trendy tramp

Icegeezer - top bloke, parts as described and even held parts aside for me whilst i was away. Cheers mate! tt

cheers - he sold the car last night anyway 8) tt

My mates warning light is permanently flashing on, but his coolant level and temps are fine. Told him to check the connections to the sensor on the header tank but no joy. Any quick pointers before I have a look? Cheers, tt

found this New Corrado News looks like the Concept R ha been further developed but still has not been signed-off tt

let's not forget PhatVR6's R32 powered Corrado 8) tt

turbo + supercharge - pah! it'll never catch on :lol: tt

a few things to add: you should specify ADIABATIC efficiency in terms of efficiency - a perfect adiabatic system is one which can change pressure without a corresponding increase in temperature. teh efficiency is dependant upon the incident angle of the incoming air to the angle of the cmpressor blades which changes with speed. the ovals you refer to are more commonly called efficiency islands teh surge line is only approximate - most manufacturers are slightly optimistic of the surge characteristics of their compressors - some worse than others (naming no names :wink: ). when the constant speed line starts to decrease as you move left from peak efficiency is the true start of surge. so you may be in surge sometimes without realising it. there are different types of surge. surge below a PR of about 2 is known as light surge and most OEMs will actually calibrate to move along the surge line, sometimes to the left of it as it is not damaging. moving further left or upwards or PR 2 will cause heavy surging which can damage the compressor wheel as supersonic pressure waves oscillate within the compressor wheel blades and splitter blades as it spins and flow breaks down. The ability to recover from surge is affected by the volume of the pre-compressor ducting - larger volume = longer surge period. surge is actually a cyclic process and the compressor will go in and out of surge several times a second - hence the associated noise. although you may be measuring a mean PR and mass flow well within the non-surge region of the map, the compressor's locus of operation could actually be dipping into and out of surge. most importantly, maps are gas stand tested and do not include the vehicle level intake pre/post compressor. The pre/post compressor geometrics can and will move the operating map away from it's measured map - 99% of the time for the worse. Usually the PR will reduce and/or the mass flow capability wil reduce - basically the map is squashed and hence performance is reduced. and let's not forget axial swirl into the compressor which can have the same effect or have a beneficial effect - depending upon the direction of the swirl and the compressor wheel design. the bottom left of the compressor map can also be extrapolated as this region can be entered under harsh tip-in (accel). the constant speed lines can also be extrapolated to PR=1 to determine the choke characteristics of the compressor. that's the basics on compressors - now how about turbines and matching :lol: tt

yep - defo exhaust mate - mine was the same recently tt

nice one mate 8) tt

well the missus is definitely getting a C after Xmas - all very good except she'll want me to rebuild the engine, fix this, fix that etc. :( tt

:lol: the C's gotta be more reliable than the Spunto though :roll: tt

you may think a bad move.... but after 2 days she now wants to sell the Punto and buy a C 8) :D she's looking to buy after xmas now - that could throw me a lifeline to do work on my cars now :twisted: tt

yeah rob blew it up showing off to ell's horny assistant !! :lol: :lol:[/quote:a8b8a] LOL :lol: tt

i can vouch for that :) and then there's mine - it pi55ed it down at brunters every time i went out and it gripped and gripped and gripped. that's in a car where we've purposely moved weight from the front to the centre of the car to assist cornering. and it never had any tractions problems at all - and that's also with a std diff! Just a very stiff shell, no rubber, lowered engine and careful setting of the geometry tt

still can't picture you mate :oops: terrible memory for people like that :roll: maybe i've supressed the memory to protect myself - must have been a terribly messy image :lol: tt