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PreMods - P5-Air
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BEFORE ANY TURBO MODS

CONTENTS
Iconbefore.gif (4193 bytes)
To MODIFY or NOT
DETONATION
Pre-ignition & Fuel
Fuel Volume & Pressure
Air Supply
Exhaust & Heat
Lubrication
Cooling & Water
Breathing
Boost
Modification Sequence
Conclusions
BEFORE Turbo Modifications - Page 5        Next Page;- Exhaust & Heat

AIR SUPPLY

BEFORE & AFTER TURBO FUEL / AIR mixture is critical, and your air supply is as important as fuel, and can be vastly improved to not only make power, but be more fuel efficient in most cases. Most factory intake set-ups can be improved to some degree dependent on your ingenuity and skills.
The most effective immediate change is to a Foam Type FINER Filter or similar that uses washable foam element with a very sticky special liquid that traps dirt etc but allows high clean air flow. Another effective trick is to get cold outside air to the air box, as under bonnet air can be 50 degrees hotter after coming through the radiator and intercooler if fitted, as well as the heat generated by the turbo. All pipes and hoses should be as large a diameter as possible with smooth bends and interior surfaces going as direct or short path as allows. AIR TEMPERATURES.
The cooler the air when it enters the combustion chamber the better. Ever noticed how well your turbo goes on cool crisp evenings? This is the job of the must vaunted INTERCOOLER. This much misunderstood item acts just like your radiator does to hot engine water that has done its job of cooling the combustion process on its way circulating in your motor and possibly water cooled turbo.
Simply, hot compressed air from your turbo is routed through the INTERCOOLER (usually mounted in front of the radiator in the oncoming air stream to benefit from maximum cooling effect from the air forced through.) As the boost air flows through the INTERCOOLER it looses its heat to the cool alloy of the core as it passes through on its way to the throttle and intake to the cylinders probably 50 - 70 degrees Celsius cooler than when it exited the turbo compressor.
Detonation is once again defeated by this cool and denser packed mixture that allows more power on ignition. Another trick is to fit what most factory turbo cars now have, the TURBO BY-PASS VALVE. This valve is operated by manifold vacuum and opens to allow boost pressure that has built up on acceleration to be recirculated when the throttle is closed between gear changes. This valve allows the air to return back into the intake to the turbo for recirculating so the blades of the turbo are not stalled when the throttle is closed and the air in the intake pipes keeps moving instead of stopping momentary.

Detonation is to be avoided at any cost.

Warning, the All TURBO CLUB Register makes this information available to you with NO express guarantee's implied or otherwise on the suitability of the information being relevent to your Automobile Make or Model. You should not make any modifications to your Automobile unless a qualified Mechanic has approved and checked that the vehicle is safe and roadworthy and meets all relevent State Governed Regulations before proceeding onto public roads. The information contained in this ATCR Website is believed to be correct but the Author and Publisher make no warranties, express or implied that the information is free of errors, or that it will meet the particular requirements of individual Automotive application.

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PreMods - P5-Air

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