MicroSquirt.com read only forum (Jan.15,2018)

Alright, new update. I've changed the plugs and revised my afr table.

The studdering seems to have subsided...for now. The dips are still shown in the rpm's though. As I said too, my AFR's are scaring me a bit. They are spikey and a bit on the lean side for running 8 lbs of boost. Im afraid to ...

Another thing worth mentioning is that the wideband readings now seem read different after different drives. After correcting for the pig rich readings, the afr's now are reading an uncomfotable 13:1-14:1. It runs better...but what's it's confusing the hell out of me.

I just replaced the TFI and after doing so, my AFR readings were pig rich. After leaning her out a bit it seams to have gotten better. I'm thinking my tune is on flawed readings. I'm going to relocate my wideband up closer to the turbine and add on a heatsink. Hopefully that will help out a bit.

Try to back of the fuel quite a bit and test it, you may have it so rich the spark energy just isn't enough to ingite the mix and also gives you a wrong afr reading from alot of unburnt fuel.

When I run your log in MLV VE analyzer it changes it quite much in the bins it has values for.


Ahhh ...

Try to go a bit leaner on the fuel in the affected area and also get new plugs, plugs seem to be short lived when having problem with weak spark which I feel you have problems with.

What lambda do you use?

I can...but I'm afraid there could be an underlying problem other than the tune. I'm also ...

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Or not!!! It's back with a vengence. I need some input on the following datalogs please!!!

Also, more symptoms of the studder are jerking and bucking at wot in boost. This is really getting quite annoying...any and all help would be appreciated!

From what I see in your datalog, I would suspect ignition.The datalog clearly shows lean AFR spikes when the engine stutters and this usually indicates that you have missed firing the fuel in 1 or more cylinders.What kind of ignition are you using?

Brad J.

You know...this is my #1 suspicion. My ...

And here is another datalog of a 1-4 gear wot run...and yes, the studder is still alive and kicking.

I am running msns-e 029q with megatune v2.25 on a v3 main board.


The car…my 5.0l twin turbo mustang with mods as seen in my sig below.

Well...I've seemed to have develped a studddddder under boost. It's not really apparant under lower rpm/boost levels. The strange thing is this morning when I ...