In the datalogs when i go full boost in the higher rpms the boost will jump back and forth between 216kpa down 170-180ish
so i cant get it tuned properly with out it goin to lean
I could richen up where it drops but thats kinda stupid
theres no drop on my boost gauge and i dont feel the car pulsing when it revs out im pretty sure its not a boost leak.

I've tried using the stock restrictor pill in the line, and lowering my map lag but was still having the same issue

is it something with the map sample settings???

I just want to get it back to its original power. I've been having thoughts of putting the chipped ecu with the afc neo back in.

 

As usual when posting about any problem, please attach a log and an msq.

 

hey ken maybe you could take a quick look at why my accel kicks on sometimes without any change in tps

 

I cant get the datalog to upload its 408kb zipped, 3.08mb unzipped
i'll make a quick datalog of a WOT pull tomorrow and post it

 

Accel can happen because of MAPdot too.

Ken

 

heres that log
i fixed that lean spot at 5200rpm
im goin to double check there's no boost leaks tomorrow with the pressure tester

 

seriously, no one has any idea why the mapdot jumps around like that
i've tried tightening down my BOV, to the point i was getting bad comp surge, checked for leaks its nothing mechanical.
I'm pretty disappointed with the megasquirt i've wasted over 2 months f'ing with this POS.
everyday i have to add fuel up top, but its running rich as ****

It's pretty bad when i get better results from a SAFC , atleast i could go WOT with consistancy

 

I tried putting the AFM back on so i could tighten the bov right down without getting bad compressor surge, and if anything it was worse, going from 214kpa to 175 on the map is BS.
. goin super rich to lean to super rich with no indication on the boost gauge obviously its a setting with MS.
how do i make the map sensor less sensitive but still have it respond fast enough to keep up with my turbo
im so fed up with this thing. Im about ready to pull it out and sell it

 

im still having the problem, i noticed when its dropping the mapdot goes from reading positive to negative value. it will jump from like 4500 to -4500

 

you can see the mapdot at the bottom. anyone have any ideas
I dont want to blow my year old engine trying to get this thing to work right.

this one i changed the map sample to 5 deg window every 360 deg map lag was at 80

Is it normal for the map dot to jump from 4500 to -4500. i
ll check my solders on the map sensor and try a different vacuum source

 

Relax man. I have been swamped at work so I have gotten behind with helping people on the forums. Most likely you have a simple configuration issue, or your MAP sensor is connected to a bad place or similar.

In any case, I will have time to help tomorrow.

Ken

 

Step #1 is you need a smaller orifice where you take your pressure signal from.

I would suggest something with a 0.8mm hole. I have been told mig welding tips can come with holes around that size which is an option for you.

If you slow down the pulses MAPdot will be weaker.

I use a screw flow regulator my old boss gave me. It has a restriction in one direction and a tun-able restriction in the other direction.

I have it oriented so that pressure rise is the fixed restriction and the pressure drop is the tuned one. I have it tuned so that idle MAP reading has very little noise when the idle is smooth.

In any case in the future I plan to load a piece of vacuum hose with something with a hole in it about 0.7mm.

Set Throttle enrich to 100% TPS mode, and make the MAPdot threshold the maximum value you can set.

When you get it working it will be worth while

 

Things you have wrong that won't affect your primary issue.

#1 Set your MAPdot to 1000
#2 Make decel fuel amount 100%

Why don't you use secondary injector staging?
Why don't you have overboost cut set at 245kpa. You are playing with fire having that setting the way it is.

1.5bar above ambient can be enough to push the vacuum hose to your wastegate off even when you can't pull it off by hand.

Your spark map is terrible. Taper the values from 100kpa to 200kpa. I would make 100kpa peak timing about 24 degrees and then taper to 10 degrees at 200kpa.

15degrees BTDC is easy to get away with at 150kpa.

I would also revert all the sampling and windowing settings to their defaults. I'm not sure if having dud values there could make it worse.

BTW MAPdot by nature is differentiation which is a noisey process. Control systems use dot aka differential to get fast response however it needs to be known by the tuner that dot/differential is error prone where there is high speed noise on the system. And the higher the frequency of the noise the harder the output will swing.

 

Where is your vacuum source?

Personally I'd recommend disabling MAP-DOT and running TPS-DOT. That's not the cause of your issue, but of course it contribute to the problem right now.

Is your Megasquirt significantly below your intake manifold? Maybe the vacuum hose is full of oil?

 

sorry I was just getting frustrated I wanted to go to the drags for my bday tomorrow

that screenshot was with the stock orifice in the map line.
Im using the staging table for my staged injection

i only had the 3.0.3s firmware, I read last night the mapdot is upgraded in a later firmware so i'll see if the 3.1.0 makes a differance.

decel at 100 would go to rich when it would come on

 

i have it at the back of the intake manifold above the turbo where i had the stock boost sensor hooked up, but its only getting the signal from the one rear primary runner. im goin to try moving it after the TB

its not the accell enrichments im having probelms with i use 100% tps
it jumps from 210-175-180kph messing with the pw and timing and required fuel
i just saw the mapdot jumping from a positive to negative when it happens,

maybe i have a weak 5v source? cuz even my tps drops when it should be at 100%

im goin to try all the stuff i mentioned and then maybe try puting a fuel filter in the map line

 

sorry guys I've spent the majority of June trying different things and reading pages and pages of info trying to get that issue resolved, it was driving me nuts its been 8 months since i got to do a full out pull in my 7, I was having withdrawals hahahaha

I moved the vacuum line to after the TB, and updated the firmware to 3.1.0. and did a 3rd gear pull. and it held nice and solid. must have been to much turbulance from the engine pulses where i had it. i'll redo my vacuum lines tomorrow and add the extra psi back to make sure everything still works, but I think its good now

as for the overboost protection, I've drove the car for over 4 years without any overboost protection. i put little hose clamps on my vacuum lines to my wg actuator. I can hear the differance when my car runs lean or rich

 

Glad to know it worked out. I've also had problems with that vacuum port as well. What I tend to recommend now is tying both of those runners together with a small vacuum manifold and drawing all your vacuum stuff off that manifold. This can be done fairly easily by just tapping the runners for 1/4" NPT and then threading in nipples or AN fittings.

 

Hey Mate,

Thanks for posting up your goodtune.zip. I just checked your settings to fix my own problems after I updated the firmware.

 

hahaha n/p, they're all mostly from Aaron write up, some just altered a bit
my aceel settings are still a bit rich but work decent now.

 

I see now. Never really looked at the megasquirt section of the site since I've been using it since ms1extra had rotary code.

Someone may want to tell Aaron that spark table on his website is 100% terrible. I have a nicer one he can adapt.