Can you look over my tune? 2.9L M20 Turbo

[SLEEPYDUB]

Forcefed, you mentioned the 5* drop from 100 to 120kpa. That's what I have going on here as well. It seems to drive well and transition over well. I have verified my tooth angle so timing numbers are correct. What would you suggest that I do to help smooth that transition? This is on E85 BTW.

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[JGCUSTOM]

Thank You (LowR3V'in) n (ForcedFirebird)

Okay so i readjusted my ignition timing cause I did notice the jumps you mentioned! and its much smoother and dont have to play with the throttle to idle!!
Feels a little lazy on the transition n top end but still good.
Engine temp risen from 175F to now 190F, but the car feel more tamed





[/IMG]

[ForcedFirebird]

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:
_Jgcustom
Lajaim92[IMG][/IMG]

Your timing doesn't need to jump down 5° going from 100kpa (no boost) to 120kpa (3psi boost), and all of your N/A section of the commanded fuel is way too rich. The m20 likes to run in the mid 13's at less than 100kpa, gradually getting richer from 120-240kpa peaking at high 10's or low 11's. For timing, start with a stock table and take out 2° for every 10kpa of boost. Be careful with an MLS gasket and high timing, you will break/burn pistons and not even know you are since the gasket will likely hold more than the pistons.



Also, we don't know where your timing really is unless you used a timing light to verify you are starting at 0. If your trigger offset is -5° off, then you would need that much more timing in your tables to make up for it (we only see half the story with your tables).



Autozone spark plugs don't say much - they sell all the typical brands. I would suggest NGK bpr7es, maybe even a 7 since you are on the stock single coil. What gap are your plugs?

[LowR3V'in]

that is allot of timing but maybe because you're so rich.

on the wot, that's about right i guess. just up it *2 every pull and if it does nothing,
or if you're not sure, then back it down again.
should get you right where you want to be. add *1 after 5k.

using this i went to the dyno and it was on point *24 anymore it lost power,
even though i didn't feel the power loss on the street.

on the driving portions it doesn't look too good. :P

[JGCUSTOM]

Crazy But Working

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[IMG][/IMG]

[e30davie]

Whered you get this tune from? cereal box?

[SGT StudMuffiin]

have you taken any of the opinions given and auctioned on them?



are you still running the same "tune" 6 months later?

I’m on a completely different tune, this one barely even ran


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[e30davie]

have you taken any of the opinions given and auctioned on them?

are you still running the same "tune" 6 months later?

[SGT StudMuffiin]

Bump to get some more opinions


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[citizen_insane]

UPDATE: the head was finally pulled off today, and we discovered that the head cracked even though it has welded coolant jackets. I’m gonna throw in a new head and put it back together, then let my tuner finish the tune and go from there.


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While you're in there try and figure out why the head cracked. I'd suspect the two main causes of this issue would be over temp and/or preignition. Both of those could be caused by poor tuning.

[SGT StudMuffiin]

UPDATE: the head was finally pulled off today, and we discovered that the head cracked even though it has welded coolant jackets. I’m gonna throw in a new head and put it back together, then let my tuner finish the tune and go from there.


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[tschultz]

You haven't really said, but are you trying to identify if his tune was the cause of your blown HG?

Have you spent any time looking at other M20 tunes or trigger wheel settings to understand what people are saying?

[SGT StudMuffiin]

3days and you get that as a result. How much did you pay this "tuner" ?



Maybe I should be a "tuner"....

I’m definitely going to have a talk with him and figure out what is the reason the tune looks like garbage. The thing is, where I live I’m super limited to tuners. I can basically pick from 3 of them, and 2 of them have reputations of blowing many engine on the dyno, and the tuner I went with blew his own trumpet quite a bit, but some of my friends who had their cars tuned from him have had good results so I don’t really know what’s going on


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[SGT StudMuffiin]

So does your car feel pretty slow or what?

Well it doesn’t feel slow or fast. It’s sitting in my garage with a blown head gasket


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[e30davie]

3days and you get that as a result. How much did you pay this "tuner" ?

Maybe I should be a "tuner"....