is only rated for 50 psi and a minimum burst pressure of 250 psi. The construction of the two hoses is different and the temperature ratings also vary.

Please read this PDF for actual specs of common hoses... Important Safety Information

I though I would point this out because so many people aren't aware what the difference is!

Michael Connors

Suggested Thread Sealer

Just a quick one - in your article Plumbing Basics, Part 1 you mention Teflon tape as a sealant for threaded fittings. While Teflon is good, I much prefer Loctite 569 – put just a drop or two of this on any fitting before you screw it in. I've never had anything leak after using this stuff and it's much easier and quicker than Teflon. It is a bit expensive to buy, but a bottle will last you literally years. Hope this is useful to someone out there!

Michael Sheehan

Kilogram Confusion

In Driving Emotion it says...

"(Note that if a new exhaust hadn’t been installed at the same time as the turbo, the turbo conversion would have worked out lighter.)"

It seems that someone looked at the wrong figure here, as the turbo and exhaust added 10kg to the car, the new exhaust weighed 15kg but the old exhaust weighed 11kg... So, just after telling us we must take into account the weight removed, Julian has made the same error! If the exhaust had not been changed, the turbo mod still would have cost an extra 6kg. Immaterial still, but significant to the article! (I think... if there's something I’ve missed, please let me know!)

Kent Slaughter

That statement was made in comparison to the supercharger installation – ie if the new high-flow exhaust hadn’t been added, the turbo kit would’ve been lighter than the supercharger installation. The complete turbo and exhaust installation weighs 10kg more than the standard car.

Closed Loop Mixture Details

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I purchased "Altering Closed Loop Mixtures" (Altering Closed Loop Mixtures) because this means that the goal is to alter closed loop mixtures. I would like to do this as it would allow a lean cruise mode. However, in the article, this was not accomplished. Disconnecting the O2 sensor under load and then tweaking the mixture is totally different.

You now have a series, starting at Modifying Closed Loop Cars that Need LOTS More Fuel! Part 1. I don't want to buy these articles if you did not accomplish modifying the closed loop behaviour. I think the first article I purchased had a misleading title and I wasted my money because of this. I don't want to do it again. I am very impressed with your publication overall. I may eventually subscribe.


If you use the techniques outlined in either article and then reduce fuel pressure, or increase the airflow meter signal, you will be able to attain a lean cruise mode that can be switched in and out.

Golf Cart Power-Up!

I am looking for a two or three cylinder diesel engine to power a small car (which weighs 1200lb or about 545kg). I also need a compatible transmission. Do you have any suggestions? In case you are wondering, I want to convert a street-legal oversized electric golf cart to diesel.

Joseph Lyman

The latest engine that springs to mind is the three cylinder 800cc direct-injection engine from the smart – its 30kW and associated gearbox should get your cart moving! There have also been some 3-cylinder turbo diesel engines produced by Daihatsu (for the Japanese market). Can any readers offer some more suggestions?

Hidden Conservatory?

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I was reading the current AVO TT LS1 ute article LS1 TT Ute and was wondering what a "boost pressure conservatory" is? I was thinking it was a large glass building where genetically modified, high protein BOOST plants grow? How does the guy fit the conservatory onto his ute anyway?

Richard Laxton

Article now corrected – substitute "conservatively" for "conservatory" ...

Electric Water Pump Issues?

I've seen your comments about the Davies Craig electric water pump Testing the Davies Craig Electric Water Pump - Part 1 but I don't know what your issues are with them. It might have been a reliability issue which is now fixed for instance. I'm not sure what to make of it all?

Des Hammill

R34 Go-Go-Go

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Please do a review on modifying a Nissan R34 GT-T!!!

Chris Barry

For a couple of modified R34 RB25DETs see Sony Sound Skyline and Ripper R34

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