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Overheating because the coolant rad gets prewarmed air that has gone through the FMIC?

How is the FMIC plumbed with the twin turbos (presumably you are removing the SMICs and taking the combined charge from both turbos before intercooling it or is the FMIC dual entry? What happens to pipe lengths and coolant temperatures?

Diesel, my wife has a new job, and is going to opt out of the company scheme I think, depending on what the fuel rate is per mile we'll then decide. She may also keep on another car which could be an S4 if she gets a boring diesel. I'm sure I'll get an Audi with a turbo at some point. I like them a ...

Thanks Chris. It does sound like it is just the part throttle boost that is the problem then. The throttle position sensor aware electronic boost controllers would fare better here I think. Dippy, I sounds like they are also upgrading the injectors +- fuel pump, and also probably checking and retard...

Thanks, I see and understand now :) Is the MBC part throttle jerky because: 1.Ball spring MBCs are that way anyway? or 2.The ECU sees more torque than it requested on part throttle and fights it? If it is just 1 then an EBC could be quite nice to drive, albeit losing safety functions as noted. I sup...

Reading a bit more it looks like the N75 is just like a 3 port solenoid with a PWM from the ECU. If using an MBC in parallel it looks to me like it would only control spiking but not raise the boost level. Using a MAP voltage clamp at say 12 PSI would stop the ECU seeing higher than 12 PSI so you ca...

Appears to be quite a stout engine, why do you think I'm interested ;) ? You're thinking about it too? Main appeal to me is the understated refinement and ride quality. However, I thought the vertical body control of a stock RS4 I tried down roads I know really well was rather suspect - quite a fres...

Thanks.

Thanks again. A lot of food for thought.

Scotland Nice and cold for charge temperatures

I like those K16 hybrids BTW

Sorry, another thing, those fuel pressures are quite high, are the S4/RS4 regulators running fuel pressure relative to manifold pressure, or are they fixed at the noted pressure all the time? Just that 5 bar plus say 1.6 bar gives 6.6 bar fuel pressure? A bit higher than I'm used to on the Jap crap.

Verrückt, any links to the nitty gritty of all this on an S4 would be most interesting and welcomed! I am perusing your website presently Thanks.

When you adjust the MAF cross sectional area and the injector flow up by the same proportion on a typical Japanese ECU, all is fine with the fuelling, but you have a problem because you just advanced the ignition timing as the ECU sees lower load for the same boost pressure as before. I have a worka...

I'll be in touch then if I get one so I can get it done properly