waxen
-
Posts
13 -
Joined
-
Last visited
Content Type
Profiles
Forums
Events
Gallery
Blogs
Posts posted by waxen
-
-
Well it's been a long time since I've been playing with my Megasquirt setup. I have had the Bosch idle valve disconnected because I cannot get it to work properly, so after a few months or so of fiddling and resorting to Niges original settings I tried today to get it working on warmup............Success well for a short time, it all went pear shaped after I tried to adjust the air bleed screw on the valve to trim the idle down about 50 or so RPM. As the screw was adjusted the idle jumped up to 13-14 hundred RPM, the same result I had been getting all along.
So... what I think I have discovered is that the valve is unable or not strong enough to stay closed against the engines vacuum demand. A few things that might be at play here, i suspect are: Faulty valve? A need to readjust the throttle body or something screwy going on at the electronics end. I have tried various pulse widths with the valve in my hand and watched the idle dc gauge in Megatune and it has remained stable.
Does anyone have any ideas or similar experiences?
-
Not being an expert on the P76 4.4 litre engine, but would the 3.5/3.9l inlet manifold even fit? Seems to me you would struggle, as taller deck height = wider V-shape?
*actually, just checked in David Hardcastle's book, you'll need to make up spacers to fit the EFI manifold....
The spacer plates are available over here, it's a pretty common modification...........Speaking of which I have a spare unused set<_<
-
Hi All,
I have been following this Megasquirt stuff on here for a while. I have bit the bullet and started putting together my own kit that I bought second hand off a mate of mine. It is a V3 PCB with a Megasquirt 1 CPU in it. I am soldering up the board and so far have soldered on the resisters, the CPU socket and the DC37 and DB9 plugs. I have been following the instructions on this site http://www.msextra.c...uild_manual.htm
My truck is a bit of a beast being a 1984 110 Cab Chassis with a 7 foot steel tray on the back. It has the Australian P76 engine in her which is a 4.4 litre rover motor (taller deck height). I plan to fit EDIS ignition using the Megasquirt to control it and later on fit a Rover 3.5 or 3.9 EFI intake manifold. I think I am going to cut off the throttle body off the rover manifold and TIG weld a mounting plate to attach a Ford Falcon (Aussie car 4.0 litre inline 6 cylinder) throttle body. I also intend to drill out the injector bosses in the manifold to also fit Ford Falcon injectors (much cheaper in Australia than LR ones).
I also am going to run LPG on this beast from my 160 litre cylinder I have for her.
I noticed in my kit I am missing the diodes and was wondering which supplier would be the best to talk to about getting some more. Also I wish to know if anyone has setup the switchable ignition maps using the modification listed here http://www.msextra.c...l.htm#mapswitch
Also is there any bit difference between the two manifolds on the EFI rover v8 motors, the 3.5 ones and the 3.9 ones?
Cheers
Rich
Hi Richard,
I set up the active high input version of the switchable maps, Works well. The reason I chose it over the simpler one is that it offers a bit more circuit protection.
IIRC the Magna injectors fit into the rover manifold.............regarding differences between the 3.5 and 3.9 I think they are pretty much the same, I thought they were different but it is the injector mount plates and fuel rail that are different.
Try RS components or Jaycar for the Diodes
-
39 pages of info, some of which is relevant, some of which is'nt. Like looking for a needle in an SU graveyard!
The donor vehicle is not here, so I can't have a look very easily.
did'nt see see a base map, will have another look!
This might help Mega Index
-
Righty oh,
Here's a problem I found myself with, following a full rebuild, I have got a Kpa up at 70/80 on tickover, 800 rpm'ish which means with the old map it's throwing fuel in.
Same cam etc just re honed, reringed (although less than 1000miles since rebore, heads skimmed and recut etc, reground crank usuall stuff but nomajor changes.
OK I thought do a day in it and it will come back down, absolutely no time for re-mapping (which has to be done off-road),
so a full 7 hour Challenge took place, it run faultlessly but without any silly rev's used a full 70 litres of fuel on a very small site,it was difficult because it was sowet and cold totellabout smoke etc but all seememd well.
Tried the other day now running like a bag of nails and extremely rich and chuggy, laptop on and still up there at 70 or 80Kpa cold, plugs black and wet with fuel.
Question is, if I doctor the fuel map to compensate for the high Kpa I will have a very limited range, so to speak, how long should I expect the high Kpa, is it normal and expected, all other paramaters, settings, readings, temps etc look good to me.
So all i did was to reduce fuelling on the higher Kpa's to weaken it, but that also causes me concerns.
What do you think boys.
Chris
Sounds like a Manifold leak, Your idle MAP should be somewhere between 30-40kpa. A kpa of 80 or so is like a wide open throttle. An easy way to test it is to disconnect the vacuum line to Megasquirt and see if it is running the same or similar.
-
First many thanks to HFH, FF and BBC for such an inspirational thread - I'm about to squirt/EDIS my Disco and can only blame thank you guys for giving me the confidence.
Now, to my very simple question - there seem to be many members who have squirted a serpentine lump - where did you put the coil packs and how did you mount them? Can I have some pics please? The build was going to start next weekend but I cooked the engine yesterday
so it's coming out for a rebuild and whilst it's out the vr and trigger wheel can be placed without scraping more skin off my knuckles 
I mounted the Coil packs behind the Plenum on the Firewall with the connectors facing down. The idea was to reduce the possibility of water getting in. This turned out to be a not so bright idea as the leads now dont have enough room to interlock with each other.
Here a couple of early in progress shots, mines a Range Rover but the Discoverys have more room behing the engine for the Coil packs
-
Thanks, Nige & Fridge,
When I get Megatune running on this computer I'll work out how to do a screen dump and post. The issue is not that big a deal as it works fine after about 10 -20 seconds.
The whole PWM thing has been a bit of a nightmare because I built my own board, I followed the directions (or so I thought) in the MSextra manual for the flyback diode. 3 TIP 122's and 2 Diodes later it works. The pictures in the manual show the diode connected to S12 NOT S12C as it is written. that little issue had all sorts of ramifications. In the end the Flyback diode is now at the valve, works heaps better.
-
Bobtail84, I will be interested to hear if the change of transister makes the PWM valve behave any differently. Whether it is coincidence or not........I had to change my settings a fair bit to get the valve to behave the same way, and while I was playing discovered the flyback diode was faulty as well. This brings me to a new query, it doesn't seem to matter what PWM idle settings I dial in I can't seem to get it to hold the idle immediately after a cold start unless the throttle is coaxed initially. I was wondering if it was because the warm up enrichment isn't rich enough to begin with. Mind I have been using some of the settings found on this thread, which would appear to be suited to a colder climate from where I am.
Cheers
Wayne
-
Sounds like the Flyback Diode or Tip 122 is faulty, I had a similar problem and it was the Tip122
-
And I should have said Ignition only!!
Cheers
Rich
Richard I would think that the Megasquirt would have to be built with fueling in mind to get it to work properly. That being said I run my setup with dual fuel, the Megasquirt controls EDIS via dual mapping and an empty fuel table. I simply have the power feed to the injectors interrupted by a relay when on LPG.
You would need to hook up a MAP sensor regardless and the O2 sensor is handy for tuning.
Cheers
Wayne
-
Wayne,
I have a MegaSquirt to hotwire diagram for you that I will dig out.
Thanks that would be very much appreciated.
I also have LPG maps but I think you are a long way of before you need those. I'm always playing with my MS so when the time comes I will ping you what you need.
jeff
Yes you are absolutely right there. Om a bright note my box of goodies arrived from DIY yesterday............my first reaction was OMG what have I got myself into
, now that everything is here. Question, the ms squirt n spark extra manual often suggests different circuits for the same modification i:e Fan control, what are the pro's and cons of these?
As I understand it the mods I need are PWM driver, dual tables? and fan control. Does that sound about right?
-
Hi all,
First post. First off compliments to you HFH on a first class thread, have read and reread it and I still haven't absorbed it all.
After a couple of years procrastinating about Megasquirt, finally I bit the bullet and have bought it 
, the decision was helped along by my engines death 
and this thread.The project begins with a 3.9 Serpentine, EDIS8 system from the US and MS1, the idea is to go with the recommendations found here. So first question (I've searched with no success)is there a wiring schematic for grafting the Hotwire loom onto Megasquirt? Or am I better off adapting a Flapper loom? Bear in mind that this is going into a 1976 2 door.
Second question, Has anybody got an idea of spark maps for LPG as this project is dual fueled?
So far the project has been about procurement and modifying some engine ancillaries to fit on the serpentine motor. Then it will be fuel tank and lines from a Disco (gives me a great reason for a body lift, they are a swine to remove and refit) and when the goodies arrive set to a bit of electronic assembly. Any tips?
Hopefully this is in the right area and I will update as progress is made.
Cheers
Wayne
so it's coming out for a rebuild and whilst it's out the vr and trigger wheel can be placed without scraping more skin off my knuckles 
, now that everything is here. 
, the decision was helped along by my engines death 
and this thread.
Bosch PWM idle valve
in MS-Megasquirt/Jolt
Posted
The adjustment line of thought makes sense now that I think about it......It does seem that the valve is not capable of withstanding the full vacuum signal, it is after all there as an air adder to increase the idle not decrease it...........'tis clearer now after discussion:rolleyes:
Thanks