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Some of this week's Letters to AutoSpeed

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Cross 8 Feedback

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I read Michael Knowling's article about the Holden Crewman Cross 8 (Holden Crewman Cross 8 Test) and enjoyed it. I saw that the test vehicle Michael drove had a clunk from the front-end and another intermittent clunk from the driveline. I was wondering if GMH might have told you what they were, as I have a HSV Cross 8 with exactly the same noises (which my Holden service team haven't heard before and can't reproduce).

Also, I thought Michael must have driven fairly conservatively as his petrol consumption was fairly good compared with my 20 litres per 100km using premium unleaded.

Greg Hedditch

No, we don’t know the cause of the clunks – but it seems our test car didn’t have a one-off problem... As quoted in the article, we recorded 19 litres per 100km in city/urban conditions – pretty similar to your claimed fuel consumption.

Using DFA on MAP

I have an AE92 Toyota Corolla with an AE111 20-valve 4A-GE which uses a MAP sensor. I recently bought a Digital Fuel Adjuster (DFA) with the hope of altering the air-fuel ratio. I hooked it up to the MAP sensor signal - it sits on load point 48 at idle and maxes out at load point 93 (getting there quite early in the rev range). Now I need to know is there anyone in Brisbane who has experience with the Digital Fuel Adjuster and maybe able to help me.

Shane Bromage

Those load points make sense. Because your car’s engine is MAP sensed, it will reach its maximum load input as soon as full throttle is used - almost regardless of rpm. If you’re not confident tuning the DFA we suggest visiting ChipTorque. But be aware that the DFA is not ideally suited to MAP sensed engines. To understand the reason for this, see The Fueltronics AMFC

Big Turbo for Little Engine

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I recently purchased a 1984 G11 Daihatsu Charade Turbo. I did a quick search on the web, found your article (Daihatsu Charade Turbo) and noticed the fact that Michael Knowling once owned one. I bought my Charade with a few problems and have fixed most of them so far. It now has a 2 ¼ inch exhaust, bleed valve (unknown boost at this point), blow-off valve and air filter. I have read “Pocket Performer” (Response) and will upgrade the secondary jets in the carb.

My question is concerning turbo upgrades - I have found no reference to this anywhere. A while ago I bought a single R32 Skyline GT-R turbo and was wondering whether it would be suitable for this car? I found a compressor map for a R33 GT-R N1 turbo and was doing a few calcs to determine whether it would suit my purpose - it seems it is a bit too big, so I think the turbo I have may be perfect. What do you think? Also, I understand my R32 GT-R turbo has a ceramic turbine wheel and is good for about 150kW - is this correct? I also read Mighty Midget and Ian Richards used a modified T2 turbo. Would this be a better match?

BTW – I love the mag. I just got all the archives and two years subscription and can’t wait to try out all your turbo tricks!

Chris King

The R32 GT-R turbo will probably be a bit laggy. A Nissan ET/EXA T2 would be better suited, as would a Charade GTti or early Starlet turbocharger. You can also use one of the Toyota 1G-GTE six-cylinder turbos (which come in a twin configuration). All of these are suitably sized upgrades for street use.

Hyper Hybrid

Julian Edgar, I’ve seen all the awesome projects you have been working on but you haven't been telling us what difference it made to the performance and drivability of your car. Please - tell us how it goes!

Matt King

The supercharged Prius? A full series on that car – including performance quantification - has recently started at Technokill: Building a Blown Hybrid, Part 1

VL into VL-T

I have purchased a 1988 Holden VL Commodore manual. I want to know what the pin-outs of the ECU are so I can use data from the sensor wires. Do you have a wiring diagram for the Bosch ECU? Also, I was also looking at installing a turbo - what’s the best way I should go about this?


A Gregory’s service and repair manual will give you the wire colours from the ECU. With this information, you should be able to identify particular wires using a multimeter. Alternatively we suggest contacting your local Holden service department for a look at the factory pin-out diagram. For the turbo system we suggest a stock VL-T exhaust manifold with a suitably sized T3-style turbo to meet your power requirement. Low compression pistons are advisable and you’ll need to increase fuel flow and alter ignition timing.

Supercharged Silvia?

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Just an approximate answer or a general idea would be fine here... I was told that if I throw a supercharger (twin screw) into my Nissan Silvia it would use a lot more fuel than a stock naturally aspirated or turbo Silvia. This is apparently because it is constantly running max boost. How much more fuel do you think it will use? If I currently use AUD$30 fuel a week, would this increase to about AUD$40 or AUD$50?

Any help would be greatly appreciated. You're doing a great job with the mag - keep it up.

Steve Brown

The supercharger won’t always be pumping boost but it is likely that fuel consumption will be higher than the factory turbo version of the Silvia. If you’re currently averaging AUD$30 a week, consumption might increase to around $35 - 40 – depending how often you use that extra power!

Fan for the Intercooler

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I read about fan cooling for intercoolers (Fan-Forcing Your Intercooler, Part 1) and drive a Rexton 270XDI. Would fan cooling be a good option for me? The car has a tuned chip and is used a lot in slow traffic. Can I buy the fan over here (in Holland ) or can you send it over?


AutoSpeed does not sell intercooler fans. We suggest that you look through local car/motorcycle wrecking yards to find a fan to suit.

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