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Courtenaysport
To a large extent, the power and torque out put on any engine is dependent on the volume of air its capable of drawing in. Research shows that the standard GM throttle bodies fitted to most Vauxhall engines are undersized and act as a bottle-neck to the inlet charge, pegging back power and torque. To over come this we dismantle the throttle body and use a CNC lathe to enlarge the diameter of the unit, as well as installing a new, bigger throttle disc and low profile spindle to suit. Typically, this results in an increase in full throttle cross sectional area of between 10 and 20%. The result? Improved torque and power outputs usually in the order of 4 to 7 bhp, as well as superior throttle response and a sharper feel to the engine. All throttle body reworking is carried out on an exchange basis.

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Originally posted by topshot_2k
Fit N2O if you want to beat the 150bhp mark?

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Originally posted by Monster


The blue bit, thats the butterfly, he must make that bigger in order to flow more air though into the inlet.

[Edited on 18-04-2007 by Monster]

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Originally posted by topshot_2k

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Originally posted by Monster


The blue bit, thats the butterfly, he must make that bigger in order to flow more air though into the inlet.

[Edited on 18-04-2007 by Monster]

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that bar you see across the middle when the throttle is open thsi creates a 'wall' which air hits, they reduce the impact this has on air flow, TBH mate i wouldnt pay over £100 for opeing the throttle out etc

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Originally posted by 20valver
have tried three different sizes of throttle body and yes they make a difference

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