Megasquirt Timing and Fuel Map Thread

[JGCUSTOM]

Crazy But Working

How do I Insert Picture of Tuning Map


M20B25 Rebuilt (Stock Internals)
-Arp Head Studs 85ft lbs
-Cometic .140 MLS Headgasket
-Backyard Port n Polish

Custom Turbo Manifold (6-2-1)
-Single MVR44mm wastegate

Precision Turbo 6766BB @20psi (240kpa)
-1000cc injector
-Custom Intake Manifold
-Precision 28x15x4 Intercooler
-Stock Coils
-Autozone Sparkplugs

I built it to see how far i can go with a "Stock" M20b25 engine!
So far its running strong!

I trying to learn the timing limits of a m20 engine with stock distributor!
Everyone says high boost low timing? But all my m20s love high timing!
How delayed are the ignition or coil ?

Any info please

Thank You

Instagram:

https://instagram.com/p/BUKV4cQj-Kg/

_Jgcustom
Lajaim92
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[Joegreen02]

Not sure a stock 2.5 with a cam is going to get to 200. Probably closer to upper 160's, low 170's. None of the other modifications you listed aside from exhaust will increase power. Even deleting the clutch fan only showed me .4whp on a DynoJet (yes, less than a half HP), and that could have just been the typical variance from run to run. Best case I have seen with headers vs stock manifolds was 5whp.

Edwardo says 175 at the wheels 200ish to the crank. He got some pretty decent power out of it before and it was having some pretty bad crank sensor issues. I've decided to forgo the second na run anyway. Got a turbo manifold coming. some more mandrel bent pipe in the garage and I have a couple turbos I'm looking at. By the time I get on days off again I'll have everything available to pull with a little boost and put down real numbers worth snapping a picture of lol




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[ForcedFirebird]

If it clears up its back to the dyno to put down closer to 200!

Not sure a stock 2.5 with a cam is going to get to 200. Probably closer to upper 160's, low 170's. None of the other modifications you listed aside from exhaust will increase power. Even deleting the clutch fan only showed me .4whp on a DynoJet (yes, less than a half HP), and that could have just been the typical variance from run to run. Best case I have seen with headers vs stock manifolds was 5whp.

[Joegreen02]

Megasquirt Timing and Fuel Map Thread

No kidding- I know you mentioned early it's "mostly stock", but what all is done to this motor?

So far I have deleted the maf, and have a 3" intake

long tube equal length headers and 2.5" mandrel bent exhaust with magnaflow resonator 53956 and sport muffler 10416.

Febi HD new version rocker arms, and schrick 284 cam.

New Greenish blue timing belt and bmw tensioner is a good one can't recall the brand

Ac and power steering deleted about to do a serpentine belt conversion too

RHD 7.5lbs flywheel and clutch masters clutch

23.5 lb pink top injectors

Walbro 255 pump

GM intake air temp sensor

Square Motorsport e36 tps adapter and bmw e36 tps

Mega squirt 2 now tuned by solani performance of mcallen texas [emoji108]

AKG Motorsport red motor and trans mounts

AKG Motorsport short shifter with AKG DSSR

Clutch fan delete with flex a lite 16" fan and controller

Turner Motorsport coolest mod (nut where fan clutch was)

New bmw coil

IRE 8mm wire set

AEM wide band with controller

New bmw narrow band

Bosch r6 plugs

2.93 lsd medium case with aluminum front mounts and green urethane rear mount

All urethane bushings everywhere

UUC sway bars

H and R race springs on bilstein b8's

Z3 rack with garagistic install kit

Garagistic solid steering coupler

Garagistic strut tower bars and rear shock reinforcement

Condor center vent gauge mount with bosch gauges

Steering wheel from Bulgaria

Deleted all hvac system

Sparco corsa front seats with 4 point harnesses

I guess that's more than the motor there is lots more to it. And more to come. I have the turbo manifold on the way [emoji16]





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[Fraser]

So..... 0.035 gap on the cps and she is revving free as a bird. 6550 no problem. Can't wait to see what it puts down on the dyno next time. [emoji16]


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No kidding- I know you mentioned early it's "mostly stock", but what all is done to this motor?

[Joegreen02]

So..... 0.035 gap on the cps and she is revving free as a bird. 6550 no problem. Can't wait to see what it puts down on the dyno next time. [emoji16]


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[Joegreen02]

there is a soft spark limiter, it will retard timing to a certain amount before a hard limiter. It is supposed to make the "hard" limit less abrupt. Usually the base tune timing pull is 12deg, but I've never seen it prevent the hard limit--so it'll keep pulling until spark and/or fuel cut if you have it enabled.


I really doubt those are 23.8 gph, as that means they are like 1500cc/min injectors...perhaps 23.8lb/hr?

If you don't have dead times for the injectors themselves, leave the dead times alone.

Lol yes 23.8 lb/hr and no I couldn't find dead times. I'll check the soft limiter setting


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[Jaxx_]

there is a soft spark limiter, it will retard timing to a certain amount before a hard limiter. It is supposed to make the "hard" limit less abrupt. Usually the base tune timing pull is 12deg, but I've never seen it prevent the hard limit--so it'll keep pulling until spark and/or fuel cut if you have it enabled.


I really doubt those are 23.8 gph, as that means they are like 1500cc/min injectors...perhaps 23.8lb/hr?

If you don't have dead times for the injectors themselves, leave the dead times alone.

[Joegreen02]

you are hitting the rev limiter. If you look below it says SPK: revlim retard(deg): 2.7. It takes 2.7 degs from your base to get 34.3.

It's a 2 valve head with a little quench... 36-38-40 is probably in the realm of "correct" at WOT after 3k. To know for sure, you need a dyno, of course.



You need to change your required fuel in your general settings after changing injector flow rate. You also should change dead time if you have it available. It's not the end of the world if you don't have it. It's not as important as some people make it out to be

The Rev limiter is set to 6300 though not 5750. I do have dead time available although I don't know what that is or how it should be manipulated only thing I could find on the injectors is they are 23.8 gph. I did reset that and I believe my problem with the cutting out to be the gap on the cps I'm gonna reset it tomorrow morning and I'll report back. If it clears up its back to the dyno to put down closer to 200!


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[Jaxx_]

you are hitting the rev limiter. If you look below it says SPK: revlim retard(deg): 2.7. It takes 2.7 degs from your base to get 34.3.

It's a 2 valve head with a little quench... 36-38-40 is probably in the realm of "correct" at WOT after 3k. To know for sure, you need a dyno, of course.



You need to change your required fuel in your general settings after changing injector flow rate. You also should change dead time if you have it available. It's not the end of the world if you don't have it. It's not as important as some people make it out to be

[Joegreen02]

Megasquirt Timing and Fuel Map Thread

Look at this why is my timing going crazy here? What would cause that?

What is the max spark advance for these m20b25


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[Joegreen02]

What needs to be changed for these injectors?


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[Joegreen02]

Also you can put it on a TS dashboard. Hard to use while driving though.


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I'll try that too. This thing is gonna be a beast once I figure out if I'm going super charged or turbo. I'm still on the fence on that too


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[justinpirie]

Lol I did a log I'll have to look at it and see. I'm learning I'm learning


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Also you can put it on a TS dashboard. Hard to use while driving though.


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[Joegreen02]

Lol I did a log I'll have to look at it and see. I'm learning I'm learning


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