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wildmanben
06-20-2005, 12:49 PM
Well I guess I'll start things off in here. This August I'm going to be attempting a 600 mile trip in my MSnS'd car. Have any issues come up concerning long trips? Specifically, are things known to get too hot or fail on the MS board when running for a long time? I'm really interested in getting myself prepared for the worst. Would it be a good idea to stick a mushroom fan on the MS case?
Let's have this thread be open to things that break/fail on megasquirt with time. Thanks!
-Ben

kyle242gt
06-20-2005, 01:03 PM
Whoa, a new subforum.

You could always build an extra MS box, flash it, and be ready to go; much like some bozos recommend with GM HEI units :roll:

The one place I have experienced a few failures is with wiring in the engine bay. It'd be a smart idea to bring a bit of wire/solder/flux/iron/power inverter/bosch 2-pin plug (like injectors) JIC you need a roadside repair.

More importantly, it might be good to plan your trip through MS-friendly locales, in case you have to put up a distress call.

You might get a better cross-make set of responses at msefi.com ; for my 2c, I wouldn't sweat driving my MSnS here there and everywhere. Most days, I leave the laptop at home, and it doesn't even cross my mind that I have aftermarket EMS.

740ATL
06-20-2005, 01:04 PM
hey Ben, I'm under the impression that these things are designed to be run continuously... assuming they're not parked next to the heater core or next to the exhaust manifold.

but a 600 mile trip should be good for datalogging yes?

Mike

linuxman51
06-20-2005, 01:06 PM
if you have the laptop space for a big f-in log hahah

Hank Scorpio
06-20-2005, 01:39 PM
When I built mine I left it on 2-3 days straight. Worked fine.

When my 242 went XC it was left "on" for 7-8 days. The MS survived fine (attaboy kenny) but the hall sensor in the dizzy gave up for ghost. Im sure being powered w/out ever moving for that long did it in. Surprizingly the MSD and coil survived.

I wouldn't worry about it to much. I did a couple 3-400 mile (round trip) drives in my 242, all was fine.

the poi
06-20-2005, 01:52 PM
I drove about 300 miles in one day. Didn't have a single hiccup. Longest continuously I ever logged though.


And hey, new subforum.

The Aspirator
06-20-2005, 03:22 PM
Sweet new sub forum, this rocks.

Two weeks ago I did 1200 miles in three days, the only proplem I was having was a hot starting issue. Get the car good and hot, shut it off, then it won't start again for 10 minutes. Then it's fine. When I got home I changed my hot start cranking pulsewidths (richer I think) and the problem was GONE. I brought the laptop on the trip but didn't need it, though when I got home I realized that I didn't bring the serial cable or power inverter! Duhh.
So yeah, bring the laptop incase you need to do any tuning changes, and make sure your wiring is good. You shouldn't have any problems. Never has my MS really died on me or complained at all, it's been installed for over a year on my daily driver.

John

Matt Dupuis
06-20-2005, 04:33 PM
Never has MS failed me, in a way that wasn't due to my stupidity. Before I built the flyback circuit, I killed the early flyback mod and it left me walking. Now the thing's a rock. I've done thousands of miles in town and one bansai 700 mile run from Bellingham to Calgary. If I couldn't kill it on the floor for 10 minutes climbing the Coquihalla, I ain't gonna kill it ever. Most of youn's ain't using the PWM injector drivers, so that's one less thing to worry 'bout. Chicken****s.

Heat kills, so keeping it off your firewall is a good idea. Mine was mounted right on the firewall, right behind the downpipe, and it got hot but never died.

The Aspirator
06-20-2005, 04:42 PM
Right, my own stupidity has left me stranded a few times. Always easy to fix though.

My MS is mounted in my glovebox. It does get hot in there. I don't think the MS board itself really puts off alot of heat, if any, so you're just trying to keep the heat away from it. Mounting it in a more open place with airflow might make it last longer, in the long long long run.

ovlov760
06-20-2005, 07:11 PM
I've put a few 170 mile trips on the car since MS and not once has it or the wiring ever been a problem. Do MS boards get hot? I don't recall that mine has ever felt warm or hot.

ovlov760
06-20-2005, 07:12 PM
Right, my own stupidity has left me stranded a few times. Always easy to fix though.

My MS is mounted in my glovebox. It does get hot in there. I don't think the MS board itself really puts off alot of heat, if any, so you're just trying to keep the heat away from it. Mounting it in a more open place with airflow might make it last longer, in the long long long run.
what about cutting a small hole in the top and mounting a tiny PC fan?

pat244ti
06-20-2005, 09:50 PM
I was thinking about the fan idea, cause I recall Rob [volvorules] had his MS fail on him on the way to SE 3.0 and it is kind of worrying me because in a week or two right after I break in the new engine I gotta drive the 240 about 750 miles back to California and I want it to be trouble free [to save myself from trouble I'll be running with kjet ignition]

ovlov760
06-20-2005, 10:07 PM
I don't know what part of the board gets warmest. What's the best area to have a fan blowing on?

wildmanben
06-20-2005, 10:14 PM
I was thinking about the fan idea, cause I recall Rob [volvorules] had his MS fail on him on the way to SE 3.0
Yeah this is exatly what sparked my worrying. I doubt I'll have any issues and all of the above seems reassuring, but Rob's issues still worries me a bit.
In an attempt to keep things cool, I have it wired so that all injectors are wired to both banks, and it's set to alternating. I'm hoping that alternating banks like this would help keep things cool, but I really don't know enough about the inner workings of the MS to know if this would do any good or not. But hey, won't do any harm.
-Ben

The Aspirator
06-21-2005, 01:00 AM
I remember reading Rob's old thread on msefi a few weeks ago (through a search) and I don't think it was because the physical board got too hot, but more that just the injector drivers overheated for some reason. Possibly beacuse he was running the wrong resistors, or wrong settings in PWM, it was something like that I believe.

All in all, you'll be fine on your trip.

yozsi
06-21-2005, 01:44 AM
i drove to reno and back with no problems thats about 500 miles.

Volvorules
06-22-2005, 03:08 PM
The problem with my MS was caused by my crappy battery terminals...the positive one had contact issues, and there was a voltage spike in the car. For some reason it decided to ground through the injector driver. Cracked the chip, car would start and sort of run, but it was full rich (with CFIs) and couldn't be driven. Towed it down to Kenny and he fixed it in 30 minutes or so!

Definetely not a problem with the MS. Made the return trip from Alabama to DC in 12 hours, no problems with the MS at all.

blu92in99
06-22-2005, 03:47 PM
what about cutting a small hole in the top and mounting a tiny PC fan?Or a pair of them, if heat is an issue. One set to intake, one to exhaust. that'd keep a constant 'breath of fresh air' over the MS unit. Although you'd need to clean the dust & dirt out every couple months, just like on PC's. :lol:

But, I'm a MS newbie/nobody, so I'll just shut my mouth now. :oops:


-Justin

GTJordan
06-22-2005, 04:01 PM
Back in the day, I had had MS in the car for a week with very little tuning when me and my dad left for where he was living (12 hours away of open highway). We got there in 12 hours without any problem (1244km or somthing like that) Then 4 days later we drove back again with no problems. The long trip was actually nice because it allowed us to tune without having to stop at a light or turn around. Got 33mpg on that trip I think.

Jordan

The Aspirator
06-22-2005, 06:04 PM
The MS components don't get hot, or if they do you're supposed to change out certain resistors for higher ones, it's described really well in the MegaManual. But keeping it out of the sun is probably a good idea. I've got mine stuffed in a black aluminum case in the glovebox, in the summer time the case gets really hot but I've never had a problem.

Ohh and I thought I should mention, sometimes people (like Rob) have something break on the board and need to replace it, not a big deal, it happens. But I haven't touched my board since the day I soldered it together. Over a year with 15,000+ miles and still going strong!

John

oneflat83
06-24-2005, 01:57 AM
1400 mile round trip pass from AZ to Ca then back with MS. Lost the fuel pump transister at around 1300 miles. hot wired the fuel pump with a jumper wire. Still new to this so i have yet to understand what happened.

linuxman51
06-24-2005, 11:19 AM
1400 mile round trip pass from AZ to Ca then back with MS. Lost the fuel pump transister at around 1300 miles. hot wired the fuel pump with a jumper wire. Still new to this so i have yet to understand what happened.

either a faulty component or too much load on the circuit from the relay (when they disengauge they tend to spike voltage aboot)

kyle242gt
06-24-2005, 12:26 PM
yeah, you need a "choke diode" IIRC, across the pins of the relay, so when the relay coil de-energizes, it doesn't send that spike back to MS.

I had horrible stalling problems every time my MS-controlled efan kicked on until I put a 10c diode in there.

the poi
06-24-2005, 01:16 PM
I had horrible stalling problems every time my MS-controlled efan kicked on until I put a 10c diode in there.
heh. Aren't all the output circuits set up like that already? Or was this an output circuit with no choke?

kyle242gt
06-24-2005, 01:43 PM
This was an add-on circuit for X4/X5. Now that I think about it, the fuel pump relay probably already has that choke. :oops: nevermind, I'm a dork. :-P

Unregistered
06-27-2005, 06:58 PM
This was an add-on circuit for X4/X5. Now that I think about it, the fuel pump relay probably already has that choke. :oops: nevermind, I'm a dork. :-P

i have read that aging fuel relays can allow the ECU to get hit with some voltage, but you smart guys would have to explain why this is. saw a faq on jetronic failure somewhere...

as for long drives, there is a guy on ms forum who built ms in an ecu box so he could plug oem ecu in if he got stranded by dead ms (don't volvo people do this ms-in-oem-box, too?). of course, you need to have the other components with you, like air meter and injectrs, but it's cheaper than a second ms and not a big deal to swap in.

a question for yourself would be: do you want to spend the time money energy on a 2nd ms box just for a fairly unlikely contingency? unless there are other, compelling reasons for a 2nd ms, personally, i'd rather plan to put stock stuff back in, in case of failure. besides, crapped out cars on long trips are often catalyst for adventure, folly, and fun. :)

The Aspirator
06-29-2005, 01:43 PM
Well my brother just got stranded by a little problem, so I thought I'd share. Basically he was driving along accelerating when the car just up and cut out. He pulled over and it wouldn't start at all. Checked the engine and found that the upper radiator hose had gotten loose and slipped back off the head about half an inch. It dripped a bit of coolant down that side of the block and onto the distributor. Currently he just has the 3 wires going into the plug, with no rubber cover/boot over top. So the coolant seeped down past the wires and pooled up at the bottom of the dizzy plug, shorting it out.

LUCKILY this didn't cause any damage whatsoever, once he used a paper towel to soak up the coolant it started right up no problems. I guess this could happen with LH also, but the fact that the wiring was exposed was the problem really. I mean the wires weren't exposed, you couldn't see metal cause they're individually heat shrinked, but there was no boot covering all of 'em.

So keep that in mind y'all, cover you stuff up to reduce the chance of a problem.

swedefiend
07-02-2005, 10:22 AM
Well, My MS has been installed for about six months now. I have only had a few problems. All of them have been related to the MSD ignition and it's connection to the battery (yes, even with my super pimp battery connectors).

So, today begins the ultimate test of my install. I will be putting ~700 miles on the MS in as few as four days. If it survives this trip and doesn't give me any problems, then I think I can call this one done...

Keep your fingers crossed for me. I will report back on Wednesday!!!