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Old 05-18-2012, 05:33 PM   #241
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Makes me wish I built my own rather than ordering the MS2 v3. Still waiting after almost 2 months; darn delays. :(
Perfect time to cancel your order.
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Old 05-18-2012, 06:44 PM   #242
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Smaller return than feed is an awesome way to get fuel pressure fluctuations at idle and low RPM which will wreak havoc on the driveability of the car. The return line needs to be the same size as the feed line. There is no reason to downsize it, and every reason not to.

Can you please explain why the smaller fuel return would cause fluctuations?
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Old 05-18-2012, 08:36 PM   #243
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This is my guess:

Think of it as a garden hose with four even leaks in it. Those leaks are your "injectors", and the open end is the "return line". If you restrict the open end of the hose, more pressure goes through the leaks. If it's free flowing, they stay constant.

So, my guess is, under different fuel loads, the return line is sometimes a restriction, but sometimes it's not.

How wrong am I?
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Old 05-18-2012, 10:21 PM   #244
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This is my guess:

Think of it as a garden hose with four even leaks in it. Those leaks are your "injectors", and the open end is the "return line". If you restrict the open end of the hose, more pressure goes through the leaks. If it's free flowing, they stay constant.

So, my guess is, under different fuel loads, the return line is sometimes a restriction, but sometimes it's not.

How wrong am I?
If this was the case, then the return line should be bigger.
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Old 05-19-2012, 10:08 AM   #245
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it probably should, so it doesn't build pressure.
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Old 05-20-2012, 03:36 PM   #246
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first track day was a success.

Shenandoah circuit is absolutely insane and I loved it. Nothing broke except YET ANOTHER COP. It started misfiring a little bit under load. I had a spare - swapped it in and everything was gravy.

Oil temp never went above 200-210F. 80F+ ambient. At about 10psi. I don't think that's normal....? But it's a pretty tight track.




Brakes were good. Power was good. Tires were awesome.
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Old 05-20-2012, 03:48 PM   #247
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Time to upgrade to LS coils it seems like.
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Old 05-20-2012, 03:58 PM   #248
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Time to upgrade to LS coils it seems like.
Yeah COPs suck. LS coils comig soon. I also have oil in my intake manifold, so catch can is long overdue.

Ay least nothing melted and my crank pulley stayed put
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Old 05-20-2012, 04:03 PM   #249
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I will get you the part number for the ls2 coils I am using. Then go spend $150 at FM for their bracket and spark plug wires. It is well worth the money for the FM parts and makes things much cleaner.

Check my build thread later in the week for my new catch can setup. Hopefully it will be the last time I ever fuxor with it.
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Old 05-20-2012, 04:10 PM   #250
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Have you checked your spark output circuit? Could that somehow be damaging your COPs? I've never heard of them blowing so often. Once in a while, yes, but not like this. Surely if a new one blew every 1000 miles (has it even been that long?) People like Sav, myself, Hustler, and all the other turbo track junkies running them would be having issues.
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Old 05-20-2012, 04:26 PM   #251
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Have you checked your spark output circuit? Could that somehow be damaging your COPs? I've never heard of them blowing so often. Once in a while, yes, but not like this. Surely if a new one blew every 1000 miles (has it even been that long?) People like Sav, myself, Hustler, and all the other turbo track junkies running them would be having issues.
He is using the spark outputs on the MS3X, so I highly doubt it is the spark output circuit.
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Old 05-20-2012, 05:14 PM   #252
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Quote:
Originally Posted by shuiend View Post
I will get you the part number for the ls2 coils I am using. Then go spend $150 at FM for their bracket and spark plug wires. It is well worth the money for the FM parts and makes things much cleaner.

Check my build thread later in the week for my new catch can setup. Hopefully it will be the last time I ever fuxor with it.
I was thinking of getting coils from a junkyard, making my own bracket (with a bending brake) and wires.. not sure. I don't see the coil bracket on FM site, do I have to call them? $150 for bracket and wires sounds cheap by FM standards.


Quote:
Originally Posted by curly View Post
Have you checked your spark output circuit? Could that somehow be damaging your COPs? I've never heard of them blowing so often. Once in a while, yes, but not like this. Surely if a new one blew every 1000 miles (has it even been that long?) People like Sav, myself, Hustler, and all the other turbo track junkies running them would be having issues.
I ran on exact same COP/ECU setup for like 12k miles while N/A. I just started using MS3. In the COPs defense, the ones that died are the original ones I bought used ages ago. The new replacement ones are all going strong. In total, 3 of them died (so right now I'm running on 1 "original" and 3 replacements).
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Old 05-20-2012, 05:39 PM   #253
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I was thinking of getting coils from a junkyard, making my own bracket (with a bending brake) and wires.. not sure. I don't see the coil bracket on FM site, do I have to call them? $150 for bracket and wires sounds cheap by FM standards.
Coils are $22 new here on ebay, there is absolutely no reason to buy used ones. The bracket and wires are not listed on the FM site. You need to call to order them. The bracket is about $45 and the wires are around $90. You can also buy the pigtails on ebay, or you could ask FM how much they are from them. When you call FM ask for Brandon, he was extremely helpful with all my questions and then ordering.
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Old 05-20-2012, 06:42 PM   #254
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Thts not the ballerest ls coil lars

Also fms kit is gay. Having to do a ss braid line for vvt oil feed is stupid.
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Old 05-20-2012, 07:05 PM   #255
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Thts not the ballerest ls coil lars

Also fms kit is gay. Having to do a ss braid line for vvt oil feed is stupid.
Soviet does not have VVT so that point does not matter to him. Also I could care less about "ballerest" ls coils. The ones that are good enough on a vette are more then good enough on the miata.
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Old 05-20-2012, 11:15 PM   #256
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Soviet does not have VVT so that point does not matter to him. Also I could care less about "ballerest" ls coils. The ones that are good enough on a vette are more then good enough on the miata.
I don't see the logic in "good enough for a corvette". It's a lot easier to spark @ 100kPa than 300kPa. Skim over this thread -> http://ls1tech.com/forums/forced-ind...ations-fi.html

The ballerest coils aren't much more expenisve, anyways - http://www.ebay.com/itm/NEW-IGNITION...ht_3179wt_1396

And you can get 8 of them for $160
http://www.ebay.com/itm/New-Ignition...#ht_500wt_1396

I'm still probably going to go the junkyard route, because that's how I roll. Also with my COPs - only one coil genuinely died. Like, not firing at idle dead. The other two just started misfiring under load. I think more dwell could make them work. I have it set to 2.2ms in TunerStudio.
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Old 05-20-2012, 11:32 PM   #257
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many boosted applications use standard run-of-the-mill cops. subarus and evos, all the way up to 30psi. if yours are dying they're either crappy/old or you're destroying them some how.

I don't see the point in re-inventing the wheel when it works for everyone else.
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Old 05-20-2012, 11:36 PM   #258
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leaning towards crappy/old. do subarus/evos also use wasted spark?
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Old 05-20-2012, 11:49 PM   #259
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Quote:
Originally Posted by shuiend View Post
Soviet does not have VVT so that point does not matter to him. Also I could care less about "ballerest" ls coils. The ones that are good enough on a vette are more then good enough on the miata.
Wrong. Do the math.

Vette makes aroud 60hp/L on more cylinders.

Soviet makes around 200hp/L on fewer cylinders.

That means there is WAY more fuel in soviets cylinder vs vette cylinder.

Hence, sovient needs more spark than a vette
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Old 05-21-2012, 12:39 AM   #260
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Quote:
Originally Posted by soviet View Post
I'm still probably going to go the junkyard route, because that's how I roll. Also with my COPs - only one coil genuinely died. Like, not firing at idle dead. The other two just started misfiring under load. I think more dwell could make them work. I have it set to 2.2ms in TunerStudio.
I highly doubt the junkyard will be cheaper then new. Every yard I checked at were quoting me more then the cost of new ones. Then you factor in the amount of time you have to spend driving there and then searching around for the coils.

I have used both the truck ls coils and the ones from the vette. I have had less problems with the ones from the vette at up the 17psi.
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