Boost creep?? hit 15 lbs...... not so good

[fiftytakedowns]

Just got my external welded in, and it's a night and day difference. The car pulls WAY harder, and gets scary fast.

That being said, the car hit 15 lbs today, and I think ive only got a 11 lb spring in there. maybe an 8. Im running a cheap ebay wastegate. which is un-neccessarily large. Im wondering what would cause the car to boost creep like that. should I get a smaller spring? or replace the wastegate?? I dont want to drop the dime on a tial, but If I have too well then I have too.

[fiftytakedowns]

What's up with this map?
Why is the spark all over the place?

[Wh33lhop]

Spark is probably all over the place because RPM reading is all over the place. Just a thought.

[fiftytakedowns]

Spark is probably all over the place because RPM reading is all over the place. Just a thought.

LOL thats what I meant when I said spark.... it'd dictated by rpm... as well as pulse width..

I smoothed it out to a point where the erratic rpm is very intermittent. but it still occurs

heres a post about the wiring....

I can ground the Capacitor to wherever? Is it okay If I were to use two capacitors?
Looks Like I have to re-ground all the wires then.

Do I need to shield the Pin 36 Wire? ( the Tach signal, not the IGN signal)?
The stock MS harness does not have it shielded, but the IGN is sheilded(pin 24 on MS)

RED and whit striped wire is capacitor T'd into the Power Line which is black. That wire then goes to feed the module, and Coilpack

Here is a grounding point right here Attached are the 2 capacitors (one as a spare in case.) the shielding wire of the PIP signal (pin 24), and the ground of the EDIS module (in blue)


VR sensor Wire, and shielding wire going from signal to module, and the other shielding wire in thumb is grounding to chassis



here in my hand is the wires that go to 1, and 3 in EDIS module (pip and SAW) Grey wire goes to number one, and is shielded. shielding goes to that ground with the capacitors, and ground of the EDIS module. Brown wire is unshielded. IF I were to shield the brown wire..... How far back would I want to go into the MS harness? Do I need to shield it at all?


Hope that can display something about my wiring.

I switched between the capacitors, and it didnt make much of a difference... one thing I noticed is that the sparatic RPM signals are usually when the car is cruising. or maintaining part throttle of some sort. I was doing the diagnostic prog of TUnerstudio. and the signal was really steady and idle, but once I gave it gas or something it would be sparratic, then rev up smoothly. the signal shifts are qutie intermittent in when they will appear in the RPM range. Its either consisten 3k or completely random.

[fiftytakedowns]

the MAx boost I hit was 180 KPA, which I think is Ten lbs. my megaquirt read that, but my boost gauge said 15+ psi.... which do I trust?

[nando]

I don't think you should be using a capacitor on the VR signal

one thing that is very important is the shield of the VR sensor wires is properly grounded. also you can try a 10k resistor on the VR+ line.

if you have at least MS2/e 2.1.0 you can also try the noise filtering option. Try just enabling it without changing anything else and see if it works better.

[fiftytakedowns]

I don't think you should be using a capacitor on the VR signal

one thing that is very important is the shield of the VR sensor wires is properly grounded. also you can try a 10k resistor on the VR+ line.

if you have at least MS2/e 2.1.0 you can also try the noise filtering option. Try just enabling it without changing anything else and see if it works better.

-That noise filter option sounds pretty good.

-The capacitor is on the power line to the coilpack not the VR signal.

-If I were to throw a 10k resistor would I cut the wire, and then solder it in place? ====== <resistor>======. would that hinder conductivity of the signal?

Does it matter If I ground the shielding to the block, or Pin 7 of the EDIS diagram?

http://www.megamanual.com/ms2/edis4ew.gif

[nando]

No I think you want to add the 10k resistor at the MS unit itself. I wouldn't cut any wires. It doesn't work for everyone, but it's something to try if you have RPM noise problems.

if the diagram calls for grounding the shield at the EDIS unit, I'd follow that (can't open it for some reason). You can get differing ground planes when you try grounding something like that to the block. the EDIS module itself should be grounded on the block though.

[fiftytakedowns]

No I think you want to add the 10k resistor at the MS unit itself. I wouldn't cut any wires. It doesn't work for everyone, but it's something to try if you have RPM noise problems.

if the diagram calls for grounding the shield at the EDIS unit, I'd follow that (can't open it for some reason). You can get differing ground planes when you try grounding something like that to the block. the EDIS module itself should be grounded on the block though.

1: should I ground the Shield of the VR sensor to the block with the rest of the MS harness? Or attach it to Pin 7 of the EDIS module as per diagram.

2: If The Pre shielded IGN wire from the pre made MS harness (PIP signal, port 1 of EDIS module) is grounded already to Megasquirt, should I still attach it to Pin 7 of EDIS module, or Ground it to the block with the rest of the grounds.?

3 Can I, or should I crimp the wire shieldings together at the end, and then ground them to the block with a larger gauge wire? if I were to attach them both to the block.

4 is it okay if wire shielding is exposed? or should it be insulated?

5 can I wire the sensor grounds to eachother, and then to the location on the block/ MS harness (pin 19)?

6 Does it matter that the SAW wire is unshielded ? the MS premade harness comes with it unshielded . If it does need to be shielded.. how far back does it need to be shielded.

7 Can the capacitor be grounded any location along the power line between the coilpack and the eDIS module, or does it HAVE to be right before the coilpack?... ( I think Iam getting voltage spikes which cause my laptop to crash) Does it matter where the capacitor is grounded? can it share a ground with other wires?[/QUOTE]

Thanks for your patience!

[nando]

1 - ground to pin 7.

2 - I think grounding at the MS is ok. it's just a logic level signal, right?

3 - do not ground them to the block. ground offsets are what you're trying to avoid.

4 - it should probably be insulated, it is from the factory. you don't want it corroding.

5 - ideally, you want all sensors to ground at MS (or wherever they are being read - the EDIS module in the case of your VR sensor). then you would ground MS/EDIS module to the block. this *should* result in cleaner signals and no ground offsets. this is how the factory did it as well.

6 it looks like it should be shielded in that diagram.. it can't hurt. shield it as far as you can.

7 I don't know about the capacitor. I don't think it matters where in the line it's connected, though - just has to have easy access to a solid ground.

[fiftytakedowns]

Thanks nando, your posts have been quite helpful