Date: Mon, 05 Oct 1998 19:01:25 +0100 From: johnnopsam16.co.uk (John) Subject: Re: Allowable boost 85 900T
In article <19981003162833.14579.00005844nopsama2.aol.com>, baur323nopsamcom (Baur323) wrote: Dear Ray, In Europe our 900 8v's are set to 10lbs manifold pressure as standard and the 16v's are 12.5. so you should be safe within these limits. Adjust the (p) pot on the APC box and or the control arm (shorter for more boost) on the turbo. Ultimately your boost is limited by the Knock resistance of your engine which is determined by the intake charge temp (bigger intercooler / water injection) and or lower compression ratio ( pre APC pistons) . I have to agree with Justin your car being of highish milage any increase in boost past the above can only bring about an early death of the box or the engine. I have found that the more boost you dial in does not actualy give a better performance on a stock engine and inlet it goes like this - yes on a cold day the boost climbs right up to where ever you want it (within limits) this gives a good kick in initial acceleration but this causes the cylinder temperatures to rise very rapidly thus causing knock and the intervention of the APC reducing the pressure to basic - you will certainly notice this as an abrupt drop in power after a few moments the boost will climb again and come back down and so on - not a very satisfying driving experience. If you are into too much boost the over boost swich comes in cutting the fuel pump even more annoying. The thing to do is to increase the boost setting gradually to the point where in all but the most demanding conditions (up hill on a hot day) it will hold the boost without cutting back. John
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