How are you going to make/intergrate a common vacuum signal for your FPR ?
Are you going to use an ICV ?
What adjustment have you got for balancing the throttle with each other ?
Excuse my ignorance but how does the brake servo work on a turbo car ? Some sort of accumilator/one way valve type thing ?
Not bothering with the vacuum signal to the FPR, as long as the ECU knows about it, they can be left disconnected so that one's pretty easy
Not using an ICV on this one, the idle's to be set just by cracking the throttles open a fraction. After that, idle stabilisation's taken care of by the ECU which ramps up the ignition advance if it sees the idle speed dropping. This has the effect of giving the engine a real kick up the arse so it doesn't stall.
The as you say, there's a one way valve installed in the line to the servo. Lots of N/A cars have the one way valve too to prevent any oily gasses finding their way to the servo and perishing the diaphragm. As Karan says, servos kind of accumulate their own vacuum supply and do this mostly with the throttle shut when there's lots and lots of vacuum to be had.
TurboBrown - must be a PPC reader??? In fact, is that your letter in there this month?
As you seem to be up on induction etc, what's all this we keep seeing about using bike carbs or bike throttle bodies. What sort of hasssle would I be into doing this on my M20?
I am indeed a PPC reader, and it is my letter this month
didn't expect to see that published!
Think the bike carb / TB thing is just a cheap way of making a TB setup on a low budget
In terms of hassle, all you really need to do is find some way of mounting them on the engine, and them mounting the injectors and fuel rail to them. Lots of people seem to cut the standard manifold down and then attach the TBs to that with lengths of rubber tube.
Someone posted some piccies of just such a setup on an M20 not long ago, only problem I could see with it was that cyl No. 6's TB was practically blocked by the servo
Other than that, you need something to control it so an aftermarket ECU's probably on the cards.
Think if you could make a decent TB setup and use the Megasquirt, you'd have made some nice cheap power, and gained pretty electric throttle response into the bargain
top man, what turbos are u gonna use? and what power are u plannin on fella?