Megasquirt Timing and Fuel Map Thread

[justinpirie]

Lots of trial and error. Well and ignition timing, but thats a whole other story.

This!

Buy the best version of Tuner Studio, too.



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[e30davie]

If you set your AFR target table properly I found the auto tune in tuner studio to be awesome. Still requires fine tuning and you have to keep an eye on it, but you just turn it on and start driving around. Within about 30mins my brother and I had my car "tuned" to start, drive, idle quite good with reasonable AFRs across the board.

The difficulty i think in DIY tuning comes when trying to sort out the air temp correction and acceleration enrichment. Lots of trial and error. Well and ignition timing, but thats a whole other story.

[Joegreen02]

PM me. I'm happy to get you up and running so you're not spending so much with a tuner. If you are are seeing 10:1 AFRs but it's running, you're half way there

Well I'm currently in Houston at a rig managers meeting. I'll be home Friday. It does run.and not bad but 10's are rich as fuhh and I'm sure I'll see good results on the dyno. The guys got great reviews


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[Jaxx_]

Know a good one? I'm talking to a couple but I'm reluctant to pull the trigger gonna send a guy the maps I have developed that actually run decent and through a little coin to see what happens

PM me. I'm happy to get you up and running so you're not spending so much with a tuner. If you are are seeing 10:1 AFRs but it's running, you're half way there

[Joegreen02]

Well I'm taking her to mission texas Friday to have it dyno tuned NA for the moment until I decide if I want to slap this SC on it or not. We will see how everything goes with the na tune first[emoji2369]


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[justinpirie]

Know a good one? I'm talking to a couple but I'm reluctant to pull the trigger gonna send a guy the maps I have developed that actually run decent and through a little coin to see what happens


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+1 on spending money on a tuner. You should use one that’s familiar with MS otherwise it could be a waste of money. There are remote tuners but you can’t tune advance without a dyno.

MS is powerful but also a PITA.


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[Joegreen02]

Megasquirt is much more capable than a chip. Spend that money on a tuner that knows what they're doing and you'll enjoy megasquirt a lot more. Or learn to tune it yourself

Know a good one? I'm talking to a couple but I'm reluctant to pull the trigger gonna send a guy the maps I have developed that actually run decent and through a little coin to see what happens


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[Jaxx_]

Yeah I've been running the 284 on stock injectors for nearly a year running great. Almost regret going to MS actually. I thought I would get more out of it out of the box. I mean Turner motor sports makes a chip that drops in and performs great. Thinking I'll go back to that and leave it.

Megasquirt is much more capable than a chip. Spend that money on a tuner that knows what they're doing and you'll enjoy megasquirt a lot more. Or learn to tune it yourself

[Joegreen02]

Yeah I've been running the 284 on stock injectors for nearly a year running great. Almost regret going to MS actually. I thought I would get more out of it out of the box. I mean Turner motor sports makes a chip that drops in and performs great. Thinking I'll go back to that and leave it.


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[ForcedFirebird]

Hello all. I am finally running MS2 the pnp version. Currently running stock injectors 284 cam. I've successfully deleted the vane and am running on m50 tps. I would like to add the m50 injectors but have no idea what needs to be done to make this happen correctly.

My afrs are really low around 10 at wot back to 16ish off the throttle, idle is irratic at best, and my timing map that comes from diyautotune seems to be way off. I'm miss firing in the upper rpms and popping in the intake coming off idle.

Currently making some changes using a few maps I have found here and there from several basically stock vehicles. The plan is to supercharge the car once I learn to tune it. Any help is greatly appreciated I will send what ever is needed. Thanks!


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Popping is probably because you are loading the engine up with fuel and it is igniting in your exhaust. The maps that come on the MS is just a base.

Might as well add the injectors now because it sounds like your car is not tuned at all as it is. They drop right in.

17lb injectors might not be enough for a 284 cam.

Stock injectors have no issue with a 284 cam, or even our 9.7:1 2.7 stroker making 180whp - a stock m20b25 with a cam is likely making much less.

[Digitalwave]

Might as well add the injectors now because it sounds like your car is not tuned at all as it is. They drop right in.

17lb injectors might not be enough for a 284 cam.

[Joegreen02]

Hello all. I am finally running MS2 the pnp version. Currently running stock injectors 284 cam. I've successfully deleted the vane and am running on m50 tps. I would like to add the m50 injectors but have no idea what needs to be done to make this happen correctly.

My afrs are really low around 10 at wot back to 16ish off the throttle, idle is irratic at best, and my timing map that comes from diyautotune seems to be way off. I'm miss firing in the upper rpms and popping in the intake coming off idle.

Currently making some changes using a few maps I have found here and there from several basically stock vehicles. The plan is to supercharge the car once I learn to tune it. Any help is greatly appreciated I will send what ever is needed. Thanks!


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[Jaxx_]

Just so im clear as this is basically brand new to me, Does the EGO control always revert back to the target AFR table even if it is not incorporated. If not, what is it referencing to make adjustments?

You got it. The AFR table is used for both incorporate AFR target and EGO correction

[turbski]

Just so im clear as this is basically brand new to me, Does the EGO control always revert back to the target AFR table even if it is not incorporated. If not, what is it referencing to make adjustments?

[turbski]

Ok, its all starting to make more sense on how those table interact when it is enabled. Ill make sure I turn it back off. For the time being I am going to focus on some minor mechanical stuff and hopefully save up for another dyno session later in the summer. I don't want to lean it out and blow it up.
Not to mention piston rings need attention

This weekend is looking like decent weather up here so I will hopefully get another log to post.

@Forcedfirebird It also makes more sense to be in the power range its in at 12-13psi than it does at 8psi