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Brian, The drive strategy for the Craig pumps is explained in an instruction sheet on their website. Depending on the difference between measured water temperature and setpoint, it toggles between on and off at 6V with various duty cycles or it ramps up to system voltage. 140Airpower, As I did...

Perhaps this contains the information that you are after: Luftabscheidung aus Kühlkreisläufen von Fahrzeugmotoren (Rüger, F) - Automobiltechnische Zeitschrift volume 73 (1971) There's one on Amazon.de but not cheap :( When we all think alike, no one thinks very much. ---Walter Lippmann

Pat, For its pumps Davies Craig recommends a controller. It seems to feed the pump with a combination of pulsed and proportional driving, dependent on the operating point. They have a very good reputation in the tuning world. I would expect nothing less than this stuff to work when fitted as per...

It begun when a friend started talking about replacing the stock water pump by an electrical aftermarket pump on his CA18DET engine. One of the elements in the manufacturers installation guidelines struck me: remove the thermostat. This brought me to think about what happens inside this liquid...

My feeling is that air will rather migrate being mixed with the coolant flow and will separate after engine shut-off, possibly getting trapped in some highest points. How easily it will bleed away through some clever placed passages or how easily it will get flushed away when coolant flow...

This is somewhat as a follow-up on the threads about Supercharger bypass valve operation. In my current set-up I'm not using the bypass valve any more. The charger is downstream of the throttle valve so there is no necessity for a bypass. The famous valve is still installed and operatable and I...

It does not at all feel a poor throttle response but I definitely need to measure pressure build up in the inlet plenum to support this statement. I did pay much attention to the volume of the system downstream of the charger. The total of intercooler and ducts adds only about 8 liter to the...

thread71-233418 I just noticed my previous thread beeing closed. The experiment is definitely a slow process [pipe] Here is some updat about this toppic. I installed a Lysholm LYS1200 supercharger instead of the Eaton M45. The crankshaft pulley I had before was of no use any more because...

Hi Mark, Glad to hear about the progress of your project. PID parameters can be calculated but often this gives useful results only when there is only few external parameters of external influence, which oviously is not the case here. Time for some trial-and-error engineering and probably being...

Dear all, Yes, this project is still alive. It is somewhat on hold because of a pending house refurbishment but in my head it goes on :) There is no means to adjust this valve mechanically. You can see the valve on a picture posted Januari 11 2010. Mark, it worked for me. It should be...

Hi Frank, The circuit is built in a plastic box laying on the floor at the passengers side. It's connected to the valve with a shielded cable and powered from a plug I installed for that purpose. The resistors P1 and P2 are 10-turn Bourns potmeters with a dial knob on the front of the box...

Hi Frank, To be honest if you don't have enough information with a schematic, I don't think you should try to build the circuit. Another engine will have a different behaviour and might need tweaking of some components values. Also you will be using a different MAP sensor and who knows is the...

Here's a brief report of the tests carried out lately. There is no noticeable rise in charge temperature when the bypass valve is on its way between open and closed. I feared that this would have been the case for the short time the system is operating on the slope part of the boost graphs...

Hi Bob, If the DTA ECU has a configurable analog output then it sure can drive the DRV101 input. In that case it might even be possible to incorporate a RPM component in the process. The point along the TPS axis where the valve starts reacting could be different for low or high RPM...

Hi Bob, I'm not sure I understand your question and the reason why you want to modify. Do you want to convert the valve actuator to a diaphragm one or do you want to modify the electronic drive so it takes into account the MAP signal and not only the TPS? Regards, Jean Train dogs, Teach people.

and the other attachment Train dogs, Teach people.http://files.engineering.com/getfile.aspx?folder=7b96c298-8a9c-4227-93cb-03dfbad7729d&file=TPS.pdf

Hi Mark, I attached the schematics in pdf format. TPS.pdf is the one I first used for controlling the valve. Although the positioning was very clear and reproducable, this was not the good way to go in terms of drivability. On the drawing I replaced the TPS by a 1Kohm pot on the bench and...

Hi Mark, Thanks for the pictures, indeed the chargers are similar. As for the potmeters, R1 and R2 are 270? and the pots themselves are 1k?. The reason why there are two pots is most probably for redundancy. I'll draw a sketch of the circuits used. I'll do this when I'm back home end of April...

Mark, Making this work with a Megasquirt is a nice project. I've been looking at the Megasquirt ECU at its very beginning but I didn't follow it up. It seems to have very useful features like PWM outputs as you mentioned. I don't know what is the power capability of these outputs. In my setup...

Pokeytemplar, This project has been on hold for a while because of other priorities and I don't expect it to restart in next couple of weeks... During summer I had the car for a series of laps on the track and I'm glad that it all held together :-) For increasing the boost I am hesitating to...