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Some of this week's Letters to AutoSpeed!

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Get Your Mitts On These

Insulating the Return... Clark Rubber in Melbourne (Greens Rd in Dandenong) has a Neoprene type material that is about 5mm thick and is perfect for the type of insulation you have covered in the recent article. The piece is about 1.4 metres high and a 1 metre in length. Cost is AUD$83 and there is more than enough to do two cars - I'm doing this with another owner to cut the cost in half.

Russel Isaaks

Big Thanks

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You recently published an article entitled Coffee Kick on a Suzuki Cappuccino. As the owner of the car I would just like to thank you for the opportunity to get my car onto your website so that people could appreciate the time and work that has gone into the development and build-up of the little rocket. I'm also grateful for the fact that the actual article was written without mentioning any corny coffee puns or that it is a very small car - a fact that I'm well aware of... So, in closing, thank you to AutoSpeed.

Dave Mochnik

Glad you liked the story! We always enjoy writing about truly different cars that their owners obviously love.

Blow-Through 'Cooler?

A question... I am part of restoring a classic rally car - a Mustang 2.3-litre Turbo SVO Coupe with a blow-through set-up. We are fitting a new turbo and having new manifolds made and we're wondering whether intercooling would be helpful or not? We have been told by all and sundry in the car club that unless it's fuel injected we're wasting time and money trying to intercool a blow-through carby set-up. What's the verdict from people who really know - AutoSpeed?

Scott Bell

An intercooler will potentially increase both power and avoid detonation. In a blow-through installation the 'cooler can be installed between the turbo and the carby - just like it's mounted before the throttle(s) in an injected turbo engine. We've fitted an intercooler to a blow-through Daihatsu Charade turbo and enjoyed great results. Don't hang back - just make sure the intercooler has adequate charge-air flow and reasonable heat-exchange performance.

Compatible Squirter

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Re the injector flow chart on your website Injector Flows The injector listed as Denso 315cc light green also fits October '93 onwards Toyota 3S-GE.

Terry O'Beirne

How Long?

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I'd like to thank all of the staff at AutoSpeed for continuing to provide the best value car magazine in the world! I have just been reading your Driving Emotion article published 2/11/03 I am confused about some of the details published from the Carrier air conditioning book. In the text you state that a mitred 90 degree bend in a 3" tube has a restriction equivalent of 4.6m of tubing, yet the chart below shows the equivalent as being 15m. Or is that supposed to be feet? Either way, that section of the article is unclear. I hope you can provide some clarification.

Adam Seedsman

At the beginning of the charts is the introduction "Losses in equivalent feet of straight pipe".

Not Over the Moon

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I am writing regarding the article comparing 25 intercoolers The World's Biggest Intercooler Comparison - Part One I was disappointed with it, as it did not explain the very important point of why 'coolers with similar size flowed so very differently. A good example would be the Mazda RX7 Series 6, Mazda Cosmo and Mazda GD. These were ranked 2nd, 3rd and 22nd in flow, but I count about 22, 19 rows and 27 rows of charge air ducts respectively. The latter GD intercooler - with the most charge-air rows - actually came 22nd in airflow. My flabber was ghasted! I am attempting to design my own intercooler for a Renault 5GT Turbo and am keen to get this flow business sorted.

One must not forget that the primary function is cooling and I would have been very interested to see the differences between the above mentioned 'coolers in that respect. But clearly there is something a little strange about the flow thing. So are larger fewer ducts better? Is it the way the end tanks are sized or the way the pipes join them? The best in this test hardly look the best!

Ian Simpson
United Kingdom

The reason we didn't explain the flow variations across intercoolers was largely tied to the fact that we were unable to see inside many of them. This meant we had no knowledge of the internal cooling fins and their density.

Cooling performance? Well, it's not practical to compare all the intercoolers on a car - and that's exactly what you need to do to ensure accuracy.

Go-Fast GTi-R

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I'm 16 years old, living in New Zealand and own a 1992 Nissan Pulsar GTi-R. I was searching the 'net for cheap Do-It-Yourself mods for a GTi-R when I came across your site. It is an awesome site, but I couldn't find much about mods for a GTi-R. Would you be able to write an article about GTi-R mods or could you e-mail me back with some easy mods to do to my near standard GTi-R.

John Carpenter
New Zealand

Specific to the GTi-R we have done a handling upgrade story, a 'buying used' feature and a feature car Suspension Intervention, Supercar Steal and Stealth Strike. Do a search of AutoSpeed tech articles under titles such as "air intake", "exhaust", "intercooling" and "boost" and you'll find heaps!

Which Way to Go?

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Timing or boost - which makes more power? I drive a 1996 Nissan 200SX with a 76mm exhaust and pod air filter. The only pump gas available at our high altitude is 93RON unleaded. I have increased the boost level to 0.8 Bar without any detonation. Which of the following would be best for a daily driver and drivability? Advance the ignition timing as far as possible without detonation, or increase boost as far as possible without detonation? I would prefer the car to have a bit more low-down grunt but would also like a little more top end power.

Gordon Pieterse
South Africa

If you're after a bit more low-down we suggest you advance the ignition timing as far as you can - this will certainly improve bottom-end. Visit DIY Detonation Detection - Part 1 and DIY Detonation Detector - Mk II to see how to make a detonation detector. This will let you see how far you can go with more timing and/or boost!

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